摘要
球型传声器阵列广泛用于三维空间噪声源定位,其分辨率取决于阵列的尺寸和输入信号的频率,当阵列较小时,不适合对低频噪声源进行定位,此外,为实现实时定位,要求算法的计算过程简单。球谐波束形成算法计算过程简单,但其低频分辨率差,不适合布置在小型阵列上。为使用固定尺寸的小型开口球型阵列对三维空间内的低频噪声源进行定位,并且避免增大计算量,提出一种基于球谐波束形成算法的高分辨率改进算法,该算法首先通过声全息算法对空间声场进行重构,然后将重构声场作为波束形成算法的输入,最后对三维空间进行搜索,实现声源定位。所提算法的声成像图更清晰,分辨率性能指标得到提高,证明重建声场可有效改善球谐波束形成算法的低频分辨率,使其更有利于实际应用。
Spherical microphone arrays are widely used for 3D noise source localization,their resolution depends on the size of the array and the frequency of the input signal.It is not suitable for localizing low frequency noise source when the array is small.In addition,in order to achieve real time localization,the simple algorithm is required.The calculation process of spherical harmonic beamforming algorithm is simple,while its resolution is poor when the input signal is at low frequency,which is not suitable for small array.In order to use a small open spherical array of fixed size to locate low frequency noise source in 3D space and avoid increasing the amount of calculation,this paper proposes an improved high resolution algorithm based on the spherical harmonic beamforming algorithm.The algorithm reconstructs the spatial sound field by using acoustic holography algorithm.Then,the reconstructed sound field is used as the input of the beamforming algorithm.Finally,by searching the 3D space,the sound source localization is realized.The acoustic image of the proposed algorithm is clearer,and the resolution performance index is raised.It is proved that the reconstructed sound field can effectively solve the problem of the low-frequency resolution of the spherical harmonic beamforming algorithm,and make the proposed algorithm more beneficial to practical application.
作者
唐玥
杨志坚
TANG Yue;YANG Zhijian(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,China)
出处
《噪声与振动控制》
CSCD
北大核心
2023年第6期8-15,共8页
Noise and Vibration Control
基金
国家自然科学基金资助项目(52075182)
国家重点研发计划资助项目(2018YFB1702403)。
关键词
声学
低频噪声源定位
球谐域波束形成
近场声全息
模态分解
acoustics
low frequency noise source localization
spherical harmonic beamforming
near-field acoustic holography
modal decomposition
