基于p-u探头测试法的双层微穿孔吸声体吸声性能试验研究

微穿孔吸声体广泛应用于建筑、汽车、航空航天等领域。文章基于p-u探头测试法研究双层微穿孔吸声体声腔体积对其吸声性能的影响。通过与阻抗管中测量得到的吸声系数对比，验证了p-u探头法测量双层微穿孔吸声体的吸声系数的适用性，弥补了传统阻抗管测试法无法测试真实尺寸试件的缺点。测量结果表明双层微穿孔吸声体板后声腔共振能提升吸声体的吸声性能，因此可以将合理设计声腔共振频率作为微穿孔吸声体优化设计的新思路。

Experimental study of sound absorption performance of double layer micro-perforated sound absorber by using p-u sound intensity probe

Microperforated sound absorbers are widely used in the construction, the automobile, the aerospace and other fields. In this paper, the p-u sound intensity probe is used to study the effect of the cavity volume of the double-layer micro-perforated sound absorber on the sound absorption performance. By comparing with the sound absorption coefficient measured in the impendance tube, it is verified that the p-u sound intensity probe can be used to measure the sound absorption coefficient of the double layer micro-perforated sound absorber effectively, and it can also be used under the real size of the test piecee, while the traditional impedance test method can not. The measurement results by using the p-u sound intensity probe show that the cavity resonance can improve the sound absorption performance of the double-layer micro-perforated sound absorber, and the reasonable design based on the cavity resonance frequency is a new idea for the optimal design of the micro-perforated sound absorber.