Structure design and output displacement modeling of a giant magnetostrictive actuator for a servo valve

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (20) : 83-89.

ZHENG Jiawei，HE Zhongbo，ZHOU Jingtao，XUE Guangming，RONG Ce，BAI Guo

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Abstract

For the problem of poor homogeneity of axial bias magnetic field in traditional giant magnetostrictive actuators, a new one with distributed structure was designed.Then, under the condition of defining the radial and axial dimensions of this actuator, the distributed structure of bias magnetic field was simulated by changing the number of segments of the giant magnetostrictive rod, and the optimal distribution was determined.An output displacement model of the giant magnetostrictive actuator was established through the reluctivity theory, the J-A model, quadratic domain-transfer model and the knowledge of vibration theories.Based on this model, the step response and harmonic response of the actuator were obtained by the lsim function in Matlab.Finally, a test system for the actuator was established, and the step response test and harmonic response test were performed.The results show that the step response time of the actuator can reach 2.37 ms.and in the driving frequency range of 20 Hz to 200 Hz, the test results are basically consistent with the model calculation results, which proves the accuracy of the model.

Key words

giant magnetostrictive actuator / bias magnetic field / structure design / displacement modeling / servo valve

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ZHENG Jiawei，HE Zhongbo，ZHOU Jingtao，XUE Guangming，RONG Ce，BAI Guo. Structure design and output displacement modeling of a giant magnetostrictive actuator for a servo valve[J]. Journal of Vibration and Shock, 2019, 38(20): 83-89

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