Resonant Frequency Calculation And Structural Design Of Giant Magnetostrictive Transducer

Rare-earth giant magnetostrictive materials have a lot of advangtages, such as large magnetostrictivestrain，fast response time and high reliability etc. With the mentioned characterastics, the rare-earth materialshave been widely used in various scientific fields, like water-acoustic sonar, electrical-acoustic sensorstechnology, marine exploration and development,micro-displacement driven, the vibration reduction andantivibration, and robots etc.In this paper, After discussing the following three main parts: resonant frequencycalculation, structural design and optimization of the giant magnetostrictive transducer, the analysis of thesimulation of magnetic–mechanical, the correctness of both the theory and the simulatin of finite elements areverified, then the transducer was studied further.First, this paper introduced magnetostrictive phonomena and mechnism,summarised the maincharacterestics, the history of development and the current situation of relevant study, and then itrecommended the overview and existed problems of the study with regard to giant magnetostrictive transducerin our country and abroad. Based on the contents given, I stated the paper’s meaning and research contents.Secondly, the operating principles and design procedures of transducer are elaborated. According to theworking features of Terfenol-D rod, the resonant frequency of giant magnetostrictive transducer was caculatedby equivalent circuit method and power method, and impedance matching and series-parallel tuning of thecircuit were proceeded in experiments. Combined with the indicators required, the structure of giantmagnetostrictive transducer was given initial design, icluding Terfenol-D rod design, incentive coil design,bias magnetic coil design,disc spring and prestressed design, front and back plates and output rod design, andyoke design.Then, the magnetic circuit section and structure section of giant magnetostrictive transducer have beenanalyzed by using finite element analysis software respectively, resonant frequency of the Terfenol-D rod andtransducer has been verified theoretically, the figure of vibration pattern was simulated.Also, the incentive coil,the structure of permanent magnetism, output rod and front and back plates of the transducer have beenoptimized, at last the optimizing transducer structure has been determined.Finally, the prototype of transducer was made, and the experiment test system has been established. Theexperimental proof to coil impedance and experiment on both static characteristic and dynamic charicteristicwere carried out on transducer. With the experimental data, the feasibility of transducer’s optimization hasbeen proved. The conclusions of this paper have been summerized, and the outlook on future work was madetoo.