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针对传声器阵列两侧存在相干声源的非自由声场重建问题,提出基于球面谐波函数扩展近场声全息理论的相干声场重建方法。该方法在已知测量面两侧声源几何位置时,使用单层传声器阵列获取测量面处的声压分布,通过最小二乘法获得与目标声源和干扰噪声源响应对应的最优球波函数扩展项数和最优系数向量,结合测点位置的空间坐标进行声波分解,并分别重建出各声源在测量面上的声压分布。为了验证方法的有效性,分别给出了相干噪声源为球形声源和非球形声源的仿真验证,并在全消声室内对双扬声器产生的相干声场的重建进行了实验验证。结果表明:该方法对球形声源和非球形声源干扰下的声场重建都具有较好的效果,球形声源干扰下的重建精度更高。
In order to solve the problem of non-free sound field reconstruction of coherent sources on both sides of the microphone array, a coherent sound field reconstruction method based on the spherical near-field acoustic holography is proposed. The method obtains the sound pressure distribution at the measurement surface by using a single-layer microphone array when the sound source geometrical positions on both sides of the measurement surface are known, and obtains the optimal spherical wave function corresponding to the target sound source and the interference noise source response by the least square method The expansion term and the optimal coefficient vector, and the space coordinates of the measuring point are used to decompose the acoustic wave and to reconstruct the sound pressure distribution of each sound source on the measuring surface respectively. In order to verify the effectiveness of the proposed method, the coherent noise sources are simulated and validated respectively for spherical and non-spherical sound sources. The reconstruction of the coherent sound field generated by the dual loudspeakers in an anechoic chamber is verified by experiments. The results show that this method has a good effect on the reconstruction of sound field under the interference of spherical and non-spherical sound sources, and the reconstruction accuracy under the interference of spherical sound sources is higher.