结构参数对微穿孔板结构声学特性的影响研究

Effects of Structure Parameters on the Sound Absorption of Micro-perforated Panel Absorber

微穿孔板结构声学特性与结构参数密切相关,该文讨论了这些结构参数对吸声性能的影响。采用传递矩阵法计算微穿孔板结构的声学特性,在验证理论计算结果可靠的基础上,研究结构参数(如穿孔率、微孔直径、板厚和空腔距离)对微穿孔板结构吸声性能的影响规律。结果表明,穿孔直径、板厚和穿孔率主要影响吸声结构的共振吸声峰值,空腔厚度主要影响共振基频;共振吸声峰值随穿孔率、微孔直径和空腔厚度增加而降低,随板厚增加而增大。增加穿孔率,共振基频向低频移动;而增加微孔直径、板厚和空腔厚度,共振基频向高频移动;吸声频带宽度随穿孔率增大而增加,随微孔直径、板厚和空腔厚度增加而变窄。

Since the sound absorption of micro-perforated panel absorber （MPA） was bound up with structure parameters, so the effects of these parameters on the sound absorption of micro-perforated panel absorber was inves- tigated. The reliability of the theoretical results calculated by transfer matrix method was checked. The influence of the perforation rate, perforation diameter, plate thickness and cavity depth of MPA on acoustic characteristics was then discussed. The results indicated that the main factors influencing the resonant sound absorption were perfora- tion rate, perforation diameter and plate thickness, and that the resonance frequency of MPA was determined by cavity depth. The resonant sound absorption＇ decreased with the increase of the perforation rate, perforation diame- ter and plate thickness,and increased with the raising of cavity depth. The sound absorption curves moved to the low frequency zone and frequency bandwidth increased with the raising of perforation rate. However, when the perfora- tion diameter and plate thickness and cavity depth of MPA increased, sound absorption curves moved to the high frequency zone and the frequency bandwidth decreased at the same time.