一种非自由声场中声源表面振速重构简化方法  

A Simplified Method for Reconstructing Surface Velocities of Sound Sources in Non-free Fields

作　　者：刘馨悦 胡定玉[1] 张满迎 潘硕 王涛 LIU Xinyue;HU Dingyu;ZHANG Manying;PAN Shuo;WANG Tao(School of Urban Rail Transportation,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学城市轨道交通学院,上海201620

出　　处：《噪声与振动控制》2020年第2期33-38,共6页Noise and Vibration Control

基　　金：国家自然科学基金青年基金项目(51605274)。

摘　　要：在非自由声场中利用近场声全息技术重构声源表面振速时,需要先去除干扰声及干扰声在声源表面的散射声对重构结果的影响。针对刚性边界的声源提出一种非自由声场中表面振速重构的简化方法。该方法利用声源表面的刚性边界条件,只需一步求逆过程即可实现干扰声和散射声的去除以及声源表面振速重构。在仿真中选取简支铝板作为目标声源进行分析,结果表明该方法能够在非自由声场中实现声源表面振速的准确重构。最后通过实验进一步证明了该方法的有效性。When applying near-field acoustic holography to reconstruct the surface velocities of the sound sources in the non-free sound field,it is necessary to remove the influence of the disturbing sound and the scattering sound.In this paper,a simplified method for surface velocity reconstruction in a non-free sound field is proposed.In this method,by utilizing the rigid boundary conditions of the surface of the sound source,the removal of the disturbing sound and the scattering sound and the reconstruction of the vibration velocity of the sound source surface can be realized by only one step of inversing process.In the simulation,the surface velocity of a simply supported aluminum plate is reconstructed in a non-free field.The results show that the proposed method can accurately reconstruct the surface velocity of the sound source.Finally,the effectiveness of the proposed method is further validated by experiments.

关 键 词：声学 非自由声场 近场声全息 散射声 振速重构 声源振速 

分 类 号：TB532[理学—物理]