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  • 51.
    Gavel, Hampus
    et al.
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Ölvander Andersson, Johan
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Johansson Lundén, Björn
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Aircraft fuel system synthesis aided by interactive morphology and optimization2007In: 45th AIAA Aerospace Sciences Meeting and Exhibit, Reno, USA, Reno,USA: AIAA , 2007, no AIAA-2007-0653Conference paper (Refereed)
  • 52.
    Gavel, Hampus
    et al.
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Ölvander (Andersson), Johan
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Optimal Conceptual Design of Aircraft Fuel Transfer Systems2006In: Journal of Aircraft, ISSN 0021-8669, Vol. 43, no 5, p. 1334-1340Article in journal (Refereed)
    Abstract [en]

     

    This paper describes early considerations that have to be made when designing an aircraft fuel system. Emphasis is placed on illustrating the impact of top-level aircraft requirements on low-level practicalities such as fuel system design. Choosing between concepts is one of the most critical parts of any design process. Different concepts have different advantages, and the concept that is the best choice is often dependent on the top-level requirements. This paper shows how optimization has been used successfully at Saab Aerospace as a tool that supports concept selection. The example studied is the design of a fuel transfer system for a ventral drop tank and the optimization results in different conceptual designs depending on the top-level requirements.

     

  • 53.
    Gavel, Hampus
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Ölvander, Johan
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    A quantified relationship matrix aided by optimization and probabilistic design2008In: 26th Congress of the International Council of the Aeronautical Sciences,2008, Anchorage: ICAS , 2008Conference paper (Refereed)
  • 54.
    Hallberg, Peter
    et al.
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Andersson, Henric
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Nåbo, Mats
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Modular sustainable light multi-purpose vehicle2008In: EET-2008 European Ele-Drive Conference,2008, 2008Conference paper (Refereed)
    Abstract [en]

    In contrast to the major vicissitude faced by the transportation sector in developed countries due to environmental or political reasons, this contribution mainly fits into the discussion on how to make emerging markets adopt sustainable personal vehicles other than automobiles. A modularised light electric vehicle transportation system is presented.

    Furthermore, the vehicles included in the presented system would also hold properties suited for transportation needs in developed countries. One issue would be not only a smaller environmental footprint, but also a more attractive physical footprint, in the sense that actual space is a matter of economy in densely urbanised areas.

  • 55.
    Hallberg, Peter
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Austrin, Lars
    Saab AB.
    Low Cost Demonstrator As A Mean For Rapid Product Realization With An Electric Motorcycle Application2005In: 2005 ASME International Design Engineering Technical Conferences Computers and Information In Engineering Conference - 31st Design Automation Conference, 2005: Volume 2: 31st Design Automation Conference, Parts A and B, 2005Conference paper (Other academic)
    Abstract [en]

    During the last decade, digital prototyping has become a natural part of any industrial project dealing with product development. The reasons for this differ, but the two most obvious is time saving aspects and the amount of cost effectiveness achieved when replacing the physical prototype with the cheaper digital. Time and cost are equally, or even more critical in academic projects. This paper describes the usage of a low cost demonstrator as a mean to reduce both time and cost during a product development project course as well as to guarantee educational quality. The paper also discusses the reason for using demonstrators in an industrial environment. When large product development project courses are given at educational engineering programs, they often strive for imitating a real industrial situation, trying to include all the phases and aspects of product realization. Time is of course critical in both environments, industrial and academic, but for slightly different reasons. A typical industrial project may run over several years while a large educational project-s duration is counted in months. Thus, if the course tutor wants to simulate the whole product development process, within the same project course, there are needs for means that may speed up the project without spoiling the educational message as well as the industrial authenticity.

  • 56.
    Hallberg, Peter
    et al.
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Johansson, Björn
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Redsigning Mature Products for Substainability2006Conference paper (Other academic)
    Abstract [en]

    This contribution will discuss engineering design projects with various environmental and sustainable objectives. The automotive industry is facing a major vicissitude regarding the system layouts of their products. Given the rapidly increasing demands for environmentally acceptable and sustainable vehicles, developed even faster and under increasing competition, one could expect a future, or a period of transition, where a “market pull”-situation will exact design methods more adapted for new propulsion technologies such as fuel cells, bio-fuels, hybrid configurations and so forth. When looking at two-wheeled vehicles it is also a matter of a dramatic change in the safety requirements that would affect the design process in a similar way.

    This paper presents studies made regarding development of two-wheeled vehicles with strict safety, environmental and sustainability requirements. It also describes what happens when a very mature product, such as a conventional motorcycle, undergoes dramatic changes in propulsion system and safety features and becomes technically immature, but still has to preserve its traditional values in the eyes of the consumer. Over the last two years, the Department of Mechanical Engineering at Linköping University has conducted various projects dealing with these issues using rapid, low-cost, demonstrator development together with digital models. The demonstrator is used as a vehicle to evaluate the integration of technology, as well as less tangible aspects such as ergonomics, drivability, appeal, visual impression etc. This approach has proven particularly fruitful when dealing with new technologies with a high level of innovation. The rapid nature of these projects also makes them suitable for exploring digital collaboration tools aimed at controlling and speeding up the design process.

  • 57.
    Hochwallner, Martin
    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.
    Hydraulic Infinite Linear Actuator: The Ballistic Gait Digital Hydro-Mechanical Motion2017In: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden DOI: https://doi.org/10.3384/ecp17144 / [ed] Petter Krus, Liselott Ericson and Magnus Sethson, Linköping: Linköping University Electronic Press, 2017, Vol. 144, p. 10-17Conference paper (Refereed)
    Abstract [en]

    The Hydraulic Infinite Linear Actuator, HILA, has been presented in previous publications. The novel actuator consists of one, two or more double-acting cylinders witha common piston rod and hydraulically detachable pistons. In the basic gait, one cylinderalternatingly engages and drives the load while the other retracts. The HILA thus works in akind of rope-climbing motion. The concept also allows other gaits, i.e. patterns of motion.This contribution focuses on the ballistic gait, a pattern of motion where one cylinder engagesto give the load a push. The load then carries on with its motion by inertia, cylinders disen-gaged. The actuator thus realizes hydro-mechanical pulse-frequency modulation (PFM).This gait is energy efficient and able to recuperate energy.

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    Hydraulic Infinite Linear Actuator: The Ballistic Gait Digital Hydro-Mechanical Motion
  • 58.
    Hochwallner, Martin
    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.
    Motion Control Concepts For The Hydraulic Infinite Linear Actuator2017Conference paper (Refereed)
    Abstract [en]

    This contribution presents the novel Hydraulic Infinite Linear Actuator (HILA). It focuses on the control of motion and is based on simulation and analysis. The novel actuator consists of two symmetric double acting cylinders with a common piston rod and hydraulically detachable pistons. Alternatingly one cylinder engages and drives the load while the other retracts, the HILA thus works in a kind of rope climbing motion. The purpose of this contribution is to study the motion control of the HILA and to mimic the behaviour of a conventional cylinder. The HILA has three degrees of freedom which are temporarily coupled compared with one in a conventional cylinder. Further, the HILA with the chosen hydraulic system has two continuous and two digital control inputs. The challenge to be tackled is to combine the short stroke back and forth motions of the cylinders into a continuous smooth motion of the whole actuator. Results from simulations and analyses show that the investigated concepts can keep the jerk within acceptable limits for many applications.

  • 59.
    Hochwallner, Martin
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Linköping University, Department of Management and Engineering, Manufacturing Engineering.
    Pinto, Lie
    Linköping University, Department of Management and Engineering. 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.
    Tracking Control for High-Performance Motion of a Hydraulic Infinite Linear Actuator2018In: IEEE/ASME transactions on mechatronics, ISSN 1083-4435, E-ISSN 1941-014X, Vol. 23, no 6, p. 2782-2793Article in journal (Refereed)
    Abstract [en]

    The concept of the hydraulic infinite linear actuator consists of two double-acting cylinders with hydraulically detachable pistons driving a common rod. Alternatingly, one cylinder engages and drives the load, whereas the other retracts; the actuator, thus, works in a kind of rope-climbing motion. The actuator has three degrees of freedom, which are temporarily coupled compared with one in a conventional cylinder. Hence, the actuator is a hybrid system with both continuous and discrete states and control inputs. This paper presents a tracking control problem and a solution for high-performance motion, which is interpreted as utilizing the hardware limits in the sense of velocity, accuracy, smoothness, and usability. The concept is demonstrated by simulation for the case of a rest-to-rest motion, but the intended use cases also include arbitrary trajectories.

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    fulltext
  • 60.
    Hugo, Anton
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Pettersson, Karl
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Heybroek, Kim
    Volvo Construction Equipment AB, Eskilstuna, Sweden.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Modelling and Control of a Complementary Energy Recuperation System for Mobile Working Machines2013In: / [ed] Petter Krus, Magnus Sethson, Liselott Ericson, Linköping: Linköping University Electronic Press, 2013, p. 21-30Conference paper (Refereed)
    Abstract [en]

    The concept of hybrid technologies for mobile working machines has gained increased attention in recent years. This paper deals with a parallel hybrid system for energy recuperation based on a two-machine hydraulic transformer. The system can be connected hydraulically to an existing hydraulic circuit as a complementary add-on system. The linear analysis of the system visualises the control difficulties coming from a low inertia, slow control dynamics of the machines and the non-linear stick-slip friction during low speeds. A control strategy based on linear control methods is proposed and evaluated in a hardware test bench. It is shown that an acceptable performance can be achieved even with fairly simple models. Additionally, a start-up procedure is proposed to start the transformer from zero speed

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  • 61.
    Hällqvist, Robert
    et al.
    Systems Simulation and Concept Design, Saab Aeronautics, Linköping, Östergötland, Sweden.
    Braun, Robert
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Eek, Magnus
    Innovation and Technology Management, Saab Aeronautics, Linköping, Sweden.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Optimal Selection of Model Validation Experiments: Guided by Coverage2021In: Journal of Verification, Validation and Uncertainty Quantification, ISSN 2377-2158, Vol. 6, no 3Article in journal (Refereed)
    Abstract [en]

    Modeling and Simulation (M&S) is seen as a means to mitigate the difficulties associated with increased system complexity, integration, and cross-couplings effects encountered during development of aircraft subsystems. As a consequence, knowledge of model validity is necessary for taking robust and justified design decisions. This paper presents a method for using coverage metrics to formulate an optimal model validation strategy. Three fundamentally different and industrially relevant use-cases are presented. The first use-case entails the successive identification of validation settings, and the second considers the simultaneous identification of n validation settings. The latter of these two use-cases is finally expanded to incorporate a secondary model-based objective to the optimization problem in a third use-case. The approach presented is designed to be scalable and generic to models of industrially relevant complexity. As a result, selecting experiments for validation is done objectively with little required manual effort.

  • 62.
    Hällqvist, Robert
    et al.
    Systems Simulation and Concept Design, Saab Aeronautics, Linköping, Sweden.
    Braun, Robert
    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.
    Early Insights on FMI-based Co-Simulation of Aircraft Vehicle Systems2017In: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden / [ed] Petter Krus, Liselott Eriksson and Magnus Sethson, Linköping: Linköping University Electronic Press, 2017, Vol. 144, p. 262-270Conference paper (Other academic)
    Abstract [en]

    Modelling and Simulation is extensively used for aircraft vehicle system development at Saab Aeronautics in Linköping, Sweden. There is an increased desire to simulate interacting sub-systems together in order to reveal, and get an understanding of, the present cross-coupling effects early on in the development cycle of aircraft vehicle systems. The co-simulation methods implemented at Saab require a significant amount of manual effort, resulting in scarcely updated simulation models, and challenges associated with simulation model scalability, etc. The Functional Mock-up Interface (FMI) standard is identified as a possible enabler for efficient and standardized export and co-simulation of simulation models developed in a wide variety of tools. However, the ability to export industrially relevant models in a standardized way is merely the first step in simulating the targeted coupled sub-systems. Selecting a platform for efficient simulation of the system under investigation is the next step. Here, a strategy for adapting coupled Modelica models of aircraft vehicle systems to TLM-based simulation is presented. An industry-grade application example is developed, implementing this strategy, to be used for preliminary investigation and evaluation of a cosimulation framework supporting the Transmission Line element Method (TLM). This application example comprises a prototype of a small-scale aircraft vehicle systems simulator. Examples of aircraft vehicle systems are environmental control systems, fuel systems, and hydraulic systems. The tightly coupled models included in the application example are developed in Dymola, OpenModelica, and Matlab/Simulink. The application example is implemented in the commercial modelling tool Dymola to provide a reference for a TLM-based master simulation tool, supporting both FMI and TLM. The TLM-based master simulation tool TLMSimulator is investigated in terms of model import according to the FMI standard with respect to a specified set of industrial needs and requirements.

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  • 63.
    Hällqvist, Robert
    et al.
    Saab AB Aeronautics, Linköping, Sweden.
    Eek, Magnus
    Swedish National Road and Transport Research Institute (VTI), Linköping, Sweden.
    Braun, Robert
    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.
    Toward Objective Assessment of Simulation Predictive Capability2023In: Journal of Aerospace Information Systems, ISSN 1940-3151, Vol. 20, no 3, p. 1-16Article in journal (Refereed)
    Abstract [en]

    Two different metrics quantifying model and simulator predictive capability are formulated and evaluated; both metrics exploit results from conducted validation experiments where simulation results are compared to the corresponding measured quantities. The first metric is inspired by the modified nearest neighbor coverage metric and the second by the Kullback?Liebler divergence. The two different metrics are implemented in Python and in a here-developed general metamodel designed to be applicable for most physics-based simulation models. These two implementations together facilitate both offline and online metric evaluation. Additionally, a connection between the two, here separated, concepts of predictive capability and credibility is established and realized in the metamodel. The two implementations are, finally, evaluated in an aeronautical domain context.

  • 64.
    Hällqvist, Robert
    et al.
    Systems Simulation and Concept Design, Saab Aeronautics, Linköping, Sweden.
    Schminder, Jörg
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics. Linköping University, Faculty of Science & Engineering.
    Eek, Magnus
    Systems Simulation and Concept Design, Saab Aeronautics, Linköping, Sweden.
    Braun, Robert
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Gårdhagen, Roland
    Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics. 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 Novel FMI and TLM-based Desktop Simulator for Detailed Studies of Thermal Pilot Comfort2018In: ICAS congress proceeding, International Council of the Aeronautical Sciences , 2018, article id ICAS2018_0203Conference paper (Other academic)
    Abstract [en]

    Modelling and Simulation is key in aircraft system development. This paper presents a novel, multi-purpose, desktop simulator that can be used for detailed studies of the overall performance of coupled sub-systems, preliminary control design, and multidisciplinary optimization. Here, interoperability between industrially relevant tools for model development and simulation is established via the Functional Mockup Interface (FMI) and System Structure and Parametrization (SSP) standards. Robust and distributed simulation is enabled via the Transmission Line element Method (TLM). The advantages of the presented simulator are demonstrated via an industrially relevant use-case where simulations of pilot thermal comfort are coupled to Environmental Control System (ECS) steadystate and transient performance.

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    fulltext
  • 65.
    Johansson, Björn
    et al.
    Linköping University, Department of Mechanical Engineering.
    Austrin, L
    Engdahl, G
    Krus, Petter
    Linköping University, Department of Mechanical Engineering.
    Tools and methodology for collaborative Systems design applied on more electric aircraft2004In: International council of the aeronautical sciences, ICAS2004,2004, 2004Conference paper (Refereed)
  • 66.
    Johansson, Björn
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Jouannet, Christopher
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Distributed aircraft analysis using web service technology2003In: SAE Technical Paper, 2003, p. 2003-01-3007-Conference paper (Refereed)
    Abstract [en]

    The design modern aircraft requires integration of multidisciplinary models for analysis in early design phase to increase the chances of a successful project. In this paper, a framework for distributed aircraft analysis in the conceptual design including several domains is presented. The framework is based on so-called W eb service standards, allowing integration of distributed models for system simulation and optimization using standardized interfaces. The analysis is controlled by a so-called sequencer which manages the interaction between simulation modules and an XML-based design data repository. This repository includes all design data and an executable process description defining the sequence for execution of the modules.

    In the paper, the framework with underlying concepts is described. The approach is further illustrated using the design of an Unmanned Aerial Vehicle as an example. This includes the definition of the simulation modules, the process model and definition and execution of an optimization problem.

  • 67.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Jouannet, Christopher
    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.
    Distributed aircraft analysis using web service technology2004In: The World Aviation Congress,2003, Montreal, Canada: World Aviation Congress , 2004Conference paper (Refereed)
  • 68.
    Johansson, Björn
    et al.
    Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
    Jouannet, Christopher
    Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
    Distributed aircraft analysis using web service technology2003In: SAE Transactions Journal of Aerospace, ISSN 0096-736X, Vol. 112, no 1, p. 445-453Article in journal (Refereed)
    Abstract [en]

    The design of modern aircraft requires the integration of multidisciplinary mouels for analysis in the early design phase to increase the chances of a successful project. In this paper, a framework for distributed aircraft analysis in the conceptual design including several domains is presented. The framework is based on so-called Web Service Standards, allowing integration of distributed models for system simulation and optimization using standardized interfaces. The analysis is controlled by a so-called sequencer which manages the interaction between simulation modules and an XML-based design data repository. This repository includes all design data and an executable process description defining the sequence for execution of the modules. In the paper, the framework with its underlying concepts is described. The approach is further illustrated using thedesign of an Unmanned Aerial Vehicle as an example. This includes the definition of the stimulation modules, the process model, and definition and execution of an optimization problem.

  • 69.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    A newservice approach for model integration in computational design2004In: Computers and Information in Engineering Conference,2003, Chicago, USA: ASME , 2004Conference paper (Refereed)
  • 70.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Modelica in a Distributed Environment Using Transmission Line Modelling2000In: Modelica 2000 Workshop,2000, 2000Conference paper (Other academic)
    Abstract [en]

       

  • 71.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Probabilistic Analysis and Design Optimization of Modelica Models2005In: 4th International Modelica Conference,2005, Hamburg: The Modelica Association , 2005, p. 247-Conference paper (Refereed)
  • 72.
    Johansson, Björn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    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.
    Distrubuted Modelling: Object Oriented Implementation with Modelica and Transmission Lines2000In: Bath Workshop on Power Transmission and Motion Control, PTMC 2000,2000, 2000Conference paper (Other academic)
    Abstract [en]

      

  • 73.
    Johansson, Olof
    et al.
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Andersson, Henric
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Conceptual Design Using Generic Object Inheritance2008In: ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference: Volume 3: 28th Computers and Information in Engineering Conference, Parts A and B, New York: American Society of Mechanical Engineers, ASME , 2008, p. 931-941Conference paper (Refereed)
    Abstract [en]

    Conceptual design for complex products like aircraft and power plants requires a considerable effort since the product models become very large if they are to cover all important aspects for different stakeholders. To cope with this overall effort, designers have to rely on legacy designs and reuse, and improve the product concepts incrementally between product generations.

    This paper describes a generalized inheritance mechanism we call generic object inheritance that enables quick reuse and modification of conceptual product models at any level in their hierarchical break down structures. By facilitating reuse of conceptual models of previously well studied products, more time can be spent on developing the parts that contain the edge of a new product generation. This enables keeping the modified concepts in context of a complete analyzable product model where the impact of changes can be studied without having to maintain multiple copies of the same object structures.

    The paper describes how generic object inheritance is used for developing the next version of a conceptual product model of a small business jet, while reusing the essential parts of the previous version with minor modifications to design parameters and substructures.

    The design and core mechanisms of generic object inheritance are briefly described, and illustrated with examples from the case study.

  • 74.
    Johansson, Olof
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, PELAB - Programming Environment Laboratory.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Configurable Design Matrixes For Systems Engineering Applications2006In: ASME International Design Engineering Technical Conferences Computers in Engineering Conference,2006, Philadelphia, USA: ASME , 2006Conference paper (Other academic)
  • 75.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Andersson, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Sethson, Magnus
    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.
    Design process for micro air vehicles2003In: Bristol International UAV systems conference,2003, Bristol, UK: UAV , 2003Conference paper (Refereed)
    Abstract [en]

      

  • 76.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems.
    Berry, Patrick
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design.
    Aircraft design education at Linköpings University2007In: Proceedings of the Institution of Mechanical Engineers. Part G, Journal of Aerospace Engineering, ISSN 0954-4100, E-ISSN 2041-3025, ISSN 0954-4100, Vol. 221, no 2, p. 217-224Article in journal (Refereed)
    Abstract [sv]

    Aircraft design is a complex multi-disciplinary task and teaching can easily tend to be too theoretical, not providing the students the tools they need to successfully participate in industrial projects. The approach chosen at Linköping University is intended to create the right balance between theory and practice, and to place the student in the centre of the problem, in order to achieve an overall perspective of the aircraft design process. This article presents in brief layout of the courses, and in more detail, the aircraft design project course given in the last year of the aeronautical masters program, where flying hardware is designed and build, in response to a design challenge. © IMechE 2007.

  • 77.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems .
    Berry, Patrick
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    MANTA - From conceptual design to flight test2005In: European Workshop on Aircraft Design Education,2005, 2005Conference paper (Other academic)
  • 78.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Eguerev Rib. Da Silv, Sergio
    Linköping University, Department of Mechanical Engineering.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering.
    Use of CAD Tools for Weight Estimation in Aircraft Conceptual Design2004In: 24th International Congress of the Aeronautical Sciences,2004, 2004Conference paper (Other academic)
  • 79.
    Jouannet, Christopher
    et al.
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Aircraft manoeuvers simulation, steady and unsteady aerodynamic2003In: SAE Technical Paper, Montreal, Canada: World Aviation Congress , 2003, p. 2003-01-3034-Conference paper (Refereed)
    Abstract [en]

    The current work present a simple model to integrate non-linear aerodynamic in conceptual design phase, before wind tunnel testing. A presentation of a simple pitch up maneuver based on three different aerodynamic models is simulated. The simulation indicates different behaviors depending on the aerodynamic model, and shows the importance of including unsteady aerodynamic.

  • 80.
    Jouannet, Christopher
    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.
    An empirical model for delta wing vortex breakdown location in sideslip condition2003In: Atmospheric flight mechanics,2003, Austin, USA: AIAA , 2003Conference paper (Refereed)
    Abstract [en]

      

  • 81.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems .
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    An Empirical Model for Delta Wing Vortex Breakdown Location in Sideslip Condition2003In: AIAA Atmospheric Flight Mechanics Conference and Exhibit,2003, USA: AIAA , 2003Conference paper (Refereed)
  • 82.
    Jouannet, Christopher
    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.
    Direct Simulation Based Optimization for Aircraft Design Including Systems2006In: AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference,2006, Portsmouth, USA: AIAA/ISSMO , 2006Conference paper (Other academic)
  • 83.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems .
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Direct Simulation-Based Optimization for Aircraft Conceptual Design2007In: AIAA ATIO Conf,2007, USA: AIAA , 2007Conference paper (Refereed)
  • 84.
    Jouannet, Christopher
    et al.
    Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
    Influences of unsteady aerodynamic in conceptual designManuscript (preprint) (Other academic)
    Abstract [en]

    Integration of unsteady and high-angles aerodyuamics is often done late in aircraft design. An attempt to integrate these aspects in conceptual and preliminary design is presented here. A simple aerodynamic model has been developed and used in conceptual design to study the influences of dynamic effects on platform geometry during high angular rate manoeuvres. In order to include these effects in conceptual design, flight simulation has been coupled with classic sizing and turn rate performance is included in the requirements for conceptual sizing. In one case, the sizing and simulation are performed with static aerodynamics, in the other case dynamic effects are included . The impact of large augular rate and its significance for open loop simulation is presented in the form of a pitch up manoeuver.

  • 85.
    Jouannet, Christopher
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Lift Coefficient Predictions for Delta Wing Under Pitching Motions2002In: 32nd AIAA Fluid Dynamics Conference Proceedings (2002), USA: AIAA , 2002, p. AIAA-2002-2969-Conference paper (Refereed)
    Abstract [en]

    An analytic prediction method is presented to estimate the lift coefficient of delta wings under pitching motions. The method is based on the leading edge suction analogy, with regards to the dynamic effect resulting in the unsteady behaviour. The goal of the method is to provide suitable lift equation for use in simulation in preliminary design.

  • 86.
    Jouannet, Christopher
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Modeling of Unsteady Aerodynamic Charactersitics of Delta Wings2002In: Proceedings 23rd International Congress of Aeronautical Sciences (ICAS), Toronto: ICAS , 2002Conference paper (Refereed)
    Abstract [en]

    An analytic prediction model is presented to estimate aerodynamic coefficient of delta wing undergoing dynamic motions. The model is based on the introduction of a state space variable describing the vortex breakdown. This model will be suitable for modeling of flight dynamics in the preliminary design phase.

  • 87.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems .
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Modelling of High Angle of Attack Aerodynamic2007In: AIAA Applied Aerodynamics Conference,2007, USA: AIAA , 2007Conference paper (Refereed)
  • 88.
    Jouannet, Christopher
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems .
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Modelling of High Angle of Attack Aerodynamic, a State-Space Approach2006In: AIAA Applied Aerodynamics Conference,2006, USA: AIAA , 2006Conference paper (Refereed)
  • 89.
    Jouannet, Christopher
    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.
    Sideslip effect on a series of delta wings, flow visualization results2003In: International Conference on Advanced Engineering Design,2003, Prague, Czech republic: Advanced Engineering Design , 2003Conference paper (Refereed)
    Abstract [en]

        

  • 90.
    Jouannet, Christopher
    et al.
    Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
    Unsteady aerodynamic modelling: a simple state-space approach2005In: Proc. of 43rd AIAA Annual Meeting and Exhibits, Reno, Nevada: AIAAA , 2005Conference paper (Refereed)
    Abstract [en]

    A simple mathematical prediction model for high angles of attack aerodynamics, including dynamic effect over delta wings, and an extension to full configuration is presented. The model presented is intended for application in conceptual design and is extended to parameters identifications in preliminary design with validation against experimental data. The aerodynamic model is based on leading edge suction analogy. In order to extend it to high angles of attack and dynamic motions, internal state variables are used to describe the different flow conditions, or state, over the wing/aircraft. In conceptual design the parameters used are determined from geometrical considerations and analogies with delta wings. To extend the mathematical mode to later design phases and augment the accuracy, the parameters are determined from wind tunnel data, in static case the present model has been extended to sideslip. The results obtained shows high accuracy in both static and dynamic cases.

  • 91.
    Jouannet, Christopher
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Lundström, David
    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.
    Sobron, Alejandro
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Annes da Silva, Roberto Gil
    Instituto Tecnológico de Aeronáutica, São José dos Campos, Brazil.
    Catalano, Fernando
    USP, San Carlos, Brazil.
    Greco, Paulo
    USP, San Carlos, Brazil.
    Aerodynamic database of a subscale demonstrator2017In: 35th AIAA Applied Aerodynamics Conference, Reston, VA, USA, 2017, article id 2017-4075Conference paper (Refereed)
    Abstract [en]

    This paper reports the current status of a joint Swedish-Brazilian research project aiming at exploring sub scale flight testing. A 13% scale fighter aircraft is used as a test bench for developing methods and procedures for data acquisition. This paper will present an aerodynamic database as a partial result of the collaborative project.

  • 92.
    Jouannet, Christopher
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Silva, Sergio E. R.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Wing weight estimation using an automated CAD-modelManuscript (preprint) (Other academic)
    Abstract [en]

    Advantages and possibilities offered by modern CAD tools in conceptual design are discussed. In order to illustrate these possibilities, a Computer Integrated (CI) method to estimate weight in conceptual design is presented. The CI method is based on geometry and simple load analysis; the weight is determined from a 3D computer model. The CI method is a compromise between empirical methods and time-consuming methods based on finite element analysis. The CI method allows investigation of unconventional and conventional configuration, and possibility of creating different structure layouts. The method has been applied on commercial aircraft for validation. The presented results have been compared with, other available methods in conceptual design. In addition to weight estimation, modern CAD programs offer integration and data exchange with other domains such as computational fluid dynamics, system simulation and production analysis and planning.

  • 93.
    Knöös Franzén, Ludvig
    et al.
    Linköping University, Faculty of Science & Engineering. Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems.
    Munjulury, Raghu Chaitanya
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Technical Management & Maintenance, Airframe & Vehicle Systems, Saab Aeronautics, Sweden.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Ontology-Assisted Aircraft Concept Generation2022In: 33rd Congress of the International Council of the Aeronautical Sciences, Stockholm, Sweden, 2022Conference paper (Refereed)
    Abstract [en]

    This paper presents a method for generating a geometrical representation of a concept aircraft from an ontology description. An ontology is used as an overarching knowledge base where entities, such as required functions, their design alternatives, and requirements can be represented. Description logic reasoning is then used to process the available design space and generate suitable concepts to fulfil desired functions, as well as indicate suitable approaches for a subsequent sizing procedure. As ontology representations are limited in terms of numerical calculation capabilities, the obtained concept information must be extracted for additional processing. Further investigations, such as statistical analyses, are consequently performed in order to expand the available information of the concept generated from the ontology. This expansion is performed to obtain estimates of required inputs for a continued geometrical sizing procedure. The outcome of the method is an estimation of the concept’s geometry and its characteristics. This information can from here be reintroduced into the ontology representation for further processing and to expand the original knowledge base. A case study is introduced to test the proposed method and to show how it can be used to estimate the characteristics of an already existing aircraft from basic requirements and configuration details. The results from the method and sizing are also compared with publicly available data for the reference aircraft to see how accurate the estimates were.

  • 94.
    Knöös Franzén, Ludvig
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Schön, Sofia
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, Faculty of Science & Engineering.
    Papageorgiou, Athanasios
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, Faculty of Science & Engineering.
    Staack, Ingo
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Arts and Sciences.
    Ölvander, Johan
    Linköping University, Department of Management and Engineering, Machine Design. 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.
    Amadori, Kristian
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, Faculty of Science & Engineering.
    Jouannet, Christopher
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    A System of Systems Approach for Search and Rescue Missions2020Conference paper (Refereed)
    Abstract [en]

    System-of-Systems Engineering (SoSE) has become a constantly growing field within product development for complex systems. Systems are becoming more and more connected with other systems and the operational environment in general. This takes the development process to new levels of complexity where high degrees of uncertainties are expected due to ever occurring changes in the operational environment, and other external factors such as politics, economy, and technology. This creates a need of being able to understand the influence of changes early in the development process and to facilitate the systems? perseverance. The focus of the development shifts from fulfilling specific requirements, to being able to meet needs and deliver capabilities over time. Additionally, modeling and simulation for complex systems and System-of-Systems (SoS) becomes a valued alternative to the economically prohibited and almost impossible prototype testing. In consideration of this problem, the presented work introduces a method for both modeling and simulation of a SoS. The method uses ontology with description logic reasoning to derive and narrow down a SoS design space which is further analyzed using Agent Based Simulation (ABS). A Search and Rescue (SAR) scenario is used as a case study to test the method. Measures of Effectiveness (MoE), based on the time it takes to find a rescue subject and the cost of doing so, are used to evaluate the SoS performances. The presented method is envisioned to be used early in the development of complex systems and SoS to increase the overall understanding of them.

  • 95.
    Knöös Franzén, Ludvig
    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 Arts and Sciences.
    Jouannet, Christopher
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Overall Design and System Integration, Saab Aeronautics, Linköping, Sweden.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    An Ontological Approach to System of Systems Engineering in Product Development2019In: Linköping Electronic Conference Proceedings 162 (2019) / [ed] Dr. Ingo Staack and Prof. Petter Krus, Linköping: Linköping University Electronic Press, 2019, Vol. 162:4, p. 35-44Conference paper (Refereed)
    Abstract [en]

    This paper presents an approach to system-of-systems engineering for product development with the use of ontology. A proposed method for building as well as using ontology to generate and explore system-of-systems design spaces based on identified system-of-system needs is presented. The method is largely built to cover the first levels of related work, where a process for system of systems in the context of product development is introduced. Within this work, it is shown that scenarios for a system-of-systems can be used to identify needs and subsequently the system-of-systems capabilities that fulfils them. The allocation of capabilities to possible constituent systems is used to show the available design space. The proposed method of this paper therefore addresses these initial challenges and provides a framework for approaching the system-of-systems design space creation using ontology. A case study is used to test the method on a fictitious search and rescue scenario based on available resources and information from the Swedish Maritime Administration. The case study shows that a representation of a system-of-systems scenario can be created in an ontology using the method. The ontology provides a representation of the involved entities from the fictitious scenario and their existing relationships. Defined ontology classes containing conditions are used to represent the identified needs for the system-of-systems. The invocation of a description logic reasoner is subsequently used to classify and create an inferred ontology where the available system-of-systems solutions are represented as sub-classes and individuals of the defined classes representing the needs. Finally, several classes representing different possible system-of-systems needs are used to explore the available design space and to identify the most persistent solutions of the case study.

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  • 96.
    Knöös Franzén, Ludvig
    et al.
    Linköping University, Faculty of Science & Engineering. Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems.
    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.
    Amadori, Kristian
    Saab Aeronautics, Linköping, Sweden.
    Jouannet, Christopher
    Saab Aeronautics, Linköping, Sweden.
    Ontology-Represented Design Space Processing2021In: AIAA AVIATION 2021 Forum, August 2-6, 2021, VIRTUAL EVENT, USA: American Institute of Aeronautics and Astronautics, 2021Conference paper (Refereed)
    Abstract [en]

    This paper presents a method for generating a design space intended for aircraft design with the use of ontologies. Aircraft design, seen from a System-of-Systems (SoS) perspective, gives an idea of the complicated relationships and complexities that need to be managed and understood to develop suitable systems for an ever-changing future. Holistic SoS analyzes are used to investigate customer and stakeholder needs that then can be broken down into capabilities and subsequently functions to be performed by involved Constituent Systems (CS), sub-systems and system elements. Ontologies with description logic reasoning capabilities are then used to represent the outcome of the breakdown. An ontology development and integration process can afterwards be used to merge different ontologies together and by that map the derived functions to means that can implement them. This results in an available SoS design space that can be further processed using a description logic reasoner. The outcome of the proposed method is a reduced available design space of functions to be performed and their respective design alternatives. Search and Rescue (SAR) operations based on the Swedish Maritime Administration (SMA) are used as a case study to test the proposed method and to illustrate how it can be utilized. At the end, a design space of alternatives for a new type of search aircraft is generated with ontology and description logic reasoning.

  • 97.
    Knöös Franzén, Ludvig
    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 Arts and Sciences.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Jouannet, Christopher
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Overall Design and Survivability, Saab Aeronautics, Linköping, Sweden.
    Amadori, Kristian
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, Faculty of Science & Engineering. Overall Design and Survivability, Saab Aeronautics, Linköping, Sweden.
    A Breakdown of System of Systems Needs Using Architecture Frameworks, Ontologies and Description Logic Reasoning2021In: Aerospace, E-ISSN 2226-4310, Vol. 8, no 4Article in journal (Refereed)
    Abstract [en]

    Aerospace systems are connected with the operational environment and other systems in general. The focus in aerospace product development is consequently shifting from a singular system perspective to a System-of-Systems (SoS) perspective. This increasing complexity gives rise to new levels of uncertainty that must be understood and managed to produce aerospace solutions for an ever-changing future. This paper presents an approach to using architecture frameworks, and ontologies with description logic reasoning capabilities, to break down SoS needs into required capabilities and functions. The intention of this approach is to provide a consistent way of obtaining the functions to be realized in order to meet the overarching capabilities and needs of an SoS. The breakdown with an architecture framework results in an initial design space representation of functions to be performed. The captured knowledge is then represented in an ontology with description logic reasoning capabilities, which provides a more flexible way to expand and process the initial design space representation obtained from the architecture framework. The proposed approach is ultimately tested in a search and rescue case study, partly based on the operations of the Swedish Maritime Administration. The results show that it is possible to break down SoS needs in a consistent way and that ontology with description logic reasoning can be used to process the captured knowledge to both expand and reduce an available design space representation.

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    fulltext
  • 98.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Aircraft System Optimization and Analysis for Tracebility in Design2006In: AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference,2006, Portsmouth, USA: AIAA/ISSMO , 2006Conference paper (Other academic)
    Abstract [en]

       

  • 99.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    An Information Theoretical Perspective on design2007In: International Conference on Engineering Design,2007, Paris, France: ICED'07 , 2007Conference paper (Refereed)
  • 100.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    An information theoretical perspective on performance refinement and cost2005In: ASME 2005 International Design Engineering Technical Conferences,2005, New York: ASME Press , 2005Conference 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. There are basically two (although related) strains of information theory. The first is the information theory of communication. Another strain is the algorithmic theory of information. In this paper the design process is described as a information transformation process, where an initial set of requirements are transformed to a system specification. Performance and cost are both a functions of complexity and refinement, that can be expressed in information theoretical terms. The information theoretical model is demonstrated on examples. The model has implications for the balance between number of design parameters, and the degree of convergence in design optimization. Furthermore, the relationship between concept refinement and design space expansion can be viewed in information theoretical terms.

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