基于统计最优和波叠加的联合局部近场声全息

提出了一种基于统计最优近场声全息和波叠加法的联合局部近场声全息技术。首先利用两次统计最优近场声全息的声源定位结果来指导配置等效源,其后利用波叠加法进行局部声场重构。该技术适合于中低频声场的局部重建,计算快速,重建精度高;可以在测量数据有缺失的情况下重建声场。进行了脉动球声源模型的数值仿真,并在半消声室内对电机噪声源进行了实验,仿真实验都准确地重构了声源所辐射的外部声场。该技术可以重建任意类球形声源辐射的声场。 

Joint patch near-field holography based on the statistically optimal near-field acoustical holography and the wave superposition method

A method named Joint Patch Near-field Holography(JPNAH) is proposed based on the statistically optimal near-field acoustical holography and the wave superposition method.The basic idea is that the fictitious sources' location essential to the wave superposition method can be decided by the statistically optimal near-field acoustical holography, and then complex sound field will reconstructed by the wave superposition method with high efficiency and precision. Besides the reconstruction of the patch sound field,the JPNAH has many other virtues.First,compared with the NAH, the JPNAH performs better in the low frequency range.Second,using the JPNAH,it is possible to achieve a real-time mapping of the complex sound field.Numerical simulations were performed based on a single-pulse-ball model;and also motor experiments were carried out in a semi-anechoic chamber.The results of numerical simulations and experiments show that the exterior sound field of the radiators can be reconstructed accurately by JPNAH.The results also show that the JPNAH can be used to reconstruct the sound field radiated from a complex sound source.