Control surface freeplay nonlinearity: Modeling and experimental validation

Rui Vasconcellos, Abdessattar Abdelke, Flavio D. Marques, Muhammad R. Hajj

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

1 Scopus citations

Abstract

The variety of response behaviors that may be encountered in aeroelastic systems with discontinuous nonlinearities motivates investigations that may support future applications in controls design, utter prediction, instability characterization and energy harvesting exploration. In this paper, a three degree-of-freedom airfoil with control surface freeplay is modeled using an alternative continuous approximation for the discontinuous nonlin- earity based on hyperbolic tangent representation. The unsteady aerodynamic loads are computed using the modified unsteady Theodorsen approximation for arbitrary motions. Assessment of the validity of the freeplay representation are performed through compari- son with experimental data. Nonlinear time series analysis is used to investigate the type of nonlinear behavior and bifurcations. The results validate the continuous approximation for the freeplay nonlinearity for the considered experimental setup conditions.

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

Publication series

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

Conference

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

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