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  • 101.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    An Introduction to Modelling of Transmission Lines2006Report (Other academic)
    Abstract [en]

          

  • 102.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Computational tools for aircraft system analysis and optimization2008In: 26th International Congress of the Aeronautical Sciences,2008, 2008Conference paper (Other academic)
    Abstract [en]

    In this paper a model based QFD (MB-QFD) is introduced, and the different representations for design analysis of complex systems are discussed. Sensitivity analysis is a useful tool for trade studies and to  achieve an overview of the importance of different aspects of the design. The introduction of an hierarchical aggregated design influence matrix greatly improves the ability to handle large systems. Also an influence matrix of uncertainties is used to trace the impact of uncertainties in the design and to identify hot spots where more effort is needed. Through the QFD "House of quality" it is possible to formulate design objective function in a formal way. Furthermore, functional correlation can be used to analyse coherent and conflicting requirements, and by studying the influence of design parameters on the design objective the most  influential parameters can be selected for optimization. These tools are demonstrated on an aircraft design example.

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  • 103.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Design Space Configuration for Minimizing Design Information Entropy2015In: ICoRD’15 - Research into Design Across Boundaries Volume 1: Theory, Research Methodology, Aesthetics, Human Factors and Education / [ed] Amaresh Chakrabarti, New Delhi, India: Springer India , 2015, p. 51-60Chapter in book (Refereed)
    Abstract [en]

    In this paper concepts for quantitative theory of design are developed. The design process is viewed as a process of increasing the information of the product/system using concept from information theory. The creation and evolution of design space and information entropy are central concepts that are studied in this paper. Furthermore, axiomatic design is discussed in relation to this, and it is shown that the two fundamental axioms are likely to be dependent.

    The design information entropy is used as a state that reflects both complexity and refinement, and it is argued that it can be useful as some measure of design effort and design quality. It provides a tool to describe the relation between a design, and the design space from which it is derived as well as for quantitative description for various aspects of design, both structural information regarding architecture and connectivity, as well as for parameter values, both discrete and continuous. In this paper it is also shown to be useful as a measure of quality when configuring design spaces, such as in  product platforms, and when setting up parameterization for design.

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  • 104.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Disruptive Innovations from Disruption2020In: Journal of Applied Economics and Business Research, E-ISSN 1927-033X, Vol. 10, no 3, p. 129-130Article in journal (Other academic)
    Abstract [en]

    n/a

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  • 105.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Distributed Modelling Techniques for System Simulation2008Report (Other academic)
  • 106.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Distributed Modelling Techniques for System Simulation2007Report (Other academic)
    Abstract [en]

      

  • 107.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Engineering Design Analysis and Synthesis2008Report (Other (popular science, discussion, etc.))
    Abstract [en]

      

  • 108.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Estimation models for concept optimisation of power transformation and transmission2005In: The Ninth Scandinavian International Conference on Fluid power, SICFP¿05,2005, 2005Conference paper (Other academic)
  • 109.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Information Entropy in the Design Process2013In: ICoRD'13: Global Product Development / [ed] Chakrabarti, Amaresh and Prakash, Raghu V., New Delhi Heidelberg New York Dordrecht London: Springer, 2013, p. 101-112Chapter in book (Refereed)
    Abstract [en]

    This book showcases over 100 cutting-edge research papers from the 4th International Conference on Research into Design (ICoRD'13) - the largest in India in this area - written by eminent researchers from over 20 countries, on the design process, methods and tools, for supporting global product development (GPD). The special features of the book are the variety of insights into the GPD process, and the host of methods and tools at the cutting edge of all major areas of design research for its suppo

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    Information Entropy in the Design Process
  • 110.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Post optimal system analysis using aggregated design impact matrix2000In: ASME International Design Engineering Technical Conference Computers and Information inEngineering Conference,2000, 2000Conference paper (Other academic)
  • 111.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Robust Modelling Using Bi-Lateral Delay Lines for High Speed Simulation of Complex Systems2011In: DINAME 2011: 14th International Symposium on Dynamic Problems in Mechanics / [ed] Agenor Toledo Fleury, 2011Conference paper (Other academic)
    Abstract [en]

    A very effective method for modelling and simulation of large complex dynamic systems is represented by distributed modelling using transmission line elements (or bi-lateral delay lines). This method evolves naturally for calculation of pressures when hydraulic pipelines are modelled with distributed parameters, and it can be used to effectively partition the model to use local solvers for the differential equations in each component or subsystem. It is also applicable to other physical systems, such as mechanical, electrical, gas etc.

    One interesting application for distributed solvers using bi-lateral delay lines is in real time simulation, since they are very robust and usually quite large simulation times steps can be used. Modelling for real-time applications puts special requirements on robustness in the numerical methods used. In real-time applications there is no room for decreasing time step in numerically critical stages. Furthermore, if a system is relaying on a real-time simulation for its functionality, failure in the numerical properties is unacceptable. It is also in many applications possible to simulate the system faster than real time, which means that high fidelity system simulation can be used to plan ahead in control applications, and for simulation based optimisation.

    Since solvers can be embedded in components or subsystems, it is very straightforward to implement parallel processing using the multi-core processors which now is the standard for desk top computers. There is also an increasing need in many situations to resolve the time scale to finer details, where the effect of wave propagation needs to be modelled.

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    Robust Modelling Using Bi-Lateral Delay Lines for High Speed Simulation of Complex Systems
  • 112.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Robust Modelling Using Bi-Lateral Delay Lines for Real Time and Faster Than Real Time System Simulation2010In: ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, DETC2009: Volume 2, The American Society of Mechanical Engineers (ASME) , 2010, Vol. 2, no PART A, p. 131-138Conference paper (Refereed)
    Abstract [en]

    A very suitable method for modelling and simulation of large complex dynamic systems is represented by distributed modelling using transmission line elements (or bi-lateral delay lines). This method evolves naturally for calculation of pressures when hydraulic pipelines are modelled with distributed parameters. It is also applicable to other physical systems, such as mechanical, electrical, gas etc. One interesting application for distributed solvers using bi-lateral delay lines is in real time simulation. Modelling for real-time applications puts special requirements on robustness in the numerical methods used. In real-time applications there is no room for decreasing time step in numerically critical stages. Furthermore, if a system is relaying on a real-time simulation for its functionality, failure in the numerical properties is unacceptable. It is also in many applications possible to simulate the system faster than real time, which means that high fidelity system simulation can be used to plan ahead in control applications, and for simulation based optimisation. Copyright © 2009 by ASME.

  • 113.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Robust System Modelling Using Bi-lateral Delay Lines2005In: Simsafe 05,2005, 2005Conference paper (Refereed)
    Abstract [en]

    A very suitable method for modelling and simulation of large complex dynamic systems is represented by dis-tributed modelling using transmission line elements (or bi-lateral delay lines). This method evolves naturally for calculation of pressures when hydraulic pipelines are modelled with distributed parameters. It is also applicable to other physical systems, such as mechani-cal, electrical, gas etc. One interesting application for distributed solvers using bi-lateral delay lines is in real time simulation. Modelling for real-time applications puts special requirements on robustness in the numeri-cal methods used. In real-time applications there is no room for decreasing time step in numerically critical stages. Furthermore, if a system is relaying on a real-time simulation for its functionality, failure in the nu-merical properties is unacceptable.

  • 114.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    System analysis and optimization for tracebility in design2007In: The tenth Scandinavian International conference on Fluid Power,2007, Tampere, Finland: Tempare University of Technology , 2007, p. 289-Conference paper (Refereed)
    Abstract [en]

        

  • 115.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Systems Engineering and Computational Design for Aircraft Systems2004In: EWADE 2004,2004, 2004Conference paper (Refereed)
  • 116.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    The Relation Between Performance, Design Space, Refinement and Information2007In: 2007 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Las Vegas, Nevada, USA: ASME , 2007, p. 1005-1014Conference paper (Refereed)
    Abstract [en]

    Design in general is about increasing the information of the product/system. Therefore it is natural to investigate the design process from an information theoretical point of view. In this paper the design process is described as an information transformation process, where an initial set of requirements are transformed to a system specification. Performance and cost are both functions of complexity and refinement, which can be expressed in information entropy. There are essentially two ways of increasing the information content in a system. One is to reduce tolerances in the design parameters. The other way is to increase the design space, by introducing more features into the design. Both of these aspects of increasing information content are discussed through the establishment of a formal framework. In this way, the relationship between concept refinement and design space expansion can be viewed in information theoretical terms. The information theoretical model is demonstrated on examples. The model has practical implications for the balance between number of design parameters, and the degree of convergence in design optimization. It can also be used to give a rough estimate of number of parameters that are needed for a specified degree of accuracy in the optimization result, or the number of parameters that are meaningful to use under uncertainty.

  • 117.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Transmission line modelling for system simulation2021Report (Other academic)
    Abstract [en]

    This text is about system simulation using transmission line method, TLM, to obtain partitioned models that can be used with local solvers, and can be used for parallel processing. Relaying on local solvers also means that good scaling properties are obtained. This is exemplified with the modelling of diffrerent components for e.g. as electronic, hydraulic and mechanical systems.

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  • 118.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Whole Mission Simulation for Aircraft System Design2009In: AST 2009 Workshop on Aviation System Technology, 2009Conference paper (Other academic)
    Abstract [en]

    Developments in computational hardware and simulation software have come to apoint where it is possible to use whole mission simulation in the preliminary design.This paper address some key issues needed to realize this. These are, systemsimulation using distributed solvers for robust large scale simulation, time scalecompression to deal with the widely different time scales involved, e.g. the transientbehaviour of control surface actuators, to the tracking of fuel consumption. Theapplication is a flight simulation model with subsystems such as control surfaceactuators. In this way it is possible to do real time simulation (RTS) and faster thanreal time simulation (FRTS) of rather complex systems.

  • 119.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Whole Mission Simulation for Aircraft System Design and Optimisation2009In: CEAS 2009 European Air & Space Conference CEAS 2009 European Air & Space Conference / [ed] Mike Steeden, London: Royal Aeronautical Society , 2009Conference paper (Other academic)
    Abstract [en]

    Developments in computational hardware and simulation software have come to a point where it is possible to use whole mission simulation in the preliminary design.  This paper address some key issues needed to realize this. These are, system simulation using distributed solvers for robust large scale simulation, time scale compression to deal with the widely different time scales involved, e.g. the transient behaviour of control surface actuators, to the tracking of fuel consumption. The application is a flight simulation model with subsystems such as control surface actuators. In this way it is possible to do real time simulation (RTS) and faster than real time simulation (FRTS) of rather complex systems.

    Using such models it is possible to do design analysis, e.g sensitivity analysis and trade of analysis, as well as design optimisation, In this paper this is demonstrated on a flight simulation model with subsystems, such as control surface actuators.

  • 120.
    Krus, Petter
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Braun, Robert
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Nordin, Peter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Eriksson, Björn
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Aircraft System Simulation for Preliminary Design2012In: ICAS 2012 CD-ROM PROCEEDINGS / [ed] Professor I Grant, Optimage Ltd , 2012, p. Art.nr. ICAS2012-1.9.3-Conference paper (Other academic)
    Abstract [en]

    Developments in computational hardware and simulation software have come to a point where it is possible to use whole mission simulation in a framework for conceptual/preliminary design. This paper is about the implementation of full system simulation software for conceptual/preliminary aircraft design. It is based on the new Hopsan NG simulation package, developed at the Linköping University. The Hopsan NG software is implemented in C++. Hopsan NG is the first simulation software that has support for multi-core simulation for high speed simulation of multi domain systems.

    In this paper this is demonstrated on a flight simulation model with subsystems, such as control surface actuators.

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  • 121.
    Krus, Petter
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Ericson, LiselottLinköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.Sethson, MagnusLinköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden2017Conference proceedings (editor) (Refereed)
    Abstract [en]

    SICFP2017

    This is the proceedings of the 15th Scandinavian International Conference on Fluid Power held at Linköping University in Sweden on 7-9 June 2017. The theme of the conference was “Fluid Power in the Digital Age”. The contributions are well aligned with this theme, and are indeed reflecting the great developments. We are very grateful to the effort put in by the authors to produce such high quality papers, and also to those taking time to review papers to further enhance the quality. The contributions clearly shows that the fluid power industry, and academia, have both challenges as well as opportunities in keeping up with the evolving capabilities provided by the digitalization. It was with great joy to see old and new colleagues and friends attending our conference and the division of Fluid and mechatronic systems, at Linköping University. The conference is a bi-annual event, with alternating localization between Linköping in Sweden and Tampere in Finland. The process of hosting such an event is a great effort for our organization and I would like to thank all those involved in organizing this conference, and wish good luck with the next one to our Finnish colleagues. Thank you!

    Prof. Petter Krus

    Head of Division

    Fluid and Mechatronic Systems

    Review Process

    Each author attending the conference days had the opportunity to select from three different ways of presenting their contribution. Firstly, a reviewed process with at least two international reviewers of each contribution. The process resulted in most cases with feedback from the reviewers with comments spanning everything between diagram legends to scientific methods. Some proposed papers where rejected upon recommendations from reviewers. Secondly contributions where also presented in industry sessions where the review process where internal only by the staff of the division. A third extended abstract presentation format where also presented during the conference.

    This proceedings contain all presented contributions from the reviewed papers in the first section and thereafter the non-reviewed papers in second section. All reviewed papers are marked in the footer by the acceptance date.

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    Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linkï¿œping, Sweden
  • 122.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Johansson, Björn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Austrin, Lars
    SAAB AB.
    Concept Optimization of Aircraft Systems Using Scaling Models2004In: Recent Advances in Aerospace Actuation Systems and Components,2004, 2004Conference paper (Refereed)
  • 123.
    Krus, Petter
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Jouannet, Christopher
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Whole Mission Simulation for Aircraft Preliminary Design2010In: 48th AIAA Aerospace Sciences Meeting, AIAA , 2010Conference paper (Other academic)
    Abstract [en]

    Developments in computational hardware and simulation software have come to a point where it is possible to use whole mission simulation in the preliminary design. This paper address some key issues needed to realize this. These are, system simulation using distributed solvers for robust large scale simulation, time scale compression to deal with the widely different time scales involved, e.g. the transient behaviour of control surface actuators, to the tracking of fuel consumption. The application is a flight simulation model with subsystems such as control surface actuators. In this way it is possible to do real time simulation (RTS) and faster than real time simulation (FRTS) of rather complex systems. Using such models it is possible to do design analysis, e.g sensitivity analysis and trade of analysis, as well as design optimisation, In this paper this is demonstrated on a flight simulation model with subsystems, such as control surface actuators.

  • 124.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Nyman, J.
    Complete aircraft system simulation for aircraft design - paradigms for modelling of complex systems2000In: International Congress of Aeronautical Sciences,2000, 2000Conference paper (Other academic)
  • 125.
    Krus, Petter
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Sethson, MagnusLinköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.Ericson, LiselottLinköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    13th Scandinavian International Conference on Fluid Power, June 3-5, 2013, Linköping, Sweden2013Conference proceedings (editor) (Refereed)
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    13th Scandinavian International Conference on Fluid Power, June 3-5, 2013, Linköping, Sweden
  • 126.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Ölvander, Johan
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    An Information Theoretical Perspective on Design Optimizartion2004In: 2004 DETC:Design Engineering Technical Conference,2004, 2004Conference paper (Refereed)
  • 127.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Ölvander, Johan
    Linköping University, Department of Mechanical Engineering.
    Optimizing Optimization for Design Optimization2003In: Design Engineering Technical Conferences and Computers and Information in Engineering Conference,2003, New York: ASME Press , 2003Conference paper (Refereed)
    Abstract [en]

    Design optimization is becoming and increasingly important tool for design. In order to have an impact on the product development process it must permeate all levels of the design in such a way that a holistic view is maintained through all stages of the design. One important area is in the case of optimization based on simulation, which generally requires non-gradient methods and as a consequence direct-search methods is a natural choice. The idea in this paper is to use the design optimization approach in the optimization algorithm itself in order to produce an efficient and robust optimization algorithm. The result is a single performance index to measure the effectiveness of an optimization algorithm, and the COMPLEX-RF optimization algorithm, with optimized parameters.

  • 128.
    Krus, Petter
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Ölvander, Johan
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Performance index and meta-optimization of a direct search optimization method2013In: Engineering optimization (Print), ISSN 0305-215X, E-ISSN 1029-0273, Vol. 45, no 10, p. 1167-1185Article in journal (Refereed)
    Abstract [en]

    Design optimization is becoming an increasingly important tool for design, often using simulation as part of the evaluation of the objective function. A measure of the efficiency of an optimization algorithm is of great importance when comparing methods. The main contribution of this article is the introduction of a singular performance criterion, the entropy rate index based on Shannon's information theory, taking both reliability and rate of convergence into account. It can also be used to characterize the difficulty of different optimization problems. Such a performance criterion can also be used for optimization of the optimization algorithms itself. In this article the Complex-RF optimization method is described and its performance evaluated and optimized using the established performance criterion. Finally, in order to be able to predict the resources needed for optimization an objective function temperament factor is defined that indicates the degree of difficulty of the objective function.

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    fulltext
  • 129.
    Krus, Petter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Ölvander, Johan
    Linköping University, Department of Mechanical Engineering.
    Simulation Based Optimisation for Aircraft Systems2004In: SAE Transactions Journal of Aerospace, Vol. 2003, p. 445-453Article in journal (Refereed)
    Abstract [en]

    Modelling and simulation is of crucial importance for system design and optimisation. In aeronautics, simulation has been strong in the area of flight dynamics and control. Modelling and simulation of basic aircraft systems such as hydraulic systems also has a long tradition, and the rapid increase in computational power has now come to a point where complete modelling and simulation of all the sub systems in an aircraft is possible. There are several levels of design from requirement analysis and system architecture down to detail design, and there is a clear danger that systems engineering activities are performed only at the top level of a design. In order to have an impact on the product development process it must permeate all levels of the design in such a way that a holistic view is maintained through all stages of the design. This can be achieved if all design teams can work towards a common system model where the subsystem designs can be tested in an environment where the interaction with other sub-system and the whole aircraft can be studied. In this paper it is discussed how the actuation system control surfaces can be simulated and optimised using a flight dynamics model of the aircraft coupled to a model of the actuation system. In this way the system can be optimised for certain flight condition by "test flying- the system. The distributed modelling approach used, makes it possible to simulate this system much faster than real time on a 650 MHz PC. This means that even system optimisation can be performed in reasonable time.

  • 130.
    Krus, Petter
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Ölvander, johan
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Rydberg, Karl-Erik
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Drive Train Concept Selection for Industrial Robots2011Conference paper (Other academic)
  • 131.
    Landberg, Magnus
    et al.
    Saab Aeronaut, Linkoping, Sweden.
    Hochwallner, Martin
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    NOVEL LINEAR HYDRAULIC ACTUATOR2015In: PROCEEDINGS OF THE ASME/BATH SYMPOSIUM ON FLUID POWER AND MOTION CONTROL, 2015, ASME Press, 2015, no V001T01A054Conference paper (Refereed)
    Abstract [en]

    In the area of linear motion, infinite stroke only is provided by electric actuators today, until now there has been no hydraulic alternative. The novel linear hydraulic actuator consists of two double acting cylinders with a common piston rod. The working principle of this actuator for short movements is that at least one piston is connected to the piston rod and the actuator works like an ordinary hydraulic double acting cylinder. For longer movements one of the pistons is connected alternatively to the piston rod providing the drive. In this way the two pistons are moving the piston rod alternatingly in a kind of rope climbing motion. The critical element is the clamping mechanism which is an already known machine element but used in this new application. Advantages of this concept are as follows: The actuator is compact. Very long strokes and piston rods are allowed without side effects of common cylinders. This property is the origin of the name "infinite cylinder". The cylinder has small chamber volumes and so high hydraulic stiffness and low capacitance. It has also potentially no external leakage. The cylinder can provide twice the rated force for short strokes. Applications for this feature are the plate opening stroke of injection molding machines, or presses with low work to travel stroke ratio, like a press brake. The paper includes a detailed description of the design and the working principle. One critical component is the clamping mechanism which temporarily connects the pistons to the piston rod. The clamping mechanism together with the piston represents a new kind of machine element in the mechanical engineering field. Here the focus will be on the function and the control strategy. With simulation the proposed control strategy and function will be presented and the performance analyzed. The simulation model is backed up by first results from experiments on the early prototype. The experiments carried out so far on the hydraulic clamping mechanism, which is the critical component in the system show very promising results that the required function can be achieved. Furthermore, the function of the whole cylinder has been simulated with good result. For the full paper results from a functioning prototype is also to be expected.

  • 132.
    Landberg, Magnus
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Saab Aeronautics, Linköping, Sweden.
    Sethson, Magnus
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    The Hydraulic Infinite Linear Actuator with Multiple Rods2017In: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden / [ed] Petter Krus, Liselott Ericson, Magnus Sethson, Linköping: Linköping University Electronic Press, 2017, Vol. 144, p. 279-293Conference paper (Other academic)
    Abstract [en]

    Future hydraulic actuation systems can be significantly improved by utilisation of a new type of hydraulic linear actuator technology. By enabling multiple actuating elements, integrated in a compact and lightweight single unit controlled by ordinary directional valves it is possible to achieve a high position accuracy. This is a new way to generate and distribute mechanical linear movement and force by using hydraulic actuators in a cost effective way, in less responsive closed loop systems. This is a variant on the Hydraulic Infinite Linear Actuator, HILA, invention. The technology also represents a new sort of digital hydraulics. The presented technology provides typical hydraulic actuator characteristics with high system pressure and potentially no external oil leakage. It is based on a well-known hydraulic clamping element technology used in a new way, where the piston and the piston rod can quickly be coupled and uncoupled by means of the clamping element in a failsafe way by using well defined incremental steps. HILA in its simplest usage, provides new features to hydraulic cylinders such as providing very long strokes, high rod speed, and small chamber volumes which means high stiffness and low capacitance. The aim of this study is to present a fundamentally new way of using hydraulic actuators. The invention is called the Hydraulic Infinite Linear Actuator with Multiple Rods, HILA MR. The study presents the idea, principles and feasible combinations of the technology. Also applications in the aircraft and robotic field will be presented. 

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    The Hydraulic Infinite Linear Actuator with Multiple Rods
  • 133.
    Larsson, Felix
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Medicine and Health Sciences. Saab AB, Linköping, Sweden.
    Reichenwallner, Christopher
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Medicine and Health Sciences.
    Dell'Amico, Alessandro
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Saab AB, Linköping, Sweden.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    An ontological approach for classifying aircraft actuators2021In: Proceedings of ICAS2021, Shanghai, China, 6th-10th September, 2021., 2021Conference paper (Refereed)
    Abstract [en]

    Today, electrification is a widely discussed topic within all fields of engineering and especially in the field ofaeronautics. Whether electrification of aircraft systems is the only viable option to overcome environmentalissues is a highly complex question which involves many aspects. In this paper, fundamental differences between electrified and hydraulic aircraft actuators are mapped, compared and discussed to understand how andif these systems can be compared without misleading results.

    In this paper, different actuator architectures were collected from literature, classified and analyzed by usingan ontological approach. The classification was created by utilizing defined classes where the class definitioncorresponded to the functional requirements which had to be fulfilled by the actuator architecture.

    This work has shown that ontologies can sufficiently be used for classification of actuator architectures. Thebuilt in reasoner can be used to sort a large set of actuators into comparable classes. Meanwhile, the ontologydefines a framework where important information of the actuators and their components can be stored andstructured.

  • 134.
    Larsson, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    A framework for generating efficient simulation code from declarative models2004In: International Mechanical Engineering Congress,2003, Washington, DC USA: ASME , 2004Conference paper (Refereed)
  • 135.
    Larsson, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Stability analysis of coupled simulation2004In: International Mechanical Engineering Congress,2003, Washington, DC USA: ASME , 2004Conference paper (Refereed)
  • 136.
    Larsson, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    A tool for tracking cause-effect propagations in hydraulic systems2000In: Bath Workshop on Power and Motion Control,PTMC 2000,2000, 2000Conference paper (Other academic)
  • 137.
    Larsson, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Concepts for Multi-Domain Modelling and Simulation2001In: Scandinavian International Conference on Fluid Power,2001, 2001Conference paper (Other academic)
  • 138.
    Larsson, Jonas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Efficient Collaborative Modelling and Simulation with Application to Wheel Loader Design2004In: International Journal of Fluid Power, ISSN 1439-9776, Vol. 5 nr 3, nov 04, no 1Article in journal (Refereed)
  • 139.
    Larsson, L. Viktor
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Ericson, Liselott
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Uebel (Pettersson), Karl
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Volvo Construction Equipment.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Low-Level Control of Hybrid Hydromechanical Transmissions for Heavy Mobile Working Machines2019In: Energies, E-ISSN 1996-1073, Vol. 12, no 9, article id 1683Article in journal (Refereed)
    Abstract [en]

    Fuel efficiency has become an increasingly important property of heavy mobile working machines. As a result, Hybrid Hydromechanical Transmissions (HMTs) are often considered for the propulsion of these vehicles. The introduction of hybrid HMTs does, however, come with a number of control-related challenges. To date, a great focus in the literature has been on high-level control aspects, concerning optimal utilization of the energy storage medium. In contrast, the main topic of this article is low-level control, with the focus on dynamic response and the ability to realize requested power flows accurately. A static decoupled Multiple-Input-Multiple-Output (MIMO) control strategy, based on a linear model of a general hybrid HMT, is proposed. The strategy is compared to a baseline approach in Hardware-In-the-Loop (HWIL) simulations of a reference wheel loader for two drive cycles. It was found that an important benefit of the decoupled control approach is that the static error caused by the system’s cross-couplings is minimized without introducing integrating elements. This feature, combined with the strategy’s general nature, motivates its use for multiple-mode transmissions in which the transmission configuration changes between the modes. 

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    energies-12-01683
  • 140.
    Larsson, L. Viktor
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    A General Approach to Low-Level Control of Heavy Complex Hybrid Hydromechanical Transmissions2018In: BATH/ASME 2018 Symposium on Fluid Power and Motion Control, ASME Press, 2018Conference paper (Refereed)
    Abstract [en]

    This paper focuses on the low-level control of heavy complex hydraulic hybrids, taking stability and the dynamic properties of the included components into account. A linear model which can describe a high number of hybrid configurations in a straightforward manner is derived and used for the development of a general multiple input multiple output (MIMO) decoupling control strategy. This strategy is tested in non-linear simulations of an example vehicle and stability requirements for the low-level actuators are derived. The results show that static decoupling may be used to simplify the control problem to three individual loops controlling pressure, output speed and engine speed. In particular, the pressure and output speed loops rely on fast displacement controllers for stability. In addition, it was found that the decoupling is facilitated if the hydrostatic units have equal response. The low-level control of heavy complex hydraulic hybrids may thus imply other demands on actuators than what is traditionally assumed.

  • 141.
    Larsson, L. Viktor
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Displacement Control Strategies of an In-Line Axial-Piston Unit2017In: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden / [ed] Petter Krus, Liselott Ericson and Magnus Sethson, Linköping: Linköping University Electronic Press, 2017, Vol. 144, p. 244-253Conference paper (Refereed)
    Abstract [en]

    The need for efficient propulsion in heavy vehicles has led to an increased interest in hybrid solutions. Hydraulic hybrids rely on variable hydraulic pumps/motors to continuously convert between hydraulic and mechanical power. This process is carried out via the implementation of secondary control which, in turn, is dependent on a fast displacement controller response. This paper reports on a study of a prototype axial piston pump of the in-line type, in which the displacement is measured with a sensor and controlled using a software-based controller. A pole placement control approach is used, in which a simple model of the pump is used to parametrise the controller using desired resonance and damping of the closed loop controller as input. The controller’s performance is tested in simulations and hardware tests on the prototype unit. The results show that the pole placement approach combined with a lead-compensator controller architecture is flexible, easy to implement and is able to deliver a fast response with high damping. The results will in the future be used in further research on full-vehicle control of heavy hydraulic hybrids.

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    fulltext
  • 142.
    Larsson, L. Viktor
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Hardware-in-the-loop Simulation of Complex Hybrid Hydromechanical Transmissions2018In: WIEFP2018 – 4th Workshop on Innovative Engineering for Fluid Power, November 28-30, Sao Paulo, Brazil, Linköping, 2018, Vol. 156, p. 69-73, article id 014Conference paper (Refereed)
    Abstract [en]

    Fuel efficiency and environmental concerns are factors that drive the development of complex solutions for propulsion in heavy working machines. Although these solutions, such as power-split hydromechanical transmissions and hydraulic hybrids, indeed are promising in terms of energy efficiency, they also tend to increase the dependency on accurate, stable control. The realization of this aspect, in turn, relies on continuous testing throughout the development process, usually carried out on expensive, time-consuming prototypes. To lower the development costs and time, hardware-in-the-loop (HWIL) simulations may be introduced as a middle-way between pure prototyping and computer-based simulations. In this concept, some parts of the transmission are represented as hardware while others are included as mathematical models running in real-time in a data acquisition system. This mix of hardware and software allows for high versatility while maintaining a high level of reliability of the results. This paper reports on parts of a study on HWIL simulations of heavy complex hybrid hydromechanical transmissions. Control algorithms for the hardware/model interface in a test rig are derived and their performance are evaluated in HWIL simulations of a mid-sized wheel loader. The results show the importance of fast rig controllers to capture the fast dynamics of the software simulations. It was also found that an important aspect of HWIL simulations is that they are well aligned with their purpose. If so, the simulation yields more reliable knowledge, which is of higher use in the design process of these complex systems. To summarize, HWIL simulations may, if implemented properly, be an important asset in the development of heavy complex hybrid hydromechanical transmissions.

  • 143.
    Larsson, L. Viktor
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Pettersson, Karl
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Volvo Construction Equipment.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Mode Shifting in Hybrid Hydromechanical Transmissions2015In: ASME/BATH 2015 Symposium on Fluid Power and Motion Control, ASME Press, 2015, p. 13-Conference paper (Refereed)
    Abstract [en]

    Demands for low cost sustainable solutions have increased the use of and interest in complex hydromechanical transmissions for heavy off-road vehicles. In transmissions with multiplemodes, an important condition is to maintain the tractive force during the mode shifting event. For hybrid hydromechanical transmissions, with a direct connection to a hydraulic accumulator, the impressed system pressure caused by the hydraulic accumulator has not yet been observed to interfere with this condition. In this paper, a black box model approach is used to modify the hydraulic system after obtaining knowledge regarding how it is affected by a mode shift. A comparative study is carried out where a full vehicle model of a mobile working machine is simulated with two different hydraulic systems. The results show that different system solutions imply different demands on the included components, and that the mode shifting event is not a negligible factor in heavy hydraulic hybrid vehicles.

  • 144.
    Larsson, Viktor
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Ericson, Liselott
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Hardware-In-the-Loop Simulation of Hybrid Hydromechanical Transmissions2020Conference paper (Other academic)
    Abstract [en]

    Increased demands on fuel-efficient propulsion motivate the use of complex hybrid hydromechanical transmissions in heavy construction machines. These transmissions offer attractive fuel savings but come with an increased level of complexity and dependency on computer-based control. This trend has increased the use of computer-based simulations as a cost-effective alternative to hardware prototyping when developing and testing control strategies. Hardware-In-the-Loop (HWIL) simulations that combine physical and virtual model representations of a system may be considered an attractive compromise that combine the benefits of these two concepts. This paper explores how HWIL simulations may be used to evaluate powertrain control strategies for hybrid hydromechanical transmissions. Factors such as hardware/software partitioning and causality are discussed and applied to a test rig used for HWIL simulations of an example transmission. The results show the benefit of using HWIL simulations in favour of pure offline simulations and prototyping and stress the importance of accurate control with high bandwidth in the HWIL interface.

  • 145.
    Leonel Teixeira, Paulo
    et al.
    University of Federal Santa Catarina, Brazil.
    Vianna Junior, Waldir
    Argohytos AT, Brazil.
    Penteado, Ricardo D.
    Sorg Ind and Comercio, Brazil.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Juliano De Negri, Victor
    University of Federal Santa Catarina, Brazil.
    PRESSURE MODELING AND ANALYSIS OF A SYNCHRONIZED HYDRAULIC PRESS BRAKE WITH VARIABLE-SPEED PUMP2016In: PROCEEDINGS OF THE ASME/BATH SYMPOSIUM ON FLUID POWER AND MOTION CONTROL, 2015, 2016, no V001T01A067Conference paper (Refereed)
    Abstract [en]

    This paper presents a theoretical experimental pressure analysis of a hydraulic press brake with synchronized cylinders. In this machine, the motion of each cylinder is controlled by independent variable-speed electrical motors. This design has many benefits over traditional solutions using hydraulic proportional valves, such as higher energetic efficiency, nonrequirement of a heat exchanger, lower oil-cleanliness requirement, and reduced audible noise. However, a critical characteristic of the press brake is the use of double acting cylinders with large rods controlled by a pump in a closed circuit. In the studied system a cap end area roughly eleven times greater than the rod end area is used. Furthermore, the synchronized hydraulic press brake operates in six stages with particular characteristics implying in different flow rate demands and pressure behaviors. Based on experimental results, the pressures in specific parts of the circuit are analyzed and critical operational conditions are identified. A simulation model using Hopsan is validated and used to propose a hydraulic circuit modification. The proposed solution eliminates the tendency for pump cavitation and pressure surges that occur during the press break operational cycle.

  • 146.
    Locateli, C.C.
    et al.
    Federal University of of Santa CatarinaFlorianópolis, SC, Brazil.
    Teixeira, P.L.
    Federal University of of Santa CatarinaFlorianópolis, SC, Brazil.
    De, Pieri E.R.
    Federal University of of Santa CatarinaFlorianópolis, SC, Brazil.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    De, Negri V.J.
    Federal University of of Santa CatarinaFlorianópolis, SC, Brazil.
    Digital hydraulic system using pumps and on/off valves controlling the actuator2014In: PROCEEDINGS OF THE FPNI PH.D SYMPOSIUM ON FLUID POWER, ASME Press, 2014Conference paper (Refereed)
    Abstract [en]

    Hydraulic systems employed in several industrial and mobile applications present significant advantages, such as a high power-to-weight ratio and fast dynamic response. However, these systems have low efficiency due to high power dissipation. A recent concept called digital hydraulics comprises particularities that create opportunities for a reduction in load loss. This paper proposes a configuration and control method for actuator speed control based on the principles of digital hydraulics. In this context, several fixed displacement units and on/off valves are connected directly to the actuators without throttling valves. The system studied here presents three operation methods (pump mode, motor mode and idle mode), which allows discrete valves to replace continuous or flow control valves in order to control the actuator. Furthermore, a fixed or variable displacement pump with large displacement is replaced by several small, fixed displacement units. Simulations are performed with a co-simulation technique using AMESim and MATLAB. The actuator speed, inlet and outlet pressures on the fixed displacement units and flow rate in the circuit lines are analysed. Preliminary simulation results exhibit smooth transitions between speed levels, adequate dynamic performance, low power dissipation and high energy-storage capacity. A specific limitation of this technology is the obtained actuator discrete speed. The main contributions of this research are the development of a digital hydraulic system configuration and its control strategy, which allows speed control of hydraulic actuators and provides the capacity to store energy.

  • 147.
    Lovaco, Jorge
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Knöös Franzén, Ludvig
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Agent-Based Simulation and Ontology Integration for System-of-System Exploration2022In: IDEAS 2022 conference, 2022Conference paper (Refereed)
    Abstract [en]

    The increasing interest in System-of-Systems (SoS) for engineering applications are introducing new challenges that must be overcome at an early design stage. One of these is the integration of different tools that can be used to make predictions about a system under development and how these together can be used to predict SoS performances by comparison of parameter spaces.The purpose of this paper is therefore to illustrate how different SoS architectures can be modeled, simulated, and evaluated throughout different scenarios by different teams of researchers following a common workflow.An ontology is used as an overarching knowledge base where information about entities, such as scenario details, can be extracted and used for the setup of Agentbased Simulations(ABS) through a tool integration software acting as master that controls the correct execution of the defined workflow.The tool integration software also enables additional modelling capabilities, such as a Design of Experiments (DOE) definition for design space explorations, an Optimizer with different algorithms, user-defined Python scripts, etc. 

  • 148.
    Lovaco, Jorge
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Staack, Ingo
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Environmental Agent-Based Modelling For A Firefighting System Of Systems2022In: 33rd Congress of the International Council of the Aeronautical Sciences, 2022Conference paper (Refereed)
    Abstract [en]

    In the field of System-of-Systems (SoS) engineering, the study of interactions between complex systems froma holistic point of view is important for finding emerging behaviours. To observe as many behaviours aspossible, especially when field testing is not a viable option, simulations play an important role in design spaceexploration and formulation for the Firefighting SoS framework. The presented work describes an AgentBased Model (ABM) approach for simulation of wildfire spread and its detection using collaborating vehicles:Unmanned Aerial Vehicles (UAVs), or partly autonomous air- and land-based vehicles. Implemented in theopen-source software NetLogo, the usage of its Geographic Information System (GIS) extension allows tosimulate scenarios at specific locations. This ABM will be used in the future for Agent-Based Simulations(ABS) for the study of an SoS framework oriented to firefighting, including design and optimization of the SoS,constituent systems and their subsystems.

  • 149.
    Lovén, Eva
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering.
    Managing cooperation and competition in product realisation2004In: 13th International Conference on Management of Technology,2004, ISBN: 0-9712964-6-4: IAMOT , 2004Conference paper (Refereed)
    Abstract [en]

    Cooperation is needed in research and development of new and complex products and processes. The other side of cooperation is competition. In most cases the situation can be described as something in between pure cooperation and pure competition also known as co-opetition The aim with this research is to develop a better understanding of the dynamic of cooperation and competition in product realisation, both on individual, company and macro-level (companies, universities and governments). In empirical research the authors of this article found unobtrusive information about co-opetition in the product realisation process. A literature review has been conducted and different databases have been used to understand co-opetition on different levels - individual, company and macro level. Finally empirical findings concerning cooperation-competition has been reinterpreted. The conclusion from the empirical studies and literature review is that all levels (individual, company and macro level) are important to take into consideration when managing and developing new technology and processes. By better understanding of different forms of collaboration-competition situation at these levels, in the product realisation process, management have the ability to change harmful collaboration-competition situations into more healthy situations and the products reach faster to market.

  • 150.
    Lovén, Eva
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Product Development under Co-opetition2006In: NordDesign,2006, Reykjavik, Iceland: Faculty of Engineering University of Iceland , 2006, p. 131-Conference paper (Refereed)
    Abstract [en]

    Cooperation is needed in product development of integrated products. Collaboration implies both cooperation and competition and in most cases the situation can be described as something in between pure cooperation and pure competition, also known as co-opetition. This paper is dealing with product development under co-opetition. The aim is to get a better understanding of the design engineers- challenges. A literature overview concerning cooperation, co-opetition and competition have been conducted. The literature categorized according to the researchers unit of analysis; individual, company and macro level. The result shows that the different situations confront the design engineers with completely different questions.

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