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Curve fitting approach for transonic flutter prediction

Published online by Cambridge University Press:  04 July 2016

A. Sedaghat,
J. E. Cooper,
J. R. Wright and
A. Y. T. Leung
A. Sedaghat
Affiliation:
School of Mechanical Engineering, University of Leeds, UK
J. E. Cooper
Affiliation:
Manchester School of Engineering, University of Manchester, UK
J. R. Wright
Affiliation:
Manchester School of Engineering, University of Manchester, UK
A. Y. T. Leung
Affiliation:
Manchester School of Engineering, University of Manchester, UK
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Abstract

This paper outlines an initial investigation for determining nonlinear aerodynamics for unsteady transonic flows through the use of curve fitting unsteady computational fluid dynamics (CFD) data. The full aerodynamics including linear and non-linear aerodynamics can be identified as a polynomial function. Through the curve fitting method, the important non-linear terms can be identified and the smaller terms can be neglected. Having modelled the non-linear aerodynamics and included into the aeroelastic model, the characteristics and stability of non-linear aeroelastic system can then be investigated using normal form theory. The methodology is demonstrated upon a simple two-degrees-of-freedom aeroelastic wing model with structural and aerodynamics nonlinearity. A good agreement is obtained for all cases studied between analytical and simulation results.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 107 , Issue 1075 , September 2003, pp. 565 - 572
Copyright
Copyright © Royal Aeronautical Society 2003 

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