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  • 201.
    Dahlberg, Tore
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Lundqvist, Andreas
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic forces in railway track due to unsupported sleeper2004In: Nordic Vibration Research 2004,2004, Stockholm: SVIB , 2004, p. 14:1-14:11Conference paper (Other academic)
  • 202.
    Dahlberg, Tore
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Lundqvist, Andreas
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic forces in railway track due to unsupported sleepers2004In: Twelfth Nordic Seminar in Railway Mechanics,2004, 2004Conference paper (Other academic)
  • 203.
    Dahlberg, Tore
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Lundqvist, Andreas
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic train/track interaction including model for track settlement evolvement2004Report (Other academic)
  • 204.
    Dahlgaard, Jens Jörn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    In Search of Excellence - Past, Present and Future2005In: QMOD Conference,2005, 2005Conference paper (Refereed)
  • 205.
    Dahlgaard, Jens Jörn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    In Search of Excellence: past, present and future.2006Book (Other academic)
    Abstract [en]

    Some of the leading models and frameworks about Excellence from the last 25 years are presented and discussed: Peters and Waterman’s eight excellence attributes (1982) , Peters and Austin’s simplified excellence model (1985), Lists of Best Practices, Xerox Excellence Models (1990, 2002), the European Excellence Model (1992) and two different but overlapping “4P Models” (1999, 2004). At the end of the paper past, present and future of TQM and Excellence is discussed.

  • 206.
    Dahlgaard, Jens Jörn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Management Control Theories and the European Excellence Model2005In: European Quality, ISSN 0969-059X, Vol. 11, no 3, p. 34-43Article in journal (Refereed)
  • 207.
    Dahlgaard, Jens Jörn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Dahlgaard Park, Su Mi
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    In Search of Excellence - Past, Present and Future2006In: Kreativ und Konsequent / [ed] Dahlgaard, Su Mi Park,Dahlgaard, Jens Jørn, Berglin: Carl Hanser Verlag , 2006, p. 57-84Chapter in book (Other academic)
    Abstract [de]

    "Qualität ist nicht alles, aber ohne Qualität ist alles nichts!", so Walter Masing. Wie kaum ein anderer hat Masing den Qualitätsbegriff geprägt und durch sein Wirken maßgeblich beeinflusst. Die DGQ gedenkt mit diesem Werk ihrem langjährigen Präsidenten und Ehren-Präsidenten. Unter der Herausgeberschaft von Herrn Professor Schnauber zeigen namhafte nationale und internationale Autoren aus Wissenschaft und Praxis, wie eng Kreativität und Innovation mit Qualitätsmanagement verknüpft sind - getreu des Leitmotivs von Walter Masing: nur mit einer gesicherten Basis lassen sich neue Gedanken generieren! Die Autoren widmen ihre Beiträge dieser großen Persönlichkeit des Qualitätsmanagements, dessen Einfluss weiterwähren wird.

  • 208.
    Dahlgaard, Jens Jörn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Dahlgaard Park, Su Mi
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    Measurement - Metrology of Improvement and Change2006In: Quality Tools and Methods for The 21st Century / [ed] Tito Conti, Yoshio Kondo, Gregory Watson, Salem, NH, USA: GOAL QPC , 2006, p. 75-106Chapter in book (Other academic)
    Abstract [en]

      Quality Tools and Methods for The 21st Century. Perspectives of the International Academy for Quality.  

    A collection of writings about quality as a management discipline, business management, and product management. Edited by Tito Conti, Yoshio Kondo, and Gregory H. Watson.  Also includes valuable quality ideas and concepts from Hans Dieter Seghezzi, Barrie G. Dale, Norman Burgress, Jens J. Dahlgaard, Su Mi Park Dahlgaard, Herbert Schnauber, Joachim Zulch, Asbjorn Aune, Sijo Shiba, David Walden, Yoji Akao, Thong Ngee Goh, and Shoichi Shimizu.

    The topics in this book are divided into three parts. The first part describes quality as a management discipline that must be practiced with the same degree of attention to detail as is required for finance systems, information systems, and people systems. The focus of the second part is on topics where integration of quality and business management practices will create a more stable overall management system. The third part of this book describes contributions of quality methods to the innovative design of products and services. It is in this area that organizations can continue their development by using new management practices, methods and concepts as enablers of change to help them achieve their desire for long-term competitive strength.    

    As quality transitions into the mainstream of management, the emphasis of quality professionals must focus on the areas of innovation and design to ensure the future quality of business. This challenge of innovation will define the next focus areas for management in the coming decades.

  • 209.
    Dahlgaard, Jens Jörn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Dahlgaard Park, Su Mi
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    Strategies, Values and Methods for Breakthrough and Sustainable Development2004In: Mega Week Conference of the e-TQM College,2004, 2004Conference paper (Refereed)
  • 210.
    Dahlgaard, Jens Jörn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Dahlgaard Park, Su Mi
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    The 4P Quality Strategy for Breakthrough and Sustainable Development2004In: European Quality, ISSN 0969-059X, Vol. 10, no 4Article in journal (Refereed)
  • 211.
    Dahlgaard, Jens Jörn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Dahlgaard Park, Su Mi
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    Kammerlind, Peter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    In Search of Excellence in Leadership -a Comparison between European Leaders and Leaders in Swedish Health Care2004In: International Conference of the Central and Eastern European Countries,2004, 2004Conference paper (Refereed)
  • 212.
    Dahlgaard, Jens Jörn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Dahlgaard Park, Su Mi
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    Kammerlind, Peter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    In Search of Excellence in Leadership -a Comparison between European Leaders and Leaders in Swedish Health Care2004In: International QMOD Conference,2004, 2004, p. 113-Conference paper (Refereed)
  • 213.
    Dahlgaard, Jens Jörn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Park- Dahlgaard, Su Mi
    Institute of Service Managment Lunds University.
    Martensen, Anne
    Department of Marketing Copenhagen Business School.
    Measuring and Diagnosing Innovation Exellence - Simple contra advanced approaches - A Danish Study2006In: QMOD Conference,2006, Liverpool, UK: QMOD , 2006Conference paper (Refereed)
    Abstract [en]

      

  • 214.
    Dahlgaard Park, Su Mi
    et al.
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    Dahlgaard, Jens Jörn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Management Control Theories and the European Excellence Model2004In: Association of Economists of Slovenias yearly conference on modern aspects in business and organizational analysis,2004, 2004Conference paper (Refereed)
  • 215.
    Dahlgaard Park, Su Mi
    et al.
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    Dahlgaard, Jens Jörn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    The Human Dimension -A Leadership Challenge of Past, Present and the Future2004In: 13 th National Quality Congress,2004, 2004Conference paper (Refereed)
  • 216.
    Dahlgaard Park, Su Mi
    et al.
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    Dahlgaard, Jens Jörn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    The Human Dimension: Critical to systainable quality2003In: Quality into the 21st century :: perspectives on quality and competitiveness for sustained performance / [ed] Tito Conti,,Gregory H. Watson,Yoshio Kondo, Milwaukee, Wisconsin: ASQ Quality Press , 2003, p. 72-103Chapter in book (Other academic)
    Abstract [en]

    Many companies that are achieving the most significant business results today, made a shift in focus from the management of quality in the twentieth century to the quality of management in the twenty-first century. The big difference is that these companies focus on quality as a fundamental organization and market-wide strategy for their company’s competitiveness.

    Quality into the 21st Century: Perspectives on Quality and Competitiveness for Sustained Performancefocuses on the call for a more expansive use of quality practices throughout business in the twenty-first century than in their original application in manufacturing. It also calls for a definitive emphasis on the use of quality principles throughout health care, education, technology, medicine and government. 

    The editors complied a collection of papers that focus on the emerging themes in quality including social values, privacy, security, and software quality.

  • 217.
    Dahlgaard Park, Su Mi
    et al.
    Linköping University, Faculty of Arts and Sciences. Linköping University, Department of Management and Economics, Industrial marketing.
    Dahlgaard, Jens Jörn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Toward a holistic understanding of human motivation: core values - the entrance to People's Commitment?2003In: International Journal of AI and Society, Vol. 17, no No.2, p. 150-180Article in journal (Refereed)
  • 218.
    Danestig, Maria
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Energy Systems.
    Westerberg, Karin
    Linköping University, Faculty of Arts and Sciences. Linköping University, The Tema Institute.
    Att förändra ett uppvärmningssystem: bilder av framtidens energisystem i Söderköping2005Report (Other academic)
    Abstract [sv]

    Rapporten bygger på en fallstudie i Söderköpings kommu och sätter bilder av framtidens uppvärmningssystem och dessa bilders betydelser för lokalt förändringsarbete i fokus. I fallstudien ingår intervjuer med 4 kommunpolitiker, 4 kommunal tjänstemän samt 2 representater för det privata fjärrvärmeföretaget. Dessutom studeras kommunal protokoll samt massmedierapporteringen kring uppvärmningen i Söderköping. Centrala frågor är: Hur tolkar lokala aktörer tidigare förändringar?; Hur påverkar dessa tolkningar aktörernas bilder av framtidens uppvärmningssystem?; Vilka förhoppningar och farhågor knyts till framtiden?; samt Hur kan lokala framtidsbilder omformas till scenarier och hur kandessa scenarier användas i det kommande energiarbetet i kommunen? Rapportens bärande kategorier är historier, framtidsbilder och scenarier. Med historier menas de berättelser om tidigare förändringar som återfinns i massmedia och kommunala protokoll, men också i informanternas intervjuer. Framtidsbilder utgörs av de förhoppningar och farhågor kring den framtida utvecklingen av uppvärmningssystemet som förmedlats via intervjuerna. Med scenarier menas slutligen de renodlingar och utvecklingar av centrala drag i framtidsbilderna som forskarna stått för och som utvecklats till diskussionsunderlag för kommande energiarbete i kommunen. De scenarier som presenteras och diskuteras är: Centraliserade biobränslesystem Värmepumpskommunen, samt Den decentraliserade självhushållningen

  • 219.
    Danestig, Maria
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Energy Systems.
    Westerberg, Karin
    Linköping University, Faculty of Arts and Sciences. Linköping University, The Tema Institute.
    Lokala aktörers visioner: Framtidens uppvärmningssystem i en kommun2005In: Energitinget,2005, 2005, p. 30-30Conference paper (Other academic)
    Abstract [sv]

    Den situation som olika aktörer Söderköping står inför då det gäller uppvärmningssystemet fokuseras i den studie som presenteras. Huvudsyftet med arbetet har varit att studera aktörernas uppfattning om hur uppvärmningssystemet kan utvecklas samt vilka lokala scenarier som kan skapas. Studien belyser frågor som vilka hinder och möjligheter som finns för uppvärmningssystemets utveckling givet lokala förutsättningar samt hur olika aktörers inflytande skiftar i olika utvecklingsmöjligheter. Presentationen bygger på rapporten "Att förändra ett uppvärmningssystem: bilder av framtidens uppvärmningssystem i Söderköping"

  • 220.
    Degerman, Pär
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Automatic parallel parking: park assist systems for passenger vehicles2007Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis discusses how the problem of parking a passenger car can be solved. There ane numerous obstacles when creating a fully or semi automated system for assisting the parking maneuver. The obstacles range from unobtrusive Man Machine Interface issues to robust algorithms for finding features in sensor data.

    Such a system will also have to cope with ever changing environments, most of which will not be discovered during the design phase. Misuse will also be common, since the function is aimed at a mass market - the car buyers. These interesting problem areas is also coupled with the customer value. A car buying customer today aims at feature content and comfort. So for a parking system to survive it needs to be extremely intuitive; the customer value must be discovered during a short test drive with the vehicle. A learning period before the user can operate the system is not feasible.

    The work presented here proposes an interesting algorithm for finding parking space features in sensor data collected using ultrasonics. The algorithm, which is based on the well known Hough transform have been proved to be robust in real world experiments.

    Furthermore it is also investigated how critical the mount ing of the environment sensing subsystem is. Where should the sensors be placed and where should they be facing to maximize the performance.

    Emphasis have also been put on designing a functional architecture that fits in the car development process of today. The implementation of a system in a car must fit in the platform and component reuse is critical to keep cost down.

    To test theories developed during the work a prototype car has been used. The prototype is essential to analyze the robustness of algorithms in different parking scenarios. It has also been an invaluable tool when conducting customer surveys to find where the customer value of these kind of systems is.

    List of papers
    1. A semi-automated parallel parking system for passenger cars
    Open this publication in new window or tab >>A semi-automated parallel parking system for passenger cars
    2006 (English)In: Proceedings of the Institution of mechanical engineers. Part D, journal of automobile engineering, ISSN 0954-4070, E-ISSN 2041-2991, Vol. 220, no 1, p. 53-65Article in journal (Refereed) Published
    Abstract [en]

    Car parking has been, and still is, a growing problem, with increasing vehicle sizes in the luxury segment as well as sport-utility vehicles. This is especially true when bearing in mind the confined parking spaces in parking lots and cities. While damage during parking generally does not cause any injury to the passengers, it is costly and annoying. Park assist systems are by no means new on the market, since passive systems which provide longitudinal guidance using ultrasonic distance sensors have been available on the market for a number of years.

    The system presented is a semi-automated approach to parallel parking problems, as they frequently occur in European and Asian cities. The challenge during the development of this system was to have as few components as possible added to a standard vehicle, seeking reuse of many of the already built-in functionalities. The result is a system that leaves the longitudinal control of the vehicle to the driver but automates the steering process, and even stops the vehicle when the final parking position is reached.

    Keywords
    electric steering gear, ultrasonic distance sensors, functional architecture
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-36019 (URN)10.1243/095440705X69650 (DOI)000234903900005 ()29425 (Local ID)29425 (Archive number)29425 (OAI)
    Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-20
    2. Hough Transform for Parking Space Estimation Using Long Range Ultrasonic Sensors
    Open this publication in new window or tab >>Hough Transform for Parking Space Estimation Using Long Range Ultrasonic Sensors
    2006 (English)In: SAE Technical Paper, Detroit: SAE , 2006, p. 2006-01-0810-Conference paper, Published paper (Refereed)
    Abstract [en]

    This paper describes a system for supporting the driver of a passenger car in different parking situations. Todays cars are getting larger in size and the drivers view in both forward and rearward direction is becoming more limited. This fact calls for a system of sensors and algorithms capable of supporting the driver through the parking maneuvre in a safe and smooth way.

    The paper presents the development of some of the subsystems in a fully automatic parallel parking system, utilizing ultrasonic ranging sensors for environment mapping. In contrast to existing passive parking aid systems, the ultrasonic range sensors need to have a narrower aperture to be able to map the surroundings properly. This can be accomplished by either increased sensor size or by a higher number of sensors.

    The emphasis of the paper is the signal conditioning in the parking system. The Hough-transform along with a statistical CUSUM test are used to find the properties of the target parking space.

    The system makes use of hardware components already available in modern cars and a small number of added components. The resulting system is automated, from finding a suitable parking space to maneuvering the car into the parking space, while keeping the driver in authority since the longitudinal control, i.e. throttle and brakes, are still the drivers responsibilities.

    The prototype system is implemented in a Volvo S60 which has been modified with an electric power steering unit and an ultrasonic sensor array consisting of a total of six sensors spread out around the vehicle. The electric power steering unit is used for steering wheel angle control when the system is active by adding an external torque to the assist torque normally applied.

    Place, publisher, year, edition, pages
    Detroit: SAE, 2006
    Keywords
    automatic parking systems, ultrasonic sensing
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-36020 (URN)10.4271/2006-01-0810 (DOI)29427 (Local ID)29427 (Archive number)29427 (OAI)
    Conference
    SAE 2006 World Congress & Exhibition. Detroit, USA. April 3-6, 2006
    Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-20
    3. A Full Four-Quadrant Hydraulic Steering Actuator Applied to a Fully Automatic Passenger Vehicle Parking System
    Open this publication in new window or tab >>A Full Four-Quadrant Hydraulic Steering Actuator Applied to a Fully Automatic Passenger Vehicle Parking System
    2006 (English)In: Proceedings of the 4th FPNI-PhD Symposium, Lafayettem, IN, USA: FPNI Fluid Power Net Publications , 2006, p. 387-396Conference paper, Published paper (Refereed)
    Abstract [en]

    This project describes how the Active Pinion hydraulic steering system can be used to replace a electric power steering actuator in the Parking Pilot automatic parking system.

    Customer demand for fully or semi automatic parking systems in passenger cars, are getting higher with increased cost of parking related body damage repair coupled with restricted rearward sight and the larger dimensions of modern cars. This, however, puts new demands on the steering actuator. An automatic parking system requires full control of the steering servo, which is not possible with current hydraulic actuators. Instead these systems have to rely on electric servos which allow for the needed controllability.

    All current electric steering servos have the drawback that it is impossible to use them on anything but small or medium sized cars. Since a parking system can be seen as a premium accessory, which is more likely to attract customers who buy larger cars, this is a major hindrance for the success of automatic parking systems.

    A solution to the problem is to construct a controllable variant of the hydraulic steering servo, the Active Pinion. In this concept a small electric pilot motor is added to the traditional hydraulic valve, which adds one additional degree of freedom to the servo, accomplishing full four-quadrant operations.

    The project discusses how the Active Pinion concept is introduced in the Parking Pilot parking system and how different demands on the parking system relates to the performance of the actuator. The parking system is installed in a prototype car and simulation of the Active Pinion concept is accomplished with HWIL simulation in a load simulator.

    Place, publisher, year, edition, pages
    Lafayettem, IN, USA: FPNI Fluid Power Net Publications, 2006
    Keywords
    hpas, epas, automotive, power steering, automatic parkin, active pinion, parking plot
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-35816 (URN)28628 (Local ID)1-4243-0499-7 (ISBN)28628 (Archive number)28628 (OAI)
    Conference
    4th FPNI-PhD Symposium. Sarasota, FL, USA, 2006.
    Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-12-12
    4. Ultrasonic Sensor Modeling for Automatic Parallel Parking Systems in Passenger Cars
    Open this publication in new window or tab >>Ultrasonic Sensor Modeling for Automatic Parallel Parking Systems in Passenger Cars
    2007 (English)In: SAE Technical Paper, 2007, p. 2007-01-1103-Conference paper, Published paper (Refereed)
    Abstract [en]

    The performance of a parking system is dependent on many factors. One is the placement of the sensors. In this paper a system which uses ultrasonic ranging sensors is considered. The mounting of a ultrasonic sensor on a passenger vehicle is restricted by, among other factors, design, assembly process, enclosure cost and reliability. All of which must be considered when choosing optimal mounting locations.

    The basis of this work includes a ray-trace based simulation environment which is used to capture the physical properties of sound traveling through air. The simulation environment together with sensor models, is used to evaluate the effect of different mounting positions on the accuracy of the detection of the parking space. The Hough transform is used here, as well as in the real system, in order to extract the confining lines of the parking space from the sensor measurements. The strength of these lines are then used to compare different sensor mounting locations.

    The created simulation environment differs from other work in this area since it tries to capture the physical properties of the sound waves as opposed to the geometric-only approach. The emitted sound pulse is divided into a large number of rays, each with sound properties tied to them. These rays are then traced through a model of the parking space environment, reflections are calculated and finally the summarized echo into the listening sensor is calculated.

    The simulation is implemented in 3D Studio MAX which make it relatively easy to create various realistic parking scenarios. An important factor for choosing 3D Studio MAX as the basis of the simulation environment was that it allowed for a new way of modeling ultrasonics using ray-tracing, and at the same time - using the same ray-tracing technology - excellent visualization capabilities.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-102488 (URN)10.4271/2007-01-1103 (DOI)
    Conference
    SAE 2007 World Congress & Exhibition, Detroit, MI, U.S.A., 16th–19th April, 2007
    Available from: 2013-12-12 Created: 2013-12-12 Last updated: 2017-12-20
  • 221.
    Degerman, Pär
    et al.
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Pohl, Jochen
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Sethson, Magnus
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Hough Transform for Parking Space Estimation Using Long Range Ultrasonic Sensors2006In: SAE Technical Paper, Detroit: SAE , 2006, p. 2006-01-0810-Conference paper (Refereed)
    Abstract [en]

    This paper describes a system for supporting the driver of a passenger car in different parking situations. Todays cars are getting larger in size and the drivers view in both forward and rearward direction is becoming more limited. This fact calls for a system of sensors and algorithms capable of supporting the driver through the parking maneuvre in a safe and smooth way.

    The paper presents the development of some of the subsystems in a fully automatic parallel parking system, utilizing ultrasonic ranging sensors for environment mapping. In contrast to existing passive parking aid systems, the ultrasonic range sensors need to have a narrower aperture to be able to map the surroundings properly. This can be accomplished by either increased sensor size or by a higher number of sensors.

    The emphasis of the paper is the signal conditioning in the parking system. The Hough-transform along with a statistical CUSUM test are used to find the properties of the target parking space.

    The system makes use of hardware components already available in modern cars and a small number of added components. The resulting system is automated, from finding a suitable parking space to maneuvering the car into the parking space, while keeping the driver in authority since the longitudinal control, i.e. throttle and brakes, are still the drivers responsibilities.

    The prototype system is implemented in a Volvo S60 which has been modified with an electric power steering unit and an ultrasonic sensor array consisting of a total of six sensors spread out around the vehicle. The electric power steering unit is used for steering wheel angle control when the system is active by adding an external torque to the assist torque normally applied.

  • 222.
    Degerman, Pär
    et al.
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Rösth, Marcus
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Palmberg, Jan-Ove
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    A Full Four-Quadrant Hydraulic Steering Actuator Applied to a Fully Automatic Passenger Vehicle Parking System2006In: Proceedings of the 4th FPNI-PhD Symposium, Lafayettem, IN, USA: FPNI Fluid Power Net Publications , 2006, p. 387-396Conference paper (Refereed)
    Abstract [en]

    This project describes how the Active Pinion hydraulic steering system can be used to replace a electric power steering actuator in the Parking Pilot automatic parking system.

    Customer demand for fully or semi automatic parking systems in passenger cars, are getting higher with increased cost of parking related body damage repair coupled with restricted rearward sight and the larger dimensions of modern cars. This, however, puts new demands on the steering actuator. An automatic parking system requires full control of the steering servo, which is not possible with current hydraulic actuators. Instead these systems have to rely on electric servos which allow for the needed controllability.

    All current electric steering servos have the drawback that it is impossible to use them on anything but small or medium sized cars. Since a parking system can be seen as a premium accessory, which is more likely to attract customers who buy larger cars, this is a major hindrance for the success of automatic parking systems.

    A solution to the problem is to construct a controllable variant of the hydraulic steering servo, the Active Pinion. In this concept a small electric pilot motor is added to the traditional hydraulic valve, which adds one additional degree of freedom to the servo, accomplishing full four-quadrant operations.

    The project discusses how the Active Pinion concept is introduced in the Parking Pilot parking system and how different demands on the parking system relates to the performance of the actuator. The parking system is installed in a prototype car and simulation of the Active Pinion concept is accomplished with HWIL simulation in a load simulator.

  • 223.
    Dekker, Sidney
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Accidents in transportation2004In: Encyclopedia of Applied Psychology / [ed] Charles Spielberger, San Diego, CA: Academic Press , 2004, 1, p. -2688Chapter in book (Other academic)
    Abstract [en]

    The Encyclopedia of Applied Psychology encompasses applications of psychological knowledge and procedures in all areas of psychology. This compendium is a major source of information for professional practitioners, researchers in psychology, and for anyone interested in applied psychology. The topics included are, but are not limited to, aging (geropsychology), assessment, clinical, cognitive, community, counseling, educational, environmental, family, industrial/organizational, health, school, sports, and transportation psychology. The entries drawn from the above-referenced areas provide a clear definition of topic, a brief review of theoretical basis relevant to the topic, and emphasize major areas of application.Also available online via ScienceDirect - featuring extensive browsing, searching, and internal cross-referencing between articles in the work, plus dynamic linking to journal articles and abstract databases, making navigation flexible and easy. For more information, pricing options and availability visit www.info.sciencedirect.com.

  • 224.
    Dekker, Sidney
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    On the other side of promise. What should we automate today?2004In: Human factors in the design of civil aircraft / [ed] John A. Wise, V. David Hopkin, Daniel J. Garland, Aldershot, UK: Ahsgate , 2004, 2, p. -704Chapter in book (Other academic)
    Abstract [en]

    A complete examination of issues and concepts relating to human factors in simulation, this book covers theory and application in space, ships, submarines, naval aviation, and commercial aviation. The authors examine issues of simulation and their effect on the validity and functionality of simulators as a training device. The chapters contain in depth discussions of these particular characteristics and issues. They also incorporate theories pertaining to the motivational aspects of training, simulation of social events, and PC based simulation.

  • 225.
    Dekker, Sidney
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Ten questions about human error: A new view of human factors and systems safety2004 (ed. 1)Book (Other academic)
    Abstract [en]

    Ten Questions About Human Error asks the type of questions frequently posed in incident and accident investigations, people's own practice, managerial and organizational settings, policymaking, classrooms, Crew Resource Management Training, and error research. It is one installment in a larger transformation that has begun to identify both deep-rooted constraints and new leverage points of views of human factors and system safety. The ten questions about human error are not just questions about human error as a phenomenon, but also about human factors and system safety as disciplines, and where they stand today. In asking these questions and sketching the answers to them, this book attempts to show where current thinking is limited--where vocabulary, models, ideas, and notions are constraining progress.

    This volume looks critically at the answers human factors would typically provide and compares/contrasts them with current research insights. Each chapter provides directions for new ideas and models that could perhaps better cope with the complexity of the problems facing human error today. As such, this book can be used as a supplement for a variety of human factors courses.

  • 226.
    Dekker, Sidney
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Understanding situated performance in human error investigations2008In: Handbook of forensic human factors / [ed] John A Wise, Daniel J Garland, V David Hopkin, London: Taylor & Francis , 2008, 2, p. -704Chapter in book (Other academic)
    Abstract [en]

    A complete examination of issues and concepts relating to human factors in simulation, this book covers theory and application in space, ships, submarines, naval aviation, and commercial aviation. The authors examine issues of simulation and their effect on the validity and functionality of simulators as a training device. The chapters contain in depth discussions of these particular characteristics and issues. They also incorporate theories pertaining to the motivational aspects of training, simulation of social events, and PC based simulation.

  • 227.
    Dekker, Sidney
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Why we need new accident models2004In: Human Factors and Aerospace Safety, ISSN 1468-9456, Vol. 2Article in journal (Refereed)
  • 228.
    Dekker, Sidney
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Hollnagel, Erik
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, CSELAB - Cognitive Systems Engineering Laboratory.
    Human factors and folk models2004In: Cognition, Technology & Work, ISSN 1435-5558, E-ISSN 1435-5566, Vol. 6, p. 79-86Article in journal (Refereed)
  • 229.
    Dekker, Sidney
    et al.
    IKP LIU.
    Lützhöft, Margareta
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Correspondence, cognition and sensemaking: A radical empiricist approach to situation awareness2004In: A cognitive approach to situation awareness: theory and application / [ed] Simon Banbury, Sébastien Tremblay, Aldershot: Ashgate Publishing Co , 2004, p. 22-41Chapter in book (Other academic)
    Abstract [en]

    The importance of 'situation awareness' (SA) in assessing and predicting operator competence in complex environments has become increasingly apparent in recent years. It has been widely established that SA is a contributing factor to many commercial and military accidents and incidents. Yet determining exactly what constitutes SA is a very difficult task, given the complexity of the construct itself, and the many different processes involved with its acquisition and maintenance. This volume brings together recent developments from researchers and practitioners from around the world who are studying and applying SA from a cognitive perspective. The 41 contributors represent many different theoretical perspectives, research approaches, and domains of application. Each chapter has a primary emphasis around one of three main topics - theory, measurement, and application - and examines the considerable inter-linkage between them. To bring further coherence to the book, all of the contributors received draft manuscripts of those chapters most relevant to their own. Designed to be completely international and interdisciplinary, the authors themselves present varied perspectives from academic departments and industrial organisations from around the world, and from a broad range of applications - with contributions from researchers in the domains of process control, sport, aviation, transportation, and command and control. The readership includes practitioners, academics and researchers within human factors, ergonomics and industrial psychology; and graduate and undergraduate students specialising within these areas during their final year.

  • 230.
    Dekker, Sidney
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Ohlsson, Kjell
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Hollnagel, Erik
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, CSELAB - Cognitive Systems Engineering Laboratory.
    Alm, Håkan
    Arbetsvetenskap Luleå tekniska universitet.
    Humans in a complex environment II: Automation, IT and operator work2003Book (Other academic)
  • 231.
    Derelöv, Micael
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    On conceptual design reliability: an approach for identification of potential failures2004Licentiate thesis, monograph (Other academic)
    Abstract [en]

    This thesis is the result of research in the area of Evaluation and Decision-Making in the Design Process. It examines how to support and facilitate the evaluation activities in the design process in order to create a more solid foundation on which to base design decisions. The focus, however, is not on decision-making in general, but primarily on how the technical feasibility and reliability of a conceptual solution may be estimated with a higher degree of certainty.

    The current tools and methods for determine the feasibility and reliability are mostly passive, i.e. they prescribe how to proceed and do not actively contribute to the result. There is need for tools and methods that take a more active part in the process, and that may convey experience about feasibility and reliability from former designs.

    The objectives with this research are to acquire knowledge about how and in what ways failures occur in a product and how they may be modelled in order to increase the understanding of them; and to develop a methodology that utilises the knowledge about the failure phenomena in order to identify and avoid problems in the solutions.

    The research approach is mainly explorative and is based on several case studies and observations. In the case studies, the failure phenomena are examined both qualitatively and quantitatively from different perspectives. In the observations, insight and experience in the usability and shortcomings of prevalent evaluation and reliability methods are gathered.

    The results may be divided into two parts, one descriptive and one prescriptive part. The descriptive result consists of a phenomena model capable of explaining the appearance of failures in a system. The phenomena model is based on the results and the conclusions from the case studies and the observations, and has given rise to an enhanced system model. The main conclusion from the descriptive part is that the detection of potential failures in a system is largely a question of identifying the potentials for different physical phenomenon to occur in the system, and to determine which effects the physical phenomenon will give rise to.

    The prescriptive results consist mainly of an information model for failure identification, from which a failure identification process has been extracted. The fundamentals of the process are to describe the behaviour in the system by searching for effects from physical phenomena, and to determine how these effects affect the functionality. The process is to some extent verified by a comprehensive example.

  • 232.
    Detterfelt, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Assembly technology.
    Johansson, Gert
    Combitech Systems AB.
    A UML Based Modeling Approach for Multi Domain System Products2006In: 1st Nordic Conference on Product Lifecycle Management - NordPLM 06,2006, 2006Conference paper (Other academic)
  • 233. Detterfelt, Jonas
    et al.
    Lovén, Eva
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Lakemond, Nicolette
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Project management, Innovations and Entrepreneurship .
    Contradicting views on creativity obstacles in efficient new product development2008In: The Proceedings of the XIX ISPIM Conference: Open Innovation: Creating Products and Services through Collaboration, Frankrike: ISPIM , 2008Conference paper (Refereed)
    Abstract [en]

    In this paper we aim to identify major obstacles for creativity in organizations characterized by a high focus on product development efficiency. The way these obstacles are perceived by the different individuals involved in product development is investigated. Different perceptions are compared and the contradictory views on creativity obstacles in product development are discussed. From our study, nine creativity obstacles relevant for organizations with a strong focus on efficiency emerge. These barriers were mainly related to the professional environment, e.g. “short-term efficiency focus” can be related to time constraints, while “unclear innovation strategy” concerns a lack of goals. Also barriers related to the environment emerged, i.e. “no forum for capturing ideas” exists. Self-imposed barriers, like the lack of interest for innovation, did not emerge in this study. Our case company seems to have problems in finding structures for balancing the demands on product development efficiency and creativity.

  • 234.
    Diószegi, Attila
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    On microstructure formation and mechanical properties in grey cast iron2004Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    A major user of cast components is the automotive industry, where the functionality of the components is related to environmental demands. Internal combustion engines are constantly being improved to emit less pollution. A vital part in this development is to increase the material properties of engine components during their life cycle. In particular, cylinder heads, cylinder blocks and piston rings for diesel engine are produced in grey cast iron. Cast iron is expected to be in use far into the foreseeable future, due to favourable properties and low production costs. This work has been devoted to study microstructure formation, the tensile properties of cast iron and to some extent defect formation.

    The microstructure develops during solidification and solid state transformations. An inverse thermal analysis method was developed to study the kinetics of the microstructure formation. The inverse thermal analysis used, the Fourier method, analyses the cooling curves of two thermocouples to study the solidification or transformation. To decrease experimental errors, simulations have been done and the cooling curves were analysed. The best results were obtained when the thermocouples were placed close to each other.

    With the help of the thermal analysis a time dependent and fading nucleation law of the eutectic cells was found to fit the experimental results best. The experiments were made by multiple thermal analyses, and six different types of inoculants were investigated. The eutectic growth behaviour during solidification was evaluated with inverse thermal analysis, and it was found that commercial inoculants not only affect the eutectic nucleation but they also control the eutectic growth rate.

    Models of densities and volume changes are an integral part of a microstructure simulation of cast irons. These models are important for the inverse thermal analysis and an understanding of the porosity and expansion penetration in cast iron.

    The tensile strength of grey cast iron has been discussed by examining the fracture mechanism of the material at failure. The ultimate tensile strength is a result of the intimate collaboration between the graphite flake and the primary phases. Several parameters, including the graphite morphology, carbon content, inoculation and cooling conditions influence the ultimate tensile strength by offseting the equilibrium between the major constituents, the graphite flakes embedded in the primary metallic matrix. A model to predict the ultimate tensile strength is developed based on the interpretation of the stress intensity behaviour in a eutectic cell.

    The models developed for nucleation, eutectic growth and prediction of tensile strength were introduced into a casting simulation program. Mould filling, solidificauon, microstructure development and tensile strength of a complex. shaped cylinder head were simulated.

    List of papers
    1. Measurement and simulation of thermal condition and mechanical properties in a complicated shaped cylinder head cast in gray iron
    Open this publication in new window or tab >>Measurement and simulation of thermal condition and mechanical properties in a complicated shaped cylinder head cast in gray iron
    2000 (English)In: Proceedings of the Ninth International Conference on Modeling of Casting, Welding and Advanced Solidification Processes / [ed] Peter R. Sahm, Shaker , 2000, p. 869-876Conference paper, Published paper (Refereed)
    Abstract [en]

    Development and design of heavy truck engine parts require improved knowledge on solidification kinetics and development of material properties. A suitable tool to handle the complex shape and solidification kinetics is the computer simulation of the casting process.

    The quality of calculated results is dependent on the thermo-physical properties used, boundary condition and the quality of kinetic models implemented for calculation of resulting metallographical structure and material properties. A good quality means a good correlation between simulated and measured properties.

    The paper will present a casting simulation of a cylinder head in complex shape for a diesel engine cast in grey iron together with results from measured cooling curves and investigated material properties. The values of heat transfer coefficient were calculated for a simple shaped sample, cast in a shell sand mould and used then for simulation of the cylinder head. The calculated and measured cooling curves correlate well, as well as the calculated and measured hardness value do.

    Place, publisher, year, edition, pages
    Shaker, 2000
    Keywords
    Cylinder head, cooling curve, casting simulation, heat transfer coefficient
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87050 (URN)3826572300 (ISBN)9783826572302 (ISBN)
    Conference
    The 9th International Conference on Modeling of Casting, Welding and Advanced Solidification Processes held in Aachen, Germany, on August 20 to 25, 2000
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2013-01-09
    2. Microstructure evaluation and simulation of mechanical properties of a cylinder head in cast iron
    Open this publication in new window or tab >>Microstructure evaluation and simulation of mechanical properties of a cylinder head in cast iron
    2001 (English)In: Proceedings of the First International Conference on the Science of Casting and Solidification / [ed] Doru M. Stefanescu, 2001, p. 269-277Conference paper, Published paper (Refereed)
    Abstract [en]

    Development. design and manufacturing of heavy truck engine parts require improved knowledge on solidification kinetics and development of material properties. A suitable tool to handle the complex shape and solidification kinetics is the computer simulation of the casting process. The result is dependent on the thermophysical properties used, boundcny condition and the quality of kinetic models implemented for calculation of resulting metallographical structure and material properties.

    The paper will present an analysis of the microstructure obtained in the cylinder head casting. The thermal analysis and cooling curves have been obtained through thermocouple measurements in the cylinder head. The microstructure analysis concerns both solidification and solid-state transformation The microstructure is related to the obtained mechanical properties as hardness. The filling, solidification and mechanical properties of the cylinder head have been simulared and compared with the results obtained from measurements. The calculated and measured cooling curves are compared as well.

    Keywords
    Grey iron, austenite, eutectic cell, pearlite lamellar spacing, cylinder head
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87052 (URN)9739428673 (ISBN)9789739428675 (ISBN)
    Conference
    First International Conference on the Science of Casting and Solidification: 28-31 May, 2001, Brasov, Romania
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2013-01-09
    3. Inverse thermal analysis method to study solidification in cast iron
    Open this publication in new window or tab >>Inverse thermal analysis method to study solidification in cast iron
    2004 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 17, no 5, p. 311-318Article in journal (Refereed) Published
    Abstract [en]

    Solidification modelling of cast metals is widely used to predict final properties in cast components. Accurate models necessitate good knowledge of the solidification behaviour. The present study includes a re-examination of the Fourier thermal analysis method. This involves an inverse numerical solution of a one-dimensional heat transfer problem connected to solidification of cast alloys. In the analysis, the relation between the thermal state and the fraction solid of the metal is evaluated by a numerical method. This method contains an iteration algorithm controlled by an under relaxation term to achieve a stable convergence. The heat transfer problem is reduced to one-dimension to promote the practical application of the method. Thermo-physical properties such as the volumetric heat capacity tabulated in the calculation are introduced as a function of solidifying phases. Experimental equipment was developed in order to investigate the thermal behaviour of the solidifying metal. Three cylindrically shaped cast samples surrounded by different cooling materials were introduced in the same mould allowing a common metallurgical background for samples solidifying at different cooling rates. The proposed inverse thermal analysis was tested on both experimental and simulated data.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87053 (URN)10.1179/136404604225020687 (DOI)
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2017-12-06
    4. On modelling of volume related defect formation in cast irons
    Open this publication in new window or tab >>On modelling of volume related defect formation in cast irons
    2000 (English)In: Proceedings of the Ninth International Conference on Modeling of Casting, Welding and Advanced Solidification Processes / [ed] Peter R. Sahm, 2000, p. 102-109Conference paper, Published paper (Refereed)
    Abstract [en]

    Formation of defects, e.g. porosity's and expansion penetration in cast irons, are highly related to volume changes during solidification. Prediction of porosity and expansion penetration requires a detailed modelling of structure formation and of the related volume change during solidification.

    The phase transformations in cast iron are highly dependent on the kinetics and therefore also strongly influenced by the cooling rate, nucleation and chemical composition. The transformation of liquid to solid, involves formation of phases with a variety of densities. The resulting volume changes often leads to formation of porosity or excess of material. The excess of material helps to give a sound casting but if the geometry is not favourable the metal penetrates into the sand mould. The balance between shrinkage and expansion is important to understand, since it is a fundamental problem to make iron castings without shrinkage or penetration defects. The volume changes of the phases can not be measured by direct methods, but with a combination of modelling and experiments an improved understanding can be obtained.

    The volumes of iron and carbon in liquid and austenite have been modelled by using a sublattice molar volume model. The models of volumes and solidification are implemented in a computer program to simulate the kinetics of phase formation and resulting volume changes of the system. Thermal analysis curves are coupled to the phase and volume changes.

    The paper discusses the modelling of solidification using kinetic models and the volume change during the cooling and precipitation of the solid phases. Influence of the compositions, solidification mode and nucleation on the volume change will be calculated.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87054 (URN)3826572300 (ISBN)9783826572302 (ISBN)
    Conference
    The 9th International Conference on Modeling of Casting, Welding and Advanced Solidification Processes held in Aachen, Germany, on August 20 to 25, 2000
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2013-01-09
    5. Inverse kinetic analysis method to study eutectic growth
    Open this publication in new window or tab >>Inverse kinetic analysis method to study eutectic growth
    2005 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 18, no 1, p. 41-46Article in journal (Refereed) Published
    Abstract [en]

    Deterministic modelling is a classical method used for solidification simulation. A common procedure uses a kinetic model to describe the growth of solid phases. Formulation of the kinetic models used to be done by direct observation of the solidification process involving thermal analysis and microstructure investigation. Much effort has been invested in studying eutectic alloys and their solidification kinetics. Different growth parameters were observed which are assumed to depend on experimental conditions. The present study uses a direct simulation including a kinetic model for simulation of the eutectic phase. The simulated microstructure and cooling curves were used to carry out inverse thermal and inverse kinetic analyses. The inverse kinetic analysis method introduced indicates a strong equivalence between the direct solidification model and the inverse calculation. The position of the cooling curves used in the inverse analysis has been investigated and the best results are obtained when the cooling curves analysed are from locations closely positioned in space.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87055 (URN)10.1179/136404605225022829 (DOI)
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2017-12-06
    6. A comparison of Fourier vs. Newtonian thermal analyse and its influence on the inverse kinetic growth calculation
    Open this publication in new window or tab >>A comparison of Fourier vs. Newtonian thermal analyse and its influence on the inverse kinetic growth calculation
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    Thermal analysis of cooling curves is a metallurgical process control tool. Any phase transformations and their kinetics are reflected in the cooling rate. An interpretation of the cooling rate and temperatures is coupled to critical parameters, which are needed to assure correct quality of the melt and to give recommendations to modify the melt. This paper was inspired by the question, how well does a thermal ana lysis with one or two thermocouples and subsequent numerical analysis reflect the real phase transformations which occur?

    Inverse kinetic analysis using Fourier Thermal Analysis and Newtonian Thermal Analysis has been investigated using simulated cooling curves. The present study uses a direct simulation including a kinetic model for simulation of a eutectic phase. In this case, since the solidification sequence is well defined the inverse kinetic analysis should recreate the relation between the growth rate and supercooling of the eutectic phase. The Newtonian Thermal Analysis is based on an interpretation of a single thermal point with respect to solidification and contains a series of assumptions which are not entirely undoubted physically.

    Consequently the inverse kinetic analysis results in random quality growth parameters. The Fourier Thermal Analysis is based on interpretation of temperature differences between two thermal points with respect to solidification. The calculations conducted, in combination with the inverse kinetic analysis reveal a stable procedure. The decisive parameter determining the quality of inverse analysis is the distance between the thermal points analysed. Closely situated thermal points assure the best quality. The Fourier Thermal Analysis reflects the solidification most correctly.

    Keywords
    Inverse model, thermal analyze, fraction solid, kinetic model
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87057 (URN)
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2013-01-09
    7. Evaluation of eutectic growth in grey cast iron by means of inverse modelling
    Open this publication in new window or tab >>Evaluation of eutectic growth in grey cast iron by means of inverse modelling
    2003 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 16, no 1-3, p. 301-306Article in journal (Refereed) Published
    Abstract [en]

    Computer simulation of casting becomes a valuable tool for developing advanced materials and casting components. Recent investigations and validation work on simulated cast components reveal the necessity of reliable analyses methods to determine solidification behaviour and to extract parameters for kinetic models to use at simulation of complex cast iron materials. The paper will present an inverse modelling method for determination of eutectic growth. The method include an experimental part proper to investigate simultaneously the solidification at three different cooling rates while the cast material has the same metallurgical origin, and a computational part for calculation of grow kinetics. Validation of the inverse method is made together with simulation. The inverse modelling of eutectic growth in grey iron indicates that chemical composition, type and amount of inoculants and cooling condition are strongly influencing the eutectic growth condition and gives different eutectic growth coefficients. By invoking a generalized KJMA* equation, the shape of the growing eutectic interface can be predicted. Deviation from perfectly spherical growth in real solidification cases is the source of variation of eutectic growth coefficients. The results of the inverse model are valuable to simulate differences in solidification behaviour in differently treated grey iron melts. * KJMA is the abbreviation of the name of the famous scientists Kolmogorow, Johnson, Mehl and Avrami who developed and applied the equation.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87059 (URN)
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2017-12-06
    8. A study of eutectic inoculation in grey iron by addition of Fe-Si-Ca-Al-, Sr, Ba, Zr, Ti, RE and C
    Open this publication in new window or tab >>A study of eutectic inoculation in grey iron by addition of Fe-Si-Ca-Al-, Sr, Ba, Zr, Ti, RE and C
    2003 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 16, no 1-3, p. 29-34Article in journal (Refereed) Published
    Abstract [en]

    The interest to improve the mechanical properties and decrease shrinkage or expansion defects in grey cast irons, the inoculation is an important issue for component manufactures. The inoculation, growth of graphite and eutectic structure, are related to those demands. The paper will show a study of the effect of some inoculants on the graphite nucleation and eutectic microstructure in grey cast iron. The procedure to achieve this was to study the influence of inoculants and cooling rate on the eutectic microstructure. Six inoculants were chosen with a base of Fe-Si-Ca-Al with additions of Sr, Ba, Zr, Ti, RE and C at different proportions. Two of the inoculants were investigated at three different levels of additions. The inoculants gave eutectics with great variety of microstructure. The experimental equipment was designed to produce cast samples under controlled thermal conditions and equipped with thermocouples. To study the influence of cooling rate on the eutectic nucleation, the mould was equipped with three different cooling conditions. In order to measure the eutectic cell size the samples were colour etched. The measurements were made near the thermocouples to relate the eutectic cell size and cells/area with the cooling curves. The microstructure, cell-size and cooling curves were used to model the nucleation behaviour of the investigated compositions and solidification behaviour. The investigation showed that the type and amount of inoculation influenced the number of potent nuclei of graphite eutectic and the fading followed Lifshitz-Slyosov-Wagner (LSW) theory of ripening.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87060 (URN)
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2017-12-06
    9. Microstructure and tensile properties of grey cast iron
    Open this publication in new window or tab >>Microstructure and tensile properties of grey cast iron
    2004 (English)Report (Other academic)
    Abstract [en]

    Gray cast iron is a widely used construction material with a unique combination of properties such as very good thermal conductivity, vibration damping ability, and good machinability. The production method of casting is convenient to achieve a near final shape of complex geometries. A significant use of this beneficial construction materials can be found in diesel engine components, including cylinder heads, cylinder blocks and piston rings. Environmental and economic factors necessitate the development and optimization of engine components. The present paper summarizes a study of major process and material parameters to maximize and optimize the mechanical properties under static load of grey cast iron.

    The tensile strength of grey cast iron has been discussed by revealing the fracture mechanism of the material at failure. The ultimate tensile strength is clearly the result of the intimate collaboration between the graphite flake and the primary phases. Several parameters, including the graphi te morphology, carbon content, inoculation, and cooling conditions during solidification influence the ultimate tensile strength by affecting the equilibrium between the major constituents and cracks in the metallic matrix. A model to predict the ultimate tensile strength is developed based on the interpretation of the stress intensity behaviour in a eutectic cell.

    Place, publisher, year, edition, pages
    Jönköping: Ingenjörshögskolan, 2004. p. 35
    Series
    Research Report. School of Engineering., ISSN 1404-0018 ; 1
    Keywords
    Grey iron, Eutectic cell, Graphite morphology, Carbon content, Inoculation, Cooling rate, Mechanical properties, Tensile strength, Maximum stress intensity factor, Primary austenite
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87061 (URN)
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2013-01-09
    10. Microstructure and tensile property simulation of grey cast iron components
    Open this publication in new window or tab >>Microstructure and tensile property simulation of grey cast iron components
    2004 (English)Report (Other academic)
    Abstract [en]

    Designers and manufacturers of grey cast iron components have for a long time been interested in predicting microstructures and tensile properties. Accurate predictions are desirable to develop and optimize cast components as well as to reduce manufacturing expenses.

    Recent developments in the field of eutectic nucleation, eutectic growth and prediction of tensile strength in grey cast iron have been implemented into commercial, finite difference method based, simulation software. Cylindrical samples with varied cooling conditions and a complex shaped cylinder head have been simulated. The simulation procedure includes kinetic models for microstructure prediction. A new fading law is introduced to calculate the nucleated eutectic and inoculants adapted eutectic growth. The tensile strength is calculated using a model based on the stress intensity in the metallic matrix caused by the presence of graphite flakes.

    Cooling curves, microstructure and tensile properties obtained by simulation are compared to measured values.

    Place, publisher, year, edition, pages
    Jönköping: Ingenjörshögskolan, 2004. p. 16
    Series
    Research Report. School of Engineering., ISSN 1404-0018 ; 2
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87062 (URN)
    Available from: 2013-01-09 Created: 2013-01-09 Last updated: 2013-01-09
  • 235.
    Dugic, Izudin
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology. Department of Component Technology - Castings, School of Engineering, Jönköping University.
    Metal Expansion Penetration During Solidification of Grey Cast Iron1999Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The meta! expansion penetration has been examined experimentally. The whole casting process was simulated using a commercial software, in order to investigate the solidification characteristics and the pore formation in the casting studied. In order to do this, a special module for cast iron was used, where nucleation and growth of all relevant phases are considered. During simulation it is possible to detect the areas where porosities are likely to be formed. The results of the experiments show that expansion penetration generally occurs in the same areas as detected in the simulation depending on the solidification path. The inoculation and solidification behaviour will result in an excess or deficiency of meta! at the end of solidification. This will lead to either meta! penetration or the formation of pores.

    A series of test castings were produced at a foundry. They were used to study the influence of chemical composition, the type and amount of inoculant and the casting temperature. The results show that the carbon and phosphorus content had an influence on meta! penetration. The tendency for meta! penetration decreased whit decreasing carbon content as well as with increasing phosphorus content.

    The experiments show that the type and amount of inoculant and casting temperature for grey cast iron influence the meta! expansion penetration in areas with late solidification and where the melt is in contact with the sand mould. The worst cases of meta! penetration were obtained with uninoculated melt. A !arge number of small eutectic cells making up a !arge fraction of the volume were observed, resulting in a !arge penetration.

  • 236.
    Eckerhall, Daniel
    Linköping University, Department of Mechanical Engineering.
    The Possibility and Effects of Including the Transport Sector in the EU Emission Trading Scheme2005Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesis
    Abstract [en]

    The European Union has initiated a scheme for trading with CO2 emission allowances as a measure to reduce greenhouse gas emission levels. Since January 2005 companies from certain energy demanding sectors, responsible for approximately 50 % of the total CO2 emissions in the EU, are participating in this scheme, the so called EU Emission Trading Scheme.

    A trading scheme covering all sectors, i.e. all emissions in the EU would lead to the most cost efficient solution to reduce emissions by a certain amount. This means that the EU Emission Trading Scheme should be enlarged to cover also the transport sector, which is not participating today, but responsible for about 21 % of the total greenhouse gas emissions in the EU.

    There are three ways to include the transport sector in the EU Emission Trading Scheme, i.e. to administrate the handling and trading of emission allowances in the transport sector. The first is a so called downstream approach, meaning that the actual emitter of the GHG, in this case a private person driving a car or a haulage contractor using trucks to transport goods, would be responsible for acquiring and trading emission allowances in accordance to the amount of greenhouse gases that he emits. The second way is a so called upstream approach, meaning that the owner of fuel depots would be responsible for acquiring and trading emission allowances corresponding to the amount of fossil fuel that he is selling, which is proportional to the amount of greenhouse gases that is emitted when using the fuel. The third solution is to lay the responsibility for acquiring and trading emission allowances on the companies that are ordering the transportation service, indirectly causing greenhouse gas emissions when their goods are being transported.

    All three solutions have their advantages and disadvantages, but the benefits of using the upstream approach are the greatest. By allocating the responsibility for keeping and trading emission allowances at the fuel depots, an extensive part of greenhouse gas emissions from fossil fuel use, not only in the transport sector, could be covered by the EU Emission Trading Scheme to the lowest administrational cost possible.

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  • 237.
    Edin, Magnus
    Linköping University, Department of Mechanical Engineering.
    The Need for Adapted Change Methodologies in Wood Manufacturing Companies1999In: 15 International Conference on Production Research,1999, 1999Conference paper (Other academic)
  • 238.
    Edlund, Ulf
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    Volgers, Pieter
    A composite ply failure model based on continuum damage mechanics2004In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 65, no 3-4, p. 347-355Article in journal (Refereed)
    Abstract [en]

    A material model including the failure behaviour is derived for a thin unidirectional (UD) composite ply. The model is derived within a thermodynamic framework and the failure behaviour is modelled using continuum damage mechanics. The following features describe the model: (i) The ply is assumed to be in a plane state of stress. (ii) Three damage variables associated with the stress in the fibre-, transverse and shear directions, respectively, are used. (iii) The plastic behaviour of the matrix material is modelled. (iv) The difference in the material response in tensile and compressive loading is modelled. (v) Rate dependent behavior of plasticity and damage (i.e. strength) is modelled.

  • 239.
    Edvardsson, Jon
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Contributions to program- and specification-based test data generation2002Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Software testing is complex and time consuming. One way to reduce testing effort is to automatically generate test data. In the first part of this thesis we consider a framework by Gupta et al. for generating tests from programs. In short, their approach consists of a branch predicate collector, which derives a system of linear inequalities representing an approximation of the branch predicates for a given path in the program. This system is solved using their constraint solver called the Unified Numerical Approach (UNA). In this thesis we show that in contrast to traditional optimization methods the UNA is not bounded by the size of the solved system. Instead it depends on how input is composed. That is, even for very simple systems consisting of one variable we can easily get more than a thousand iterations. We will also give a formal proof that UNA does not always find a mixed integer solution when there is one. Finally, we suggest using some traditional optimization method instead, like the simplex method in combination with branch-and-bound and/or a cutting-plane algorithm as a constraint solver.

    In the second part we study a specification-based approach for generation of software tests developed by Meudec. Briefly, tests are generated by an automatic partitioning strategy based on partition rules. An important step in the process is to reduce the number of generated subdomains and find a minimal partition. However, we have found that Meudec-s algorithm does not always produce a minimal partition. In this work we present an alternative solution to the minimal partition problem by formulating it as an integer programming problem. By doing so, we can use well known optimization methods to solve this problem.

    A more efficient way to derive a minimal partition would be using Meudec's conjectured two-step reduction approach: vertex merging and minimal path coverage. Failing to find a general solution to either of the steps, Meudec abandoned this approach. How-ever, in this work we present an algorithm based on partial expansion of the partition graph for solving the first step. Furthermore, our work in partial expansion has led to new results: we have determined an upper bound on the size of a minimal partition. In turn, this has led to a stronger definition of our current minimal partition algorithm. In some special cases we can also determine lower bounds. 

  • 240.
    Egermark, Therese
    Linköping University, Department of Mechanical Engineering.
    Kranspetsstyrning: en jämförande utvärdering av kranstyrning för skogsmaskiner utförd i simulator2005Independent thesis Basic level (professional degree)Student thesis
    Abstract [sv]

    Syftet med studien var att utvärdera om kranspetsstyrning i skogsmaskiner är ett enklare styrsystem att lära sig från grunden och om arbetsbelastningen värderades lägre, än den konventionella styrningen. Meningen var även att kartlägga skillnader i inlärningsprocessen samt i upplevd arbetsbelastning. Detta krävde konstruktion av mätmetoder för insamling av relevant information.

    Utvärderingen gjordes i enskogsmaskinsimulator vid manövrering av skotare samt genom enkätundersökningar. Studien genomfördes med hjälp av försöksdeltagare från naturbruksgymnasiet Jällaskolan i Uppsala. Övningar och tester utfördes i skogsmaskinsimulatorn. Prestationer dokumenterades med hjälp av färdighetstester och enkäter.

    Resultaten av studien visar tydligt att kranspetsgruppen presterar signifikant bättre i samtliga kategorier som mätts genom tester, med undantag av åtgången tid per test. Avseende tid är kranspetgruppen inte statistiskt säkert bättre, men gruppens förbättringstakt är avsevärt högre än den konventionella gruppen, vars resultat hålls på samma nivå över perioden. Därmed visar studien att kranspetsstyrning i de gjorda testerna är ett enklare system att lära sig från grunden. Kvalitativa undersökningar visade att kranspetsgruppen i genomsnitt värderade arbetsbelastningen av testkörningarna lägre än den konventionella gruppen.

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  • 241.
    Eidenvall, Lars
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
    Ask, Per
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
    Loyd, Dan
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Applied Thermodynamics and Fluid Mechanics.
    Wranne, Bengt
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Clinical Physiology. Östergötlands Läns Landsting, Heart Centre, Department of Clinical Physiology.
    Determination of regurgitant flow and volume by integrating actual proximal velocities over hemispheres (IPROV) in two orthogonal planes1996In: Journal of the American Society of Echocardiography, ISSN 0894-7317, E-ISSN 1097-6795, Vol. 9, no 4, p. 527-538Article in journal (Refereed)
  • 242.
    Eidenvall, Lars
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
    Ask, Per
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
    Loyd, Dan
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Applied Thermodynamics and Fluid Mechanics.
    Wranne, Bengt
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Clinical Physiology. Östergötlands Läns Landsting, Heart Centre, Department of Clinical Physiology.
    Determination of regurgitant flow in a pulsatile model by integrating velocities from the entire 3D proximal velocity field1992In: American Heart Association,1993, 1992Conference paper (Refereed)
  • 243.
    Eidenvall, Lars
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
    Barclay, S A
    Loyd, Dan
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Applied Thermodynamics and Fluid Mechanics.
    Wranne, Bengt
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Clinical Physiology. Östergötlands Läns Landsting, Heart Centre, Department of Clinical Physiology.
    Ask, Per
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
    Regurgitant heart valve flow from 3D proximal velocity field - continued search for the ideal method1995In: Medical & Biological Engineering & Computing, ISSN 0140-0118, Vol. 33, p. 131-139Article in journal (Refereed)
  • 244.
    Eidenvall, Lars E. J.
    Linköping University, Department of Biomedical Engineering. Linköping University, Department of Medicine and Care, Clinical Physiology. Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Cardiovascular modelling and ultrasound heart flow quantification: aortic flow and mitral regurgitation1993Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The primary objective of this thesis was to model and simulate aortic flow and mitral regurgitation and to improve quantitative ultrasound measurements. The tools used were; theoretical analysis, computer simulation, model experiments, image analysis and clinical evaluation.

    The flow in the aorta is known to be influenced by both cardiac function and vascular characteristics. The influence of vascular characteristics were investigated in a three parameter windkessel model. Peak aortic velocity and acceleration were studied when these parameters were changed. The results indicate that aortic peak flow velocity is related to the compliance of the arterial system while the peak flow acceleration is inversely related to the characteristic impedance of the aorta and large vessels.

    To obtain a correct aortic flow velocity profile from a two dimensional colour flow echocardiographic investigation, a unit which incrementally delayed the ECG signal was designed and used to control the ultrasound scanning. By combining velocity data from incrementally delayed images in a software program, a time corrected profile was obtained.

    In order to determine regurgitant heart valve flow volume, the intensity of the ultrasound continuous wave signal has been suggested as a potential method. Measurements in a hydraulic model showed, however, that the intensity of the signal was, in addition to volume, also related to peak velocity, measuring angle and machine settings. Hence, conclusions drawn about regurgitant grade from the intensity signal require caution.

    Another method for determination of valve regurgitation is to study the laminar and nondisturbed flow in the region of acceleration proximal to the valve, normally the distance from orifice to the first aliased velocity. This was tested first in a steady flow model using colour M mode and colour 2D information, and later in a pulsatile flow model. Four different methods using velocity data from the entire reconstructed 2D velocity vector field were investigated. Model experiments and error calculation showed that flow was best determined by integrating velocities along hemi-spherical lines in two perpendicular planes within an angle of ±45° from the orifice centre line at a distance of approximately 1.2 to 1.4 times the orifice diameter, corresponding to velocities between 0.15 and 0.45 m/s. By combining 2D flow and spectral velocity data, regurgitant volume could be estimated for both circular, diagonal and crescent orifices to within + 15 to -11% from true volume.

  • 245.
    Eidenvall, Lars
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
    Janerot-Sjöberg, Birgitta
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Clinical Physiology. Östergötlands Läns Landsting, Heart Centre, Department of Clinical Physiology.
    Ask, Per
    Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering, Physiological Measurements.
    Loyd, Dan
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Applied Thermodynamics and Fluid Mechanics.
    Wranne, Bengt
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Clinical Physiology. Östergötlands Läns Landsting, Heart Centre, Department of Clinical Physiology.
    2D Doppler Flowvelocity profiles can be time corrected with an external ECG delay device1992In: Journal of the American Society of Echocardiography, ISSN 0894-7317, E-ISSN 1097-6795, Vol. 5, p. 405-413Article in journal (Refereed)
  • 246.
    Ekberg, Kerstin
    et al.
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Department of Health and Society, National Centre for Work and Rehabilitation.
    Eklund, JörgenLinköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.Ellström, Per-ErikLinköping University, Faculty of Arts and Sciences. Linköping University, Department of Behavioural Sciences and Learning, Work and Working Life. Linköping University, Department of Behavioural Sciences and Learning, Learning in Working Life and Educational Settings.Johansson, StinaUmeå universitet.
    Tid för utveckling?2006Collection (editor) (Other academic)
    Abstract [sv]

    Tid, tidsanvändning och tidsbrist i arbetet är i fokus i debatten om de krav som det nya arbetslivet ställer. Vilka konsekvenser får sättet att organisera och rationalisera arbete för lärande, hälsa, jämställdhet och arbetsförhållanden? Forskare från fyra discipliner granskar och jämför skeenden i fyra offentliga organisationer som genomför organisationsförändringar. Boken vänder sig till alla, såväl studerande som yrkesverksamma, som hanterar arbetslivs-, organisations- och ledarskapsfrågor

  • 247.
    Eklund, Jörgen
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    A Quality Systems View on Safety and Reliability - Humans in Interaction with Technology and Organisation2003Other (Other (popular science, discussion, etc.))
    Abstract [en]

       

  • 248.
    Eklund, Jörgen
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Kvalitets- och arbetslivsutveckling under tidsbrist och resursknapphet.2006In: Tid för utveckling? / [ed] Kerstin Ekberg, Lund: Studentlitteratur , 2006, 1, p. 189-202Chapter in book (Other academic)
    Abstract [sv]

         Tid, tidsanvändning och tidsbrist i arbetet är i fokus i debatten om de krav som det nya arbetslivet ställer. Vilka konsekvenser får sättet att organisera och rationalisera arbete för lärande, hälsa, jämställdhet och arbetsförhållanden? Forskare från fyra discipliner granskar och jämför skeenden i fyra offentliga organisationer som genomför organisationsförändringar. Boken vänder sig till alla, såväl studerande som yrkesverksamma, som hanterar arbetslivs-, organisations- och ledarskapsfrågor

  • 249.
    Eklund, Jörgen
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Ledning genom styrning och genom participation2003In: Ledarskap i teamorganiserad verksamhet : en antologi / [ed] Per-Erik Ellström & Henrik Kock, Linköping: Linköpings universitet , 2003, p. 148-158Chapter in book (Other academic)
    Abstract [sv]

      

  • 250.
    Eklund, Jörgen
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Litteraturöversikt, energiförbrukning i brevbärararbete2004Report (Other academic)
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