中文摘要：

为了提高非规则结构表面多声源声场的全息精度,提出基于目标深度识别与球面波叠加逼近的非规则表面多声源近场声全息方法。该方法使用声源空间深度识别理论,确定结构体上各声源的空间位置,在各声源处分别使用球面波的叠加描述空间声场分布,然后结合现有单原点球面波叠加近场声全息法重构声场。为了验证方法的可行性,首先使用所述方法和现有单原点球面波叠加声全息法,分别对径向脉动球与横向振动球组成的不同声场进行全息重构。结果表明,当声源集聚分布时,所述方法与现有方法均能有效全息重构声压分布,重构误差在5%以下;当声源离散分布时,现有方法失效,所述方法能够较准确地给出重构面的声压分布,主要频段内的全息重构误差小于20%。进一步的对比实验表明,在全息重构多扬声器非规则空间分布声场时,使用所述全息方法的重构误差平均下降14.08%,显著提升了多声源非规则空间分布声场的全息精度。

英文摘要：

In order to improve the holography accuracy of multiple sources on irregular structure surface, a Near-field Acoustic Holography for multiple sources on irregular structure surface is presented based on spherical harmonic wave superposition and sound source identification. The positions of the sound sources are determined by the theory of sound source depth identification and localization, the 3D sound field distributions are described by spherical harmonic wave superposition from different sound sources location. Then the sound fields are reconstructed by the existing theory of spherical harmonic wave superposition from the same point. The methodology is validated and the accuracy of acoustic field reconstruction is examined numerically in the crowded sound field and the discrete sound field, respectively, and it is compared with the existing method which depict sound field with spherical waves from one local coordinate origin. The results show that when the sound sources are crowded together, the results of sound field reconstruction by the two methods are all satisfied and the reconstruction error is less than 5% . When the sound sources are discrete, the resuh of the existing method is failed, but the proposed method can generate sound pressure distribution precisely, and the reconstruction error is almost less than 20%. Further comparative experiments are carried out with three loudspeakers in anechoic box, the results show that the reconstruction error can be reduced by 14.08% averagely, and the holography accuracy of the multiple sources in irregular spatial position is improved significantly.