微穿孔板吸声体参数灵敏度分析

轻质耐高温的微穿孔板吸声体的吸声性能主要受腔深、孔径、板厚、穿孔率四个参数的制约，通过等比例减小和增大这些参数来观察微穿孔板吸声体吸声性能的改变。引入吸声系数变化率的概念，以吸声系数变化率作为衡量标准，判断参数的改变对结构吸声性能的影响。整体而言，影响吸声性能的敏感度从高到低的微穿孔板吸声体参数顺序为：腔深、孔径、穿孔率、板厚。研究结果可为工程人员利用微穿孔板吸声体降噪时设计吸声体尺寸提供一定的指导。

Analysis on parameter sensitivity of the micro-perforated panel sound absorber

The sound absorption performance of lightweight and high temperature resistant micro-perforated panel absorber (MPPA) is mainly restricted by four parameters: cavity depth, aperture, panel thickness and perforation rate. The change of the sound absorption performance of micro-perforated panel absorber is observed by decreasing and increasing these parameters in equal proportion. The concept of change rate of sound absorption coefficient is introduced, which is taken as the measuring standard to judge the influence of changing these parameters on the sound absorption performance of the micro-perforated panel structure. Generally, the order of the four parameters with the sensitivities affecting sound absorption performance from high to low is as follows: cavity depth, aperture, perforation rate, and panel thickness. The research results can provide some guidance for engineers to design the size of the micro-perforated panel absorber when it is used for noise reduction.