This paper proposes a novel localization method of simultaneous two acoustic emission (AE) sources to decouple the two coupled AE waves in the structure and obtain more accurate localization results by means of frequency-domain notch-weighted beamforming. Firstly, the notch-wave theory is analyzed and combined with propagation characteristics of AE waves to derive the mechanism and method of the frequency-domain notch-weighted beamforming. After that, the localization process of the simultaneous two AE sources is proposed based on the presented frequency-domain notch-weighted beamforming method. Then, the simulation is performed to obtain the data of two AE sources emitted in different positions with different energies to study the localizing effect of the frequency-domain notch-weighted beamforming method. Finally, the proposed method is verified by pencil-lead-breaking (PLB) test on a steel plate. The research results show that the frequency-domain notch-weighted beamforming method can effectively localize the simultaneous two AE sources.

本文提出了一种同时定位两个声发射源的新定位方法，以解耦结构中的两个耦合声波，并通过频域陷波加权波束形成获得更准确的定位结果。首先，对陷波理论进行了分析，并结合声波的传播特性，推导了频域陷波加权波束形成的机理和方法。然后，基于提出的频域陷波加权波束形成方法，提出了同时两个声源的定位方法。然后，进行仿真以获得在不同位置以不同能量发射的两个声发射源的数据，以研究频​​域陷波加权波束形成方法的定位效果。最后，通过在钢板上的铅笔芯折断（PLB）试验验证了该方法的有效性。研究结果表明，频域陷波加权波束形成方法可以有效地定位两个同时声源。