吸声系数的先进现场测试技术发展概述

首先介绍了最常用的测试吸声系数的驻波管法与混响室法并阐述了两种方法优缺点。驻波管法测试的是法向吸声系数,混响室法得到的是各个入射方向的平均吸声系数,两种方法测试时均与实际安装情况存在一定差异,难以完成现场复杂环境下吸声系数的准确测试。而很多情况下,需要测试得到的是实际工作环境中的吸声系数,于是总结了传递函数法、PU矢量法、参量阵扬声器法、脉冲响应法、倒频谱法、最长序列数法以及减法技术等吸声系数的现场测试方法的原理与研究进展,分析了各测试方法的优缺点。

Development of Advanced In-situ Measurement Technology for Sound Absorption Coefficient

Firstly, the work introduced the most commonly used standing wave tube method and reverberation chamber method for testing sound absorption coefficient and expounded the advantages and disadvantages of the two methods. The standing wave tube method tested the normal sound absorption coefficient, and the reverberation chamber method obtained the average sound absorption coefficient in each incident direction. There were certain differences between the two methods and the actual installation conditions. It was difficult to complete the measurement of sound absorption coefficient accurately in the complex environment. In many cases, sound absorption coefficient in the actual working environment should be tested. Thus the principle and research progress of in-situ measurement methods for sound absorption coefficient include the transfer function method, PU vector method, parametric array speaker method, impulse response method, cepstrum method, longest sequence number method and subtraction technique were summarized. And the advantages and disadvantages of each test method were analyzed.