压电声衬结构设计及其优化

Design and Optimization of the Piezoelectric Acoustic Liner Structure

可调频声衬是学术界的研究热点,该文提出了一种基于逆压电效应的可调频声衬结构。该结构将压电片作为声衬的背板,通过压电片的形变来改变声衬的腔体体积,从而调节声衬的消声频率。在分析声衬消声原理及逆压电效应的基础上,采用有限元法对压电片的位移进行分析,压电片的形变量与施加的直流电压幅值呈线性关系。最后通过对压电声衬进行结构优化设计,增加了体积的相对变化量,直径为50mm压电片的形变量为0.2mm时,产生的体积相对变化量从0.85%提升到3.3%,其消声频带的偏移量增加至30Hz。

The tunable acoustic liner is a research focus in the academia.This paper puts forward a kind of tunable acoustic liner which based on inverse piezoelectric.The piezoelectric plate is used as the backplane of the acoustic liner,the cavity volume of the liner is changed by the deformation of the piezoelectric plate,thus the frequency of the acoustic muffler liner can be adjusted.On the basis of analyzing the principle of the acoustic liner muffler and the inverse piezoelectric effect,the displacement of the piezoelectric sheet has been analyzed by using the finite element method.It is found that the deformation of the piezoelectric plate presents a linear relationship with the amplitude of the applied DC voltage.Finally,the design of the piezoelectric acoustic liner structure is optimized and the relative amount of change in volume is increased.The relative amount of change in volume is creased from 0.85% to 3.3%and the band offset of the acoustic liner can reach to 30 Hz when the deformation of piezoelectric plate with diameter of ？50mm is 0.2mm.