稀土超磁致伸缩换能器等效热网络建模研究  

Research on Equivalent Thermal Network Modeling for Rare-Earth Giant Magnetostrictive Transducer

作　　者：张智贺 杨鑫[1] 陈钰凯 Zhang Zhihe;Yang Xin;Chen Yukai(National Electric Power Conversion and Control Engineering Technology Research CenterHunan University,Changsha 410082 China)

机构地区：[1]湖南大学国家电能变换与控制工程技术研究中心,长沙410082

出　　处：《电工技术学报》2022年第14期3464-3474,3565,共12页Transactions of China Electrotechnical Society

摘　　要：超磁致伸缩换能器的工作特性与温度密切相关,快速准确地对换能器温度分布进行分析计算与预测是换能器设计与性能评估的关键。凭借仿真速度快、准确性高等显著优势,热网络建模广泛用于换能器热分析,但多聚焦于稳态建模研究,忽略超磁致伸缩棒由于热导率低所导致的明显的瞬态温度梯度。为此,该文以纵振式超磁致伸缩换能器为研究对象,计及超磁致伸缩棒作为热源的特殊性和对棒材温度空间分布的影响,建立超磁致伸缩换能器瞬态等效热网络模型。首先基于换能器的结构和工作原理,对其进行热分析;然后重点对超磁致伸缩棒进行建模,根据换能器内部传热过程,建立换能器瞬态热网络模型并对模型参数进行计算;最后搭建有限元仿真模型和换能器温升实验平台,从仿真和实验两方面验证了所提热网络模型对换能器温度时空分析的准确性和有效性。The working characteristics of giant magnetostrictive transducers(GMT)are closely related to temperature.Fast and accurate calculation and prediction of transducer temperature distribution is the key to transducer design.With the advantages of low calculation cost and high accuracy,thermal network modeling has been developed for GMT thermal analysis.However,most studies focus on steady-state modeling,ignoring the obvious temperature gradient of giant magnetostrictive rod caused by the poor thermal conductivity in the thermal transient.Therefore,this paper established a transient equivalent thermal network model of the GMT,considering the distinctiveness of the giant magnetostrictive rod as a heat source and the influence of the spatial distribution of the rod temperature.Firstly,based on the structure and working principle of the transducer,the thermal analysis was carried out.Then,the giant magnetostrictive rod was modeled.According to the internal heat transfer process of the GMT,a complete transient thermal network model was established and the model parameters were calculated.Finally,the finite element simulation model and the experimental platform of a GMT were built,and the effectiveness and accuracy of the proposed model were verified.

关 键 词：超磁致伸缩换能器 等效热网络瞬态模型 参数计算 有限元模型 温度分布 

分 类 号：TN712.2[电子电信—电路与系统]