Research on multi-frequency data fusion based Lamb wave damage localization

Determination of damage location is an important part of structural health monitoring, and time delay is the key parameter to determine the damage location. A damage localization method based on Morlet wavelet transform and data fusion is put forward to reduce the influence of Lamb wave dispersion on the localization accuracy. Travel time information at several special frequencies is extracted, so the signal arrival time is determined. The distance of damage to sensors is obtained based on weighted processing. Damage localization is determined based on ellipse localization method. Simulation results show that the method can reduce the influence of dispersion effect, improve the accuracy of localization and enhance the system anti-interference ability.