Abstract
This study investigates a dual-cavity resonant composite sound-absorbing structure based on a micro-perforated plate. Using the COMSOL impedance tube model, the effects of various structural parameters on sound absorption and sound insulation performances are analyzed. Results show that the aperture of the micro-perforated plate has the greatest influence on the sound absorption coefficient; the smaller the aperture, the greater is this coefficient. The thickness of the resonance plate has the most significant influence on the sound insulation and resonance frequency; the greater the thickness, the wider the frequency domain in which sound insulation is obtained. In addition, the effect of filling the structural cavity with porous foam ceramics has been studied, and it has been found that the porosity and thickness of the porous material have a significant effect on the sound absorption coefficient and sound insulation, while the pore size exhibits a limited influence.
Highlights
This study proposes a dual-cavity resonance composite sound-absorbing and insulating plate structure based on micro-perforated plates, and simulates its acoustic performance based on the COMSOL impedance tube model
Plates Based on the theory of micro-perforated plate resonance sound absorption, this study proposes a doublecavity composite sound-absorbing and insulating structure, which has good low-frequency sound absorption and sound insulation performance, and is suitable for low-frequency noise control
The sound absorption coefficient is calculated by the transfer function method, and the sound insulation is derived from the sound absorption coefficient and transmission loss formula
Summary
With societal development and the increasing awareness of the need for environmental protection, the study of noise pollution has attracted considerable attention in recent years. Conventional materials have a limited ability to control low-frequency noise Due to their excellent low-frequency acoustic performance, micro-perforated plates have been extensively studied by scientific researchers [1–3]. Liu et al [16], aiming at poor efficiency of the traditional materials in low-mid frequency sound absorption and its narrow bandwidth, present an ultra-broadband acoustic metamaterial whose basic cell is constructed by dividing the original neck of a Helmholtz resonator into multiple smaller ones, and the neck panel becomes into a micro-perforated panel that can achieve a near-perfect continuous absorption within 380–3600 Hz, with a thickness of only 7.2 cm. Compared with broadband noise reduction materials, micro-perforated plates have a narrower sound absorption frequency band, and there is limited research on its sound insulation [18–21]. The structural parameters of the optimized composite panel are determined, so that it has better sound absorption performance and higher sound insulation
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