基于声压-质点速度声强探头的材料吸声系数的测量  

Measurements of the absorption coefficients with a combined particle velocity-pressure sound intensity probe

作　　者：李凌志 程攻 刘英杰 卢炳武 

机构地区：[1]汽车振动噪声与安全控制综合技术国家重点实验室,长春130011 [2]中国第一汽车集团股份有限公司技术中心,长春130011

出　　处：《应用声学》2012年第3期202-208,共7页Journal of Applied Acoustics

基　　金：中国第一汽车集团股份有限公司科技创新项目(编号1052)

摘　　要：通过由一个声压换能器和一个质点速度换能器所构成的传感器(p-u声强探头)同时测量材料表面附近的声压和质点振动速度,可直接得到其声学阻抗,进而得到材料的反射因子、吸声系数。本文利用一个p-u探头声强测量系统,在半消声室内测量了三聚氰胺泡沫的吸声系数,分析了声源高度和入射角度、材料样本尺寸和厚度对吸声系数测量的影响,并和阻抗管中测量得到的法向吸声系数进行了对比。最后分析了声阻抗率的幅值和相位误差对吸声系数的影响,推导了它们的误差传递公式。Using a combined particle velocity-pressure sensor （p-u sound intensity probe）, the acoustic impedance of an absorbing materials, and consequently its reflection factor and absorption coefficient, can be determined by simultaneous measurements of sound pressure and particle velocity at a position near the surface of the materials. Using a p-u intensity probe system in a semi-anechoic room, we measured the acoustic impedance of melamine, and analyzed how the source height, incidence angle, the size and thickness of the materials sample affect the measurement, and compared to the normal impedance measured using a standing wave tube. We also analyzed how the amplitude and phase error of the acoustic impedance affect the absorption coefficient, and derived an error propagation formula.

关 键 词：p-u声强探头 吸声系数 声阻抗率 误差分析 

分 类 号：O429[理学—声学]