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  • 1.
    A Asif, Farazee M
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Circular Manufacturing Systems: A development framework with analysis methods and tools for implementation2017Doctoral thesis, comprehensive summary (Other academic)
    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, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Rashid, Amir
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Bianchi, Carmine
    University of Palermo (ITALY) Faculty of Political Sciences - Department of International Studies .
    Nicolescu, Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Performance analysis of the closed loop supply chain2012In: Journal of Remanufacturing, ISSN 2210-4690, Vol. 2, no 4Article in journal (Refereed)
    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.
    Abbas, Maryam
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Knowledge Management vid uppdragsarbete2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 4.
    Abdullah Asif, Farazee Mohammad
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Resource Conservative Manufacturing: New Generation of Manufacturing2011Licentiate thesis, comprehensive summary (Other academic)
    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.

  • 5.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Nicolescu, Cornel Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Minimizing Uncertainty Involved in Designing the Closed-loop Supply Network for Multiple-lifecycle of Products2010In: Annals Of DAAAM for 2010 & Proceedings of 21st DAAAM Symposium: Intelligent Manufacturing and Automation / [ed] Branko Katalinic, Zadar: DAAAM International , 2010, 1055-1056 p.Conference paper (Refereed)
    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.

  • 6. Adamson, Göran
    et al.
    Wang, Lihui
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering. University of Skövde, Sweden.
    Moore, Philip
    Feature-based control and information framework for adaptive and distributed manufacturing in cyber physical systems2017In: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 143, 305-315 p.Article in journal (Refereed)
    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.

  • 7.
    Adane, Tigist Fetene
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Nicolescu, Mariam
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    System dynamics analysis of energy usage: Case studies in automotive manufacturing2014In: International Journal of Manufacturing Research, ISSN 1750-0591, Vol. 9, no 2, 131-156 p.Article in journal (Refereed)
    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.

  • 8.
    Aganovic, Dario
    et al.
    KTH, Superseded Departments, Production Engineering.
    Bjelkemyr, Marcus
    KTH, Superseded Departments, Production Engineering.
    A Model for Project-Based Education in Manufacturing System Design and Its Application on Testing Research Results2004In: 8th International Design Conference - Design 2004, 2004, 583-594 p.Conference paper (Refereed)
  • 9.
    Aganovic, Dario
    et al.
    KTH, Superseded Departments, Production Engineering.
    Bjelkemyr, Marcus
    KTH, Superseded Departments, Production Engineering.
    Lindberg, Bengt
    KTH, Superseded Departments, Production Engineering.
    Applicability of Engineering Design Theory on Manufacturing System Design in the Context of Concurrent Engineering2004In: Methods and Tools for Co-operative and Integrated Design, Dordrecht, Netherlands: Kluwer Academic Publishers , 2004, 145-158 p.Chapter in book (Other academic)
    Abstract [en]

     

    The relationship between a product and a manufacturing system is addressed in various engineering design theories. The different approaches in the engineering design field are mainly focused on product design. The purpose of this paper is to review theories in the area of engineering design, in order to discuss applicability of engineering design theories on the concurrent product and manufacturing system development. The reviewed theories are: Axiomatic Design, Robust Design, Theory of Domains, and Theory of Technical Systems.

  • 10.
    Ahlroth, Sofia
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Environmental Strategies.
    Nilsson, Måns
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Environmental Strategies.
    Finnveden, Göran
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Environmental Strategies. School of Computer Science and Communication (CSC), Centres, KTH, School of Architecture and the Built Environment (ABE), Centres, Centre for Sustainable Communications, CESC.
    Hjelm, Olof
    Hochschorner, Elisabeth
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Environmental Strategies.
    Weighting and valuation in selected environmental systems analysis tools - suggestions for further developments2011In: Journal of Cleaner Production, ISSN 0959-6526, Vol. 19, no 2-3, 145-156 p.Article in journal (Refereed)
    Abstract [en]

    In environmental systems analysis tools like Life Cycle Assessment, strategic environmental assessment, cost benefit analysis and environmental management systems, results need to be presented in a comprehensible way to make alternatives easily comparable. One way of doing this is to aggregate results to a manageable set by using weighting methods.. In this paper, we explore how weighting methods are used in some selected Environmental Systems Analysis Tools (ESATs), and suggest possible developments of their use. We examine the differences in current use patterns, discuss the reasons for and implications of such differences, and investigate whether observed differences in use are necessary. The result of our survey shows that weighting and valuation is broadly used in the examined ESATs. The use of weighting/valuation methods is different in different tools, but these differences are not always related to the application; rather, they are related to traditions and views on valuation and weighting. Also, although the requirements on the weights/values may differ between tools, there are intersections where they coincide. Monetary weights, using either endpoint or midpoint methods, are found to be useful in all the selected tools. Furthermore, the inventory shows that that there is a common need for generic sets of weights. There is a need for further research focusing on the development of consistent value sets derived with a wide range of methods. In parallel to the development of weighting methods it is important with critical evaluations of the weighting sets with regard to scientific quality, consistency and data gaps.

  • 11.
    Ahmad, Aftab
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Andersson, Kjell
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
    Sellgren, Ulf
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
    An approach to stiffness analysis methodology for haptic devices2011In: 2011 3rd International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), IEEE conference proceedings, 2011, , 8 p.1-8 p.Conference paper (Refereed)
    Abstract [en]

    In this work a new methodology is proposed to model the static stiffness of a haptic device. This methodology can be used for other parallel, serial and hybrid manipulators. The stiffness model considers the stiffness of; actuation system; flexible links and passive joints. For the modeling of the passive joints a Hertzian contact model is introduced for both spherical and universal joints and a simply supported beam model for universal joints. For validation of the stiffness model a modified JP Merlet kinematic structure has been used as a test case. A parametric Ansys FEM model was developed for this test case and used to validate the resulting stiffness model. The findings in this paper can provide an additional index to use for multi-objective structural optimization to find an optimum compromise between a lightweight design and the stiffness performance for high precision motion within a larger workspace.

  • 12.
    Akillioglu, Hakan
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Demand Responsive Planning: A dynamic and responsive planning framework based on workload control theory for cyber-physical production systems2015Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Recent developments in the area of Cyber-Physical Production Systems prove that high technology readiness level is already achieved and industrialization of such technologies is not far from today. Although these technologies seem to be convenient in providing solutions to environmental uncertainties, their application provides adaptability only at shop floor level. Needless to say, an enterprise cannot reach true adaptability without ensuring adaptation skills at every level in its hierarchy. Commonly used production planning and control approaches in industry today inherit from planning solutions which are developed in response to historical market characteristics. However, market tendency in recent years is towards making personalized products a norm. The emerging complexity out of this trend obliges planning systems to a transition from non-recurring, static planning into continuous re-planning and re-configuration of systems. Therefore, there is a need of responsive planning solutions which are integrated to highly adaptable production system characteristics.

    In this dissertation, Demand Responsive Planning, DRP, is presented which is a planning framework aiming to respond to planning needs of shifting trends in both production system technologies and market conditions. The DRP is based on three main constructs such as dynamicity, responsiveness and use of precise data. These features set up the foundation of accomplishing a high degree of adaptability in planning activities. By this means, problems from an extensive scope can be handled with a responsive behavior (i.e. frequent re-planning) by the use of precise data. The use of precise data implies to execute planning activities subject to actual demand information and real-time shop floor data. Within the context of the DRP, both a continuous workload control method and a dynamic capacity adjustment approach are developed. A test-bed is coded in order to simulate proposed method based on a system emulation reflecting the characteristics of cyber-physical production systems at shop floor level.

    Continuous Precise Workload Control, CPWLC, method is a novel approach aiming at precise control of workload levels with the use of direct load graphs. Supported by a multi-agent platform, it generates dynamic non-periodic release decisions exploiting real time shop floor information. As a result, improved shop floor performances are achieved through controlling workload levels precisely by the release of appropriate job types at the right time.

    Presented dynamic capacity adjustment approach utilizes rapid re-configuration capability of cyber-physical systems in achieving more frequent capacity adjustments. Its implementation architecture is integrated to the CPWLC structure. By this means, a holistic approach is realized whereby improved due date performance is accomplished with minimized shop floor congestion. Hence, sensitivity to changing demand patterns and urgent job completions is improved.

  • 13.
    Akillioglu, Hakan
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Evolvable Production Systems: Demand Responsive Planning2011Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Dynamic and unforeseeable characteristic of the current market and production environment is not feasible to be met through pre-set parameters being dependent on the predictions. Handling this matter requires to keep focus on production system adaptability. Evolvable Production System has achieved fully system reconfigurability through process oriented modularity and multi agent based distributed control system architecture. One of the essential enhancements provided by EPS on the shop floor is achieving minimized/eliminated system setup time in response to changing product requirements.

    Manufacturing planning and control system, on the other hand, follows hierarchical principles which are quite much reliant on the predicted information so to structure production and planning environment on it. Production system limitations, such as lack of adaptability in response to changing conditions, are in fact influencing the planning system to be structured on the predictions. The enhancements which are ensured by the architecture of EPS enable to relax the constraints on planning system which are imposed by the limitations of production system. These enhancements have an effect at different levels in the planning hierarchy. On the light of these improvements, the planning framework as it is used so far in the industry becomes invalid and this arise a requirement for planning system structure to be designed according to a fully reconfigurable system to be able to benefit such a production system by all means.

    This thesis targets to enlighten the relation between the production system characteristics and planning system structure by emphasizing the planning problems and proposing a planning reference architecture solution to be able achieve a responsive planning framework.

  • 14.
    Akillioglu, Hakan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Dias-Ferreira, Joao
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Onori, Mauro
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Characterization of Continuous Precise Workload Control and Analysis of Idleness Penalty2014In: CIE 44 and IMSS14 proceedings, 2014, 1998-2011 p.Conference paper (Refereed)
    Abstract [en]

    The variability in the market conditions is growing in terms of its frequency of change and range of diversity. In response to this new industrial panorama, research on production systems is aiming to achieve truly reconfigurable shop floors. Frequent changes in such systems require also frequent re-planning with updated information. In this regard the Continuous Precise Workload Control method, is a recent approach aiming at precise control of workload in the shop floor with the use of direct load graphs. Supported by a multi-agent platform, it generates dynamic non-periodic release decisions exploiting real time shop floor information. The study in this paper is two folded; (1) in order to highlight its distinctive characteristics, the presented workload approach is defined in terms of eight dimensions of the workload control concept and (2) the penalty of idleness which affects the decision of release is analyzed by an experiment design in order to investigate its correlation with two critical parameters, norm value and assessment range. The results show that the idleness penalty factor decreases the idleness of the resources up to a point where the adverse effect is initiated. Besides there are strong indications towards the correlation of idleness penalty factor with the norm value.

  • 15.
    Akillioglu, Hakan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Dias-Ferreira, Joao
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Onori, Mauro
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Characterization of continuous precise workload control and analysis of idleness penalty2016In: COMPUTERS & INDUSTRIAL ENGINEERING, ISSN 0360-8352, Vol. 102, 351-358 p.Article in journal (Refereed)
    Abstract [en]

    The variability in the market conditions is growing in terms of its frequency of change and range of diversity. In response to this new industrial panorama, research on production systems is aiming to achieve highly reconfigurable shop floors. Frequent changes in such systems require also frequent re-planning with updated information. In this regard the Continuous Precise Workload Control method, is a recent approach aiming at precise control of workload in shop floor with the use of direct load graphs. Supported by a multi-agent platform, it generates dynamic non-periodic release decisions exploiting real time shop floor information, The study in this paper is two folded; (1) the presented workload approach is defined in terms of eight dimensions of the workload control concept in order to highlight its distinctive characteristics and (2) the impact of idleness penalty factor is analyzed by an experiment design in order to investigate its effect on the job release decision. The results show that the idleness penalty factor decreases the idleness of the resources up to a point where the adverse effect is initiated.

  • 16.
    Akillioglu, Hakan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Ferreira, Joao
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Onori, Mauro
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Demand responsive planning: workload control implementation2013In: Assembly Automation, ISSN 0144-5154, E-ISSN 1758-4078, Vol. 33, no 3, 247-259 p.Article in journal (Refereed)
    Abstract [en]

    Purpose – Evolvable production systems enable fully reconfiguration capabilities on the shop floor through process-oriented modularity and multiagent-based distributed control. To be able to benefit architectural and operational characteristics of evolvable systems, there is a need of a newplanning approach which links shop floor characteristics and planning operations. This paper seeks to address these issues.

    Design/methodology/approach – Evolvable production system has a structured methodology in itself. Consistent to this, a reference planningarchitecture is developed aiming to achieve agility on planning activities. Besides a workload control method is proposed and implemented as a part ofthe planning architecture.

    Findings – First applications of evolvable systems have been implemented through European research projects. Shop floor working principles andarchitectural characteristics are consistent to facilitate more agility on planning activities which are framed at a planning reference architecture calleddemand responsive planning. As an implementation case, an agent-based workload control method is proposed and implemented. The characteristicsof EPS and proposed planning architecture enable continuous and dynamic workload control of the shop floor to be implemented.

    Originality/value – This paper presents a new planning model compatible with evolvable production systems targeting to agility to demand onplanning and control activities benefiting shop floor enhancements of a fully reconfigurable system which enables to relax constraints imposed fromproduction systems to planning. In addition, a continuous and dynamic workload control method is proposed and implemented.

  • 17.
    Akillioglu, Hakan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Maffei, Antonio
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Neves, Pedro
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Ferreira, Joao
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Operational characterization of evolvable productionsystems2012In: 4th CIRP Conference on Assembly Technologies and Systems – CATS 2012, 2012, 85-90 p.Conference paper (Refereed)
    Abstract [en]

    On the way to achieve mass customization production systems have to obtain the capability of rapid reconfiguration of not only physical components but also from control point of view. Evolvable Production System targets highly adaptable mechanical and control solutions that can enhance reusability and interoperability of modules, enabling lifetime extension of the modules. The focus of EPS paradigm is to achieve overall system adaptability by autonomous modules which are dedicated to specific processes with the capability of short deployment time at shop floor without reprogramming effort. From the operational point of view EPS brings significant enhancements considering shop floor dynamics and performances therefore positioning of EPS principles and approaches in production system typology from different perspectives is essential. This has been done by two means which are process flow structure and customer order decoupling point location.

  • 18.
    Akillioglu, Hakan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Onori, Mauro
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Evolvable production systems and impacts on production planning2011Conference paper (Other academic)
    Abstract [en]

    Production planning and control strategies have been changing in line with the constant change on product and customer requirements, under the light of technological and scientific advancements. Production systems which are based on mass production became obsolete in time hence companies, being profit oriented, are in need of new solutions towards mass customization to handle rapidly changing market conditions. To deal with this issue, production systems and production planning strategies have to be complementing each other. In this paper Evolvable Production Systems and its compatibility to Just in Time (JIT) Production compared to Material Requirement Planning (MRP) will be discussed.

  • 19.
    Alallak, Ali
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Deburring of components: A survey of current and future deburring processes2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The machining operations that shape a metal component produce a raised edge or small pieces of material remaining attached to a work piece called burrs and sharp edges. The deburring process is intended to remove these imperfections and produce specific edge profiles.

    Burr formation during machining operations is one of the most significant problems encountered by industrial companies in component manufacturing. Remaining burrs after machining pose a severe risk for component breakdowns, if the burrs get loose. All work piece edges must therefore be completely defect-free.

    In the machining industry manual methods are commonly employed for burr removal. Fully automating deburring operations present a major challenge. Furthermore, removal of internal burrs of various sizes and shapes from parts sometimes becomes an extremely difficult task which causes high cost for labor, time losses, and health and safety risks.

    Increasingly, manufacturers are expected to deliver burr-free parts to their customer. Sandvik Coromant, Scania and Volvo Cars are three of these manufacturers, and these three companies have agreed to contribute to this thesis.

    Sandvik Coromant AB is part of the global enterprise Sandvik Group AB, and is world- leading in providing and developing cutting tools for the metal working industry. The company operates in over 60 countries worldwide and its main production plant is located in Gimo, Sweden [www.sandvik.com].

    Scania is a global automotive industry manufacturer of commercial vehicles—specifically heavy trucks and buses. It also manufactures diesel engines for motive power of heavy vehicles, marine, and general industrial applications. Scania was founded in 1891 in Södertälje, Sweden. Today, Scania has ten production facilities worldwide [www.scania.com].

    Volvo Car Corporation is an automobile manufacturer founded in 1927, in Gothenburg, Sweden. Volvo Cars has approximately 2,300 local dealers and around 100 national sales companies worldwide. Volvo Car Engine is a part of Volvo Cars. Volvo Car Engine produces engines and other components for other units, and it is headquartered in Skövde, Sweden [www.volvocars.com].

    All of the companies above have problems in burr minimizing and removing strategy in machining and deburring operations to achieve quality assurance. Therefore, to choose a deburring system, and to reveal the results of deburring operations, it is necessary to be able to inspect/measure burrs. But, unfortunately, most industrial companies today lack the specialized systems to measure the presence of burrs, which adversely affect the overall deburring process. In this thesis, different types and sizes of work pieces have been taken directly from the production to measure burrs, and conduct experiments on them.

    The thesis focuses on three areas:

    • A survey of the current deburring problems, including burr classification and measurement, current minimization strategies of burr formation, and current deburring methods.
    • Experiments on new and improved deburring methods, including deburring tools (e.g. drilling deburring tools, countersink tools, grinding tools and alumina fiber brushes), water-jet deburring (multi-nozzle rotary lance jets, pure and abrasive single rotary nozzle water jets).
    • A selection matrix as a thesis conclusion which relates these methods to criteria of deburring processes, such as process performance, industrial applications, quality assurance, safety and environment, costs, etc. This matrix can be a basis for a more detailed selection/decision matrix in the future.
  • 20. Alam, Minhaj M
    et al.
    Barsoum, Zuheir
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
    Jonsén, Pär
    Häggblad, Hans Åke
    Kaplan, Alexander
    Fatigue behaviour study of laser hybrid welded eccentric fillet joints – Part II: State-of-the-art of fracture mechanics and fatigue analysis of welded joints2009In: 12th NOLAMP proceeding 2009: Nordic Laser Materials Processing Conference / [ed] Erling Dam Mortensen, 2009Conference paper (Other academic)
    Abstract [en]

    Simplified fatigue and fracture mechanics based assessment methods are widely used by the industry to determine the structural integrity significance of postulated cracks, manufacturing flaws, service-induced cracking or suspected degradation of engineering components under normal and abnormal service loads. In many cases, welded joints are the regions most likely to contain original fabrication defects or cracks initiating and growing during service operation. The welded joints are a major component that is often blamed for causing a structure failure or for being the point at which fatigue or fracture problems initiate and propagate. Various mathematical models/techniques for various classes of welded joints are developed by analytically or by simulation software's that can be used in fatigue and fracture assessments. This literature survey compiled useful information on fracture and fatigue analysis of various welded joints. The present review is divided into two major sections- fracture mechanics and fatigue analysis with widely used models. A survey table is also introduced to get the outlook of research trend on fatigue and fracture over last 3 decades. Although tremendous research effort has been implemented on fatigue and fracture analysis of conventional welding, research on relatively new welding technology (laser welding, hybrid laser welding) is still limited and unsatisfactory. In order to give guarantee or make welding standard for new welding technology, further research is required in the field of fatigue and fracture mechanics including FEM and multi-scale modeling.

  • 21. Alam, Minhaj M
    et al.
    Barsoum, Zuheir
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
    Josén, Per
    Häggblad, Hans Åke
    kaplan, Alexander
    Fatigue Behaviour Study of Laser Hybrid Welded Eccentric Fillet Joints - Part I2009In: 12th NOLAMP proceeding 2009: Nordic Laser Materials Processing Conference / [ed] Erling Dam Mortensen, 2009Conference paper (Other academic)
    Abstract [en]

    Welded joints are a major component that is often responsible for causing a structure failure or for being the point at which fatigue cracking initiates and propagates. Despite tremendous research efforts, the understanding of fatigue behaviour is still limited, particularly for new techniques like laser hybrid welding. Beside a comprehensive state-of-the-art study, the paper presents a fatigue study of laser hybrid welded eccentric fillet joint of stainless steel of 10 mm thickness, with 5 mm displacement. Motivation is to study the influence of the surface geometry shape on fatigue performance under a four point bending test. 13 samples were produced, measuring the toe radii and testing under constant amplitude loading with stress ratio R=0. Different techniques have been used to measure local weld geometry, like plastic replica, a 3D optical profiler and a 3D-digitizer. The influence of the local weld geometry, like the toe radii, on the stress concentration was studied by FE-analysis. Occasionally lack of fusion was observed, which was taken into account in the FE-analysis. Based on the nominal stress approach, SN-curves were designed for laser hybrid welded eccentric fillet joints. Macro hardness tests were carried out and the crack surfaces were observed in order to detect crack initiation and propagation. Correlations between the toe radii, the corresponding stress maxima and crack initiation locations were studied between the different samples and even along the welds.

  • 22. Alfredsson, Ludvig
    et al.
    Fazl, Asade
    Lund, Katarina
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Integrated Product Development.
    Söderberg, Björn
    Product Development Management2011In: Entering the tigers cave – Perspectives on Japanese and Swedish Product Development / [ed] Bergsjö, Dag, Göteborg: Department of Product and Production Development, Chalmers University of Technology , 2011Chapter in book (Other (popular science, discussion, etc.))
  • 23.
    Allert, Anna-Lena
    KTH, School of Technology and Health (STH), Ergonomics.
    Att mäta lean-utveckling: En sammanställning av metoder för att mäta utveckling inom lean och en fallstudie på ett företag2011Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Lean produktion (LP) etablerades som begrepp i början av 1990-talet och har sedan dess spridit sig över världen och många företag vill i dag arbeta efter konceptet. Detta innebär att arbetsförhållanden för många arbetstagare påverkas och konsekvenserna för dem är inte helt klarlagda. Ett forskningsprojekt har inletts på STH/KTH för att undersöka hur arbetsförhållanden och hälsa påverkas över tid vid införande av LP. I detta projekt fanns därför ett behov av att kunna mäta eller uppskatta om någon utveckling kan relateras till införandet av LP och en önskan om en kartläggning av metoder som använts för att göra detta.Utifrån dessa behov blev syftet med föreliggande arbete att genom en litteraturstudie undersöka och sammanställa metoder som använts för att göra en bedömning eller skattning av ett företags utveckling inom lean. En intervjuguide skulle också testas gentemot resultatet av studien för att undersöka om effekter av en lean-implementering kunde synliggöras med hjälp av intervjuguiden och i vilken omfattning den täckte in de områden som kommit fram i litteraturstudien. Detta gjordes genom en fallstudie på ett företag som började arbeta med lean under 2007.För att ge en förståelse för lean produktion, historik och utveckling ges inledningsvis en beskrivning av konceptets historiska utveckling fram till och med i dag, tillsammans med dess begrepp, metoder och verktyg. Den begreppsförvirring som råder beskrivs och konsekvenserna av detta tillsammans med bristerna på en enhetlig definition av lean produktion tas upp. Av detta följer en viss problematik kring att mäta/skatta en utveckling inom lean vilken också diskuteras.Litteratursökningen resulterade i tolv olika metoder som presenteras kort tillsammans med de lean-faktorer som angetts. Med lean-faktor avses det område, faktor eller indikator som i metoden använts för att fånga upp en utveckling inom lean. Den faktor som togs upp av två eller flera metoder ansågs höra till de vanligaste. Totalt kunde 43 sådana identifieras. I dessa metoder kunde också sex olika systemkomponenter identifieras som berörda vid en lean-implementering i företaget.Som ett stöd vid mätning av lean-utveckling togs en utvecklingstrappa fram. Den användes i bedömningen av fallföretaget. Med hjälp av intervjuguiden framträdde en god bild av företagets arbete inom lean inom några områden. Med utgångspunkt i resultatet av litteraturstudien bör intervjuguiden kompletteras med frågor kring leverantörssamverkan, kunder och kvalitet för att analysen av ett företags lean-utveckling skall bli mer heltäckande.

  • 24.
    Almén, Lena
    et al.
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Larsson, Tore J
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Health and safety coordinators in building projects2014In: Built Environment Project and Asset Management, ISSN 2044-124X, Vol. 4, no 3, 251-263 p.Article in journal (Refereed)
    Abstract [en]

    Purpose – In order to reduce the number of injuries on construction sites, a European Directive prescribes that the clients shall appoint safety and health coordinators in their projects. The purpose of this paper is to find out who are appointed to be health and safety coordinators for the design and planning phase and what they do in order to prevent injuries on sites. Design/methodology/approach – Since the 1st of January 2009, there shall be a coordinator for the design and planning phase in Swedish construction projects. Telephone interviews were made with the coordinators in 42 Swedish building projects.

    Findings – The coordinators’ education and experiences varied widely, as well as their descriptions of their duties: no duties, administration and active injury prevention. The coordinators who were classified as most active had at least one additional leading role in the projects. Research limitations/implications – The study is qualitative for an increased understanding, not a statistical reflection of the coordinator population.

    Practical implications – The legislation needs to clarify whether the early conceptual phase of the project is included in the coordinator’s commission and whether she/he is supposed to participate in identifying, assessing and reducing risks through design changes. These clarifications will have an influence on when the coordinator should be appointed and what competence she/he needs. Originality/value – The study increases the understanding of how the health and safety coordinators of the planning and projecting phase of building projects perceive their mission and what factors, according to them, have an influence on what they do.

  • 25.
    Alsterman, Henric
    et al.
    KTH, Superseded Departments, Production Engineering.
    Barata, José
    Onori, Mauro
    KTH, Superseded Departments, Production Engineering.
    Evolvable Assembly System Platforms: Opportunities and Requirements2004In: The proceedings of the IMG04 conference / [ed] Rezia Molfino, 2004, 18-23 p.Conference paper (Refereed)
  • 26.
    Alsterman, Henric
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Onori, Mauro
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Definitions, Limitations and Approaches to Evolvable Assembly System Platforms2005In: Emerging Solutions for Future Manufacturing Systems: IFlP TC 5/ WG 5.5 Sixth IFlP International Conference on Information Technology for Balanced Automation Systems in Manufacturing and Services 27-29 September 2004, Vienna, Austria / [ed] Luis M. Camarinha-Matos, 2005, 367-378 p.Conference paper (Refereed)
    Abstract [en]

    Europe, as most other OECD areas, is confronted with major potential opportunities in the decades to come. Although often portrayed as threats, the symptoms being denoted in the European economy are, in fact, part of a shift in knowledge and technology infrastructures created by these trends. These current challenges being faced by manufacturing companies nowadays require production systems to become ever more responsive and agile. This is particularly relevant to micro-products, since manual assembly becomes impossible, rendering outsourcing strategies less effective if not deliberately negative. Furthermore, traditional approaches to R&D in this field no longer suffice to cope with the challenges imposed since these imply new business methods, continuous technological evolution, and the increased tendency towards networks of enterprises.

    To meet such demands there is a need for new rapidly deployable and affordable (economically sustainable) microassembly systems based on reconfigurable, modular concepts that would allow continuous system evolution and seamless reconfiguration. Furthermore, as will be detailed later, one of the required foundations to sustainable assembly system concepts lies within a new way of thinking and working: a methodology that could integrate the various aspects related to the life cycle of the production systems, with particular focus being placed on the re-engineering phase. This article will present some definitions, clarify the basic approach, and outline the serious requirements being posed by such a paradigm: Evolvable Assembly Systems.

  • 27. Alvizos, Emmanuel
    et al.
    Angelis, Jannis
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Economics and Management (Div.).
    Servitized capital goods offerings: Why should the customer accept?2012In: Proceedings of the 4th World Conference Production and Operations Management, 2012Conference paper (Refereed)
  • 28. Andemeskel, Filmon
    et al.
    Semere Tesfamariam, Daniel
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Model-based collaborative development of manufacturing and control systems2016In: International Journal of Industrial and Systems Engineering, ISSN 1748-5037Article in journal (Refereed)
    Abstract [en]

    This paper presents a collaborative model-based development method for a manufacturing system and its control system. The method is aimed towards improving the traditional manufacturing and control systems development approaches that are often done independently and in sequence. First the interactions and dependencies in the multi-disciplinary development process are identified. Depending on the desired the level of abstraction, a system is modelled in a discipline neutral modelling language from which domain specific models are automatically transformed to a language of a target modelling environment. These models are then used as a basis for further development by domain experts. As an illustrative case, SysML is used for modelling of a high level system concept of a manufacturing cell. The subsequent modelling, simulation and the associated verification, validation and control code generation steps are described.

  • 29.
    Andersson, Dan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Economics and Management (Div.).
    Bernhardsson, Martin
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Economics and Management (Div.).
    Offshore outsourcing to China: The suppliers' perspective on competitive priorities and the role of buyer-supplier interaction mechanisms2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    In the global business environment, outsourcing and offshore outsourcing are strategies forfirms to handle the increasing competition in their specific market segments by utilizing thecapabilities of other firms in order to gain competitive advantages. China has become animportant player on the global market and is an attractive country for Western firms’offshore outsourcing initiatives. Even though outsourcing and offshore outsourcing havebeen discussed in the literature for a long period of time, firms are still not able to reach andfulfill their strategic goals and many offshore outsourcing projects fail. The purpose of thisthesis is to deepen the existing literature regarding offshore outsourcing to China byconsidering the Chinese suppliers’ perspective on competitive priorities, which are thepriorities that firms organize the production by, in order to understand how the buying firmscan be more successful in the Chinese context and reach their strategic goals.

  • 30.
    Andersson, Karin
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Work environment, Lean and Agriculture2014In: PROCEEDINGS: 11th International Symposium on Human Factors in Organisational Design and Management & 46th Annual Nordic Ergonomics Society Conference: Volume I + II, IEA Press , 2014, 661-666 p.Conference paper (Refereed)
    Abstract [en]

    Lean has become the predominant management concept in industry, but its effect on the work environment is debated. Lean has now reached farms and garden nurseries. This paper aims to identify consequences for the physical and psychosocial work environment when Lean was applied in micro-businesses in the agricultural sector. Observations, a questionnaire and interviews were used as methods. It was concluded that the psychosocial work environment became more structured and less stressful. The physical work environment was partly improved by less transportation on the farm. However, consideration of the physical work environment was insufficient.

  • 31.
    Andersson, Oscar
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Welding Technology.
    Melander, Arne
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Welding Technology.
    General regression model for prediction of spot weld sizes2011In: International Congress on Advances in Welding Science and Technology for Construction, Energy and Transportation Systems, 2011Conference paper (Other academic)
  • 32.
    Andersson, Oscar
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Welding Technology.
    Melander, Arne
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Welding Technology.
    Statistical Analysis of Variations in Resistance Spot Weld Results in Laboratory and Production EnvironmentManuscript (preprint) (Other academic)
  • 33.
    Andersson, Oscar
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Welding Technology.
    Melander, Arne
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Welding Technology.
    Verification of the capability of resistance spot welding simulationManuscript (preprint) (Other academic)
  • 34.
    Andersson, Oscar
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Welding Technology.
    Melander, Arne
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Welding Technology.
    Verification of the Capability of Resistance Spot Welding Simulation for automotive process planningManuscript (preprint) (Other academic)
  • 35. Andrews, Evan Stuart
    et al.
    Barthel, Leif-Patrick
    Beck, Tabea
    Benoît, Catherine
    Ciroth, Andreas
    Cucuzzella, Carmela
    Gensch, Carl-Otto
    Hébert, Julie
    Lesage, Pascal
    Manhart, Andreas
    Mazeau, Pierre
    Mazijn, Bernard
    Methot, Andrée-Lise
    Moberg, Åsa
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Environmental Strategies (moved 20130630). KTH, School of Computer Science and Communication (CSC), Centres, School of Architecture and the Built Environment (ABE), Centres, Centre for Sustainable Communications, CESC.
    Norris, Greg
    Parent, Julie
    Prakash, Siddarth
    Reveret, Jean-Pierre
    Spillemaeckers, Sophie
    Ugaya, Cassia Maria Lie
    Valdivia, Sonia
    Weidema, Bo
    Guidelines for Social Life Cycle Assessment of Products.: Social and socio-economic LCA guidelines complementing environmental LCA and Life Cycle Costing, contributing to the full assessment of goods and services within the context of sustainable development.2009Report (Other (popular science, discussion, etc.))
  • 36.
    Andrén Meiton, Emelie
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Lagström, Marie
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Contactless Mobile Payments entering Europe: The contactless mobile payment ecosystem and potential on the European market2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Contactless mobile payments are a payment method done with a mobile phone and a contactless technology. Instead of paying with cash, a payment card or a cheque, a user can tap its mobile phone onto a terminal to pay.

    Across the globe, several markets have been embracing the need for new payment methods. In Asia, contactless mobile payments have been used since 2004. In some of the African countries, due to an insufficient banking industry, mobile payments have been the only electronic payment method. However, in Europe contactless mobile payments are still in their initial phase.

    The benefits of contactless mobile payments are that they are easier to use, faster and more secure. However, there are some implications. Firstly, the lack of standardisations regarding how the technology will work has led to an undefined ecosystem consisting of many stakeholders with different motives. Secondly, in order for contactless mobile payments to break significant ground the users need to change their existing payment methods and habits. This is a time consuming process, which will require consistency and patience.

    The research purpose of this thesis has been to define the contactless mobile payment ecosystem with its future potential on the European market. The research paradigm has been of an interpretive nature where the researchers’ interpretations on the information have been in focus. In order to answer the research purpose, an action research has been conducted, including an analysis the of Porter’s Five Forces model applied on the current contactless mobile payment ecosystem with its various stakeholders, the attendance at the annual NFC Congress in Austria as well as an experimental case study on Google.

    3The findings of the action research have resulted in new definition of the current contactless mobile payment stakeholder ecosystem. In this new definition of the ecosystem, the user has been defined as the strongest force, hence has been placed in the centre encircled by mobile network operators, banks, merchants and transit authorities. In the ecosystem handset manufactures, operating system providers, technology vendors, cash handling organisations, card networks, POS terminal manufactures and governmental bodies have also been represented.

    The vision of the case study on Google has been to present a market entry strategy for how Google could enter the European market of contactless mobile payments. The research resulted in a proposition that Google would enter the market in the following order; the UK, France, Turkey, Russia, Germany, Spain and Italy.

    The conclusions of the research have been that contactless mobile payments will cut across an entire ecosystem, but that the ecosystem at the moment is not fully defined. To achieve a competitive position, a stakeholder has to deliver an outstanding user experience that is interoperable within the whole European market.

    Key­words: Contactless mobile payments, near field communication (NFC), mobile payment ecosystem, payment ecosystem, Google, Android

  • 37.
    Angelis, Jannis
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Management.
    Lean and operational performance2005Report (Other academic)
  • 38.
    Angelis, Jannis
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Management.
    Strategic Management of Global Manufacturing Networks2015In: Production planning & control (Print), ISSN 0953-7287, E-ISSN 1366-5871, Vol. 26, no 13, 1162-1163 p.Article, book review (Refereed)
  • 39.
    Angelis, Jannis
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Economics and Management (Div.) (closed (20130101).
    Velanikov, Ivan
    Mairi, Macintyre
    McMahon, Michael
    Naybour, John
    Arkle, Sam
    Reverse servitisation2012In: Proceedings of the 5th European Operations Management Association Service Operations Management Forum, Cambridge, 2012Conference paper (Refereed)
  • 40.
    Archenti, Andreas
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    A Computational Framework for Control of Machining System Capability: From Formulation to Implementation2011Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Comprehensive knowledge and information about the static and dynamic behaviour of machine tools, cutting processes and their interaction is essential for machining system design, simulation, control and robust operation in safe conditions. The very complex system of a machine tool, fixture and cutting tools during the machining of a part is almost impossible to model analytically with sufficient accuracy. In combination with increasing demands for precision and efficiency in machining call for new control strategies for machining systems. These strategies need to be based on the identification of the static and dynamic stability under both the operational and off-operational conditions. To achieve this it is necessary to monitor and analyze the real system at the factory floor in full production. Design information and operational data can then be linked together to make a realistic digital model of a given machining system. Information from such a model can then be used as input in machining simulation software to find the root causes of instability.

    The work presented in this thesis deals with the static and dynamic capability of machining systems. The main focus is on the operational stability of the machining system and structural behaviour of only the machine tool, as well.

    When the accuracy of a machining system is measured by traditional techniques, effects from neither the static stiffness nor the cutting process are taken into account. This limits the applicability of these techniques for realistic evaluation of a machining system’s accuracy. The research presented in this thesis takes a different approach by introducing the concept of operational dynamic parameters. The concept of operational dynamic parameters entails an interaction between the structural elements of the machining systems and the process parameters. According to this concept, the absolute criterion of damping is used to evaluate the dynamic behaviour of a machining system. In contrast to the traditional theory, this methodology allows to determine the machining system's dynamic stability, in real time under operating conditions. This framework also includes an evaluation of the static deformations of a machine tool.  In this context, a novel concept of elastically linked system is introduced to account for the representation of the cutting force trough an elastic link that closes the force loop. In addition to the elastic link which behaves as a static element, a dynamic non-contact link has been introduced. The purpose is to study the non-linear effects introduced by variations of contact conditions in joints due to rotational speed.

  • 41.
    Archenti, Andreas
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Daghini, Lorenzo
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Österlind, Tomas
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Contactless excitation and response system for analysis of high precision rotor dynamic properties2013In: Laser Metrology and Machine Performance X: LAMDAMAP 2013 / [ed] Prof. Liam Blunt & Dr. Wolfgang Knapp, Bedfordshire, UK: euspen , 2013, 150-156 p.Conference paper (Refereed)
    Abstract [en]

    The spindle system is a critical part of a machine tool structure and its dynamic properties are important for the performance of the whole machining system. Currently the only way to extract the dynamic properties of a given structure is via experimental modal analysis. This approach, however, can only be employed on idle systems and is performed with the assumption that the dynamics of a system are independent of rotational speed. The latter assumption cannot be applied to spindle systems. This paper introduces a novel testing system for analysing machine tool spindles dynamic properties, consisting of real-time recursive estimation of modal and operational dynamic parameters, employed alongside a contactless excitation and response system. The presented approach allows analysing the spindle system condition and dynamic properties not only at discrete rotational speed intervals but also during continuous sweep of rotational speed.

  • 42.
    Archenti, Andreas
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Maffei, AntonioKTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.
    Proceedings of the International Conference on Advanced Manufacturing Engineering and Technologies2013Conference proceedings (editor) (Refereed)
  • 43.
    Archenti, Andreas
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Nicolescu, Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    A top-down equivalent stiffness approach for prediction of deviation sources in machine tool joints2017In: CIRP annals, ISSN 0007-8506, E-ISSN 1726-0604Article in journal (Refereed)
    Abstract [en]

    The accuracy of machine tools is affected to a large extent by the behavior of the system's joints. In this paper the equivalent stiffness approach identifies and calculates the contribution of joint error sources to the total deviation measured between toolholder and workpiece under loaded conditions. The force–deviation functions are measured at different locations in the machine workspace. Joint deviations are then computed and compared with results obtained from measurements. The results show the effectiveness of the proposed method in determining joint errors in machines.

  • 44.
    Archenti, Andreas
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Nicolescu, Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Nonparametric identificationof stiffness and damping in nonlinear machining systems2013In: / [ed] Andreas Archenti, Antonio Maffei, 2013, 317-327 p.Conference paper (Refereed)
    Abstract [en]

    The demand for enhanced performance of production systems in terms of quality, cost and reliability is ever increasing while, at the same time, there is a demand for shorter design cycles, longer operating life, minimisation of inspection and maintenanceneeds. Experimental testing and system identification in operational conditions still represent an important technique for monitoring, control and optimization. The term identification refers in the present paper to theextraction of information from experimental data and is used to estimate operational dynamic parameters for machining system. Such approach opens up the possibility of monitoring the dynamics of machining system during operational conditions, and to be used for control and/or predictive purposes

  • 45.
    Archenti, Andreas
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Nicolescu, Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Casterman, Guillaume
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Hjelm, Sven
    A new method for circular testing of machine tools under loaded condition2012In: Fifth CIRP Conference On High Performance Cutting 2012 / [ed] Konrad Wegener, Elsevier, 2012, 575-580 p.Conference paper (Refereed)
    Abstract [en]

    This paper presents a novel test device for the evaluation of the accuracy of machine tools. The design concept is similar to a double ball bar (DBB) with the difference that an adjustable load generated by the device can be applied between spindle nose and machine tool table. The device, called Loaded Double Ball Bar (LDBB), can be used either as an ordinary double ball bar system with no load applied to the structure, or with a predefined load applied to the structure. The load that is generated by the LDBB is generally not equivalent to real cutting forces. However, from the static deflection point of view the effect of the load on the machine tool structure has similar impact on the static behaviour of the system. For instance, the load can in some cases eliminate existing play in ball screws, plays that under normal machining condition will be eliminated by the effect of cutting forces on the structure. With the help of this test device, not only can the identifiable errors by an ordinary DBB be evaluated but also machine tool elastic deflection in different directions. It is also possible to track different error patterns to the applied load.

  • 46.
    Archenti, Andreas
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Nicolescu, Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Lundholm, Thomas
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Virtual Machining System Engine for Simulation of Process Machine Interaction2012In: Modern Machinery Science Journal, ISSN 1803-1269, Vol. March, 310-314 p.Article in journal (Refereed)
    Abstract [en]

    The aim of this paper is to introduce a novel methodology, based on a finite element (FE) computation engine for simulation of process machine interaction occurring in machining systems. FE modelling of the milling process has the purpose of being accountable for a thorough validation of the parametric identification approach, and of providing a good physical insight into the phenomena investigated. The system considered here has a lower number of degree-of-freedoms which permits a thorough analysis. However, when taking into account the system’s nonlinear and time-varying nature, it is apparent that the results are far from being trivial. Therefore, the analysis of the milling process, taking into account nonlinearities restricting the growth of response amplitudes in the case of chatter-type instability, provides some intrinsic information of the basic features on the system that might be of both fundamental interest and practical use.

  • 47.
    Archenti, Andreas
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Österlind, Tomas
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Nicolescu, Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Evaluation and Representation of Machine tool Deformations2011In: Journal of Machine Engineering, ISSN 1895-7595, Vol. 11, no 4, 118-129 p.Article in journal (Refereed)
    Abstract [en]

    This paper presents a novel test concept for the evaluation of the accuracy of NC machine tools. The evaluation of machine tools deformations is performed by help of a device similar to the double ball bar (DBB) with the difference that an adjustable load generated by the device can be applied between spindle nose and machine tool table. This load eliminates the play existing in machine tool joints, thus reproducing the testing conditions that exist during machining. Collected data are used to plot diagrams displaying characteristic aspects of achine tool performance and a number of key figures such as static stiffness may be etermined. The data can also be used for trend analysis; to predict any accuracy deviations, and further to conduct preventive maintenance instead of emergency calls. The determined static behaviour could also be used to improve digital models for process simulations and compensation of errors that are caused by deflection.

  • 48.
    Are, Josephine
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Management.
    Bhola, Robin
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Management.
    Managing misalignments in complex production flows: A way to integrate shared interfaces by adjusting infrastructural decision areas2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Acceleration of technological development has resulted in increased customer requirements. Momentarily customer demand fluctuates that creates uncertainties, which puts pressure on manufacturing companies to respond and incorporate this into the manufacturing strategy to stay competitive. Additionally, manufacturing companies experience complexities with non-linear production flows that share interfaces. Research in manufacturing strategy is more focused on traditional linear production structures and flows. Thus, the objective of this thesis to analyze integration of shared interfaces between non-linear production flows.

    Empirical research was conducted in form of a single case study at a production facility of a manufacturing company, to fulfill the thesis objective. The ambition of the case company is to improve the handling of semi-finished products to achieve an increased efficiency. Interviews, observations, analysis in product profiling by Hill et al. (1998) have resulted in that infrastructural misalignments are considered as major aspects affecting integration of shared interfaces. Further, issues regarding the management of infrastructural aspects are found through in-depth interviews, workshop and analysis. Adjustments to these issues have to be considered to achieve an efficient integration of shared interfaces between production flows.

    This thesis contributes within the area of manufacturing strategy and infrastructural decision areas. A contribution within this area is the extension of the product profiling framework usage with a comparative analysis of production flows with the considered dimension of shared interfaces. The comparative analysis showed that there were misalignments between aspects that were shared interfaces in the complex production flows. Furthermore, integration of shared interfaces is seen as a way for manufacturing companies to decrease production complexity and increase responsiveness to respond to market requirements.

  • 49. Aronsson, Gunnar
    et al.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Ergonomics.
    Randle, Hanne
    Svensson, Lennart
    Inte bara här och nu utan också där och då: Reflektioner om arbetslivsforskningen och det stora hållbarhetsprojektet2009In: Arbetslivsforskning och hållbarhet: Arbetsliv i omvandling / [ed] I: Porsfelt, Växjö: Växjö universitet , 2009, 1Chapter in book (Other academic)
  • 50.
    Aue, Gabriela
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy and Climate Studies, ECS.
    The Possibilities for Biogas in Bolivia: Symbioses Between Generators of Organic Residues,  Biogas Producers and Biogas Users2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This master thesis investigates the potential use of biogas from organic residues in the area of the cities of La Paz and El Alto in Bolivia. The two cities have currently a contamination problem and biogas emerges as opportunity for both waste management and energy generation. There are approximately 274 500 tonnes/year of residue that can be used to produce biogas. This amount of residue can generate approximately 33,500,000 m3 of biogas. The advantages and disadvantages of five different digester types (the smaller tubular digester, the fixed dome digester, the floating drum digester and the bigger German AEV digester and a Swedish digester) were investigated to see if they could be an option for use in Bolivia. The German AEV digester is better when compared to the Swedish unit from Flotech in case a larger biogas digester would be implemented. Among the smaller digesters, the tubular digester already has access to the necessary resources and knowledge, and they can be operated at a cheap price. The fixed dome digester and the floating drum digester are  not used in Bolivia at present, and there is no knowledge in the country about how to implement them.  There are technical, social and economic issues related to an eventual installation of a big digester in Bolivia including transportation logistics and costs, how to motivate the population to sort out the different residues, and also the state subvention of natural gas production that lowers the price of biogas required to make it competitive. To see if it is economically viable to build a functional biogas generator for this area, economic data were compared. The analysis shows that the fixed dome and floating drum digester are much better economic investment than the tube digester. The bigger digesters are economically viable without financial aid if there is a market for the by- product fertiliser in Bolivia. The data for this analyse also shows that the conditions that exist today in Bolivia make it economically viable to invest in a bigger digester but only the fixed dome and the floating drum digester are economically viable without a market from the fertiliser

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