Nonlinear analysis and identification of limit cycle oscillations in an aeroelastic system

Abdessattar Abdelkefi, Rui Vasconcellos, Ali H. Nayfeh, Muhammad R. Hajj, Omar Badran

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

4 Scopus citations

Abstract

The identification of a concentrated nonlinearity in the torsional spring of an aeroelastic system is performed. The system consists of a rigid airfoil that is supported by a linear spring in the plunge motion and a nonlinear spring in the pitch motion. Quadratic and cubic nonlinearities in the pitch moment are introduced to model the concentrated non- linearity. The aerodynamic loads are modeled using two different representations, namely, the quasi-steady approximation and the Duhamel formulation. Unlike the quasi-steady approximation which fails to correctly predict the flutter speed, the Duhamel formulation yielded accurate prediction for the flutter speed and frequency. The results show that the use of the Duhamel formulation to represent the aerodynamic loads yields excellent agreement between the experimental data and the numerical predictions.

Original languageEnglish
Title of host publication53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012
DOIs
StatePublished - 2012
Event53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012 - Honolulu, HI, United States
Duration: 23 Apr 201226 Apr 2012

Publication series

Name53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012

Conference

Conference53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012
Country/TerritoryUnited States
CityHonolulu, HI
Period23/04/1226/04/12

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