等效场变换理论及浅海声辐射计量  

Equivalent field transformation theory and acoustic radiation measurement in shallow sea

作　　者：何呈 王彪[1] 罗成名 马林 李晓曼 HE Cheng;WANG Biao;LUO Chengming;MA Lin;LI Xiaoman(College of Electronic Information,Jiangsu University of Science and Technology,Zhenjiang 212000,China)

机构地区：[1]江苏科技大学电子信息学院,江苏镇江212000

出　　处：《振动与冲击》2022年第13期119-125,134,共8页Journal of Vibration and Shock

基　　金：国家自然科学青年基金项目(12004143,62001195)。

摘　　要：针对声辐射计量往往受测试环境、声源几何形状、材质和运动状态限制的问题,提出了一种获取特定空间内任意声源辐射声场的理论——等效场变换理论(equivalent field transformation,EFT),并得出观测空间权系数的选取标准和判别依据:当观测空间上的声收发合置装置在权系数的加权下,目标空间中的声场与待测点单位无指向性点源激发的声场一致时,便可通过观测空间上的观测值与权系数获得目标空间内任意声源在待测点的声场。进一步给出了EFT的在自由场、浅海环境所能测量的声场范围。通过仿真试验分别在自由场和浅水环境使用EFT获取了有限长线源的辐射声场,结果与理论值吻合。Here,aiming at the problem of sound radiation measurement being often limited by test environment,sound source geometric shape,material and motion state,a theory to obtain radiation sound field of any sound source in a specific space called the equivalent field transformation(EFT)theory was proposed.The authors deduced the observation space weight coefficient's selection standard and discrimination basis which were that when the sound transmit-receive combined device in observation space is weighted by weight coefficient,and the sound field in target space is consistent with the sound field excited by unit non-directional point source at point to be measured,the sound field of any sound source at point to be measured in target space can be obtained by using observation value and weight coefficient in observation space.Furthermore,the range of sound field being able to measure using EFT in free field and shallow water environment was given.Radiation sound fields of finite-length line source were obtained using EFT in environments of free field and shallow water,respectively through simulation tests,and the results agreed well with theoretical values.

关 键 词：等效场变换(EFT) 空间声场映射 非自由场环境 声辐射计量 

分 类 号：O427[理学—声学]