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Abstract

A kind of giant magnetostrictive-piezoelectric composite actuator is proposed in this paper, and its magneto-mechanical-electric coupled dynamic characteristics and control are studied. New differential terms are introduced to describe the hysteretic phenomena of giant magnetostrictive materials. The coupled dynamic model of the giant magnetostrictive-piezoelectric composite actuator is developed, and its nonlinear dynamic response is obtained. Finally, the optimal control is proposed to improve the drive accuracy, and its effects are proved by experiments. The results of numerical simulation and experiments show that stochastic disturbance plays an important influence on the system’s dynamic response; stochastic optimal control can improve the actuator’s accuracy in strong stochastic disturbance. The results of this study are helpful for the optimal design and improvement of giant magnetostrictive-piezoelectric composite actuators.

Keywords

Giant magnetostrictive material piezoelectric ceramics actuator stochastic optimal control

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Nonlinear dynamic characteristics and control of giant magnetostrictive-piezoelectric composite actuator

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