大尺寸弹性材料中声速的实验室测量方法研究  

Research on sound velocity measurement in laboratory for large elastic material

作　　者：祝捍皓[1,2] 朴胜春[1,2] 张海刚[1,2] 刘伟[1,2] 安旭东[1,2] 

机构地区：[1]哈尔滨工程大学水声工程学院,哈尔滨150001 [2]哈尔滨工程大学水声技术重点实验室,哈尔滨150001

出　　处：《声学学报》2014年第1期49-58,共10页Acta Acustica

基　　金：国家自然科学基金(11104044;11234002);国防科技重点实验室基金(9140C200103110C20)资助

摘　　要：针对大尺寸弹性材料中声速的测量问题,将传统穿透测量法与分层介质中的射线声学理论相结合,设计了一种在水池中反演测量材料中纵、横波声速的方法.该方法使用水听器接收透过待测材料后到达的高频水声信号,依据实测信号传播时间与理论值比较代价函数,最终利用寻优算法计算材料中的两类声速。本方法既克服了传统方法不能同时获得材料内纵、横波声速的缺点,又可保证待测材料的完整性。利用开发的测量系统,水池实际测量结果的不确定度小于3.5%A measurement scheme carried out in a tank is designed to obtain the compressional- and shear-wave velocity of large elastic material. A hydrophone is used to receive the high frequency acoustic signals which penetrate the tested material, in order to determine the transmission time from source to hydrophone, the transmission time is also calculated according to the ray acoustic theory in layered media. A cost function is built based on the measured and the calculated transmission time, then the compressional- and shear-wave velocity can be obtained using the optimization algorithm. Compared with traditional measurement scheme, this approach can not only get the 2 kinds of sound velocity in tested material at the same time, but also keep the integrality of the tested material. With the proposed measurement system, the uncertainty of measurement result is less than 3.5%.

关 键 词：弹性材料 横波声速 测量方法 大尺寸 实验室 水声信号 传统方法 利用开发 

分 类 号：TB302[一般工业技术—材料科学与工程]