【作者】 薛淼；

【导师】 汪建新；

【作者基本信息】 内蒙古科技大学 ， 机械设计及理论， 2007， 硕士

【摘要】 稀土超磁致伸缩材料(GMM)是近年来发展起来的一种新型功能材料,具有磁致伸缩应变大、磁机耦合系数高、响应速度快、能量密度高等优异特性,已在机电领域显示出良好的应用前景。本论文以这种新型的功能材料为基础,以基于该类材料的换能器为研究对象,在超磁致伸缩材料Terfenol-D的工作特性,超磁致伸缩换能器的设计与数值分析等方面进行了较为深入与系统的研究,从而为超磁致伸缩换能器的深入研究提供了依据,同时也为超磁致伸缩器件的设计提供了理论依据。本文在以下几方面开展了研究工作:从磁致伸缩现象及其应用机理入手,较为系统地对超磁致伸缩材料的“跳跃”效应、?E效应、温度效应、倍频效应、涡流效应等特性进行了分析与阐述,为高效、合理地应用超磁致伸缩材料奠定了理论基础。简述了超磁致伸缩材料的国内外研究现状与发展历史。综述了超磁致伸缩换能器的应用研究现状、发展趋势及目前存在的主要问题。根据稀土超磁致伸缩材料的工作特性,结合超磁致伸缩换能器设计的几个关键问题,给出了设计的超磁致伸缩换能器的结构简图,介绍了其工作原理,并提出了超磁致伸缩换能器结构设计的方法,其中包括线圈骨架的设计、激励线圈的设计、偏置磁场的设计、磁路设计、预压力的设计及辐射板的设计。简要介绍了有限元法及其软件,以及与本课题相关的有限元理论。使用ANSYS软件对设计的超磁致伸缩换能器采用压电-压磁比拟法进行了有限元分析,并得出了超磁致伸缩换能器工作时,Terfenol-D棒在磁-机耦合场作用下,超磁致伸缩棒内部的径向应力、应变分布规律,这对换能器的整体性能研究都具有重要参考意义。分析还表明:Terfenol-D棒的纵向位移与轴向磁场的频率相同,说明通过施加偏置磁场确实消除了倍频效应的影响。此外,还采用温度应力-磁致伸缩应力类比法对超磁致伸缩换能器进行了有限元分析,所得Terfenol-D棒的上端的中心节点的纵向位移值与实验测试值比较接近,从而表明该方法是可行的,开辟了ANSYS软件求解磁致伸缩问题的新思路。最后概括了全文的主要研究成果,并展望了今后需进一步开展的工作。更多还原

【Abstract】 Rare Earth Giant Magnetostrictive Materials(GMM) is a new kind of functional material developed in recent years,which has several inherent excellent properties, such as large magnetostrictive strain, high coupling coefficient,rapid response, and high energy density and so on, which makes it demonstrate good application prospect in the mechanical and electrical domain. Based on the new type of functional material, taking the transducer based on it as the research object, this paper carries on thorough and systematic researches on the operational factor of Giant Magnetostrictive Material Terfenol-D, the design and numerical analysis of gaint magnetostrictive tranducer. It provides basis for the further research of giant magnetostrictive transducer.Several research work has done in the paper as follows:Starting with magnetostriction and its mechanism,the characteristics of giant magnetostrictive materials, such as“jump”effect, ? E effect, temperature effect, double frequency property, eddy current influence and so on, are a little more systematically analyzed and elaborated. The theory foundation is settled for highly effectively and rationally using giant magnetostrictive materials. Current research situations in domestic and foreign and development history are introduced briefly.The applied research present situation, the development tendency and the main question which exists at present are summarized.According to the operational factor of rare earth gaint magnetostrictive materials, uniting several key questions about the design of gaint magnetostrictive transducer, diagram of mechanism of it is given, its principle of work is introduced, structural design method is proposed ,including coil skeleton design, field coil design, bias magnetic field design, magnetic circuit design, prepressure design and radiation board design.Finite Element Method and its software, as well as finite element theory with this topic correlation are briefly introduced. ANSYS software is used to carry on the finite element analysis for gaint magnetostriction transducer on piezoelectricity-to-press magnetism method. And when gaint magnetostrictive transducer works, interior radial stress, strain distributed rule of gaint magnetostrictive material Terfenol-D rod is obtained under the magneto-mechanical coupling field. It is of important reference significance to the transducer’s overall performance research. The analysis also indicats that, the frequency of both longitudinal displacement and axial magnetic field in the Terfenol-D rod is same, which shows truly eliminating the influence of double frequency effect through exerting the bias magnetic field. In addition, temperature stress-magnetostriction stress analogy method is used to carry on finite element analysis to the ultra magnetostriction transducer, the obtained Terfenol-D rod upper central node’s longitudinal displacement value and the experimental tested value to be quite close, which indicates this method is feasible. It pioneers ANSYS software new train of thoughts to solve the magnetostriction question.At last, summarizes research results and puts forward the future research work.更多还原