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Unsteady aerodynamic modelling: a simple state-space approach
Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
2005 (English)In: Proc. of 43rd AIAA Annual Meeting and Exhibits, Reno, Nevada: AIAAA , 2005Conference paper, Published 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.

Place, publisher, year, edition, pages
Reno, Nevada: AIAAA , 2005.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-31408DOI: 10.2514/6.2005-855Local ID: 17179OAI: oai:DiVA.org:liu-31408DiVA: diva2:252231
Conference
43rd AIAA Annual Meeting and Exhibits, Reno, Nevada, USA, 2005
Note

Proceedings on CD

Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2012-12-12
In thesis
1. Model based aircraft design: high angle of attack aerodynamics and weight estimation methods
Open this publication in new window or tab >>Model based aircraft design: high angle of attack aerodynamics and weight estimation methods
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis addresses modelling of high angle of attack aerodynamic characteristics and weight estimation for highly maneuverable aircraft during conceptual design. In order to allow configuration selection with sufficient confidence, especially with unconventional configurations, high angle of attack aerodynamic prediction and weight estimations methods need to be improved. In this thesis, a state-space variable approach is proposed for modelling high angle of attack aerodynamics including large angular rates. A new weight estimation based on a parametrical CAD model is also proposed.

The aerodynamic model is intended for use in both conceptual design and in later design phases. In conceptual design, the parameters are defined from geometrical data. Good results have been obtained with slender delta wings and on in various full configurations. When test data or CFD data arc available, the parameters are obtained from identification. Various results are presented with high accuracy iu the model. The developed model has been implemented in flight simulation, and in a sizing example, where two different aerodynamic models were used in order to show the influences of large angular rates on the geometrical layout. The presented weight estimation method is based on parametrical CAD models, and the weight is extracted from the structure layout. This allows any type of a ircraft configuration to be investigated, without the use of empirical or statistical approaches. Comparison with known aircraft has shown good agreement.

This thesis introduces a new aerodynamic model that includes large angular rates at any angle of attack, and a new weight prediction method. Both have shown good agreement with compared data and indicate that the models are suitable for conceptual design and that further studies should be conducted in order to extend the possibilities demonstrated here.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2005. 140 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 968
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-31437 (URN)17220 (Local ID)91-85457-18-3 (ISBN)17220 (Archive number)17220 (OAI)
Public defence
2005-12-02, Nobel salen, Hus B, Linköpings Universitet, Linköping, 10:15 (Swedish)
Opponent
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2012-12-12

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Jouannet, ChristopherKrus, Petter

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