新型组合近场声全息技术  

Novel combined near-field acoustic holography

作　　者：张子鑫 肖友洪[1] 魏富康 ZHANG Zixin;XIAO Youhong;WEI Fukang(College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2022年第2期228-234,254,共8页Journal of Harbin Engineering University

基　　金：国家科技重大专项(2019-II-0013-0034);中央高校基本科研业务费(3072021CFT0302).

摘　　要：近场声全息技术是一种有效的声场可视化技术,当场点声压测量数较少时,该技术重建复杂声场存在重建精度不高的问题。针对此问题,本文提出了一种新型组合近场声全息技术,通过统计最优近场声全息实现全息面声压的数据外推,外推后的声压作为声场重建的输入,采用边界元法和压缩感知相结合技术,重建较少场点条件下复杂声场。针对矩形板开展了仿真与实验验证研究,结果表明:在测量场点较少时,采用组合近场声全息技术可有效提高重建精度,沿x、y方向分别外推2个阵元间距,即可获得较好的重建结果,分析频段内的平均重建误差降低了20.8%,验证了算法的有效性。Near-field acoustic holography(NAH)is an effective acoustic visualization technology.A small number of sound pressure measurements at field points induces low precision for the reconstruction of a complex sound field by NAH.A novel combined NAH is proposed to address the aforementioned problem in this paper.First,the sound pressure of the holographic surface is extrapolated by the statistical optimal NAH(SONAH),and the extrapolated sound pressure is used as the input of sound field reconstruction.Then,the complex sound field with fewer field-point measurements is reconstructed by combining the boundary element method and compressed sensing.A rectangular plate is also taken as an object to conduct simulation and experimental verification.Results show that the combined NAH can effectively improve the reconstruction accuracy in the presence of a few field points.Moreover,satisfactory reconstruction results can be obtained by extrapolating two-array element spacing along the x-and y-directions.The average reconstruction error in the analysis frequency band is reduced by 20.8%,which verifies the validity of the algorithm.

关 键 词：少场点测量 重建精度 数据外推 统计最优近场声全息 边界元法 压缩感知 组合近场声全息 

分 类 号：TB535[理学—物理]