Incorporation of Nonlinearities into Actuator Selection for Active Flutter Suppression

AIAA SCITECH 2022 Forum（2022）

Virginia Polytechnic Institute and State University

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Abstract

Actuator selection is a critical field in advanced aircraft design. This is especially true if Active Flutter Suppression (AFS) is desired, as sensitivities at both low and high frequency ranges become relevant. A three degree of freedom airfoil with flap model is analyzed to investigate the impact of actuator nonlinearities such as rate-limit and position saturation on the performance of AFS controllers subject to outer-loop input disturbance. A linear quadratic regulator (LQR) is used to ensure linear stability as well as to investigate nonlinear stability; i.e., response to large excitation. Simulations are performed in order to converge upon the input disturbance level (epsilon) needed to drive the flutter-suppressed system unstable in the presence of the aforementioned nonlinearities. The paper discusses the relationship between epsilon and actuator frequency and proposes varying LQR parameters to produce a more robust nonlinear control solution. Actuator selection based upon nonlinear limits, is shown to play a significant role in the nonlinear stability and AFS performance of the control system.

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