基于声振耦合的曲面微穿孔板吸声特性研究及试验分析

Research and experimental analysis of sound absorption characteristics of acurved micro-perforated panel based on coupled vibro-acoustic

采用了声电类比法分析曲面微穿孔板(curved micro-perforated panel,CMPP)的吸声特性,并根据瑞丽积分法求解了曲面板的自由振动特性,借助声振耦合原理获取了在考虑板的振动时微穿孔板的吸声特性,并给出了结构参数如穿孔率、孔径、板厚、曲率半径、背腔深度、板的长宽比等对曲面微穿孔板吸声系数的影响。根据理论模型,该研究设计了阻抗管装置并测量了曲面微穿孔板的吸声系数,其中对不同穿孔率下的吸声系数进行了测量。结果显示:随着穿孔率和孔径的增大,由微孔引起的吸收峰值降低,吸声带宽变小;随着板厚的增加,由于板的共振引起的吸声峰向高频移动,由于微孔引起的吸声峰向低频移动,证明了理论模型的准确性。

A acoustic-electrical analogy method was used to analyze the sound absorption characteristics of a curved micro-perforated panel(CMPP),and the free vibration characteristics of the curved panel were solved by the Rayleigh integral method.Based on the principle of coupled vibro-acoustic,the sound absorption characteristics of the micro-perforated panel considering panel vibration were obtained.The effects of structural parameters such as perforation rate,aperture,panel thickness,radius of curvature,depth of back cavity,and panel aspect ratio on the sound absorption coefficient of CMPP were analyzed.According to the theoretical model,the impedance tube device was designed to measure the sound absorption coefficients of CMPP,which were measured under different perforation rates and apertures.Results obtained show that as the perforation rate and aperture increase,the absorption peak caused by micropores decreases and the sound absorption bandwidth becomes narrower.With the increase of the panel thickness and the sound absorption peak caused by the resonance of the panel moves to high frequency,while the sound absorption peak caused by micropores moves to low frequency,which proves the accuracy of the theoretical model.