A design and study on the bow-type structure of a giant magnetostrictive actuator for servo valves

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (24) : 30-37.

ZHENG Jiawei1，HE Zhongbo1，LI Dongwei1，RONG Ce1，YANG Zhaoshu2，XUE Guangming1

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Abstract

To meet the driving requirements of electro-hydraulic servo valves and solve the restriction between the size and the output displacement of the GMA, a bow-type structure was designed to amplify its output displacement.Through theoretical mechanics, material mechanics theory, the Lagrange’s dynamical equation and the finite element simulation method, the dynamic characteristics, displacement magnification of bow-type structure and the influence of its main structure size parameters on the displacement magnification were analyzed.The GMA with bow-type structure prototype was manufactured, the experimental system was established and the proposed model was verified by sweep and sinusoidal experiments.The results show that under sinusoidal excitation, the magnification of the bow-type structure fluctuated between 10.3 and 11.1, which was in agreement with the theoretical calculation.Under the sweep test, the maximum peak of GMA with bow-type structure was about 108 Hz, which was consistent with the theoretical calculation, and its bandwidth could reach 100 Hz, which could satisfy the servo valve output characteristic requirement.

Key words

giant magnetostrictive material / bow-type structure / actuator / finite element simulation / servo valve

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ZHENG Jiawei1，HE Zhongbo1，LI Dongwei1，RONG Ce1，YANG Zhaoshu2，XUE Guangming1. A design and study on the bow-type structure of a giant magnetostrictive actuator for servo valves[J]. Journal of Vibration and Shock, 2018, 37(24): 30-37

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