Curve fitting approach for transonic flutter prediction
Author(s)
Author(s)
Sedaghat, A.
Cooper, J. E.
Wright, J. R.
Date Issued
2003
Publisher
Cambridge University Press
Journal
The Aeronautical Journal
Volume
107
Issue
1075
Start page
565
End page
572
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.
SFU Affiliated Publication
No
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