The Research On Application Of Giant Magnetostrictive Materials In Transducer

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.