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Aircraft Vehicle Systems Modeling and Simulation under Uncertainty
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In aircraft development, it is crucial to understand and evaluate behavior, performance, safety and other aspects of the systems before and after they are physically available for testing. Simulation models are used to gain knowledge in order to make decisions at all development stages.

Modeling and simulation (M&S) in aircraft system development, for example of fuel, hydraulic and electrical power systems, is today an important part of the design process. Through M&S a problem in a function or system is found early on in the process.

An increasing part of the end system verification relies on results from simulation models rather than expensive testing in flight tests. Consequently, the need for integrated models of complex systems, and their validation, is increasing. Not only one model is needed, but several interacting models with known accuracies and validity ranges are required. The development of computer performance and modeling and simulation tools has enabled large-scale simulation.

This thesis includes four papers related to these topics. The first paper describes a modeling technique, hosted simulation, how to simulate a complete system with models from different tools, e.g. control software from one tool and the equipment model from another. The second paper describes the use of M&S in the development of an aircraft. The third and fourth papers describe how to increase knowledge of the model’s validity by sensitivity analysis and the uncertainty sources.

In papers one and three an unmanned aerial vehicle is used as an example and in paper four a pressure regulator is the application.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press , 2011. , 52 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1497
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-68068Local ID: LIU-TEK-LIC-2011:36ISBN: 978-91-7393-136-6OAI: oai:DiVA.org:liu-68068DiVA: diva2:415979
Supervisors
Available from: 2011-05-10 Created: 2011-05-10 Last updated: 2011-05-26Bibliographically approved
List of papers
1. Hosted Simulation for Heterogeneous Aircraft System Development
Open this publication in new window or tab >>Hosted Simulation for Heterogeneous Aircraft System Development
2008 (English)Conference paper (Other academic)
Abstract [en]

In aircraft development, it is crucial to understand and evaluate behavior, performance, safety and other aspects of the subsystems before and after they are physically available for test. Simulation models are used to gain knowledge in order to make decisions in all development stages. This paper focuses on a special kind of simulation technique called Hosted Simulation, when a model created in one tool is generated to executable code and imported (hosted) in another tool to perform simulation.

In this paper we report on experience gained from evaluating two different approaches of hosted simulation. Furthermore, the suitability of the two approaches can vary during different phases of aircraft development and utilization, from concept evaluation to end user support. The model of an aircraft subsystem shows that hosted simulation is a powerful and efficient technique.

Keyword
Hosted simulation, model detail levels, model structure, tool, fuel system
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-17937 (URN)
Conference
26th International Congress of the Aeronautical Sciences, ICAS, 14-19 September, Anchorage, Alaska
Available from: 2009-04-27 Created: 2009-04-27 Last updated: 2011-05-10Bibliographically approved
2. Modeling and simulation of Saab Gripen’s vehicle systems
Open this publication in new window or tab >>Modeling and simulation of Saab Gripen’s vehicle systems
2009 (English)Conference paper (Other academic)
Abstract [en]

This paper gives an overview of the modeling and simulation work for the military aircraft JAS 39 Gripen´s vehicle systems. The vehicle systems comprise fuel, ECS, hydraulic, and auxiliary power systems and also landing gear. Vehicle systems have several modeling  challenges such as both compressible air and less compressible fluids that give stiff differential equations, gforce effects, nonlinear cavitation and saturation. It is also a complex system of integrated systems that requires models with integrated system software. Dynamic models based on physical differential equations have generally been used. The physical systems were previously modeled in Easy5 and the software in MATRIXx. Changes in tools where the physical systems are modeled in Dymola and the control algorithms are modeled in Simulink have opened up for new possibilities for more advanced and more complete system simulations. Simulations have been performed during the whole development cycle of the aircraft from concept evaluation to qualification tests. The paper gives some examples from the simulations where system performance and the internal states of the system are calculated.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-52165 (URN)
Conference
AIAA Modeling and Simulation Technologies Conference, Chicago, Illinois, Augidy 10-13
Available from: 2009-12-08 Created: 2009-12-08 Last updated: 2011-05-10Bibliographically approved
3. Balancing Uncertainties in Aircraft System Simulation Models
Open this publication in new window or tab >>Balancing Uncertainties in Aircraft System Simulation Models
2009 (English)Conference paper (Other academic)
Abstract [en]

In aircraft development, it is crucial to understand and evaluate behaviour, performance, safety and other aspects of the subsystems before and after they are physically available for testing. Simulation models are used to gain knowledge in order to make decisions at all development stages.

This paper focuses on how to balance different kinds of uncertainties in aircraft subsystem simulation models. It is important that the methods of assessing uncertainties are implementable in the modelling and simulation process to achieve efficient system development. In this paper we report on experience gained from a local sensitivity analysis conducted on a realistic industrial example in the form of a simulation model of the fuel system in an unmanned aerial vehicle (UAV).

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-52163 (URN)
Conference
CEAS 2009 European Air and Space Conference, 26-29 October, Manchester, UK
Available from: 2009-12-08 Created: 2009-12-08 Last updated: 2011-05-10Bibliographically approved
4. Modeling and Simulation of Saab Gripens Vehicle Systems, Challenges in Processes and Data Uncertainties
Open this publication in new window or tab >>Modeling and Simulation of Saab Gripens Vehicle Systems, Challenges in Processes and Data Uncertainties
Show others...
2010 (English)Conference paper (Other academic)
Abstract [en]

In aircraft development, it is crucial to understand and evaluate behaviour, performance, safety and other aspects of subsystems before and after they are physically available for testing. Simulation models are used to gain knowledge in order to make decisions at all development stages.

This paper describes the development of Saab Gripen´s vehicle systems and some methods and challenges related to uncertainties in test and model data. The ability to handle uncertain information and lack of information is the key to success in early design. The vehicle systems comprise fuel, environment control system (ECS), hydraulic, auxiliary power, escape, electrical power and landing gear system.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-60731 (URN)
Conference
27th Congress of the International Councilof the Aeronautical Sciences, ICAS2010, September 19-24, Nice, France
Available from: 2010-10-25 Created: 2010-10-25 Last updated: 2011-05-10Bibliographically approved

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