Suppression of Nonlinear Panel Flutter at Elevated Temperature with Piezoelectric Actuators (original) (raw)

34th Structures, Structural Dynamics and Materials Conference, 1993

Abstract

An optimal control design is presented to actively suppress panel flutter large-amplitude limit-cyclic motions at elevated temperature using piezoelectric actuators. The nonlinear dynamic panel flutter equations based on the finite element method are derived for composite panel with piezoelectric laminates subjected to aerodynamic and thermal loads. A model reduction is performed to the finite element equations of motion, in order to conduct the time domain simulation and the control design. An optimal controller is then developed based on the linearized modal equations to provide an optimal combination of inplane forces and bending moments. Numerical simulations based on the reduced nonlinear model show that the critical dynamic pressure can be increased about three times by the piezoelectric actuation and the bending moment is much more effective in flutter suppression as compared to the inplane force. Within the increased critical dynamic pressure, flutter limit-cycle motions can be completely suppressed. For the actuator designs, two-set patched actuators perform better than one-set patched actuators. The results demonstrate that piezoelectric materials are effective in panel flutter suppression.

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