基于等效源法对移动声源辐射声场的重建与识别研究

Reconstruction and Recognition of Moving-Source Radiated Sound Field based on Equivalent Source Method

为解决移动噪声源位置识别的问题,利用等效源法声全息技术分析运动声源的噪声辐射,将基于静止声源的等效源理论进行扩展,推导出含有多普勒效应的噪声识别公式,利用接收到的含有多普勒效应的声音信号构造出全息数据来完成全息重建。同时,根据该理论设计出一套测量模型,分析移动等效源法在宽带上的重建性能以及声源运动时间和声源移动速度对重建精度的影响。最后,将其与常规等效源法对比,充分说明了该方法的准确性和有效性。

In order to solve the location identification of mobile noise sources,the equivalent source acoustic holography is used to analyze the noise radiation of moving sound sources.The equivalent source theory based on stationary sound source is extended,the noise identification formula with Doppler Effect derived,and holographic data constructed by using received acoustic signals containing Doppler Effect.Meanwhile,a set of measurement model is designed in accordance with the theory.The reconstruction performance of the moving equivalent-source method on broadband,the effects of sound-source moving time and moving speed on reconstruction accuracy are analyzed.Finally,the comparison with the conventional equivalent source method clearly indicates the accuracy and effectiveness of the proposed method.