Multiple damage detection on aircraft composite structures using near-field MUSIC algorithm

Damage identification in aircraft composite structures: A case study using various non-destructive testing techniques

“…Such methods are often called in situ NDT or Structural Health Monitoring (SHM) [4,9]. Such an approach was successfully applied by the authors of [6,10]. Another intensively developed technique of inspection of aircraft composite structures is based on acoustic measurements.…”

Lamb waves based fast subwavelength imaging using a DORT-MUSIC algorithm

“…As expected, three significant singular values were found and the signal space dimension was, therefore, determined as three. The zoomin DORT-MUSIC image of the three damage sites is obtained using equation (8) and shown in Fig. 5(b).…”

“…Despite the broad application of the DORT method, the MUSIC algorithm or a combination of these two in various areas, the application to damage imaging using Lamb wave-based on DORT or MUSIC is limited [6][7][8]. Due to the dispersive nature of Lamb waves and the complexity of multi-mode behavior during propagation, the accurate representation of the background Green's function is difficult to attain.…”

Impact energy level assessment of composite structures using MUSIC-ANN approach

“…The orthogonality of the two subspaces can be utilized to estimate the signal parameters. Therefore, similar to the formulas of uniform linear array deduced by the authors [10][11][12], the observed signal vector from the P-B sensor array is analyzed first in this section.…”