平面近场声全息信噪比估计方法研究  

Estimation of the signal to noise ratio in planar acoustical holography

作　　者：万海波[1] 朱石坚[1] 楼京俊[1] 丁少春[1] 

机构地区：[1]海军工程大学动力工程学院,武汉430033

出　　处：《振动与冲击》2016年第6期96-99,共4页Journal of Vibration and Shock

基　　金：高等学校全国优秀博士学位论文作者专项资金(201057)

摘　　要：针对全息面复声压信噪比对声场重构结果影响较大、往往不能直接测量问题,采用二维小波分析方法进行全息面信噪比参数估计,分析小波函数、分解层级对信噪比估计准确性影响,明确二维小波分析的参数选取,并以受简谐激励作用的四周无限大障板简支钢板为对象进行辐射声场全息重构仿真分析。结果表明,信噪比参数对实现准确声场全息重构十分重要,用二维小波分析方法进行全息面信噪比参数估计有效且可行。The complex signal to noise ratio of pressure on an acoustic holography surface has a great influence on the precision of reconstruction results, however it cannot be measured directly. To solve this problem, the method of two- dimension wavelet analysis was proposed, and the effects of wavelet function and decomposition level were analyzed, which will help the decision making for parameters selection in the two-dimension wavelet analysis. The proposed method was validated by suing the synthetic sound field created by a point-driven, simply supported plate. The result show that the two-dimension wavelet analysis used to estimate the complex signal to noise ratio of pressure is feasible.

关 键 词：近场声全息 信噪比估计 小波分析 滤波窗 

分 类 号：O322[理学—一般力学与力学基础]