频域加权陷波多声发射源定位与伪源辨识方法

针对信号处理中的稀疏阵列有时会出现栅瓣和伪峰的现象,进而影响波束形成法在结构损伤定位中应用的问题,提出了基于频域加权波束零陷的未知真实声发射源数量的声发射定位与伪源辨识方法。首先,推导研究了波束零陷思想在二维频域加权波束形成方法中的作用机理;然后,基于频域加权陷波的波束形成方法,提出了在未知真实声发射源数量情况下的伪声发射源的辨识和真实声发射源的定位流程;最后,在存在较多伪声发射源干扰情况下进行了单声发射源和同时多声发射源的定位试验,验证了所提出方法的准确性。研究结果表明,所提出的方法对于推广波束形成法在结构健康监测领域的应用具有价值。

Multi-Acoustic Emission Source Localization and Pseudo-Source Identification Method Based on Frequency-Domain Weighted Beamforming

For the phenomenon that grating lobes and pseudo-peaks sometimes appear in a sparse array in signal processing,which affects the use of the beamforming method for structural damage localization,a pseudo-acoustic emission source identification and localization method based on frequency-domain notch-weighted beamforming is proposed.Firstly,the mechanism of beamforming based on two-dimensional frequency-domain weighted beamforming method is deduced and studied.Then,based on the frequency-domain notch-weighted beamforming method,the process of pseudo-acoustic emission source identification and the real acoustic emission source localization under the condition of the unknown number of sources is proposed.Finally,the accuracy of the method is verified in the interference of multiple pseudo-acoustic emission sources.The proposed method has application value in structural health monitoring.