非自由声场中目标声源粒子速度场的重构  

Reconstruction of Particle Velocity Field of a Target Source in a Non-free Sound Field

作　　者：周达仁 肖永雄 卢奂采[1] ZHOU Daren;XIAO Yongxiong;LU Huancai(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学机械工程学院,杭州310023

出　　处：《噪声与振动控制》2021年第3期34-40,共7页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51975525);浙江省科技计划资助项目“一带一路”国际合作专项资助项目(2018C04018);国家重点研发计划资助项目(2017YFC0306202)。

摘　　要：针对非自由声场中目标声源辐射粒子速度场的重构问题,提出了以单层粒子速度测量面为测量前端的重构方法。该方法以两组球面波扩展函数分别描述目标声源和干扰声源的辐射粒子速度场,通过求逆求解两组基函数的系数,同时也获得目标声源的基函数系数,重构出目标声源辐射的粒子速度场。分别以球面声源和极端非球面声源作为干扰声源,重构出球面目标声源辐射的粒子速度场,对所提方法进行数值仿真验证。在全消声室中以两个扬声器作为声源,使用P-U探头采集非自由场的粒子速度信息,重构出目标扬声器声源的辐射粒子速度场。结果表明:该方法能以较高的精度重构出球面和非球面声源干扰下的目标声源的辐射粒子速度场,球面声源作为干扰声源时的重构精度更高。A reconstruction method using a single-layer particle velocity hologram surface as the measurement frontend was proposed to reconstruct the particle velocity field radiated from a target source in a non-free field.Two sets of spherical expansion wave functions were employed to describe the particle velocities radiated from the target source and the disturbing source respectively.By solving the inverse problem,the coefficients of the basic functions were obtained,and the coefficients corresponding to the particle velocity field of the target source were also obtained.Then,the particle velocity field radiated from the target source was reconstructed.In numerical simulations,either a spherical source or a highly non-spherical source was used as the disturbing source,the particle velocity field radiated from a spherical target source was reconstructed to verify the proposed method.Experimental verification was conducted in an anechoic chamber.Two speakers were used to generate a non-free sound field,with an array of P-U probe collecting the particle velocities.The particle velocity field radiated from the target speaker was reconstructed.The results show that the proposed reconstruction method exhibits the satisfactory accuracy in reconstructing a spherical target source in the presence of a spherical disturbing source or a highly nonspherical disturbing source,and the reconstruction accuracy of the former is higher than the latter.

关 键 词：声学 粒子速度重构 非自由声场 近场声全息 P-U探头 

分 类 号：O422.2[理学—声学]