微缝吸声板吸声性能探讨

Discussion on Sound Absorption Performance of Mic-slit Sound Absorbing Board

为了研究微缝吸声板的几何参数对其吸声性能的影响,以微孔吸声板理论为基础,设计制作了微缝吸声板,对微缝吸声板进行阻抗管试验并与仿真模拟结果进行对比分析,仿真结果与试验结果基本一致。通过仿真不同几何参数下微缝吸声板的相对声阻抗,计算得出吸声系数进行对比,结果表明,当缝宽和膜厚相对增加时,微缝吸声板的吸声峰值和吸声带宽均略有减小。

In order to study the effect of geometric parameters on the sound absorption performance of micro-slit board,micro-slit sound absorbing board was designed and manufactured based on the theory of micro-porous sound absorption board.Impedance tube tests were carried out on the micro-slit sound absorbing board and the simulation results were compared and analyzed,and the simula-tion results were basically consistent with the experimental results.Then,by simulating the relative acoustic impedance of micro-slit sound absorbing board with different geometric parameters,the a-coustic absorption coefficient was calculated and compared.The results show that when the slit width and film thickness increase,the sound absorption peak value and the sound absorption band-width of the micro-slit sound absorbing board decrease slightly.