利用起伏界面改善非消声水池中的声功率测量  

Sound power measurements in a non-anechoic tank with random surface

作　　者：谢丁丁 李琪[1,2,3] 唐锐 尚大晶[1,2,3] 任超[1,2,3] XIE Dingding;LI Qi;TANG Rui;SHANG Dajing;REN Chao(National Key Laboratory of Underwater Acoustic Technology,Harbin Engineering University Harbin,150001;Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University),Ministry of Industry and Information Technology Harbin,150001;College of Underwater Acoustic Engineering,Harbin Engineering University Harbin,150001)

机构地区：[1]哈尔滨工程大学水声技术全国重点实验室,哈尔滨150001 [2]工业和信息化部海洋信息获取与安全工信部重点实验室(哈尔滨工程大学),哈尔滨150001 [3]哈尔滨工程大学水声工程学院,哈尔滨150001

出　　处：《声学学报》2023年第3期524-531,共8页Acta Acustica

基　　金：国家自然科学基金项目(11874131);哈尔滨工程大学博士研究生科研创新基金项目(XK205002102801)资助。

摘　　要：针对非消声水池的声学测量应用,提出了一种在界面起伏的非消声水池中测量水下声源辐射声功率的方法。基于数值方法分析了在非消声水池中利用起伏界面改善低频声源辐射声功率测量的可行性,进一步在一个尺寸为1.2 m×1.0 m×0.8 m的非消声水池中开展实验研究,测量了水声换能器的辐射声功率。实验表明,相对于界面静止的水池,利用造波装置生成随机起伏界面后,声场扩散性明显改善:(1)水池的Schroeder频率从10015 Hz降低到8370 Hz,辐射声功率的测量范围向低频扩展;(2)结合空间平均技术测得的频响曲线起伏程度减小,与自由场值更接近,辐射声功率的测量结果更为准确。所提方法有助于提高非消声水池中水下目标声学特性的测量能力。A method that uses a random surface to improve measurements of the radiated sound power in a non-anechoic tank is proposed.Based on the finite element method,the feasibility of improving sound power measurements at low frequencies by random surface in a non-anechoic pool is analyzed.The sound power of a spherical source is measured in a non-anechoic tank with a size of 1.2 m×1.0 m×0.8 m.Experimental results show that in contrast to a tank with a steady surface,once a random surface is generated using a water pump,the diffusion is significantly improved:(1)the Schroeder frequency is decreased from 10015 Hz to 8370 Hz,indicating the range of measurement is extended to lower frequencies;(2)the frequency response curves measured by spatially averaging techniques have smaller fluctuation and is closer to free-field value,that is,the accuracy of measurement is significantly improved.The proposed method contributes to obtaining more accurate narrowband measurements of underwater target acoustic characteristics in underwater environment environments.

关 键 词：辐射声功率 扩散体 非消声水池 混响声场 声学测量 

分 类 号：TB565[交通运输工程—水声工程]