消声室声学性能评价方法探讨  

Discussion on performance assessment of anechoic rooms

作　　者：蒲志强[1] 姚小兵[1] 孙磊[1] 鄂治群[1] 

机构地区：[1]中国测试技术研究院,四川成都610021

出　　处：《中国测试》2012年第5期25-28,共4页China Measurement & Test

摘　　要：消声室和半消声室声学性能评价是通过比较室内的声源空间衰减的声压级与满足反平方律声压级的差值来确定的。在运用JJF 1147-2006《消声室和半消声室声学特性校准规范》时却出现了理论曲线与测量值呈现出"远端对齐"不合理现象,导致评估困难甚至无法评估。通过实验数据分析,发现JJF 1147-2006选择声压倒数标准偏差为最小二乘法判断依据是导致出现不合理现象的根本原因,并由此提出两个改进评价方法。The performance of the anechoic and hemi-anechoic room is assessed by comparing the spatial decrease of sound pressure emitted from a test source with the decrease of sound pressure with distance from the source according the inverse square law that would occur in true anechoic or hemi-aneehoic field. When JJF 1147-2006 calibration specification for acoustic performance of anechoic rooms and hemi-anechoic rooms is applied in practice, some unreasonable phenomenon will occur and make the assessment difficult or even impossible. Experimental data analyses show using the least sum of reciprocal of sound pressure as judgment in least square method in JJG 1147-2006 is not appropriate and is the main cause for unreasonable phenomenon occurred. Therefore, two improved methods were suggested.

关 键 词：消声室和半消声室 声学性能评价 自由场 最小二乘法 

分 类 号：TB52[理学—物理] TB95[理学—声学]