伺服阀用超磁致伸缩致动器弓张结构设计与研究

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摘要为满足电液伺服阀的驱动要求，解决超磁致伸缩制动器（GMA）体积大小与输出位移大小相互制约问题，提出了一种弓张结构用于GMA输出位移的放大；利用理论力学、材料力学理论，拉格朗日动力学方程及有限元仿真方法对弓张结构的动力学特性、位移放大倍数及其主要结构尺寸参数对位移放大倍数影响进行了分析；在上述基础上制作了弓张放大式GMA样机，搭建了实验测试系统，进行了正弦激励和扫频特性实验，完成了模型的验证。实验结果表明：正弦激励下，弓张结构的放大倍数在10.3~11.1之间波动，与理论计算值相吻合；扫频试验下，弓张放大式GMA最大波峰约在108Hz处，与理论计算相符，其频带宽度可达到100Hz，能够满足伺服阀输出特性要求。

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	郑佳伟1
	何忠波1
	李冬伟1
	荣策1
	杨朝舒2
	薛光明1

关键词 ：超磁致伸缩材料, 弓张结构, 致动器, 有限元仿真, 伺服阀

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

收稿日期: 2017-07-25 出版日期: 2018-12-15

引用本文:

郑佳伟1，何忠波1，李冬伟1，荣策1，杨朝舒2，薛光明1. 伺服阀用超磁致伸缩致动器弓张结构设计与研究[J]. 振动与冲击, 2018, 37(24): 30-37.
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. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(24): 30-37.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I24/30

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