Guided wave signal processing and image fusion for in situ damage localization in plates

Analysis of Distributed Sparse Array Configurations for Guided Wave Imaging Applications

“…This paper considers two elliptical imaging algorithms that calculate each pixel value independently, specifically conventional delayand-sum imaging [4,5] and MVDR imaging [6,7]. These imaging algorithms are briefly summarized here to orient the reader.…”

“…All images generated from guided wave imaging algorithms, including conventional delay-and-sum imaging [4,5] and MVDR imaging [6,7], include artifacts that result from energy that has reflected from both structural boundaries and internal scatterers. These imaging artifacts can severely degrade imaging performance and therefore the ability of an array to detect and localize damage.…”

Lamb wave (A0 mode) scattering directionality at defects

“…High frequency guided waves have been employed to monitor fatigue crack growth at fastener holes [3][4][5][6] and to detect defects in multi-layered structures [7]. For plate structures, localized and distributed array systems using lowfrequency guided ultrasonic waves have been developed for the detection of defects [8][9][10][11]. Taking the scattering pattern into account for the signal processing, e.g.…”

Towards Real-Time Structural Health Monitoring Damage Detection Without User Input

“…Thus through analysis of wave features it is possible to detect and localize the damages. Many researchers have demonstrated the effectiveness of the baseline comparison approaches for detection of damage presence [1][2][3]. Delay and sum methods utilize key wave features in diagnostic signals; including time of flight (TOF), velocity and damage scatter, to predict the location of damage.…”