错位微缝板吸声性能研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (14) : 69-74.

论文

错位微缝板吸声性能研究

蒋从双，李贤徽，邢拓

作者信息 +

Acoustic performance of a micro-staggered structure

JIANG Congshuang，LI Xianhui，XING Tuo

Author information +

文章历史 +

摘要

目前，微穿孔板和微缝板吸声理论成熟、应用广泛。两者均是基于薄板提出的理论，其工程应用范围也因薄板而受到限制。错位微缝板融合了微穿孔板和微缝板，由双层板错位交叠而成，每层板由一系列微缝组成，上下两层微缝交错处形成微孔。交错后的微缝只在交汇的微孔处是通透的，交错形成的微孔仅是一个微孔截面，几何厚度为零。对错位微缝板进行粘热声学仿真，得到结构的相对声阻抗和吸声系数与实验数据一致性较好。仿真分析表明，结构的微孔截面处声压梯度和空气粒子振动速度最大，其粘热声能耗散主要集中在微孔截面的边界处，错位微缝板的厚度对吸声性能的影响远小于微穿孔板和微缝板，可以在厚板上实现较好的吸声性能。

Abstract

Now, the theory of micro-perforated plate (MPP) and micro-slitted plate (MSP) is mature and the applications are widespread. However, the theory is constructed based on thin plate, which refines the applications in typical engineering. Micro-staggered structure (MSS) is a combination of MPP and MSP, which is made by overlapping and staggering two layers of plates. Each layer is constituted by arranging an array of strip-shaped sheets separated by a certain space. Micro slits are formed at between those strip-shaped sheets and micro apertures are constructed at intersection of those micro slits. The micro slits are open to the air completely on one side but blocked largely by the sheets on the other side. The micro apertures are just a layer of cross contour taken shape by the two layers of plates and its geometrical thickness equals to zero. Thermoviscous acoustics simulation of MSS is conducted. A good agreement of acoustic impedance and sound absorption coefficient is achieved between simulated results and the experimental data. The simulation shows that the maximum pressure gradient and particle velocities are on the cross contour and the concentration of thermal-viscous energy loss is taking place at the boundary of the cross contour. It also demonstrates the effect of plate thickness on acoustic performance of MSS is much less than that of MPP and MSP, which help to achieve good acoustic properties on a thick plate.

导出引用

蒋从双，李贤徽，邢拓. 错位微缝板吸声性能研究[J]. 振动与冲击, 2020, 39(14): 69-74

JIANG Congshuang，LI Xianhui，XING Tuo. Acoustic performance of a micro-staggered structure[J]. Journal of Vibration and Shock, 2020, 39(14): 69-74

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