TY - GEN
T1 - Control surface freeplay nonlinearity
T2 - 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
AU - Vasconcellos, Rui
AU - Abdelke, Abdessattar
AU - Marques, Flavio D.
AU - Hajj, Muhammad R.
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:84881461414
SN - 9781600869372
T3 - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
BT - 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Y2 - 23 April 2012 through 26 April 2012
ER -