磁致伸缩主被动隔振装置中的磁机耦合效应研究

牛牧青; 杨斌堂; 杨诣坤; 孟光; 陈立群

doi:10.6052/0459-1879-18-254

磁致伸缩主被动隔振装置中的磁机耦合效应研究

* 上海交通大学机械系统与振动国家重点实验室,上海 200240
?? 哈尔滨工业大学深圳校区理学院,深圳 518055

基金项目: 国家自然科学基金资助项目(51775349)

详细信息

作者简介:
2) 陈立群,教授,主要研究方向：非线性动力学与振动控制.E-mail： chenliqun@hit.edu.cn

中图分类号: O328
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出版历程
- 收稿日期: 2018-08-01
- 刊出日期: 2019-03-17

RESEARCH ON THE MAGNETO-MECHANICAL EFFECT IN ACTIVE AND PASSIVE MAGNETOSTRICTIVE VIBRATION ISOLATOR

* State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China
?? School of Science, Harbin Institute of Technology in Shenzhen, Shenzhen 518055, China

摘要

摘要: 磁致伸缩材料和柔顺位移放大机构组成的主动驱动装置具有精度高、驱动力大等特点.将其与被动隔振装置并联,形成主被动隔振装置,可以弥补纯被动隔振在低频和微幅扰动工况下的不足.本文针对这类磁致伸缩主被动隔振装置进行磁机耦合效应研究.基于Jiles-Atherton模型,分析了磁致伸缩材料所受应力对有效磁场、磁化强度、磁致伸缩系数和材料杨氏模量的影响,表征了材料磁机耦合效应.在此基础上,建立了主被动隔振装置的动力学模型,分析了主动驱动装置与被动隔振装置间的耦合作用.在耦合作用影响下,若被动隔振装置刚度不同,即使输入磁场相同,驱动器产生的驱动位移和驱动力也不相同.磁致伸缩材料的变刚度效应使隔振装置整体等效刚度不再为定值,从而影响被动隔振效果.本文提出了通过柔顺机构参数设计减小前述两种耦合影响的方法.数值仿真结果表明,磁致伸缩主被动隔振装置在低于、接近和高于谐振频率三类扰动下,都能达到比被动隔振更好的振动抑制效果.此外,仿真结果验证了考虑磁机耦合效应的数值模型具有更高精度.
- 隔振 /
- 磁致伸缩材料 /
- 磁机耦合 /
- 变刚度效应
Abstract: The actuation system, which is composed of magnetostrictive actuator and compliant displacement amplifier, has the advantages of high precision and large actuation force. It is connected in parallel with passive vibration isolator. The resulting active and passive vibration isolator can make up for the deficiencies of passive isolator on low-frequency and micro-amplitude conditions. In this paper, a nonlinear magnetostrictive actuation model is proposed based on Jiles-Atherton model. Magneto-mechanical effect is comprehensively characterized by being decomposed into stress related effects on effective field, magnetization, magnetostriction and Young's modulus. A dynamic model of the isolator is established considering the coupling effects between active isolator and passive isolator. With the coupling effect, the performance of actuation system is related to passive isolator parameters. With higher passive isolator stiffness, the actuation displacement decreases and the required actuation force increases. The coupling effect also leads to the change of equivalent stiffness of the isolator due to the ?E effect of magnetostrictive material. The influence of coupling effects can be weakened by parameter design of compliant amplifier. The performances of the active and passive vibration isolator are validated by numerical simulation. Three kinds of vibration frequencies are used, which are below, around and beyond natural frequency of the isolator, respectively. Compared to passive vibration isolator, better vibration isolation performances are acquired by adding active vibration isolator on all three conditions. And the calculation results show that the proposed model considering magneto-mechanical effect can reach a higher accuracy.
- vibration isolation /
- magnetostrictive material /
- magneto-mechanical effect /
- ?E effect

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