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Aeroservoelastic simulation by time-marching

Published online by Cambridge University Press:  04 July 2016

L. Djayapertapa  and
C. B. Allen
L. Djayapertapa
Affiliation:
Department of Aerospace Engineering, University of Bristol, UK
C. B. Allen
Affiliation:
Department of Aerospace Engineering, University of Bristol, UK
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Abstract

The coupling of independent structural dynamic and inviscid aerodynamic models, in the time domain, is considered. The accuracy and CPU requirements of the two common approaches, namely ‘weak’ and ‘strong’ coupling procedures, are investigated. It is found that the strong coupling scheme is more accurate than the weak coupling approach, and only for large real time-steps is the strong coupling scheme more expensive. The computational method developed is used to perform transonic aeroelastic and aeroservoelastic calculations in the time domain, and used to compute stability (flutter) boundaries of 2D wing sections. A control law is implemented within the aeroelastic solver to investigate active means of flutter suppression via control surface motion. Comparisons of open and closed loop calculations show that the control law can successfully suppress the flutter and results in a significant increase in the allowable speed index in the transonic regime. The effect of structural nonlinearity, in the form of hinge axis backlash is also investigated. The effect is found to be destabilising, but the control law is shown to still alleviate the destabilising effect.

Type
Research Article
Information
The Aeronautical Journal , Volume 105 , Issue 1054 , December 2001 , pp. 667 - 678
Copyright
Copyright © Royal Aeronautical Society 2001 

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