Damage localisation in plate-like structures based on PZT sensors

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Acousto-ultrasonics-based fatigue damage characterization: Linear versus nonlinear signal features (2014, background): “The majority of such techniques are based on exploring changes in the damage-scattered AU waves, which can be documented in time domain signals in the form of amplitude alteration and/or phase deviation (in comparison with baseline signals), typified by the delay in time-of-flight (ToF) [12–16], wav”
Simultaneous identification of moving masses and structural damage (2010, methodology): “Local monitoring methods locate and identify small defects in narrow inspection zones via ultrasonic testing (Staszewski 2003; Ostachowicz et al. 2009) or statistical classification techniques (Silva et al.”
Assessment of delay-and-sum algorithms for damage detection in aluminium and composite plates (2014, background): “Ostachowicz et al (2009) have proposed a damage localization algorithm based on phased array transducers distributed in a ring pattern.”
Guided wave based structural health monitoring: A review (2016, methodology): “The other successful technique is phased array based imaging [163], where, the sensors are placed closer to each other to investigate the area around this array.”