For Better Performance Please Use Chrome or Firefox Web Browser

A. SEDAGHAT, J. E. COOPER, A. Y. T. LEUNG AND J. R. WRIGHT, Curve fitting approach for transonic flutter prediction, Aeronautical Journal 2003, 107, 565 - 572.

A. SEDAGHAT, J. E. COOPER, A. Y. T. LEUNG AND J. R. WRIGHT, Curve fitting approach for transonic flutter prediction, Aeronautical Journal 2003, 107, 565 - 572.

 

CURVE FITTING APPROACH FOR TRANSONIC FLUTTER PREDICTION

 A. Sedaghat, J.E. Cooper, J. R. Wright and A.Y.T. Leung

Manchester School of Engineering

 Manchester University, Manchester M13 9PL, UK
Abstract

This paper outlines an initial investigation for determining non-linear 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.

Journal Papers
Month/Season: 
September
Year: 
2003
File: