基于局部测量的复杂封闭空间结构表面声振响应重建方法  

A method for reconstructing surface vibro-acoustic responses of an irregular enclosure based on patch measurements

作　　者：肖悦[1] 张兴旺[1] 初长宝[1] 盛敬[1] 寇桂岳[1] XIAO Yue;ZHANG Xingwang;CHU Changbao;SHENG Jing;KOU Guiyue(School of Mechanical Engineering,Nanchang Institute of Technology,Nanchang 330099,China)

机构地区：[1]南昌工程学院机械工程学院,江西南昌330099

出　　处：《南昌工程学院学报》2021年第6期69-77,共9页Journal of Nanchang Institute of Technology

基　　金：江西省教育厅科学技术研究项目(GJJ151121,GJJ170989,GJJ201914);国家自然科学基金资助项目(51565037,52165015);江西省自然科学基金资助项目(20181BAB206022);江西省教育科学“十三五”规划项目(19YB233);江西省高等学校教学改革研究项目(JXJG-18-18-1)。

摘　　要：针对由复杂封闭空间结构振动形成的内部声场,提出了一种基于局部近场声全息声场分离技术的结构表面声振响应重建方法。该方法利用等效源法实施方便、计算稳定且适用于任意声源形状的特点,可根据实际需要有针对性地对振动结构上所感兴趣的局部区域进行建模,而不必对整个振动声源进行全场测量。通过在覆盖局部振动区域的两个半封闭表面上完成一组声压测量,利用基于等效源法的双面声场分离技术去除来自测量面背侧的干扰声,再结合结构表面的导纳边界将干扰声在其表面的散射场分离出来,还原在自由场条件下的辐射声场,实现对振动结构表面声压与法向振速的重建,进而获得该区域表面各单元对内部声场的辐射声功率。数值仿真实验结果验证了所提方法的有效性和正确性,可为解决复杂封闭空间结构的振动噪声治理问题提供一种有效手段。Considering the interior sound field formed by the vibration of the irregular enclosure,a method for reconstructing the surface vibro-acoustic responses using patch nearfield acoustic holography based on the sound field separation technology is proposed.Taking advantages of the equivalent source method,which is easy to implement,stable in calculation,and easy to implement and applicable to any sound source shape,it can be targeted to investigate the patch area of interest on the vibrating structure according to actual needs without full field measurements of entire vibrating source.By implementing a set of acoustic pressure measurements on two semi-closed surfaces covering the vibrating patch area,the sound field separation technique with double-layer based on the equivalent source method is used to remove the interference sound from the opposite side of measurement surface.Combined with the surface admittance,the scattering field of the interference sound on the surface is separated to recover the radiated sound field under the free field condition and realize the reconstruction of the surface acoustic pressure and normal vibration velocity on the surface of the vibrating patch area.Then the radiated sound power of each unit on the surface of the patch area to the interior sound field is obtained.The numerical experiments are conducted to demonstrate the validity of the proposed method,and the simulation results show that it can accurately reconstruct the surface vibro-acoustic responses on the vibrating source and can provide an effective way to solve the problem of vibration and noise control of the irregular enclosure.

关 键 词：声场分离 局部近场声全息 等效源法 双面 

分 类 号：TB532[理学—物理]