Probability Imaging for Defects Using Predicted Lamb Wave Reference Signal
To address the problem that Lamb wave defect probability imaging requires obtaining a reference signal from a non-destructive structures with the same material characteristics,a probability imaging method based on reference signal theoretical prediction was proposed to achieve Lamb wave defect localization.This method combines the initial sig-nal with the dispersion characteristics of Lamb waves,and calculates the reference signal on the probability imaging path based on the fitted amplitude attenuation.The defect characterization index was defined based on the Hilbert spectrum of the calculated reference signal and the corresponding response signal on the path.Combining it with the Lamb wave ellipti-cal probability imaging method achieved defect localization.The experimental results of this method for single-and double-defect imaging localization show that the method can obtain probability images of defects,and the absolute error for defect localization is less than 7.07 mm.This method solves the problem of measuring Lamb wave reference signals and can accu-rately locate defects,with good practicality.
probability imagingLamb wavenondestructive testingdefectdamagedispersionHilbert spectrum
万方数据
维普
