A probabilistic imaging for impact localization method on composite stiffened plate structures is pre-sented in this paper.Impact response signals are received by the sparse array piezoelectric sensor network on the surface of the composite stiffened plate.Complex Morlet wavelet transform is used to extract the narrowband Lamb wave signal of specific center frequency from the impact response signal.The Lamb wave arrival time is obtained according to the maximum modulus value of the narrowband signal.An error function is constructed based on the difference of arrival time and the probability values of each point are calculated as the impact source in the monitoring area.The probability value is used as pixel value for the probabilistic imaging for impact local-ization of the structure.The proposed algorithm is validated on a 700 mm × 450 mm carbon fiber reinforced composite stiffened plate.The experimental results show that the proposed algorithm is simple and effective,the imaging resolution and localization accuracy are high,and the impact localization accuracy is still considerable as using fewer sensors.
维普
万方数据