Localization of Continuous Acoustic Source in Composite Structures Based on the Beamforming Method With Dispersion Wave-Velocity Correction

The detection of continuous acoustic sources on composite structures is an important research direction in the field of structural health monitoring. However, the complexity of continuous acoustic signal and the anisotropy of composite materials lead to the difficulty of location. Therefore, a method of continuous acoustic source location for composite structure based on dispersion wave velocity modified beamforming method is proposed. In this method, an L-shaped sensor array is used to locate the continuous acoustic source with the beamforming algorithm, and the wave velocity-direction curve is constructed by selecting the filter frequency band with the optimal weight and combining the dispersion curves of composite plates in different directions. The noise excitation signal and gas leakage are designed to simulate continuous signals in experiments. The results show that the positioning errors of the two signals are 42.3 mm and 35.6mm on a 1000mm×1000mm×3 mm carbon fiber board. This method can effectively overcome the positioning difficulties caused by anisotropy, and provide an important idea for the health detection of composite structures.