Abstract：High-power giant magnetostrictive electroacoustic transducers usually adopt a structure composed of multiple giant magnetostrictive rods to radiate higher acoustic power. The current impedance analysis methods generally treat giant magnetostrictive bars as uniform individuals for calculation. However, the directional solidification method used in the preparation of the material has inherent defects, resulting in the uneven properties. Therefore, the traditional impedance analysis method is inaccurate. In this paper, the finite element simulation is used to demonstrate the impedance effect caused by parametric differences in four bars. Using the distributed parameter method, the difference of parameters in different positions is further considered. Then, the bars are differentiated by unit length, and the integral sum is carried out with the micro-elements occupied by the same parameters, and then the overall impedance of the transducer is analyzed. By comparing with the traditional lumped parameter model and experimental data, the impedance analysis method proposed in this paper is more accurate and has great significance for guiding the design of the transducer.
赵能桐, 杨鑫, 陈钰凯, 罗安. 考虑超磁致伸缩材料非均匀性的大功率电声换能器阻抗特性[J]. 电工技术学报, 2021, 36(10): 1999-2006.
Zhao Nengtong, Yang Xin, Chen Yukai, Luo An. The Impedance Characteristics of High Power Electroacoustic Transducer Considering the Inhomogeneity of Giant Magnetostrictive Material. Transactions of China Electrotechnical Society, 2021, 36(10): 1999-2006.
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