变截面背腔结构的微穿孔板吸声器的设计与研究

如何实现微穿孔板吸声结构的宽频吸声是近年来的研究热点之一。针对微穿孔板吸声结构的宽频吸声问题，本文设计了一种不规则背腔结构，并将其应用到单层和双层微穿孔板的吸声器上，对其吸声性能进行了研究。利用声电类比模型获得吸声器各部分的阻抗关系，然后通过理论计算得到吸声结构的阻抗和吸声系数。理论、仿真和实验结果表明：在不增加结构厚度的情况下，通过内层变截面隔板对背腔进行不等体积分割，可拓宽微穿孔板吸声带宽，且结构相对简单。该研究为微穿孔板吸声器的宽带低频吸声及其应用提供了新的设计思路。

Design and study of variable cross-section back cavity typed micro-perforated panel absorber

How to achieve the broadband sound absorption of the micro-perforated panel (MPP) sound absorber is one of the research hotspots in designing low-frequency absorber. To solve this problem, a design of irregular back cavity structure is proposed and applied to the single-layer and double-layer micro-perforated panel absorber, and their sound absorption performances are studied in this paper. The impedance relationship of each part of the microperforated panel absorber is obtained by the equivalent circuit model (ECM), and their impedance and sound absorption coefficient are calculated by theory. The theoretical, simulated and experimental results show that without increasing the thickness of the structure, the sound absorption bandwidth of MPP can be broadened by unequal volume segmentation of the back cavity through the inner variable cross-section partition, and the structure is relatively simple. This study provides a design idea for broadband low-frequency sound absorption and its application of MPP absorbers.