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

Article type: Research Article

Authors: Zhu, Zhiwen^a | Liu, Fang^a | Sheng, Hui^a | Xu, Jia^{a; b;}

Affiliations: [a] Department of Mechanics, Tianjin University, Tianjin, China | [b] Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin University, Tianjin, China

Correspondence: [*] Corresponding author: Jia Xu, Department of Mechanics, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China. E-mail: xujia@tju.edu.cn

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

DOI: 10.3233/JAE-171191

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 291-298, 2019