摘要
目前,国内外对稀土超磁致伸缩棒材(简称棒材)参数的测量和提取方法不尽相同,且大都没有考虑测试过程中由于棒材伸长导致的预应力变化问题,测量结果无法直接对比,误差无法确定,准确性无从考量。因此,换能器仿真设计没有可靠的特性数据做支撑。该文设计搭建一套稀土超磁致伸缩棒材特性测试平台,考虑由于棒材伸长导致预应力变化的因素,可对棒材静态及准静态性能进行测试,包括棒材的磁致伸缩性能、B-H曲线、杨氏模量等。重点对平台的保压装置进行设计优化,设置对比实验,实验结果表明,在测试过程中采用该文设计的保压装置,预应力变化率可由无保压装置的10.625%降至1.134%以下,且实验证明棒材性能测试更准确。最后对平台测试的B-H曲线、应力-应变曲线(σ-λ曲线)结果进行处理,得到磁导率和杨氏模量两个重要参数,并分析其随磁场强度和预应力的变化趋势。该平台的设计及优化为超磁致伸缩棒材参数的提取提供了一种更为可靠的测定方法。
At present,parametric measurement and extraction methods for rare-earth giant magnetostrictive rods(aka"rods")differ widely at home and abroad,and most of them have not considered the prestress change caused by rod elongation during the testing process.This leads to incomparability and inaccuracy of these measurement results.As a result,the simulation design of magnetostrictive transducer is not supported by reliable characteristic parametric data.This paper provides a test platform for rare-earth giant magnetostrictive rods considering the prestress change caused by rod elongation.This platform can be used to test the static and quasi-static characteristics of the rods including magnetostrictive performance,B-H curve,Young's modulus,etc.The pressureholding device was integrated and optimized to improve the test accuracy.The comparative experiments show that with the proposed pressure-holding device,the rate of prestress change of rods can be reduced from 10.625% to below 1.134%,and the performance is more accurate.In addition,the platform was used to test the B-H curve and curve of the rods.Two important parameters,permeability and Young's modulus,are obtained,and their variations with magnetic field and prestress are analyzed.The platform proposed in this paper provides a reliable measurement method for the parameter extraction of giant magnetostrictive rods.
作者
杜杲娴
杨鑫
韦艳飞
宁倩
罗安
Du Gaoxian;Yang Xin;Wei Yanfei;Ning Qian;Luo An(National Engineering Research Center for Power Conversion and Control,Hunan University,Changsha,410082,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2021年第18期3867-3875,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点项目(51837005)
大功率电声高效换能机理与控制方法研究资助。
关键词
稀土超磁致伸缩材料
预应力
磁致伸缩性能
磁导率
杨氏模量
Rare-earth giant magnetostrictive materials
prestress
magnetostrictive performance
permeability
Young’s modulus
作者简介
杜杲娴,女,1996年生,硕士研究生,研究方向为电声变换技术与装备。E-mail:544708992@qq.com;通信作者:杨鑫,男,1987年生,博士,教授,博士生导师,研究方向为电力电子技术、电力电子器件应用、电声换能系统。E-mail:xyang@hnu.edu.cn。
