水下声源辐射声功率测量实验研究  

Measurement of the radiated power of sound sources in a reverberation pool

作　　者：尚大晶[1] 李琪[1] 商德江 侯本龙[1] 

机构地区：[1]哈尔滨工程大学水声技术实验室

出　　处：《哈尔滨工程大学学报》2010年第7期938-944,共7页Journal of Harbin Engineering University

基　　金：水声技术实验室基金资助项目(9140C2007021005)

摘　　要：针对水下声源辐射声功率测定问题,提出了一种混响水池测量方法.通过在混响水池内测量声源的空间平均声压功率谱,并对混响水池的声场进行校准,可以得到声源在自由场条件下的辐射声功率.研究了声源位置、声源与水听器的不同距离等对空间平均声压功率谱测量结果的影响,分析了在混响水池中测量声源辐射声功率的下限频率与水池尺度的关系.对空间平均功率谱进行了测量不确定度分析,其A类不确定度不大于1 dB.通过混响时间计算的混响场条件下的声源辐射声功率至自由场的修正量与实测修正量之间的差别不超过1 dB.该方法同时适用于水下复杂声源或具有一定空间分布声源的辐射声功率的测量.A reverberation pool method was proposed to measure the power radiated by underwater sound sources.The spatially averaged power spectrum in the pool was measured and converted to the equivalent free field power spectrum of the sound sources.This was done by exactly calibrating the sound field of the reverberation pool.The effects of the position of the sound source in the pool,of the distance between the sound source and the hydrophone,as well as other influences on the measured results of the spatially averaged power spectrum were investigated.The relationship between the safety frequency limitation for measuring the power radiated by sound sources in the reverberation pool and the dimensions of the pool were analyzed.The measurement uncertainties for the spatially averaged power spectrum were found to have an A-class uncertainty of less than 1 dB.The difference between the power of sound sources in a reverberation pool and their power in a free field were calculated by measuring reverberation time.The difference was found to be not more than 1 dB.This indicated that the proposed method is also useful for measuring the power radiated by underwater sound sources with complex structures or special spatial distributions.

关 键 词：声源 辐射声功率 混响水池 混响时间 

分 类 号：TB566[交通运输工程—水声工程]