Localization of a damage in an Aluminium plate using Lamb wave based ultrasonic testing and Genetic algorithm

In the present work, damage localization is carried out in an Aluminium plate utilizing Lamb waves and Genetic Algorithm (GA). The Piezoelectric Wafer (PW) transducer is utilized for actuating and sensing of Lamb waves. The experiments are carried out using fundamental symmetric mode (S0) of Lamb wave at a peak frequency of 290 kHz. Continuous wavelet transform (CWT) is used to obtain the time of flight (TOF) of the wave packet reflected from the damage. The GA utilizes TOF measurements from four PW sensors to locate the damage. The suggested methodology utilizes the intersection of four TOF circles to conclude the damage location. The damage is located with an accuracy of more than 98%.