磁致伸缩换能器谐振腔内介质密度声场分析

Acoustic Field Analysis of Dielectric Density in the Resonant Cavity of Magnetostrictive Transducer

基于热声效应的磁致伸缩换能器热声制冷机,其内部的声场分析对于制冷效率的提高有十分重要的作用。选取了基础声压0.2~1.0 MPa之间,每0.2 MPa作为间隔,激励频率为1000~8000 Hz下,保持激励电流不变。用有限元仿真软件ATILA对其进行仿真分析,获得了各个基础压力下较为稳定的平面驻波,为热声制冷机谐振腔的声场分析提供了对比数据,提高了制冷能力;发现在谐振腔内加载基础压力会影响辐射板在激励下的响应特性,导致谐振腔声压大小发生变化。随着加载基础声压的增大,谐振腔内产生的声压值也随着增大。需要根据分析结果选择最优的加载压力与驱动频率的组合。

The acoustic field analysis of magnetostrictive transducer thermoacoustic refrigerator based on thermoacoustic effect plays an important role in improving the refrigeration efficiency.When the base sound pressure was 0.2~1.0 MPa,every 0.2 MPa was chosen as the interval,and the excitation frequency was 1000~8000 Hz,the excitation current remained unchanged.The finite element simulation software ATILA was used to simulate and analyze it,and the relatively stable plane standing wave under each base pressure was obtained,which provided the comparative data for the acoustic field analysis of the resonant cavity of the thermoacoustic refrigerator and improved the refrigeration capacity.It is found that the loading of base pressure in the resonant cavity will affect the response characteristics of the radiation plate under excitation,resulting in the change of acoustic pressure in the resonant cavity.With the increase of the basic sound pressure,the sound pressure produced in the resonant cavity also increases.The optimal combination of loading pressure and driving frequency should be selected according to the analysis results.