混响室吸声测量中旋转扩散体角度状态及顶角测点位置的影响  

The influence of angle states of rotated diffuser and corner measuring position on the measurement of sound absorption in reverberation room

作　　者：尹昊[1] 沈勇[1] 刘紫赟[1] 薛政[1] 

机构地区：[1]近代声学教育部重点实验室南京大学声学研究所,南京210093

出　　处：《声学学报》2016年第5期694-703,共10页Acta Acustica

基　　金：国家科技支撑计划项目(2012BAH38F03-02)资助

摘　　要：通过对3个吸声构件进行了多测点的混响室吸声测量的实验结果进行分析,发现旋转扩散体静止在不同角度状态对测量结果有显著影响,进而提出同一测点在多个旋转扩散体的角度状态下进行测量的测量方法。并使用这一测量方法,比较了混响室顶角测点位置和与按照ISO标准和国标要求选择的空间测点位置所得的测量结果,分析得出顶角测点和空间测点的平均结果是一致的,且顶角位置处的测量结果拥有更小的离散度。因此可以在矩形混响室角落设置少量测点,通过改变旋转扩散体角度状态进行混响室吸声测量。The experiment results of sound absorption measurement of three sound absorption components were analyzed. It is found that static states of rotated diffuser in different angles have significant impact on the result of the measurement and a method of measuring in multiple static states of rotated diffuser is proposed. A comparison of the measurement results of locating measuring position to the corners of reverberation room and selecting measuring position according to ISO and national standard is made by using the proposed method. The mean result of both kinds of measurement locations are accordant, and less deviation can be achieved by locating measuring position to the corners of reverberation room. It is concluded that sound absorption in a reverberation room can be measured by locating less measuring position to the corners of rectangular reverberation room and changing states of rotated diffuser in different angles.

关 键 词：矩形混响室 吸声测量 多测点 扩散体 角位置 状态 旋转 顶角 

分 类 号：TB52[理学—物理]