Ändra sökning
Avgränsa sökresultatet
1234567 1 - 50 av 1687
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    A Asif, Farazee M
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Circular Manufacturing Systems: A development framework with analysis methods and tools for implementation2017Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The society today lives on the philosophy of ‘take-make-use-dispose.’ In the long run, this is not sustainable as the natural resources and the waste carrying capacity of the earth are limited. Therefore, it is essential to reduce dependency on the natural resources by decoupling the growth from the consumption. In this venture, both the society and the manufacturing industry have a vital role to play. The society needs to shift towards Circular Economy that rests upon the philosophy of ‘take-make-use-reuse’ and the manufacturing industry has to be a major stakeholder in this shift. Despite being proven to be both economically and environmentally beneficial, successful examples of circular systems are few today. This is primarily due to two reasons; firstly, there is a lack of systemic and systematic approach to guide industries and secondly, there is a lack of analysis methods and tools that are capable of assessing different aspects of circular manufacturing systems. Taking on to these challenges, the objective of this research is to bring forward a framework with methods and decision support tools that are essential to implement circular manufacturing systems. The initial conceptual framework with the systemic approach is developed based on extensive review and analysis of research, which is further adapted for industrial implementation. Systematic analysis methods, decision support and implementation tools are developed to facilitate this adaptation. This development has been supported by four cases from diverse manufacturing sectors. Behind each decision support tool, there are analysis methods built upon mainly system dynamics principles. These tools are based on simulation platforms called Stella and Anylogic. Among other things, these tools are capable of assessing the performance of closed-loop supply chains, consequences of resource scarcity, potential gains from resource conservation and overall economic and environmental performance of circular manufacturing systems.

  • 2.
    A Asif, Farazee M
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Rashid, Amir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Bianchi, Carmine
    University of Palermo (ITALY) Faculty of Political Sciences - Department of International Studies .
    Nicolescu, Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Performance analysis of the closed loop supply chain2012Ingår i: Journal of Remanufacturing, ISSN 2210-4690, Vol. 2, nr 4Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose

    The question of resource scarcity and emerging pressure of environmental legislations has brought a new challenge for the manufacturing industry. On the one hand, there is a huge population that demands a large quantity of commodities; on the other hand, these demands have to be met by minimum resources and pollution. Resource conservative manufacturing (ResCoM) is a proposed holistic concept to manage these challenges. The successful implementation of this concept requires cross functional collaboration among relevant fields, and among them, closed loop supply chain is an essential domain. The paper aims to highlight some misconceptions concerning the closed loop supply chain, to discuss different challenges, and in addition, to show how the proposed concept deals with those challenges through analysis of key performance indicators (KPI).

    Methods

    The work presented in this paper is mainly based on the literature review. The analysis of performance of the closed loop supply chain is done using system dynamics, and the Stella software has been used to do the simulation. Findings The results of the simulation depict that in ResCoM; the performance of the closed loop supply chain is much enhanced in terms of supply, demand, and other uncertainties involved. The results may particularly be interesting for industries involved in remanufacturing, researchers in the field of closed loop supply chain, and other relevant areas. Originality The paper presented a novel research concept called ResCoM which is supported by system dynamics models of the closed loop supply chain to demonstrate the behavior of KPI in the closed loop supply chain.

  • 3.
    A Österman, Sami
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Kumar, Shirish
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Vattenskärning: Teknologin och dess tillämpningsområden2010Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Vattenskärning anses generellt vara en mångsidig bearbetningsteknik med en mängd tillämpningsområden. Ren vattenskärning gör det möjligt att skära i mjuka material som gummi, medan tillsatt abrasivmedel tillåter skärning av bland annat stål och keramik. Skärningen lämnar inga restspänningar eller någon värmepåverkan i materialet. Dessutom blir ytfinheten så bra att man ofta slipper efterbehandling. Processen skapar inte heller några farliga gaser och är relativt miljövänlig. Syftet med detta arbete har varit att undersöka vattenskärningstekniken, dess nuvarande samt nya tillämpningsområden. Målet har även varit att jämföra tekniken med alternativa bearbetningsmetoder för att klargöra för‐ och nackdelar mellan dessa. Detta gjordes i syfte för att undersöka vilken teknik som är lämpligast att använda beroende på egenskaper såsom material, materialtjocklek och storlek av tillverkad serie. Arbetet har skrivits från Sverige och Frankrike och därmed har man valt att undersöka ifall användningsområdena hos vattenskärning skiljer sig mellan de två länderna. För att uppnå syftet valdes tre frågeställningar för att besvara hur man utökar tillämpningsområdet för vattenskärning, vilka för‐ respektive nackdelar vattenskärning har jämfört med andra skärmetoder och hur tillämpningsområdena är annorlunda mellan Frankrike och Sverige. De huvudsakliga informationskällorna för arbetet har varit intervjuer med tillverkande företag som använder sig av vattenskärning, leverantörer av vattenskärningsmaskiner och forskningsinstitut. Teoretisk komplettering har skett i form av informationssamling från litteratur och vetenskapliga artiklar. Valda primärkällor är företagshemsidor hos aktörer inom bearbetningsindustrin. Rapporten visar att vattenskärningstekniken är applicerbar inom ett flertal industrier och att tillämpningsområdena skiljer sig mellan Frankrike och Sverige; i Frankrike används vattenskärning främst inom livsmedelsindustrin, medan den är mer utbredd inom verkstadsindustrin i Sverige. Aktörer på den svenska marknaden är skeptiska till användning av vattentryck på över 400 MPa, trots att det tyder på många fördelar. Den huvudsakliga begränsningen hos vattenskärning är tjockleken hos materialet. Vid skärning av stål över 30 mm kan strålen fördröjas och resultera i en ickeprecis skärning, ett problem som löses genom att ändra skärparametrar såsom skärhastighet eller genom snedställning av skärmunstycket. Efter en utvärdering av plasma‐, laser‐ och vattenskärning, kan man konstatera att ingen metod är direkt konkurrerande med en annan, då varje teknik lämpar sig bäst inom sitt respektive användningsområde. Teknikerna kompletterar snarare än konkurrerar med varandra.

  • 4.
    Abdoli, Shiva
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    A holistic machining line behavior modeling using Finite State Machines2014Självständigt arbete på avancerad nivå (masterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Energy consumption of turning and milling operations are analyzed in this thesis profoundly. It is aimed to be able to employ analysis results in real production floors. So it is tried to investigate on most effective parameters on machine tool energy consumptions which are changeable in production floors. Due to existing limitations in predesigned manufacturing lines, cutting depth, feed rate and spindle speed, are chosen to analyze their effects on machine tools energy consumption. All other influencing parameters are presumed constant during research. Evaluating machine tools energy consumption shows increasing machining factors values reduces energy consumption in machining operation. Scrutinizing machining factors effect on energy consumption revealed that, increasing one machining factor when two other factors have constant low or constant high values has different effect on energy consumption. The main contribution of this research is proposing a mathematical model, based on material removal rate and machining time for estimating machine tools energy consumption. In addition, a methodology to find machine energy consumption profile based on MRR in a particular operation is proposed too. This enables to find critical breakpoints of MRR for energy consumption in machining operations. Subsidiary effect of increasing Machining factors, on machine energy consumption is analyzed too. To obtain integrative conclusion regarding the effect of machining factors on energy consumption, their influence should be studied in a production system, for long term. In addition machines experience different states with different profile of energy consumption. So energy consumption of machine tools in all states is considered as product associated energy consumption. These targets are achieved by modeling a production line and simulate it for long time. The results indicates for system energy efficiency, it worth’s to increase machining factors even if tool life and consequently machine utilization reduce. Effect of production planning such as batch mode production from energy consumption perspective in production system is evaluated. The results exhibit consistency between tool life, machine idle energy consumption and optimum batch size. The accomplishments can greatly help process planner to achieve optimum production system configuration to enhance energy efficiency.

  • 5.
    Abdoli, Shiva
    et al.
    KTH.
    Semere Tesfamariam, Daniel
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Investigation on Machine Tools Energy Consumptions2014Ingår i: International Journal of Mechanical, Aerospace, Industrial and Mechatronics Engineering, Vol. 8, nr 6, s. 1136-1143Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Several researches have been conducted to study consumption of energy in cutting process. Most of these researches are focusing to measure the consumption and propose consumption reduction methods. In this work, the relation between the cutting parameters and the consumption is investigated in order to establish a generalized energy consumption model that can be used for process and production planning in real production lines. Using the generalized model, the process planning will be carried out by taking into account the energy as a function of the selected process parameters. Similarly, the generalized model can be used in production planning to select the right operational parameters like batch sizes, routing, buffer size, etc. in a production line. The description and derivation of the model as well as a case study are given in this paper to illustrate the applicability and validity of the model.

  • 6.
    Abdollahi, Arsam
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Misstags reducering vid internationell order: En utredande rapport om Eaton Corporation i Hengelo Nederländerna och GE Healthcare i Uppsala Sveriges åtgärder för misstags reducering på Front Office2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Rapporten utreder de speciella karaktärsdragen en kundanpassad produktion har på företagen Eaton Corporation, Hengelo i Nederländerna och Ge Healthcare, Uppsala i Sverige. En djupgående utredning av vad företagen i fråga gör för att reducera misstag vid internationell order. Alltså det som sker från att säljavdelningen får kontakt med kunden till att Projektledare/orderhanterare får beställningen. Fallgroparna vid internationell order som tas upp är t.ex.: kunskapsgap från säljsidan, inga standardiserade dokument för order, skräddarsydda lösningar utan moduler i ERP systemet, ERP system som inte uppdateras systematiskt, kundanpassade produkter, budgeteringsmall beroende på ERP system och vilket land budgetering sker i, restriktioner i ERP systemet, kommunikationsprotokoll mellan berörda avdelningar, integrationen mellan de berörda avdelningarna, kommunikation mellan de berörda avdelningarna och kundens inblandning i projektet. Det som syns genom studien är att företagen är fullt medvetna om att det sker misstag vid Front Office men väljer att inte kvantifiera eller analysera sina misstag. Företagen väljer istället att komma på andra lösningar som att sätta in nya procedurer och protokoll som har syfte att minska misstagen. Fast detta görs utan någon utredning av vad som är källan till misstagen eller vetskap om hur många misstag som görs eller vilka som är de mest kritiska. Som avslutning görs en analys över företagens tillvägagångssätt för att reducera misstagen samt rekommendationer för vad som bör göras ytterligare för att minska misstagen.

  • 7.
    Abdullah Asif, Farazee M.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Information requirements and management for service based business models2014Ingår i: Swedish Production Symposium, 2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    Anticipated scarcity of natural resources and concern for the sustainable development forcing manufacturing industries to emphasise on conservation of resources on one hand. On the other hand high competition in the manufacturing industry is forcing companies to look for innovative value propositions. Service based business models are emerging business solutions that fulfil the functional needs of customers. Such business approach demands extensive and sophisticated information collection, sharing and management systems. However, there are evidences of knowledge gap when it comes to defining information requirements, information management and sharing systems needed to adopt such business models. The objective of this paper is to provide an overview of research done in the area of service based business models in terms of information management and communication systems. The paper also includes result of two case studies done in two different manufacturing companies with the purposes to understand information requirements to adopt service based business models.

  • 8.
    Abdullah Asif, Farazee Mohammad
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Resource Conservative Manufacturing: New Generation of Manufacturing2011Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The question of resource scarcity and emerging pressure of environmentallegislations have put the manufacturing industry with a new challenge. On theone side, there is a huge population that demands a large quantity ofcommodities, on the other side, these demands have to be met by minimumresources and with permissible pollution that the earth’s ecosystem can handle.In this situation, technologic breakthrough that can offer alternative resourceshas become essential. Unfortunately, breakthroughs do not follow any rule ofthumb and while waiting for a miracle, the manufacturing industry has to findways to conserve resources. Within this research the anatomy of a large body ofknowledge has been performed to find the best available practices for resourceconservation. Critical review of the research revealed that none of the availablesolutions are compatible with the level of resource conservation desired by themanufacturing industry or by society. It has also been discovered that a largegap exists between the solutions perceived by the scientists and theapplicability of those solutions. Through careful evaluation of the state-of-theart,the research presented in this thesis introduced a solution of maximizingresource conservation i.e., material, energy and value added, as used inmanufacturing. The solutions emerged from the novel concept named asResource Conservative Manufacturing, which is built upon the concept ofMultiple Lifecycle of product. Unlike other research work, the researchdocumented in this thesis started with the identification of the problem andfrom which a ‘wish to do’ list was drawn. The seriousness of the problem andpotential of adopting the proposed concept has been justified with concreteinformation. A great number of arguments have been presented to show theexisting gaps in the research and from that, a set of solutions to conserveresources has been proposed. Finally, one of the prime hypotheses concerningclosed loop supply chain has been validated through the system dynamicsmodeling and simulation.

  • 9.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Lieder, Michael
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Rashid, Amir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Multi-method simulation based tool to evaluate economic and environmental performance of circular product systems2016Ingår i: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 139, s. 1261-1281Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose: The transition from linear to circular product systems is a big step for any organization. This may require an organization to change the way it does business, designs product and manages supply chain. As these three areas are interdependent, bringing change in one area will influence the others, for instance, changing the business model from conventional sales to leasing will demand changes in both product design and the supply chain. At the same time, it is essential for an organization to anticipate the economic and environmental impact of all changes before it may decide to implement the circular product systems. However, there is no tool available today that can assess economic and environmental performance of circular product systems. The purpose of this research is to develop a multi-method simulation based tool that can help to evaluate economic and environmental performance of circular product systems. Method: The conceptual models that are used to develop the tool have been formulated based on review of the state-of-the-art research. System Dynamics (SD) and Agent Based (AB) principles have been used to create the simulation model which has been implemented in Anylogic software platform. Originality: This research presents the first multi-method simulation based tool that can evaluate economic and environmental performance of circular product systems. Findings: Multi-method simulation technique is useful in designing dynamic simulation model that takes into consideration mutual interactions among critical factors of business model, product design and supply chain. It also allows predicting system's behaviour and its influence on the economic and environmental performance of circular product systems.

  • 10.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Nicolescu, Cornel Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Minimizing Uncertainty Involved in Designing the Closed-loop Supply Network for Multiple-lifecycle of Products2010Ingår i: Annals Of DAAAM for 2010 & Proceedings of 21st DAAAM Symposium: Intelligent Manufacturing and Automation / [ed] Branko Katalinic, Zadar: DAAAM International , 2010, s. 1055-1056Konferensbidrag (Refereegranskat)
    Abstract [en]

    To ensure multiple-lifecycle of products through remanufacturing intervention requires a well-functioning closed-loop supply network. Generally, the unpredictability of quantity, timing and quality (physical/functional) of the returned products and demand fluctuation of the remanufactured products are the main sources of uncertainty of closed-loop supply network. To some extent, efficient recollection strategies and separate distribution channels for remanufactured products can minimize the uncertainty. Nevertheless, efficient recollection does not necessarily close the loop if the recovered products do not enter into the main stream of the supply network. Beside, products that are distributed through separate channels create an open loop. Thus, the problem of uncertainty remains unsolved. The aim of this paper is to propose solutions to minimize the uncertainty involved in designing a well-functioning closed-loop supply network using the system dynamics principle and tool.

  • 11.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Rashid, Amir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Bianchi, C.
    Nicolescu, Cornel Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    System dynamics models for decision making in product multiple lifecycles2015Ingår i: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 101, s. 20-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The main drivers for adopting product multiple lifecycles are to gain ecological and economic advantages. However, in most of the cases it is not straight forward to estimate the potential ecological and economic gain that may result from adopting product multiple lifecycles. Even though many researchers have concluded that product multiple lifecycles result in gain, there are examples which indicate that the gain is often marginal or even none in many cases. The purpose of this research is to develop system dynamics models that can assist decision makers in assessing and analysing the potential gain of product multiple lifecycles considering the dynamics of material scarcity. The foundation of the research presented in this paper is laid based on literature review. System dynamics principles have been used for modelling and simulations have been done on Stella iThink platform. The data used in the models have been extracted from different reports published by World Steel Association and U.S. Geological Survey. Some of the data have been assumed based on expert estimation. The data on iron ore reserves, iron and steel productions and consumptions have been used in the models. This research presents the first system dynamics model for decision making in product multiple lifecycles which takes into consideration the dynamics of material scarcity. Physical unavailability and price of material are the two main factors that would drive product multiple lifecycles approach and more sustainable decisions can be made if it is done by taking holistic system approach over longer time horizon. For an enterprise it is perhaps not attractive to conserve a particular type of material through product multiple lifecycles approach which is naturally abundant but extremely important if the material becomes critical. An enterprise could through engineering, proper business model and marketing may increase the share of multiple lifecycle products which eventually would help the enterprise to reduce its dependency on critical materials.

  • 12.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Roci, Malvina
    KTH.
    Lieder, Michael
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Produktionssystem.
    Rashid, Amir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Produktionssystem.
    Štimulak, M.
    Halvordsson, E.
    De Bruijckere, R.
    A practical ICT framework for transition to circular manufacturing systems2018Ingår i: Procedia CIRP, Elsevier, 2018, s. 598-602Konferensbidrag (Refereegranskat)
    Abstract [en]

    The transition towards a circular economy has become important. Manufacturing industry being a major stakeholder in this transition has started exploring the potential of this transition and challenges in implementation. Ambitious companies such as Gorenje d.d. has taken the circular economy transition seriously and aims to become a pioneer in implementing circular manufacturing systems. One vital step in this transition is the business model shift from the linear (sales model) to a circular model such as 'product as a service'. This brings new challenges to Original Equipment Manufacturers (OEMs) that have never been experienced in their conventional businesses. One of the challenges is to establish an information communication and technology (ICT) infrastructure that enables information management and sharing as well as establishes a real-time communication between relevant stakeholders. Outlining such an ICT infrastructure is the objective of this paper.

  • 13.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Semere, Daniel Tesfamariam
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Nicolescu, Cornel Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Haumann, M.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    METHODS ANALYSIS OF REMANUFACTURING OPTIONS FOR REPEATED LIFECYCLE OF STARTERS AND ALTERNATORS2010Ingår i: 7th International DAAAM Baltic Conference"INDUSTRIAL ENGINEERING"22-24 April 2010, Tallinn, Estonia / [ed] R. Kyttner, Estonia: Tallinn University of Technology , 2010, s. 340-345Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Design for Repeatedly Utilization (DFRU) is a proposed conceptto be used in the product realizationprocess to ensure optimum useable life (forinstance in terms of economy, resourceusage, environmental impact etc.) ofproducts or parts of products enablingmultiple lifecycle. In the DFRU approachproducts are restored as new like productsthrough remanufacturing processes. Theterm remanufacturing has been interpreteddifferently by different researchers and theindustries that are involved inremanufacturing business use differentapproaches to remanufacture theirproducts. In this paper the starter motorand alternator of automotives has beenused to demonstrate the novel concepts.The purpose of this paper is to expresswhat remanufacturing means in ourconcept, model their major lifecycleaspects and create a simulation modelfrom it. This is a preliminary work towardsdefining and specifying the processes,methods and design properties in DFRU.The work will be further extended to aholistic business model which can facilitateDFRU approach in an efficient way. Infuture the model will be developed andadopted to create new models for otherproducts appropriate for remanufacturingand eventually DFRU.

  • 14. Abele, Eberhard
    et al.
    Chryssolouris, George
    Sihn, Wilfried
    Metternich, Joachim
    ElMaraghy, Hoda
    Seliger, Guenther
    Franzén Sivard, Gunilla
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    ElMaraghy, Waguih
    Hummel, Vera
    Tisch, Michael
    Seifermann, Stefan
    Learning factories for future oriented research and education in manufacturing2017Ingår i: CIRP annals, ISSN 0007-8506, E-ISSN 1726-0604, Vol. 66, nr 2, s. 803-826Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Learning factories present a promising environment for education, training and research, especially in manufacturing related areas which are a main driver for wealth creation in any nation. While numerous learning factories have been built in industry and academia in the last decades, a comprehensive scientific overview of the topic is still missing. This paper intends to close this gap by establishing the state of the art of learning factories. The motivations, historic background, and the didactic foundations of learning factories are outlined. Definitions of the term learning factory and the corresponding morphological model are provided. An overview of existing learning factory approaches in industry and academia is provided, showing the broad range of different applications and varying contents. The state of the art of learning factories curricula design and their use to enhance learning and research as well as potentials and limitations are presented. Conclusions and an outlook on further research priorities are offered. (C) 2017 Published by Elsevier Ltd on behalf of CIRP.

  • 15.
    ABOUD, STEPHANIE
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    AL MANDLAWI, LINA
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Vilken påverkan har stora readagar på produktionen inom tillverkande företag?2018Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Stora readagar som Black Friday och Cyber Monday är idag utbredda och etablerade företeelser runt om i världen. Under dessa dagar erbjuds kunder unika erbjudanden och kraftiga prisnedsättningar på produkter. Perioder som dessa blir därför viktiga för tillverkande företag då de ställs inför fler krav, i form av höga kundförväntningar och en ökad efterfrågan på produkter.

    Syftet med detta arbete är att undersöka om stora readagar har en påverkan på produktionen inom tillverkande företag. Mer specifikt undersöks om produktionen effektiviseras inför dessa dagar samt vilka metoder som används för att förutse efterfrågan och för att undvika potentiella risker.

    Frågeställningen besvaras genom att utföra två studier, en litteratur- och fältstudie. Med hjälp av litteraturstudien fås en teoretisk grund för rapporten. Fältstudien bidrar med den praktiska delen då den består av intervjuer med två väletablerade tillverkande företag samt en enkätundersökning riktad till kunder. Genom detta fås en bättre förståelse för hur företag hanterar stora readagar och för konsumenters krav och förväntningar.

    Resultat från intervjuer visar att företagen styr sina kunder, återförsäljararna, i vilket antal varor de ska beställa inför stora readagar. De styr således sin egna efterfrågan vilket minskar behovet av att effektivisera produktionen. Vid ökat tryck tar företagen även till andra åtgärder som att t.ex. hyra in extra arbetskraft. Att företagen överproducerar anser de inte vara ett problem då de förlitar sig på att varorna köps upp i efterhand.

    De främsta resultaten från enkätundersökningen visar att de varor som kunder söker under stora readagar ofta är slutsålda. Majoriteten av dessa kunder saknar förståelse för detta och det tyder på att det finns ett gap mellan företagens utbud och kundernas krav och förväntningar.

    Utifrån en analys av fältstudien i förhållande till litteraturstudien drogs sedan en slutsats. Företag väljer att inte effektivisera eller direkt påverka sin produktion inför stora readagar. De påverkas dock ur en ekonomisk synvinkel då de tar till kostsamma åtgärder för snabbare hantering inom produktionen. Vidare drogs en slutsats att kundernas verkliga krav och förväntningar inte möts under dessa dagar, vilket indikerar att företagen bör omvärdera vissa av sina metoder och strategier.

  • 16.
    Aboufazeli, N.
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Produktionssystem.
    Semere, D.T.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Produktionssystem.
    Ease of Reconfigurability Index: For Evaluation of the Reconfigurable Machine Tools2012Konferensbidrag (Refereegranskat)
    Abstract [en]

    One of the latest developments in manufacturing systems is reconfigurable manufacturing systems in which reconfigurable machine tools are the heart of such systems. The aim of application of this type of machine tool is having rapid cost-effective responsiveness to changes in new product variants or volume in manufacturing companies because of different interests, needs and desires of customers in global competitive market. The important tools to implement this kind of systems are systematic methodologies and enablers like open architecture controllers, Interface standard and comprehensive and integrated software to make the couple of limited optimized configurations of the machine tool. To choose the best configuration among proposed configuration by the software we need some evaluation methods based on smart chosen criteria to choose the best modular machine tool structure. One of the important points to choose the best configuration is ease of reconfigurability. The aim of this paper is to introduce a flexible and practical index for different products in reconfigurable manufacturing systems. This Index is defined based on two important factors: number of the changeable modules and the complexity of the interfaces including mechanical, informational and power (hydraulic, pneumatic or electrical).Generally the more number of the modules and the more complex interfaces means the more difficult to reconfigure the machine tool structure.

  • 17.
    Aboufazeli, Nasser
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Reconfigurable Machine Tools Design Methodologies and Measuring Reconfigurability for Design Evaluation2012Självständigt arbete på avancerad nivå (yrkesexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
  • 18.
    Abrahamsson, Magnus
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Optimering av bergtransporter i underjordsgruva2015Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Detta examensarbete utfördes på LKAB, en mineralkoncern som tillverkar och levererar järnmalmsprodukter. Arbetet utfördes för företagets underjordsgruva i Malmberget och behandlar tillredningens bergtransporter. Tillredningen är den process som förbereder nya delar av gruvan för järnmalmsbrytning. Målsättningen med arbetet har varit att kartlägga hur transporterna av tillredningsberg styrs samt att kvantifiera en besparingspotential för dessa transporter. Om möjligt skulle även förbättringsförslag presenteras. Underlaget till denna studie har inhämtats på plats i gruvan i Malmberget genom möten och samtal med personal, egna observationer och granskning av interna dokument. Uppgifter om tillredningens bergtransporter har även samlats in i form av fraktstatistik och prisuppgifter. För att nå studiens mål har två olika angreppssätt valts. För att kartlägga hur transporterna av tillredningsberg styrs har en flödeskartläggning genomförts. För att kvantifiera en besparingspotential har jag sökt minsta möjliga transportarbete och jämfört detta med verkligt utfall. Studien visar att det finns en bruttopotential att minska transportkostnaderna med 3060 tkr per halvår, motsvarande ca 20 % av den totala transportkostnaden. Av detta står underjordstransporterna för 2041 tkr (13 %) och transport ut från gruvan för 1019 tkr (6 %). Studiens avgränsningar gör dock att stor osäkerhet råder kring besparingspotentialen för transport ut från gruvan. Genom att göra schakt tillgängliga redan i tillredningsskedet, ökar möjligheten att reducera transportkostnaderna ytterligare.

  • 19.
    Abramson, Nils
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Mätteknik och optik.
    Article may have left false impression that light-in-flight method is new2008Ingår i: Laser Focus World, ISSN 1043-8092, Vol. 44, nr 4, s. 10-10Artikel i tidskrift (Övrigt vetenskapligt)
  • 20.
    Abramson, Nils
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Mätteknik och optik.
    FEMTOSECOND IMAGING Motion picture of short pulses2011Ingår i: Nature Photonics, ISSN 1749-4885, E-ISSN 1749-4893, Vol. 5, nr 7, s. 389-390Artikel i tidskrift (Refereegranskat)
  • 21.
    Abramson, Nils
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Holography, relativity and the spooky ellipsoids2006Ingår i: Proceedings of the 7th International Symposium on Display Holography: Advances In Display Holography / [ed] Bjelkhagen, HI, 2006, s. 228-235Konferensbidrag (Refereegranskat)
    Abstract [en]

    The further away from a house we move, the smaller it appears. We could say that we are in the centre of a "sphere of observation", which must reach the house before we can see it. The larger that sphere is, the smaller the house appears. This is natural to us and not difficult to understand. In Einstein's Special Relativity it is stated that the faster we move past a house, the shorter it appears. We state in this paper that this is because the faster we travel, the more our "sphere of observation" is elongated into an "ellipsoid of observation". The longer that ellipsoid is, the shorter the house appears. This contraction is not so natural to us, because to be observable the velocity has to be extremely high, almost close to the velocity of light. A similar phenomenon can, however, be studied when holography with ultrashort pulses is used for measurement. In this case the sphere of observation is also transformed into an ellipsoid of observation. Thus, according to our approach objects appear shorter because the definition of length (the metre) becomes longer, just as time moves slower because the definition of time (the second) becomes longer. The transformation of the sphere into an ellipsoid is however hidden to the observer both in the case of holography and in relativity. This spooky behaviour of the ellipsoid has resulted in a new mathematical theorem.

  • 22.
    Abramson, Nils
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Boman, J.
    Bonnevier, Björn
    KTH, Skolan för elektro- och systemteknik (EES), Centra, Alfvénlaboratoriet.
    Plane intersections of rotational ellipsoids2006Ingår i: The American mathematical monthly, ISSN 0002-9890, E-ISSN 1930-0972, Vol. 113, nr 4, s. 336-339Artikel i tidskrift (Refereegranskat)
  • 23.
    Abramson, Nils H.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Mätteknik och optik.
    Appearance of Objects at Relativistic Velocities, a Holographic Approach2010Ingår i: SEARCH FOR FUNDAMENTAL THEORY / [ed] Amoroso RL, Rowlands P, Jeffers S, MELVILLE, NY: AMER INST PHYSICS , 2010, Vol. 1316, s. 118-124Konferensbidrag (Refereegranskat)
    Abstract [en]

    A diagram borrowed from holographic interferometry has been applied to visualize phenomena in Special Relativity. It displays how a sphere of observation is by velocity elongated into an ellipsoid of observation and produces graphically all the well accepted equations of Einsteins Special Relativity. The Lorentz contraction, however, is explained as an elongation of the measuring rod, the meter, which by definition is based on either a specific number of wavelengths or the velocity of light multiplied by time. The diagram displays the total apparent object distortions including not only the Lorentz contraction but also larger apparent contractions and elongations caused by the classic Doppler Effect. The reasons of these deformations are the delays caused by variations in distance from observer to different parts of the moving object. In this paper we do not discuss the meaning of apparent, as compared to real, deformation.

  • 24.
    Abramson, Nils H.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Elliptic visualizing optical resolution and kinetic energy2017Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 56, nr 5, s. 1413-1416Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Diffraction limited resolution as introduced by Abbe is well established, but interference limited resolution was not well known until holographic interferometry was introduced. The holodiagram is used to simplify holography and in a new way visualize the distribution, ratio, and relation among resolutions of different optical techniques, including relativistic phenomena. Resolution, when measured by optical methods based on the number of wavelengths of light, is defined in the following as the minimum distance between resolvable points, or the largest object needed to be resolved. Everywhere in the diagram this resolution is represented by two orthogonal diagonals of rhombs.

  • 25.
    Abramson, Nils H.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Mätteknik och optik.
    Holodiagram: elliptic visualizing interferometry, relativity, and light-in-flight2014Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 53, nr 11, s. 2398-2404Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In holographic interferometry, there is usually a static distance separating the point of illumination and the point of observation. In Special Relativity, this separation is dynamic and is caused by the velocity of the observer. The corrections needed to compensate for these separations are similar in the two fields. We use the ellipsoids of the holodiagram for measurement and in a graphic way to explain and evaluate optical resolution, gated viewing, radar, holography, three-dimensional interferometry, Special Relativity, and light-in-flight recordings. Lorentz contraction together with time dilation is explained as the result of the eccentricity of the measuring ellipsoid, caused by its velocity. The extremely thin ellipsoid of the very first light appears as a beam aimed directly at the observer, which might explain the wave or ray duality of light and entanglement. Finally, we introduce the concept of ellipsoids of observation.

  • 26.
    Abramson, Nils H.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Mätteknik och optik.
    INSTANT RANDOM INFORMATION2010Ingår i: SEARCH FOR FUNDAMENTAL THEORY / [ed] Amoroso RL, Rowlands P, Jeffers S, MELVILLE, NY: AMER INST PHYSICS , 2010, Vol. 1316, s. 113-117Konferensbidrag (Refereegranskat)
    Abstract [en]

    Information is carried by matter or by energy and thus Einstein stated that "no information can travel faster than light." He also was very critical to the "Spooky action at distance" as described in Quantum Physics. However, many verified experiments have proven that the "Spooky actions" not only work at distance but also that they travel at a velocity faster than light, probably at infinite velocity. Examples are Young's fringes at low light levels or entanglements. My explanation is that this information is without energy. In the following I will refer to this spooky information as exformation, where "ex-" refers to existence, the information is not transported in any way, it simply exists. Thus Einstein might have been wrong when he stated that no information can travel faster than light. But he was is right in that no detectable information can travel faster than light. Phenomena connected to entanglement appear at first to be exceptions, but in those cases the information can not be reconstructed until energy is later sent in the form of correlation using ordinary information at the velocity of light. In entanglement we see that even if the exformation can not be detected directly because its luck of energy it still can influence what happens at random, bemuse in Quantum Physics there is by definition no energy difference between two states that happen randomly.

  • 27.
    Abramson, Nils H.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Lorentz contraction, apparent or real2013Ingår i: Progress In Electromagnetics Research Symposium Proceedings, Stockholm, Sweden, Aug. 12-15, 2013, 2013, s. 1547-1549Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Michelson Morley interference experiment of 1887 indicated that the velocity of light is independent of the velocities of source and observer. This surprising result was in conflict with earlier calculations. To make theory and experiment in agreement Lorentz stated a contraction of rigid objects parallel to velocity. We discuss if this contraction is real or caused by the interference method of measurement. Our approach is to introduce a sphere of observation based on ultra short light pulses combined to ultra short observations. When the experimenter travels at high velocity this sphere is according to Lorentz contracted into an oblate ellipsoid. According to our proposed theory the sphere is instead elongated into a prolate ellipsoid. The result of this effect is that stationary objects appear contracted. Our results are in full agreement to Einsteins Special Theory of Relativity. To support our statements we introduce a novel method to measure the length of a travelling object that is independent of interferometry.

  • 28.
    Abramson, Nils H.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Mätteknik och optik.
    Optical resolution and the duality of light2008Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 47, nr 19, s. D1-D5Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    For 15 years, lensless microscopes have been constructed based on the use of holography, a digital CCD detector, and a computer for image reconstruction by use of, e.g., Fourier transformation. Thus, no lens is involved and therefore the conventional resolution limit of half the wavelength no longer applies. Instead of being limited by the wavelength, the resolution is in this case limited by how exact one can measure the phases of the light. It is remarkable that the interference-limited resolution is approximately 0.01X, whereas the diffraction-limited resolution is only of the order of 0.5X. It is my hope that by combining these two techniques it will be possible to increase the magnification in optical systems by at least an order of magnitude. The calculations at so indicate that information does not necessarily decrease with distance.

  • 29. Adamson, G.
    et al.
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Holm, M.
    The state of the art of cloud manufacturing and future trends2013Ingår i: ASME 2013 International Manufacturing Science and Engineering Conference Collocated with the 41st North American Manufacturing Research Conference, MSEC 2013, 2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    Cloud manufacturing has emerged as a new manufacturing paradigm, which combines technologies (such as Internet of Things, Cloud computing, semantic Web, virtualisation and service-oriented technologies) with advanced manufacturing models, information and communication technologies. It aims to be networked, intelligent, service-oriented, knowledge-based and energy efficient, and promises a variety of benefits and advantages by providing fast, reliable and secure on-demand services for users. It is envisioned that companies in all sectors of manufacturing will be able to package their resources and know-hows in the Cloud, making them conveniently available for others through pay-as-you-go, which is also timely and economically attractive. Resources, e.g. manufacturing software tools, applications, knowledge and fabrication capabilities, will then be made accessible to presumptive consumers on a worldwide basis. After surveying a vast array of available publications, this paper presents an up-to-date literature review together with future trends and research directions in Cloud manufacturing.

  • 30. Adamson, G.
    et al.
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Holm, M.
    Moore, P.
    Adaptive robotic control in cloud environments2014Ingår i: FAIM 2014 - Proceedings of the 24th International Conference on Flexible Automation and Intelligent Manufacturing: Capturing Competitive Advantage via Advanced Manufacturing and Enterprise Transformation, DEStech Publications Inc , 2014, s. 37-44Konferensbidrag (Refereegranskat)
    Abstract [en]

    The increasing globalization is a trend which forces manufacturing industry of today to focus on more cost-effective manufacturing systems and collaboration within global supply chains and manufacturing networks. Cloud Manufacturing (CM) is evolving as a new manufacturing paradigm to match this trend, enabling the mutually advantageous sharing of resources, knowledge and information between distributed companies and manufacturing units. Providing a framework for collaboration within complex and critical tasks, such as manufacturing and design, it increases the companies' ability to successfully compete on a global marketplace. One of the major, crucial objectives for CM is the coordinated planning, control and execution of discrete manufacturing operations in a collaborative and networked environment. This paper describes the overall concept of adaptive Function Block control of manufacturing equipment in Cloud environments, with the specific focus on robotic assembly operations, and presents Cloud Robotics as "Robot Control-as-a-Service" within CM. © Copyright 2014 by DEStech Publications, Inc. All rights reserved.

  • 31. Adamson, G.
    et al.
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Holm, Magnus
    Moore, Philip
    Cloud Manufacturing – A Critical Review of Recent Development and Future Trends2017Ingår i: International journal of computer integrated manufacturing (Print), ISSN 0951-192X, E-ISSN 1362-3052, Vol. 30, nr 4-5, s. 347-380Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    There is an ongoing paradigm shift in manufacturing, in which the modern manufacturing industry is changing towards global manufacturing networks and supply chains. This will lead to the flexible usage of different globally distributed, scalable and sustainable, service-oriented manufacturing systems and resources. Combining recently emerged technologies, such as Internet of Things, Cloud Computing, Semantic Web, service-oriented technologies, virtualisation and advanced high-performance computing technologies, with advanced manufacturing models and information technologies, Cloud Manufacturing is a new manufacturing paradigm built on resource sharing, supporting and driving this change. It is envisioned that companies in all sectors of manufacturing will be able to package their resources and know-hows in the Cloud, making them conveniently available for others through pay-as-you-go, which is also timely and economically attractive. Resources, e.g. manufacturing software tools, applications, knowledge and fabrication capabilities and equipment, will then be made accessible to presumptive consumers on a worldwide basis. Cloud Manufacturing has been in focus for a great deal of research interest and suggested applications during recent years, by both industrial and academic communities. After surveying a vast array of available publications, this paper presents an up-to-date literature review together with identified outstanding research issues, and future trends and directions within Cloud Manufacturing.

  • 32. Adamson, Goran
    et al.
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion. University of Skövde, Sweden.
    Holm, Magnus
    Moore, Philip
    ADAPTIVE ROBOT CONTROL AS A SERVICE IN CLOUD MANUFACTURING2015Ingår i: PROCEEDINGS OF THE ASME 10TH INTERNATIONAL MANUFACTURING SCIENCE AND ENGINEERING CONFERENCE, 2015, VOL 2, ASME Press, 2015, Vol. 2Konferensbidrag (Refereegranskat)
    Abstract [en]

    The interest for implementing the concept of Manufacturing-as-a-Service is increasing as concepts for letting the manufacturing shop-floor domain take advantage of the cloud appear. Combining technologies such as Internet of Things, Cloud Computing, Semantic Web, virtualisation and service-oriented technologies with advanced manufacturing models, information and communication technologies, Cloud Manufacturing is emerging as a new manufacturing paradigm. The ideas of on-demand, scalable and pay-for-usage resource-sharing in this concept will move manufacturing towards distributed and collaborative missions in volatile partnerships. This will require a control approach for distributed planning and execution of cooperating manufacturing activities. Without control based on both global and local environmental conditions, the advantages of Cloud Manufacturing will not be fulfilled. By utilising smart and distributable decision modules such as event-driven Function Blocks, run-time manufacturing operations in a. distributed environment may be adjusted to prevailing manufacturing conditions. Packaged in a cloud service for manufacturing equipment control, they will satisfy the control needs. By combining different resource types, such as hard, soft and capability resources, the cloud service Robot Control-as-a-Service can be realised. This paper describes the functional perspective and enabling technologies for a distributed control approach for robotic assembly tasks in Cloud Manufacturing.

  • 33. Adamson, Goran
    et al.
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Holm, Magnus
    Moore, Philip
    FEATURE-BASED ADAPTIVE MANUFACTURING EQUIPMENT CONTROL FOR CLOUD ENVIRONMENTS2016Ingår i: PROCEEDINGS OF THE ASME 11TH INTERNATIONAL MANUFACTURING SCIENCE AND ENGINEERING CONFERENCE, 2016, VOL 2, AMER SOC MECHANICAL ENGINEERS , 2016Konferensbidrag (Refereegranskat)
    Abstract [en]

    The ideas of on-demand, scalable and pay-for-usage resource-sharing in Cloud Manufacturing are steadily attracting more interest. For implementing the concept of Manufacturing as-a-Service in a cloud environment, description models and implementation language for resources and their capabilities are required. A standardized approach for systemived virtualization, servisilisation, retrieval, selection and composition into higher levels of functionality is necessary. For the collaborative sharing and use of networked manufacturing resources there is also a need for a control approach for distributed manufacturing equipment. In this paper, the technological perspective for an adaptive cloud service-based control approach is described, and a supporting information model for its implementation. The control is realized through the use of a network of intelligent and distributable Function Block decision modules, enabling run-time manufacturing activities to be performed according to actual manufacturing conditions. The control system's integration to the cloud service management functionality is described, as well as a feature-level capability model and the use of ontologies and the Semantic Web.

  • 34.
    Adamson, Goran
    et al.
    Univ Skovde, Virtual Syst Res Ctr, Skovde, Sweden..
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Moore, Philip
    Univ Skovde, Virtual Syst Res Ctr, Skovde, Sweden..
    Feature-based function block control framework for manufacturing equipment in cloud environments2019Ingår i: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 57, nr 12, s. 3954-3974Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The ability to adaptively control manufacturing equipment in cloud environments is becoming increasingly more important. Industry 4.0, supported by Cyber Physical Systems and the concept of on-demand, scalable and pay-for-usage resource-sharing in cloud environments offers many promises regarding effective and flexible manufacturing. For implementing the concept of manufacturing services in a cloud environment, a cloud control approach for the sharing and control of networked manufacturing resources is required. This paper presents a cloud service-based control approach which has a product perspective and builds on the combination of event-driven IEC 61499 Function Blocks and product manufacturing features. Distributed control is realised through the use of a networked control structure of such Function Blocks as decision modules, enabling an adaptive run-time behaviour. The control approach has been developed and implemented as prototype systems for both local and distributed manufacturing scenarios, in both real and virtual applications. An application scenario is presented to demonstrate the applicability of the control approach. In this scenario, Assembly Feature-Function Blocks for adaptive control of robotic assembly tasks have been used.

  • 35. Adamson, Göran
    et al.
    Holm, Magnus
    Moore, Philip
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion. Univ Skövde, Sweden.
    A cloud service control approach for distributed and adaptive equipment control in cloud environments2016Ingår i: RESEARCH AND INNOVATION IN MANUFACTURING: KEY ENABLING TECHNOLOGIES FOR THE FACTORIES OF THE FUTURE - PROCEEDINGS OF THE 48TH CIRP CONFERENCE ON MANUFACTURING SYSTEMS, 2016, s. 644-649Konferensbidrag (Refereegranskat)
    Abstract [en]

    A developing trend within the manufacturing shop-floor domain is the move of manufacturing activities into cloud environments, as scalable, on-demand and pay-per-usage cloud services. This will radically change traditional manufacturing, as borderless, distributed and collaborative manufacturing missions between volatile, best suited groups of partners will impose a multitude of advantages. The evolving Cloud Manufacturing (CM) paradigm will enable this new manufacturing concept, and on-going research has described many of its anticipated core virtues and enabling technologies. However, a major key enabling technology within CM which has not yet been fully addressed is the dynamic and distributed planning, control and execution of scattered and cooperating shop-floor equipment, completing joint manufacturing tasks. In this paper, the technological perspective for a cloud service-based control approach is described, and how it could be implemented. Existing manufacturing resources, such as soft, hard and capability resources, can be packaged as cloud services, and combined to create different levels of equipment or manufacturing control, ranging from low-level control of single machines or devices (e.g. Robot Control-as-a-Service), up to the execution of high level multi-process manufacturing tasks (e.g. Manufacturing-as-a-Service). A multi-layer control approach, featuring adaptive decision-making for both global and local environmental conditions, is proposed. This is realized through the use of a network of intelligent and distributable decision modules such as event-driven Function Blocks, enabling run-time manufacturing activities to be performed according to actual manufacturing conditions. The control system's integration to the CM cloud service management functionality is also described.

  • 36. Adamson, Göran
    et al.
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Holm, Magnus
    Moore, Philip
    Function Block Approach for Adaptive Robotic Control in Virtual and Real Environments2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    Many manufacturing companies are facing an increasing amount of changes and uncertainty, caused by both internal and external factors. Frequently changing customer and market demands lead to variations in manufacturing quantities, product design and shorter product life-cycles, and variations in manufacturing capability and functionality contribute to a high level of uncertainty. The result is unpredictable manufacturing system performance, with an increased number of unforeseen events occurring in these systems. Such events are difficult for traditional planning and control systems to satisfactorily manage. For scenarios like these, with a dynamically changing manufacturing environment, adaptive decision making is crucial for successfully performing manufacturing operations. Relying on real-time information of manufacturing processes and operations, and their enabling resources, adaptive decision making can be realized with a control approach combining IEC 61499 event-driven Function Blocks (FBs) with manufacturing features. These FBs are small decision-making modules with embedded algorithms designed to generate the desired equipment control code. When dynamically triggered by event inputs, parameter values in their data inputs are forwarded to the appropriate algorithms, which generate new events and data output as control instructions. The data inputs also include monitored real-time information which allows the dynamic creation of equipment control code adapted to the actual run-time conditions on the shop-floor. Manufacturing features build on the concept that a manufacturing task can be broken down into a sequence of minor basic operations, in this research assembly features (AFs). These features define atomic assembly operations, and by combining and implementing these in the event-driven FB embedded algorithms, automatic code generation is possible. A test case with a virtual robot assembly cell is presented, demonstrating the functionality of the proposed control approach.

  • 37. Adamson, Göran
    et al.
    Wang, Lihui
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion. University of Skövde, Sweden.
    Moore, Philip
    Feature-based control and information framework for adaptive and distributed manufacturing in cyber physical systems2017Ingår i: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 143, s. 305-315Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Modern distributed manufacturing within Industry 4.0, supported by Cyber Physical Systems (CPSs), offers many promising capabilities regarding effective and flexible manufacturing, but there remain many challenges which may hinder its exploitation fully. One major issue is how to automatically control manufacturing equipment, e.g. industrial robots and CNC-machines, in an adaptive and effective manner. For collaborative sharing and use of distributed and networked manufacturing resources, a coherent, standardised approach for systemised planning and control at different manufacturing system levels and locations is a paramount prerequisite. In this paper, the concept of feature-based manufacturing for adaptive equipment control and resource task matching in distributed and collaborative CPS manufacturing environments is presented. The concept has a product perspective and builds on the combination of product manufacturing features and event-driven Function Blocks (FB) of the IEC 61499 standard. Distributed control is realised through the use of networked and smart FB decision modules, enabling the performance of collaborative runtime manufacturing activities according to actual manufacturing conditions. A feature-based information framework supporting the matching of manufacturing resources and tasks, as well as the feature-FB control concept, and a demonstration with a cyber-physical robot application, are presented.

  • 38.
    Adane, Tigist Fetene
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. KTH.
    Manufacturing Dynamics and Performance Evaluation2018Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Manufacturing companies are striving to remain competitive in the market and maintain their economic growth and productivity. Uncertainties regarding the changes in product demand, workpiece material, product design, and technological advancement, have imposed pressure on manufacturing systems. Market uncertainties force manufacturing companies to be flexible and responsive in producing different parts, by adapting the existing system without the need for a substantial investment. The market is characterized by time variations in product quantities and varieties while manufacturing systems remain inherently fixed. To sustain competitive manufacturing, a company has to adopt to new production requirements and be responsive to market changes quickly. Conscious decisions have to be made for a system to respond to market fluctuations. In order to respond to the dynamic changes, there is a need for developing methodologies that analyse, evaluate and control performance of manufacturing system at the system and/or process levels.

    The primary focus of the thesis is to develop a novel generic framework for modelling and controlling manufacturing systems intending for improvement of the performance of manufacturing and make companies more competitive. The framework incorporates the complex interrelations between the process and system parameters, i.e., the dynamics of the system. Thus, provides a quantitative and qualitative analysis for performance evaluation and for optimizing performance of manufacturing system. The generic framework can further be adapted for studying specific manufacturing systems in discrete manufacturing. Three case studies are presented. The case studies are performed in an automotive company where the effect of various levels of control is investigated in manufacturing systems configured as transfer line or as a flexible manufacturing system.

    Two aspects of the dynamic nature of manufacturing system are investigated in this thesis: (1) The engineering nature of the system, i.e., the selection of appropriate process parameters to manufacture a product according to the design specification, and (2) The business nature of the system, i.e., the selection of system parameters with respect to the way the product is manufactured. At the process level, the parameters are controlled within the process capability limits to adapt to the changes of the system parameters in response to the market dynamics. At the system level, operational parameters are controlled to satisfy performance criteria.

    A case study for resource use analysis during primary processes has also been investigated and presented. The critical operations and the operations that have the highest energy consumptions and the potential for energy savings have been identified.

    The methodology developed for analysing the performance of the dynamic manufacturing system is based on a system dynamics modelling approach. Results obtained from different modelling approaches are presented and compared based on the selected performance metrics.

  • 39.
    Adane, Tigist Fetene
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Mapping Energy Usage in Casting Process for Cylinder Head Production: Using System Dynamic Modeling and Simulation2011Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Daily life of our societies is strongly linked with the usage of natural resources. However, the vital resources of our planet especially energy is a limited resource. The energy consumption in the manufacturing industry is increasing and becoming noticeable; moreover it is being consumed in ways that can’t be sustained. There is great concern about minimizing the consumption of energy usage in the manufacturing industry and sustaining the natural carrying capacity of the ecosystem as well. This is one of the important challenges in today’s industrial world.

    This research work looks into one of the energy intensive manufacturing processes i.e. the casting process in automotive industry. Here the casting process for cylinder head manufacturing at one of the manufacturing plant in Europe is studied for identifying the most energy intensive steps namely melting, holding and pouring. Parameters that influence these steps and the relationships for energy consumption and dissipation have also been identified through extensive literature survey. By applying system dynamics modeling and simulation approach the interaction between each parameter in the overall process is analyzed in regard to energy consumption. By varying values of the parameters that have the highest impact in the process, the breakthrough opportunities that might dramatically reduce energy consumption during melting and holding have been explored, and potentially energy-saving areas based on the findings have also been identified. The output from this research work enables the company to identify potential avenues to optimize energy usage in the production and hence sustain its manufacturing.

  • 40.
    Adane, Tigist Fetene
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. KTH.
    Bianchi, Maria Floriana
    KTH, Skolan för industriell teknik och management (ITM).
    Archenti, Andreas
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. KTH, Skolan för industriell teknik och management (ITM), Centra, Design and Management of Manufacturing Systems, DMMS.
    Nicolescu, Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Performance evaluation of machining strategy for engine-block manufacturing2015Ingår i: Performance evaluation of machining strategy for engine-block manufacturing, ISSN 1895-7595, Vol. 15, nr 4, s. 81-102Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper will introduce a novel methodology for the performance evaluation of machining strategies of engine block manufacturing. The manufacturing of engine components is vital to the automotive and vehicle manufacturing industries. Machining is critical processes in the production of these parts. To survive and excel in the competitive manufacturing environment, companies need to improve as well as update their machining processes and evaluate the performance of their machining lines. Moreover, the lines and processes have to be robust in handling different sources of variation over time that include such examples as demand fluctuations, work-piece materials or even any changes in design specifications. A system dynamics modelling and simulation approach has been deployed to develop a methodology that captures how machining system parameters from the machining process are interacted with each other, how these connections drive performance and how new targets affect process and machine tool parameters through time. The developed model could provide an insight of how to select the crucial machining system parameters and to identify the effect of those parameters on the output of the system. In response to such an analysis, this paper provides (offers) a framework to examine machining strategies and has presented model that is useful as a decision support system for the evaluation and selection of machining strategies. Here a system dynamics methodology for modelling is applied to the milling operation and the model is based on an actual case study from the engine-block manufacturing industry.

  • 41.
    Adane, Tigist Fetene
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Nafisi, Mariam
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Asif, Farazee M. A.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Semere, Daniel T.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Nicolescu, Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    System dynamics analysis of energy usage: Case studies in automotive manufacturing2012Ingår i: SPS12 conference proceedings, 2012, s. 1-9Konferensbidrag (Refereegranskat)
    Abstract [en]

    Our life is strongly linked with the usage of natural resources. Energy is a necessity in everyday life and is often generated using non-renewable natural resources which are finite. Energy consumption in manufacturing industry is increasing and the way it is consumed is not sustainable. There is great concern about minimizing consumption of energy in manufacturing industry to sustain the natural carrying capacity of the ecosystem. This is one of the challenges in today’s industrial world.In this paper two case studies have been carried out in crankshaft machining and cylinder head casting processes. The outcome of this research enables the company to identify potential avenues to optimize energy usage and offers a decision support tool.

  • 42.
    Adane, Tigist Fetene
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. KTH.
    Nicolescu, Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    System dynamics analysis of energy usage: Case studies in automotive manufacturing2014Ingår i: International Journal of Manufacturing Research, ISSN 1750-0591, Vol. 9, nr 2, s. 131-156Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Our life is strongly linked with the usage of natural resources. With increase in world population and welfare there is an increasing global demand for raw material. Energy is a necessity in everyday life and is often generated using non-renewable natural resources which are finite. Manufacturing is one of the largest energy and material resource consumers. There is great concern about minimising consumption of energy in manufacturing industry to sustain the natural carrying capacity of the ecosystem. This is one of the challenges in today’s industrial world. The paper presents the application of system dynamics theory for modelling and simulation of complex manufacturing processes. The simulations help to understand the intricate nature of the interrelation of process parameter and to make sound decision about minimising the energy losses. Two case studies are presented, one in cylinder head casting processes and the other in crankshaft machining. The developed models provide an insight into how to select critical operations and to identify the effect of various parameters on the energy consumption. Also, the models help to understand how changes of parameters over time affect the behaviour of energy changes. The outcome of this research enables the company to identify potential avenues to minimise energy usage and offers a decision support tool.

  • 43.
    Adane, Tigist Fetene
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Nicolescu, Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    System dynamics as a decision support system for machine tool selection2016Ingår i: Journal of Machine Engineering, ISSN 1895-7595, Vol. 16, nr 3, s. 102-125Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The worldwide competitive economy, the increase in sustainable issue and investment of new production line is demanding companies to choose the right machine from the available ones. An improper selection can negatively affect the overall performance of the manufacturing system like productivity, quality, cost and company’s responsive manufacturing capabilities. Thus, selecting the right machine is desirable and substantial for the company to sustain competitive in the market. The ultimate objective of this paper is to formulate a framework for machining strategy and also provide methodology for selecting machine tool from two special purpose machine tools in consideration of interaction of attributes. A decision support system for the selection of machine tool is developed. It evaluates the performance of the machining process and enhances the manufacturer (decision maker) to select the machine with respect to the performance and the pre-chosen criteria. Case study was conducted in a manufacturing company. A system dynamics modelling and simulation techniques is demonstrated towards efficient selection of machine tool that satisfy the future requirement of engine-block production.

  • 44.
    Adane, Tigist
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi. KTH.
    Nicolescu, Mihai
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
    Towards a Generic Framework for the Performance Evaluation of Manufacturing Strategy: An Innovative Approach2018Ingår i: Towards a Generic Framework for the Performance Evaluation of Manufacturing Strategy: An Innovative Approach, Vol. 9, nr 2, s. 131-156Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    To be competitive in a manufacturing environment by providing optimal performance in terms of cost-effectiveness and swiftness of system changes, there is a need for flexible production systems based on a well-defined strategy. Companies are steadily looking for methodology to evaluate, improve and update the performance of manufacturing systems for processing operations. Implementation of an adequate strategy for these systems’ flexibility requires a deep understanding of the intricate interactions between the machining process parameters and the manufacturing system’s operational parameters. This paper proposes a framework/generic model for one of the most common metal cuttingoperations—the boring process of an engine block machining system. A system dynamics modelling approach is presented for modelling the structure of machining system parameters of the boring process, key performance parameters and their intrinsic relationships. The model is based on a case study performed in a company manufacturing engine blocks for heavy vehicles. The approach could allow for performance evaluation of an engine block manufacturing system condition. The presented model enables a basis for other similar processes and industries producing discrete parts.

  • 45.
    Adelander, Daniel
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Kousay, Samir
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Beslutsverktyg för återtillverkningav cyklar2015Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Sammanfattning

     

    Det ökande behovet av produkter orsakat av den ökande världspopulationen innebär ett behov av förbättrad tillverkning. Syftet med detta arbete är att introducera en metod för att jämföra och dra slutsatser om hur en standard cykel ska återtillverkas.

    Detta för att hjälpa till med implementering av återtillverkning i cykelproduktionsindustrin. En modell för uträkningar som inkluderar kostnaden och återanvändningsbarheten hos olika komponenter presenterades och diskuterades så väl som två olika sätt att använda modellen.

     Det första användningsområdet tillåter användaren att besluta vilken utav flera produktkonfigurationer som ska användas och den andra hjälper till att besluta om en produkt ska återtillverkas eller demonteras. Information samlades in via tre olika intervjuer med cykeltillverkare i Sverige. Resultatet visade att vissa tillverkare ignorerar möjligheterna med återtillverkning samtidigt som vissa redan implementerat dem utan problem.

     

    Med små eller utan modifieringar kan modellen användas i många andra produktkategorier och andra produkter.

    Analysering av beslutsmodellen visade att den är begränsad till produkter med liknande säljpriser. Fortsatt arbete kan resultera i förbättringar av modellen som implementerar aspekter såsom material och dess miljöpåverkan så väl som energianvändning och transport.

  • 46.
    af Klintberg, Janine
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Brodin, Philip
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Kommunikation inom projekt: En analys av projektledarrollen utifrån en beteendevetenskaplig metod2010Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Många problem som uppstår inom projekt beror på dålig kommunikation. Om man på något vis kan undvika dessa kommunikationsmisstag kan man spara en hel del tid och resurser.

    En analys av hur projektledare kommunicerar har genomförts med utgångspunkt i en beteendevetenskaplig modell. Frågor som utretts är:

    1. Hur kan en projektledare kommunicera på ett så individanpassat sätt som möjligt?

    2. Vilka problem finns med individanpassad kommunikation inom ett projekt?

    Som metod för inhämtning av kunskap har en omfattande litteraturstudie genomförts för att sedan följas upp av en intervju med en sakkunnig inom den teoretiska referensram som valts. IPU Profilanalys är en metod som kategoriserar människors beteenden på ett pedagogiskt sätt. De mänskliga beteendena delas upp i fyra typer vilka allmänt kallas för Dominant, Inspiratör, Stabil och Analytisk. För att få en empirisk grund inom ämnet samt för att se hur teorin stämmer med verkligheten har tre intervjuer genomförts. Två projektledare från Ericsson respektive Statens Maritima museer samt en objektledare från Scania har intervjuats. Intervjufrågorna var av semistrukturerad karaktär och byggde på ett tänkt projekt. De omfattade såväl vilka sätt projektledaren vanligen väljer att kommunicera på som hur denne resonerar kring tekniska hjälpmedel. Syftet var att utreda hur projektledarna av- eller oavsiktligt anpassade kommunikationen efter individerna inom organisationen. Svaren från intervjuerna har sedan jämförts med teorin från IPU Profilanalys för att avgöra om individanpassad kommunikation tillämpas och i så fall hur mycket. För att kommunikationen ska bli så anpassad efter de olika grupperna projektledaren har kring sig som möjligt bör denne beakta ett antal faktorer speciellt noggrant. Dessa är:

    • En gemensam målbild
    • Varierande kommunikation
    • Ge projektmedlemmar möjlighet att förbereda sig innan möten

    Problematiken med individanpassad kommunikation visade sig främst vid stressade tidsplaner. Det visade sig även att det inte alltid var möjligt att använda sig av individanpassad kommunikation fullt ut.

  • 47.
    Afshari, Arsham
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Li, John-Ting
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Product Development: The theory and its applicability in practice2012Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This paper is a qualitative research to understand how well the theoretical methods of product development are applied in practice. A comparison between the theory and methods the companies are using is done in order to get an insight of the current situation. Value analysis, Quality Function Deployment, Failure Mode and Effects Analysis, Design for Assembly, and Modular Function Deployment that is brought up in this thesis are all well-known methods in the theory which assist companies to achieve a higher degree and effectiveness with their development. These methods answer fundamental problems that may occur in every company, and touches on areas such as the economical perspectives and customer related inquiries. It also finds solutions on uncertainties that might arise during product development. After interviewing ABB, Scania and Atlas Copco, we learned that some of the theoretical methods were in fact utilized to a certain degree. However, there are instances where the enterprises establish their own principles to rationalize product development. After a thorough comparison made between the methods used by the companies and the theory, we discovered many similarities between them. The foundations of these methods are very much based on the existing theories. We concluded that even though the theoretical methods aren’t applicable to all situations, the fundamentals are widely accepted and the philosophies behind them are commonly applied in companies’ own methods. The theory does not only act as a backbone for effective product development but also serves as an important tool for further method customization suitable to the uniqueness of each enterprise. Lack of knowledge in the actual theories can therefore undermine the companies’ capability in achieving efficient methods which ultimately will only disfavor themselves in terms of time and money. Companies spend a lot of time to discover methods to facilitate their development processes. They can instead collaborate with academic institutes and universities to exchange information since theories already exist out there that are able to answer and solve most the companies’ current situation and their requirements. However, there are occasions in real life circumstances where things doesn’t necessary go as smooth as depicted in literatures and theories. Therefore a balance between practice and theory where they complement each other will yield the optimal outcome.

  • 48.
    Agerberg, Anton
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Carlson, Catja
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    PHOTOVOLTAIC ELECTRIFICATION IN CAMEROON: - A study for the Renewable Energy Program initiated by Engineers Without Borders SWE2017Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    I subsahariska Afrika är bristen på elektricitet stor och antalet hushåll med tillgång till el är lägre än 20%. I jakten på en lösning är det många som är positiva till potentialen hos förnybara energikällor. Bland dem finns Ingenjörer utan gränser Sverige, som hoppas på att genom introduceringen av sitt Renewable Energy Program kunna påskynda spridningen av förnybara energikällor på ett hållbart sätt, genom att bland annat öka möjligheterna för lokala entreprenörer som är aktiva inom området. I Kamerun, som ligger i västra Centralafrika, skiner solen intensivt året runt. Användning av solceller som en källa till elektricitet i landets mer avskilda samhällen har stor potential för att kunna bli en hållbar lösning. Syftet med detta arbete har varit att identifiera de tekniska och finansiella utmaningar som kan ligga i vägen för ökad användning av solcellslösningar i Kamerun, i en förhoppning om att underlätta implementeringen av Ingenjörer utan gränsers energiprogram. En fältstudie i det lilla samhället Tatum, beläget i landets nordvästra region, har utförts och författarna har genom intervjuer och enkäter samlat på sig lokala insikter och kunskaper. Utifrån dessa har slutsatser kring ett antal utmaningar kunnat dras. Ett av de mest uppenbara problemen med solcellslösningar är att de i dagsläget är för dyra för invånare i fattiga samhällen. Studien visade dock på att det finns en investeringsvilja hos dem, så länge investeringen sker i tryggheten av ett strukturerat program. I övrigt visade studien på att mängden lokala tekniker inom solcellsindustrin idag är liten. Den visade också på låg kunskap kring solcellslösningar hos den lokala befolkningen. Författarna föreslår att problemet med antalet tekniker skulle kunna besvaras med ett trainee-program. När det gäller kunskapsspridning ser de positivt på en organisk spridning genom vad de upplevde som ett mycket kommunikativt samhälle. I det stora hela sammanfattas studien i en positiv anda med en tro om att Ingenjörer utan gränser kommer lyckas med sitt mål, trots en del hinder på vägen.

  • 49.
    Ahmed, Sabih Zeb
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Reduction of vibrations during horizontal milling of aluminum parts: An Experimental and Numerical Study 2012Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This thesis aims at vibration problem during milling operation. Vibration sets in at tool- workpiece interface if certain conditions are achieved. Research has been carried out try to reduce or eliminate chatter. Chatter decreases the dimensional accuracy and surface finish of workpiece.

    Main objective is to examine the source of vibration and provide as solution to problem based on the findings. CAD Model of workpiece and clamping has been developed as close to real system as possible. Experimental modal analysis and Finite Element analysis is done to obtain system behaviour during vibration. Natural frequencies are determined and then compared with possible sources of excitation.

    Modal testing and computer simulations are done before and after Final cutting operations to map out complete behaviour of system. Both forced excitation and self-excited vibrations are taken in consideration during measurements. Finally calculations are done to determine the solution and give recommendations. Suggestions for future work in this area are also provided that could enable SAAB to analyse and improve machining of all parts.

  • 50.
    Ahrén, Jesper
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Bühlman, Carl
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Lean Production: Redogörelse av Lean och jämförelse med Scanias produktionssystem2015Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Sammanfattning

    Syftet med denna rapport är att täcka och förklara grunderna för Lean Production, hur det implementeras i industrin samt att jämföra Lean i teori och praktik.Vi vill ta reda på vad som kännetecknar en lyckad tillämpning av Lean och vad det kan medföra för resultat. Lean Production är en vidareutveckling av TPS (Toyota Production System), en filosofi om hur man gör ett företag mer resurseffektivt. TPS är ett resultat av Toyotas arbete att eliminera slöseri och kombinerar massproduktion med stor valfrihet.

    För att inte välja ett för brett område valde vi att titta specifikt på Lean i fordonsindustrin och för att bättre förstå industrin i dag har vi intervjuat en anställd på Scania. Den teoretiska delen av vårt arbete genomfördes av litteraturstudier, KTH databassökning och hemsidor. Scania har utvecklat sina egen Lean filosofi, SPS (Scania Production System) som är ett resultat av ett samarbete med Toyota.

    Det finns flera olika strategier ett företag kan vidta för att identifiera och förbättra sina svagheter. Lean fokuserar på eliminering av slöseri men också hur man använder resurserna på ett effektivt sätt. Toyota Production System är baserat på 14 principer, medan Lean Production har fem principer som bas, men det finns dock flera tolkningar.

    Under arbetet har vi funnit att en nyckelfaktor för en lyckad Lean-­‐implementering är att få hela organisationen att se och att tro på konceptet, men man måste även ganska snabbt kunna påvisa resultat och förbättringar. För att nå detta mål är en tydlig presentation av resultat och goda ledare nyckelfaktorer. För att inte falla tillbaka i gamla vanor har vi funnit att ett standardiserat arbetssätt där man skapar förutsättningar för de anställda att ständigt förbättra sin situation är avgörande.

    För Scanias del har Lean-­‐implementeringen inneburit ökad kvalitet och produktivitet, högre närvaro, lägre energikonsumtion samt bättre lönsamhet än konkurrenter. Man har skapat en god organisation för både samhället, kunderna och sina anställda, vilket har varit nödvändigt för Scanias överlevnad.

1234567 1 - 50 av 1687
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf