TY - GEN
T1 - Imaging of multiple damages in a composite plate by prestack reverse-time migration technique
AU - Wang, L.
AU - Yuan, F. G.
N1 - Publisher Copyright:
Copyright © 2003 by DEStech Publications, Inc. All right reserved.
PY - 2003
Y1 - 2003
N2 - Migration technique, which is widely used in seismic prospecting and geophysical exploration, is applied to detecting and imaging multiple damages in a composite plate. A structural health monitoring system (SHMS) with a linear array of actuators/sensors is proposed. The integrated actuators/sensors are used to excite/receive the lowest mode of flexural waves in the composite laminate. A reverse-time migration technique is then adopted to interpret the scattering wave field and to visualize the damages. The wave field reflected from the damages is synthesized by using a two-dimensional explicit finite difference algorithm to model the plate. An excitation-time imaging condition specifically for the migration of waves in a plate is introduced based on a ray tracing. Then prestack reverse-time migration proceeds to back-propagate the reflection energy to the damages. The plate is imaged in terms of the velocity of transverse deformation, after migration the locations and dimensions of the flaws can be visually displayed. Numerical results show that multiple damages can be successfully identified and the imaged result correlates well with target damages.
AB - Migration technique, which is widely used in seismic prospecting and geophysical exploration, is applied to detecting and imaging multiple damages in a composite plate. A structural health monitoring system (SHMS) with a linear array of actuators/sensors is proposed. The integrated actuators/sensors are used to excite/receive the lowest mode of flexural waves in the composite laminate. A reverse-time migration technique is then adopted to interpret the scattering wave field and to visualize the damages. The wave field reflected from the damages is synthesized by using a two-dimensional explicit finite difference algorithm to model the plate. An excitation-time imaging condition specifically for the migration of waves in a plate is introduced based on a ray tracing. Then prestack reverse-time migration proceeds to back-propagate the reflection energy to the damages. The plate is imaged in terms of the velocity of transverse deformation, after migration the locations and dimensions of the flaws can be visually displayed. Numerical results show that multiple damages can be successfully identified and the imaged result correlates well with target damages.
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M3 - Conference contribution
AN - SCOPUS:84944449732
T3 - Structural Health Monitoring 2003: From Diagnostics and Prognostics to Structural Health Management - Proceedings of the 4th International Workshop on Structural Health Monitoring, IWSHM 2003
SP - 658
EP - 665
BT - Structural Health Monitoring 2003
A2 - Chang, Fu-Kuo
PB - DEStech Publications
T2 - 4th International Workshop on Structural Health Monitoring: From Diagnostics and Prognostics to Structural Health Management, IWSHM 2003
Y2 - 15 September 2003 through 17 September 2003
ER -