单全息面的直接声场分离方法

为了简化分离全息面两侧相干声源的过程,提出仅依据单全息面上的数据直接进行声场分离的方法。该方法通过将等效源配置在球面上,并根据等效源法近场声全息的重构原理,建立全息面上有误差的测量值和计算值之间的数据关系,理论推导出单面声场分离方法。仿真分析干扰声源为脉动球源和受迫振动的简支薄钢板的分离结果,并对双扬声器的声场分离进行了实验验证。结果表明:该方法对两种干扰源都具有较好的分离精度,且有较高的可容忍误差。

Direct sound field separation method on holography surface

In order to simplify the process which is to separate the coherent sources existed in different directions of holography surface, the method of direction sound field separation only depending the data on holography surface is proposed. Assume that the reconstruction surface is holography surface, according to the equivalent sources located at the spherical surface, there exists a relationship based on equivalent source method between the measured sound pressure and calculated value. Then, the coherent sources will be separated. Numerical simulation analyzed the separation result when the interference sources are pulsating ball source and simply supported steel sheet with forced oscillation, respectively. The separation method is validated in experiment with two loudspeakers. The results show that this method has high accuracy to the two kinds of interference sources and has high tolerate deviation.