Aeroelastic analysis and characterization of three-degree-of-freedom systems with discontinuous nonlinearity

R. Vasconcellos, A. Bouma, F. Marques, A. Abdelkefi, M. R. Hajj

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

Abstract

The effects of freeplay, multi-segmented, and impact nonlinearities in the pitch and control surface degree of freedoms on the behavior of a three-degree of freedom aeroelastic system are investigated. The aeroelastic system consists of a plunging and pitching rigid airfoil supported by a linear spring in the plunge degree of freedom, a nonlinear torsional spring in the pitch degree of freedom and a control surface with a nonlinear spring in the trailing edge. The unsteady representation based on the Duhamel formulation is used to model the aerodynamic loads. Using modern methods of nonlinear dynamics, a nonlinear characterization is performed to identify the system’s response. Observations of this study show that grazing/sliding behavior are present as well as nonlinear coupling between the frequencies of the system, leading to a complex behavior, sudden transitions between harmonic and chaotic responses as freestream velocity is increased. These discontinuous characteristics can lead to the occurrence of sudden amplitude variations and broadband oscillatory behavior that can result in catastrophic structural failures in aeroelastic systems.

Original languageEnglish
Title of host publicationAIAA AVIATION 2020 FORUM
Pages1-8
Number of pages8
DOIs
StatePublished - 2020
EventAIAA AVIATION 2020 FORUM - Virtual, Online
Duration: 15 Jun 202019 Jun 2020

Publication series

NameAIAA AVIATION 2020 FORUM

Conference

ConferenceAIAA AVIATION 2020 FORUM
CityVirtual, Online
Period15/06/2019/06/20

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