kth.sePublications
Change search
Refine search result
123 51 - 100 of 120
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 51.
    Johansson, Mattias
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Information Management for Manufacturing System Development2001Doctoral thesis, monograph (Other scientific)
    Abstract [en]

    In the development of products the actual product design isnot an isolated occurrence solely providing the definitionalinformation needed to realise information into physicalproducts. There is also a need to develop and design themanufacturing process and manufacturing system that is to beused in the transformation of information into a physicalproduct. Integration of the design processes of products,processes and manufacturing systems has become important toeffectively transform knowledge into physical products. Thisdevelopment process is under a constant pressure to deliverhigher quality information in a shorter time than before. Thedrive for perfection has also forced industry to focus on thisspecific area of expertise and cooperate with partners in orderto have a complete coverage of all aspects in the productdevelopment.

    The last decade has shown a significant increased use ofcomputer applications within industry for an exact andefficient information creation. The use of computerapplications however, has not been as successful as intended.One major reason for this is due to problems in informationmanagement and communication issues were sharing of informationbetween computer applications has been a major obstacle.

    The research presented in this thesis focuses on the use ofstandardised information models as a base for an informationsystem supporting integrated design of products, processes andmanufacturing systems. The use of standardised informationmodels is key to communication and sharing of information amongcomputer applications. The development of these informationmodels has until now had a product design focus and theinformation concerned with the design of manufacturing systemshas not yet been addressed.

    In this thesis the design information of manufacturingsystems have been studied and used for the definition of aninformation model enabling communication of information amongcomputer applications used for manufacturing system design. Thedefinition of the information model has had a holistic approachwhere the integrated information management for design anddevelopment of products, processes and manufacturing systemshave been considered.

    This thesis has studied the ISO10303, STEP, standard anddefines the use of ISO10303-214 for the design information ofmanufacturing systems. This definition allows for therepresentation of integrated product, process and manufacturingsystem information through the use of one information model.This research has proposed changes to the ISO10303-214 standardin order to represent the integrated information from early todetailed design and had these changes accepted.

  • 52.
    Johansson, Roger
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Implementation of Flexible Automatic Assembly in Small Companies - Flexibility and Process demands2002Doctoral thesis, monograph (Other scientific)
    Download full text (pdf)
    FULLTEXT01
  • 53.
    Jonsson, Alex
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Methods and techniques for enhancing on-line publishing workflows1998Licentiate thesis, comprehensive summary (Other scientific)
  • 54.
    Jonsson, Axel
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Covering spectator events for a remote audience using web-based technologies1998In: Proceedings of the European multimedia, microprocessor systems and electronic commerce conference, 1998, p. 102-110Conference paper (Other academic)
  • 55.
    Jonsson, Axel
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Event driven digital publishing workflows2000In: TAGA Proceedings, 2000, p. 465-474Conference paper (Other academic)
  • 56.
    Jonsson, Axel
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Producing distributed education for the corporate intranet1998In: Proceedings of the european multimedia, microprocessor systems and electronic commerce conference, 1998, p. 294-300Conference paper (Other academic)
  • 57.
    Jonsson, Axel
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Study of the in-house deployment of a distributed education service for the corporate intranet2001Conference paper (Other academic)
  • 58.
    Jonsson, Axel
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Techniques for arranging a global seminar for a large audience1999In: Business and work in the information society: new technologies and applications / [ed] Stanford-Smith, Brian., Kidd, Paul T., Roger, Jean-Yves, IOS Press , 1999, p. 271-277Chapter in book (Other academic)
  • 59.
    Jonsson, Axel
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Enlund, Nils
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Multichannel publishing and automated updating of online newspapers1995In: TAGA Proceedings, 1995, p. 649-665Conference paper (Other academic)
  • 60.
    Kaiserfeld, Thomas
    KTH, Superseded Departments (pre-2005), Production Engineering. KTH, School of Architecture and the Built Environment (ABE), Philosophy and History of Technology, History of Science and Technology.
    Vetenskap och karriär1997Doctoral thesis, monograph (Other scientific)
    Abstract [sv]

    This study concerns the conditions for research. Above allit deals with the professional and institutional situation of physicists in Sweden during the first half of the twentiethcentury. The starting point is the altered career opportunities for physicists in industrialised society. Their workingconditions were influenced by the social and economic changesof the time. Moreover, the study focuses upon the links betweencareer paths and institutional environments among the 98physicists who published their doctoral theses in Swedenbetween 1890 and 1929. This means thatthe focus is on accessto resources rather than on the production of knowledge.Relatively little attention is given to the conceptual contentsof theories in physics or the practical execution ofexperiments.

    The analysis is inspired by the kind of socio-historicalperspective of the history of science which is generallyassociated with the American social scientist Robert K. Merton.Here the concepts of institutionalisation andprofessionalisation are often used to characterise alteredconditions for scientific research. In this study however, ithas been seen as more fruitful to use the concept of careerpath to describe the circumstances of Swedish physicists'professional conditions as lecturers, professors and industrialresearchers during the first half of the twentieth centuryEqually, the concept of institutional environment has beenemployed to study their institutional conditions in secondaryschools, universities, industrial laboratories, and researchinstitutes. The different career paths and institutionalenvironments has then been linked and analysed by the conceptsof research ideals and research resources.

  • 61.
    Karlsson, Anders
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Assembly-initiated production: A strategy for mass customisation withshort lead-timesi2001Licentiate thesis, monograph (Other scientific)
  • 62.
    Karlsson, Anders
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Developing high performance manufacturing systems2002Doctoral thesis, monograph (Other scientific)
    Abstract [en]

    The work detailed in this dissertation relates to thedevelopment of high performance manufacturing systems. Theperformance factor aimed for is especially flexibility, butthere is an intention of making the results adaptable to focuson performance factors of the readers or users choice. Thefocus of the presented research is not only to provide meansfor accomplishing manufacturing that can handle changes butalso to accomplish flexibility in another area. The resultsshould be applicable in many different situations. The researchhas been divided into three parts: the further development of amanufacturing strategy, the development of a base for amanufacturing system design method and the development of amanufacturing control system.

    The developed strategy is called Assembly-InitiatedProduction (AIP). An implementation of the strategy shouldprovide high manufacturing system flexibility but at the sametime contribute to the lowering of inventory levels andlead-times. Different solutions coupled to technicalrequirements found are also discussed.

    The design method research focuses on basic manufacturingsystem properties and the possibility of expressing theseproperties by using simple combinable abstract units calledconcepts. The principle is the same as in physics where realworld phenomena may be expressed by using standard concepts asfor example time and mass. The intended use of the results isin an early manufacturing system design phase. The method isnot directly linked to the AIP strategy, but could be used forimplementing it.

    Production Planning and Control (PPC) is an important partof a manufacturing system. After having reviewed current PPCpractices, a need for a factory floor PPC system workingregardless of factory floor layout, was identified. Based ontheoretical and industrial studies, the suggested solution is acomputerised, decentralised control system, physicallyseparated from the PPC/ERP system. In order to be able to makequick changes in the schedule, to obtain flexibility and toprovide the organisation with a tool for manufacturing controland decision-making, the system works in real time to provideaccurate and valid data.

    Download full text (pdf)
    FULLTEXT01
  • 63. Karlsson, K
    et al.
    Tesfamariam Semere, Daniel
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Manufacturing strategy linked to manufacturing system flow principle2004In: Proceedings of the 7th CIRP International Seminar on Manufacturing Systems (ISMS:2004), Digital Enterprises, production network 2004, 2004Conference paper (Other academic)
  • 64.
    Karlsson, Kenneth
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Systematic design of competitive producction systems2004Licentiate thesis, monograph (Other scientific)
    Download full text (pdf)
    FULLTEXT01
  • 65.
    Kivineva, Esa
    KTH, Superseded Departments (pre-2005), Production Engineering.
    The Influence of Composition and Hot Processes on Heat Affected Zone and Weld Metal Behavior and Mechnacal Properties of Ti Grade 5 and Stainless Steel2004Doctoral thesis, comprehensive summary (Other scientific)
    Abstract [en]

    This thesis discusses on results of experiments carried outwith austenitic, duplex and super duplex stainless steels andTi-6Al-4V. In these it has been seen that the heat cycle duringwelding or weld simulation has a great effect on the propertiesof thematerials. The properties are related to the resultedgrain size after processing, as well as, to the chemicalcomposition of the material. The thesis discusses on the grainsize resulted after hot processing and how the properties areinfluenced by it. Also, it has been seen how large grain sizeinfluences the fracture toughness of the duplex stainlesssteel. The CTOD values become so low that an alternativeproduction method should be used instead of casting. The thesisdescribes the behavior of grain size in the hot processing ofTi-6Al-4V and impact toughness resulted by various weldingprocesses. The thesis shows correlation between grain growthbehavior of metallurgically different materials, i.e. duplexstainless steel, Ti-6Al-4V and quenced and tempered low alloysteel.

    Keywords:Stainless steel, Duplex Stainless Steel,Titanium Grade 5, Ti-6Al-4V microstructure, mechanicalproperties, welding, welding simulation

    Download full text (pdf)
    FULLTEXT01
  • 66.
    Larsson, Annika
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Capability in machining systems2002Licentiate thesis, monograph (Other scientific)
    Abstract [en]

    The vehicle industry has derived a vision of simulatingmachining systems and their cutting processes with accuracy andcapability indices as a result. The accuracy of machined partsis the result of properties and characteristics of the totalmachining system and its environment. Natural deviation resultsin deviations between each machined part which in turn effectthe functionality of an assembled product.

    A machining system is defined as consisting of the fivemodules: machine tool, tool, cutting process, workpiece andfixture.

    The thoughts and discussions about the vision of simulatinga machining systems and its environment have resulted in aresearch question:“What is required to give a reliablesimulated value of capability and accuracy?"

    Being able to predict the accuracy of machined parts in aspecific machining system and its environment gives thepossibility of optimising the cutting process and detect errorsin the machining systems. It also gives the possibility todesign more robust machining systems and avoid mistakes duringthe designing of the machining systems.

    This study has shown that to be able to predict capabilityindices for both existing and future machining system it isnecessary to have thorough knowledge in four areas; capabilityas a statistical tool, accuracy in machining system,measurement tools and methods, and modelling andsimulation.

    To achieve a reliable capability index, the capability studyhas to be properly planned, performed and evaluated. Thestatistical method of capability indices needs to be well-knownwhen choosing index, comparing different indices and whenmaking comparisons between indices from several machiningsystems.

    The machining accuracy of a machining system is dependent onfour groups of characteristics: temperature influence, geometryand kinematics, static stiffness and, finally, dynamicstiffness.

    There are a great number of models available for cuttingprocesses, process state variables and different modules of amachining system. Usually, these models can only be useddiscretely since there is almost no relationship between thestructures, required data and assumptions of the models. It istherefore not yet possible to model and simulate a machiningsystem to achieve a reliable accuracy value.

    Download full text (pdf)
    FULLTEXT01
  • 67.
    Larsson, Christer
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Stemne, D.
    A-plasma: Use of penetration flux and the plasma process when pipe welding type 316L of thicker dimensions2004Conference paper (Refereed)
    Abstract [en]

    The maximum penetration depth in inert shielded gas processes as TIG (≤ 3 mm) and keyhole plasma (≤ 8 mm) limit a highly weldable corrosion resistant alloy as the standard austenitic stainless steel 316L to be welded autogenously in dimensions above these maximum penetration depths. Thus an expansion of these penetration ranges would expand the selection of autogenously welded pipes classified by ASTM A312. Also an increase of the productivity rates in pipe welding of thicker dimensions due to less extensively preparations and welding procedures would be a benefit. Using an activated flux to achieve deeper penetration in the TIG process (A-TIG) is today a well-known and established method. In keyhole A-plasma is, however, limited research performed and the use of an activated flux in connection with the partial penetration plasma process is still not evaluated. In the present paper a discussion of different proposed mechanisms affecting the penetration characteristics is made. The experimental procedures when using flux constituents of oxides as SiO2 and TiO2 in connection with the keyhole plasma process and the partial penetration plasma process are also described. A maximum depth in partial penetration A-plasma of 15 mm has been achieved. This is an improvement of 4 times compared with the ordinary partial penetration plasma process. The depth to width ratio became in this case 1.00, which increased the ratio about 7 times. The longitudinal seem welding using two-sided partial penetration A-plasma is limited by the demands of a good groove fitting but a new process for girth welding in thicker dimensions (t ≤ 25 mm) of type 316L is achieved. The keyhole A-plasma process is not recommendable due to the narrow parameter box that changes the non-penetration mode to a cutting mode too abruptly.

  • 68.
    Larsson, Mattias
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Kjellberg, Torsten
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Human resource skill management in company networks2004In: Proceedings of the 4th International Conference of DAAAM National Estonia / [ed] Papstel, J; Katalinic, B, TALLINN: DAAAM NATIONAL TALLINN, TALLINN TU , 2004, p. 253-256Conference paper (Refereed)
    Abstract [en]

    In this paper a model for human resource skill management is introduced The idea is to support human resource management, knowledge management and production management with a detailed skill model. For that purpose a brief literature study was performed to position the model against these emerging management theories. Based on the findings in the study it was then possible to investigate how this type of models should be designed. In order to capture domain specific knowledge it is suggested to use an ontology based model architecture. The paper also discusses the first test of this concept. In this test an information model was implemented in the so called INNOMET advisory system, a system for human resource knowledge management.

  • 69.
    Lundholm, Thomas
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Bergström, Erik
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Enarson, Daniel
    Harder, Lars
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Lindström, Bo
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Nicolescu, Mihai
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Nilsson, Bruno
    KTH, Superseded Departments (pre-2005), Production Engineering.
    NEW TECHNIQUES APPLIED TO ADAPTIVE CONTROLLED MACHINING1992In: Robotics and Computer-Integrated Manufacturing, ISSN 0736-5845, E-ISSN 1879-2537, Vol. 9, no 4-5, p. 383-389Article in journal (Refereed)
    Abstract [en]

    The future capital intensive CIM and FMS systems will demand adaptive controlled (AC) machine tools. At the Department of Production Engineering of the Royal Institute of Technology in Stockholm (IMT/KTH) we are continuing the development of an advanced AC turning center. Our approach is to design and use sophisticated sensor systems to measure several features both on-line and off-line in order to obtain sufficient information on the cutting process and make adaptive feedback feasible. The AC system operates at three different levels: advanced process monitoring adaptive control constraint (ACC) adaptive control optimization (ACO). In this paper we give an overview of practical progress and improvements that have been achieved since our contribution to MSTF '87 in Cambridge.1 This includes: a new flexible sensor installation for optical tool wear measurements on-line tool wear estimation based upon a dynamic force sensor applied time series analysis for on-line chatter control real-time control of maching conditions with respect to cutting forces distributed real-time computer system solution.

  • 70.
    Lundholm, Thomas
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Yngen, Magnus
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Lindström, Bo
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Advanced Process Monitoring - A Major Step Towards Adaptive-Control1988In: Robotics and Computer-Integrated Manufacturing, ISSN 0736-5845, E-ISSN 1879-2537, Vol. 4, no 3-4, p. 413-421Article in journal (Refereed)
    Abstract [en]

    Adaptive Control (AC) of machine tools requires many kinds of measured input data. The more information about the complex metal cutting process that can be obtained, the better the process can be controlled.

    The paper describes an Adaptive Control Optimization (ACO) system for turning operations. The system continuously chooses Optimal Cutting Data (OCD), taking into account both economical criteria and technical limitations.

    The system operates at three different levels:

    • • Advanced Process Monitoring

    • • Adaptive Control Constraint (ACC)

    • • Adaptive Control Optimization (ACO).

    Two commercial monitoring systems perform process monitoring. In addition, five independent measurement systems have been developed.

    A dedicated vision system has been installed in the lathe to measure the tool flank wear between cuts. The flank wear data are utilized to predict the tool life. Based upon these predictions economical optimum cutting data can be calculated at the ACO level.

    To obtain in-process real-time control of the metal cutting process the cutting forces are measured during machining. The forces are measured with conventional piezoelectric force transducers which are located between the turret housing and the cross-slide. The measured force signals are processed by a dedicated microcontroller at the ACC level and cutting data adjustments are fed back to the machine control.

    A vibration measurement system, which either can be connected to an accelerometer or use the dynamic force signal from the piezoelectric force transducer, is part of a vibration control module at the ACC level. An ultra-fast signal processor performs the signal analysis.

    The remaining two measurement systems—a high frequency tool signal analysis system and a power spectra analysis system—are mentioned in the paper but not further discussed.

    Finally, the paper deals with how the strategies at the three different levels will be combined, in order to form an AC system. The monitoring tasks will always reside in the background and be activated if any failure occurs. The ACO subsystem will act as a path-finder and suggest cutting data. The active control tasks will, however, be carried out at the ACC level.

  • 71. Luo, C. H.
    et al.
    Ståhlberg, Ulf
    KTH, Superseded Departments (pre-2005), Production Engineering.
    An alternative way for evaluating the deformation of MnS inclusions in hot rolling of steel2002In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 31, no 3, p. 184-190Article in journal (Refereed)
    Abstract [en]

    The behavior of MnS inclusions during flat hot rolling of steel has been studied. Experiments were carried out in a four-high mill. The workpiece was up to a nominal reduction in height of 85% in four passes, at rolling temperatures of 700-1200degreesC with interpass reheating. The relative plasticity and orientation of inclusions were quantitatively assessed by means of an image-processing tool. Finite element analyses were performed in order to scrutinize the concept of 'relative plasticity', which is based on dimensional change of the inclusion, Furthermore, inclusion reorientation is discussed.

  • 72. Luo, C. H.
    et al.
    Ståhlberg, Ulf
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Deformation of inclusions during hot rolling of steels2001In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 114, no 1, p. 87-97Article in journal (Refereed)
    Abstract [en]

    The deformability of inclusions during hot working of steels influences the final properties of the product. In the present work the inclusion behavior in flat hot rolling has been studied by using a developed rigid-viscoplastic finite element code. The analysis is based on the mesomechanical approach. This method connects the micromechanical behavior of the heterogeneous material with its in-service macroscopic behavior. The macro-model evaluates the deformation history throughout each sub-volume of the material without taking the influence of inclusions into account. The micro-model that includes inclusions makes use of the deformation history from the macro-model as boundary values. Thus a micro-model cell element is constructed to analyze the behavior of an inclusion. The cell element is subjected to the same deformation history as that inside a macro-model element. The influences of process parameters, such as rolling temperature, rolling reduction and friction at workpiece/roll interface, are investigated. The relative plasticity index of a silicate inclusion was found to be heavily dependent on the process parameters. The index got high values for high temperatures, low rolling speeds and rolling schedules built on small reduction/pass. Some results are consistent with existing experimental observations. Also the influence of friction, at the workpiece/roll interface, on the profile of the inclusion has been analyzed.

  • 73.
    Luo, Chunhui
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Modeling the behavior of inclusions in plastic deformation of steels2001Doctoral thesis, comprehensive summary (Other scientific)
    Abstract [en]

    This doctoral thesis presents a modeling method fordemonstrating the behavior of inclusions and their surroundingmatrix during plastic deformation of steels.

    Inclusions are inescapable components of all steels. Moreknowledge about their behavior in processes such as rolling andforging is necessary for carrying out the forming processes ina more proper way so that the properties of the final productare improved. This work is focussed on deformation ofinclusions together with void formation at the inclusion-matrixinterface. The topic of the work is analyzed by differentFE-codes.

    The relative plasticity index is considered as an importantmeasure for describing the deformability of inclusions. Theindex could be analyzed quantitatively, enabling a deeperunderstanding of the deformation mechanisms. The workingtemperature is found to be an important process parameter. Thisis very clear when the deformation of silicate inclusions in alow-carbon steel is studied during hot rolling. Here a narrowtransition temperature region exists, meaning that theinclusion behaves as non-plastic at lower temperatures and asplastic at higher. The results are in agreement withexperiments published by other authors.

    Regarding void formation, the simulations have been carriedout by utilizing an interfacial debonding criterion. Thedifference in yield stress between the matrix and the inclusionis one common reason for void initiation and propagation.During large compressive deformation the evolution of voidsgoes through a sequence of shapes, from convex with two cuspsto concave with three cusps together with self-welding lines.It is concluded that the formation of voids is alwaysassociated with a large relative sliding between the inclusionand the matrix.

    In order to study the local behavior of the material closeto inclusions during hot rolling a mesomechanical approach isused. Uncoupled macro- and micro- models have been developed.By means of the macro-model, the stress-strain historythroughout each sub-volume of the steel is evaluated. Thestress components or velocity fields are recorded with respectto time as history data. No consideration is taken to theexistence of inclusions. The micro-model, which includes bothinclusion and steel matrix, utilizes the stress components orthe velocity fields from the macro-model as boundaryconditions.

    Keywords: Inclusion; Steel; Plastic deformation; Void;Rolling; Forging; Finite Element; Mesomechanical approach.

    Download full text (pdf)
    FULLTEXT01
  • 74.
    Moestam Ahlström, Lena
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Prerequisites for Development of Products Designed for Efficient Assembly - a Study about Making Knowledge Productive in the Automobile Inustry2002Doctoral thesis, comprehensive summary (Other scientific)
    Abstract [en]

    This thesis deals with the development of the competence tocreate assembly efficient products. The assembly-relatedknowledge that is resident within an organisation is ofinestimable value and should be used, refined and developed inorder to obtain assembly efficient products. The question ishow competence development can be promoted organisationally.This thesis has adopted the working hypothesis thatmodularisation promotes competence in the development ofassembly efficient products. This position is based on theliterature regarding competence development,competence-promoting organisations, and concurrentengineering.

    The empirical research reported in this thesis is along-term case study carried out at Volvo Car Corporation. Inthe licentiate thesis that preceded this doctoral thesis, itwas suggested that assembly work should be based on modules.The further topics researched in this thesis includeexamination of a modularisation process, examination of thecommunication interface between the assembly organisation andthe product development organisation, the effects ofmodularisation on the assembly process, and an investigation ofthe development of two assembly efficient products.

    The product of the research is a model representing theorganisational prerequisites for developing competence in thecreation of assembly efficient products. The key elements inthe model are a transparent organisational structure, clearintention in the organisation, and accommodation ofcross-functional exchange. Modularisation is a means ofcreating a transparent organisational structure that makes itpossible for members of the organisation to understand thecontext in which they work, which is a basic requirement fordeveloping competence. A structure for cross-functionalcooperation should be put in place to facilitatecross-functional exchange and learning. To succeed indeveloping assembly efficient products, an organisation mustalso clear signal that this is its intention. Visions, goalsand strategies must express this ambition. Only then will themembers of the organisation have the mindset that enables themto use their full potential to develop competence in creatingassembly efficient products.

    Keywords:competence-promoting organisation, transparentorganisation, modularisation, assembly efficiency, automobileindustry

    Download full text (pdf)
    FULLTEXT01
  • 75.
    Mårtensson, Pär
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Almström, Peter
    Ylipää, Torbjörn
    Reliability and Maintainability Consequences of Couplings inManufacturing Systems2002In: Proceedings of 35th CIRP International Seminar on ManufacturingSystems, Seoul, Korea, 2002, 2002Conference paper (Refereed)
  • 76.
    Mårtensson, Pär
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Fagerström, Jonas
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Product Function Independent Features in Axiomatic Design2000In: Proceedings of the First International Conference on AxiomaticDesign, ICAD 2000, June 21 – 23 June 2000, MA, USA, 2000Conference paper (Refereed)
  • 77.
    Mårtensson, Pär
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Fagerström, Jonas
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Nielsen, Johan
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Co-operative digital projecting of manufacturing equipment – method and implementation based on STEP and XML2002In: Proceedings of the 33rd International Symposium on RoboticsArticle in journal (Refereed)
  • 78.
    Mårtensson, Pär
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Tate, Derrick
    Reuse of Design Rationale in Cellular Manufacturing Systems:Theory and Application1998In: Proceedings of the 2nd Conference on Engineering Design andAutomation, ED&A ´98, HI, USA, 1998, 1998Conference paper (Refereed)
  • 79.
    Mårtensson, Pär
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Wyns, Jo
    Peeters, Patrick
    Neuhaus, Jörn
    Johansson, Annika
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Minimising the impact of changes and disturbances on manufacturingsystem performance2000In: International Journal on Studies in Information and Control, Vol. 9, no 2Article in journal (Refereed)
    Abstract [en]

    Shorter product life cycles and global competition require manufacturing companies to be much more dynamic. As a consequence, their manufacturing systems are subject to frequent changes (e.g. the introduction of new product variants) and disturbances (e.g. fluctuating demand). Manufacturing systems have to be able to quickly respond to this in order to minimise the impact of disturbances and changes on the manufacturing performance.

    The aim of this paper is to raise a profound awareness on the mutual constraints that product design, equipment design, and control logic design put upon each other. The paper lists design guidelines to relax these constraints and thereby increase the ability to handle disturbances and unforeseen changes.

  • 80.
    Nielssen, Johan
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Information modeling of manufacturing processes2003Doctoral thesis, monograph (Other scientific)
    Abstract [en]

    The innovation process is an important process for our primemotor of welfare, manufacturing. During this process, theprerequisites for manufacturing are set. To set the bestpossible prerequisites consideration about products,manufacturing processes, and manufacturing resources must bemade concurrently, which also means involving several differentdisciplines in a collaborative effort.

    As a consequence of involving different disciplines, thecommunication of engineering information may be hindered. Thereason is that different disciplines use different terminologyfor the same concept and sometimes have the same terminologyfor different concepts. This may result in difficultiesunderstanding each other, which may, in turn, result inunnecessary loss of quality and productivity.

    The main objective of this thesis is to identify informationconcepts (i.e. information requirements) for process planningin a concurrent engineering environment, and to formally definethe corresponding terminology. The work is based on casestudies at Volvo Car Corporation, involving management of weldspot and location system information, and at ABB Body-in-White,involving tender preparation information.

    The results are presented in the thesis in terms of aninformation model, the Product-Process-Resource (PPR)information model, and two corroborated hypotheses. The PPRinformation model defines the identified informationrequirements in the scope of the thesis whereas the hypothesesconcern how, e.g., modularization can be used in informationmodeling.

    The PPR information model provides the base for aninformation platform in a concurrent engineeringenvironment.

    The PPR information model enable model based documentationand, thus, traceability of the evolution of the product,process, and manufacturing resource designs, and theirinterrelations.

    Keywords:Information Modeling, Process Planning,Concurrent Engineering, Information Management

    Download full text (pdf)
    FULLTEXT01
  • 81. Nilsson, B.
    et al.
    Carlsson, Torgny E.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Simultaneous measurement of shape and deformation using digital light-in-flight recording by holography2000In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 39, no 1, p. 244-253Article in journal (Refereed)
  • 82.
    Nilsson, Bengt
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Interferometric 3-D Camera for Shape and Deformation Measurements using Ultra Short Laser Pulses2002Doctoral thesis, comprehensive summary (Other scientific)
    Download full text (pdf)
    FULLTEXT01
  • 83.
    Nilsson, Per
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Erixon, Gunnar
    Lange, Mark
    KTH, Superseded Departments (pre-2005), Production Engineering.
    An easy to use tool for productdesign: The CARP Software1997In: Schriftenreihe WDK, 1997, p. 301-308Conference paper (Refereed)
    Abstract [en]

    Today's CAE tools are focused on the later stages in the product development process and execute specific product tasks such as CAD, CAM and FEM. We have from our own experience and other research work [Yoshikawa 89] understood that there is a definite lack of CAE tools that can be used in the early stages of the product development process, which we here call preCAD. The objective of this research project is to develop a tool where the early phases of the product development process are modeled transparently and logically in a computer. The tool we are working on is called CARP; Computer Aided Rapid Product Development. It will support concurrent engineering by reducing product development lead time. CARP will also capture design history from the Specification phase (Elaboration of the Problem), through the Concept phase (Conceptual Design) and all the way to the Elaboration phase (Embodiment Design using Solid Modeling CAE). Quality and efficiency in the product development process will be improved by using this kind of tool.

  • 84.
    Nilsson, Per
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Löfgren, Bengt
    KTH, Superseded Departments (pre-2005), Machine Design.
    Erixon, Gunnar
    QFD in the Development of Engineering Studies1995In: Proceedings of the seventh symposium on Quality Function Deployment, 1995Conference paper (Refereed)
    Abstract [en]

    Shorter development time, the need to satisfy customer needs and demands, and increasing competition. These are common requirements of today's products and product development processes. The same kind of requirements might also be put on the engineering students passing through an educational system. This analogy has been used in the planning of engineering studies at this Swedish university programs. This paper reports the use of QFD in developing an education a system that provides high quality engineers well adapted to a productive life and capable of life-long learning.

  • 85.
    Olwal, Alex
    et al.
    KTH, Superseded Departments (pre-2005), Numerical Analysis and Computer Science, NADA.
    Lindfors, Christoffer
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Gustafsson, Jonny
    KTH, Superseded Departments (pre-2005), Production Engineering.
    An Autostereoscopic Optical See-through Display for Augmented Reality2004In: Proceeding SIGGRAPH '04 ACM SIGGRAPH 2004 Sketches, 2004, p. 108-Conference paper (Refereed)
  • 86.
    Onori, Mauro
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Assembly Net: precision assembly technologies for mini and micro products2001In: Assembly Automation, ISSN 0144-5154, E-ISSN 1758-4078, Vol. 21, no 2, p. 123-128Article in journal (Refereed)
    Abstract [en]

    Reports on the findings of an international Workshop on (Flexible) Assembly Automation held at Delft University of Technology, The Netherlands in May 2000. This workshop was organised to discuss immediate and future problems associated with precision assembly. This resulted in the creation of a new European initiative: Assembly Net. Discusses the emerging needs for precision assembly and considers associated technologies.

  • 87.
    Onori, Mauro
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Barata de Oliveira, Jose
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Martinez-Lastra, J.
    Tichem, Marcel
    European Precision Assembly: Roadmap 2010 - Final Report2004Report (Refereed)
  • 88.
    Onori, Mauro
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Barata, Jose
    Alsterman, Henrik
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Assembly Cell Control Strategy and Dynamic Re-Design Methodology2004Report (Other academic)
  • 89.
    Onori, Mauro
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Barata, Jose
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Camarinha-Matos, L.
    A New Shop Floor Approach for Agile Assembly Systems2004In: Proceedings of the International Precision Assembly Seminar IPAS’2004, Bad Hofgastein, Austria, 11-13.02. 2004, University of Nottingham , 2004Conference paper (Refereed)
  • 90.
    Onori, Mauro
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Croquet, V.
    Raucent, B.
    Fractionned Refilling or Injection Implantable Drug Delivery System2004In: Proceedings of the 2nd International Symposium on Nanomanufacturing, 2004Conference paper (Refereed)
  • 91.
    Onori, Mauro
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Kenger, Patrick
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Bergdahl, M.
    Decision Method for Product Verification Strategy in the Assembly System: A Theoretical Approach2004Report (Refereed)
  • 92.
    Onori, Mauro
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Lastra, J.M.
    Evolvable Assembly System Platforms: Definitions and Approaches2004Report (Refereed)
  • 93.
    Onori, Mauro
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Sandin, Erik
    Alsterman, Henric
    KTH, Superseded Departments (pre-2005), Production Engineering.
    European Assembly: Threats and Counter-Measures2002In: Intelligent Assembly and Disassembly2001 (IAD'2001) / [ed] Kopacek, P, Pereira, CE, Noe, D, Elsevier, 2002, p. 37-41Conference paper (Refereed)
    Abstract [en]

     Investments in automatic assembly systems applications have stalled, and outsourcing of final assembly operations, to low-wage nations, has been a strong trend. In the meantime, several South East Asian countries have increased their level of automation and product knowledge. The need to modernise European assembly industry is therefore urgent. The robot systems market in Europe is expected to rise if certain conditions are met. The successful implementation of adequate automatic assembly solutions will only boost this rise, but only if it will provide modular, easily configured solutions. This article will illustrate details of these trends and their effects on European assembly. The article will also clarify emerging needs within assembly, such as miniaturisation, disassembly, and process-oriented assembly solutions. Obviously, these new requirements further enhance the urgency of a coordinated effort from European academia and industry. The authors will also provide a short summary of the ongoing research projects at the Royal Institute of Technology and the newly started European Commission funded Assembly Net Consortium, which gathers over 20 universities and 15 companies in a thematic network. Finally, a brief overview of a newly started research project with Ericsson Radio Systems is also detailed.

    Download full text (pdf)
    fulltext
  • 94.
    Rashid, Amir
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Passive vibration damping in machining systems2003Licentiate thesis, monograph (Other scientific)
  • 95.
    Rosen, Jonas
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Johansson, M.
    Manufacturing Data Management based on an Open Information Model for Design of Manufacturing Systems and Processes2001In: CIRP Journal of Manufacturing Systems, Vol. 31, no 2Article in journal (Refereed)
  • 96.
    Rosén, Jonas
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Collaborative Engineering, a tool for the Extended Enterprise based on an Open Information Model2001In: Proceedings of the CIRP 2001 International Design Seminar, 2001Conference paper (Refereed)
  • 97.
    Rosén, Jonas
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Collaborative Engineering, a tool for the Extended Enterprise based on an Open Information Model2001In: Proceedings of the CIRP 2001 International Design Seminar, 2001Conference paper (Refereed)
  • 98.
    Rosén, Jonas
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Kjellberg, Torsten
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Johansson, Mattias
    KTH, Superseded Departments (pre-2005), Production Engineering.
    A System Framework for Integrated Design and Manufacturing based on Standards1999In: Proceedings of the CIRP 99 International Design Seminar, 1999Conference paper (Refereed)
  • 99.
    Sivard, Gunilla
    KTH, Superseded Departments (pre-2005), Production Engineering.
    A generic information platform for product families2001Doctoral thesis, monograph (Other scientific)
    Abstract [en]

    The research work detailed in this dissertation relates to the computer representation of information which concerns product families and product platforms. Common to competitive companies today, is the quest of designing products and processes to meet a large variety of customer needs, in short time, and based on few resources. One way to succeed with this endeavor is to plan for the variety and design a modular, or adaptive, product family based on a common platform of resources. To further increase the efficiency in delivering customized products in time, a computer processible model of the family is created, which is used to realize a customer specific product variant during the order phase.

    The objective of this research is to define a generally applicable model of product family information for the purpose of supporting various applications, and for achieving an efficient utilization of information.

    The approach is to define a model of the product family according to the theory of Axiomatic Design, which reflects the trace from various requirements to functions and different properties and components of the product. By representing information from design in a generally applicable format, this information can be reused when building the configuration models of the order phase. By adapting the model to an existing standard, information exchange between systems is supported, and access is provided to information concerning detailed physical parts as well as constructs addressing various use and version management.

    Contributions include a description of a model architecture with reusable functional solutions, interfaces, structures and interrelations between platform solutions and product family. Further, it is described how to extend and model the domains and interrelations of axiomatic design in an information model, which is adapted to the product modeling standard of ISO10303-214.

     

     

    Download full text (pdf)
    FULLTEXT01
  • 100. Ssemakula, H.
    et al.
    Ståhlberg, Ulf
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Grain size as influenced by process parameters in copper extrusion2001In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 30, no 4, p. 232-237Article in journal (Refereed)
    Abstract [en]

    Today, different methods and materials are investigated for the manufacturing of large canisters meant for encapsulation of nuclear waste. One method of interest includes hot extrusion of coarse-grained copper ingots. It has been shown that the grain size in the final product must be small in order to enable ultrasonic testing and to guarantee high resistance towards creep and corrosion. Different codes are being developed for predicting the final grain size as influenced by temperature, strain and strain rate. In the present work, these parameters have been determined by simulations for different material elements during extrusion of cylindrical copper billets. Elements, located at various distances from the central axis of the initial workpiece, were traced from the inlet to the outlet of the die by utilizing the FE-code FORM2D. In this way, the parameters describing the deformation history of the elements were determined as functions of time. Experiments corresponding to the simulations were carried out. Starting with billets in as-cast condition, the final grain sizes were evaluated. It is concluded that the initial grain size of an as-cast cylindrical billet is heavily decreased for all the extrusion conditions studied. The investigation was carried out for different working temperatures, 550, 650 and 750 degreesC and extrusion ratios, 10 and 15. The final grain size was found within the interval 23-37 mum. The smallest grain size was, for each working condition, located close to the surface of the extrudate where the largest strains and temperature increases occurred. Low extrusion temperatures gave the best results.

123 51 - 100 of 120
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf