Effects of parameter uncertainties on the response of an aeroelastic system

Mehdi Ghommem, Muhammad R. Hajj, Ali H. Nayfeh

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

Two approaches are used to determine the effects of variations in the linear plunge and pitch stiffness coefficients of an aeroelastic system on its stability near the bifurcation. The first approach is based on implementation of intrusive PCE on the governing equations. The results show that PCE can be used to determine sensitivity of the flutter speed to variations in the linear stiffness coefficients. The second approach is based on using the normal form, derived with the method of multiple scales, to characterize the dynamic instability that occurs as the freestream velocity is increased. The results show that the normal form yields a physical characterization of the effects of variations in the linear stiffness coefficients on the flutter speed. Furthermore, the normal form yields detailed aspects of the effects of variations of the linear parameters on the amplitude of the ensuing LCO.

Original languageEnglish
Title of host publication51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
DOIs
StatePublished - 2010

Publication series

NameCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
ISSN (Print)0273-4508

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