Acoustic performance of a micro-staggered structure

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (14) : 69-74.

JIANG Congshuang，LI Xianhui，XING Tuo

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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.

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micro-staggered structure / micro-perforated plate / micro-slitted plate

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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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