Damage detection in composite plates with embedded PZT transducers

A probabilistic crack size quantification method using in-situ Lamb wave test and Bayesian updating

“…However, a tone burst with more number of cycles results longer duration and lower time resolution [14]. A five cycles sinusoidal tone burst, is usually adopted in SHM applications since it offers a satisfactory trade-off between a good dispersion characteristic and time duration [2,3,20,25,26,33]. For the specimens in this study, the length is only 400 mm but the wavelength of the selected guided wave is relatively large.…”

Structural health monitoring by means of elastic wave propagation

“…The latter group utilized information about direct patch of elastic wave between excitation and receivers. Any changes due to damage within amplitude, velocity, type of mode may be recognized as a material discontinuity [8,9,10].…”

Wavlet-Based Active Sensing for Health Monitoring of Plate Structures using Baseline Free Ultrasonic Guided Wave Signals

“…For circular arrays, phased addition algorithm are often used [25,26] that requires the defect to be in the far-field of the receiver array, so that the reflected wave packets are assumed to come from a particular direction and the signal received at each receiver is shifted appropriately in the wave number domain and added. In contrast, raw time-domain signal data with time of flight and velocity information has been used for damage detection is large plate structures [27]. The STMR array can also be used for detection of plate-stiffener debonding [28].…”