伺服阀用超磁致伸缩致动器结构设计及输出位移建模

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摘要针对传统永磁偏置式超磁致伸缩致动器轴向偏置磁场均匀性较差的问题，设计了一种具有分布式永磁体偏置结构的阀用超磁致伸缩致动器；采用控制变量的方法，在限定超磁致伸缩致动器结构尺寸的条件下，通过改变超磁致伸缩棒的段数，对致动器偏置磁场进行仿真分析，并确定了最佳分布结构；基于磁阻理论、J-A模型、二次畴转模型及振动理论知识建立了阀用超磁致伸缩致动器的输出位移模型，并通过Matlab中lsim函数对致动器的阶跃响应及谐波响应进行了数值求解；为验证结构设计的合理性和模型的准确性，搭建了该致动器的试验系统，并进行了阶跃响应及谐波响应试验；结果表明：所设计的阀用超磁致伸缩致动器阶跃响应时间可达2.37 ms，在20 Hz到200 Hz的驱动频率范围内，试验结果与模型计算结果基本吻合，证明了模型的准确性。

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	郑佳伟
	何忠波
	周景涛
	薛光明
	荣策
	柏果

关键词 ：超磁致伸缩致动器, 偏置磁场, 结构设计, 位移建模, 伺服阀

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

收稿日期: 2018-06-28 出版日期: 2019-10-15

引用本文:

郑佳伟，何忠波，周景涛，薛光明，荣策，柏果. 伺服阀用超磁致伸缩致动器结构设计及输出位移建模[J]. 振动与冲击, 2019, 38(20): 83-89.
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. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(20): 83-89.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I20/83

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