Structural health monitoring of composite patch repairs using two-dimensional wavelet maps

K. Amaravadi, V. Rao, M. M. Derriso

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

The economic constraints on modern day military and commercial air fleets has imposed longer lifecycles and extended environmental exposure on them. Aging aircrafts are more susceptible to damage due to fatigue and environmental corrosion. Adhesively bonded composite patch repairs have been found to be an economic and reliable means of strengthening aging airframes. However, before this technology is adopted by the aircraft industry the long term durability of the composite patch repairs in terms of their structural integrity has to be thoroughly scrutinized. In this paper a structural health monitoring algorithm has been developed that can detect damage in adhesively bonded composite patch repairs using the dynamic response of a structure. The signal-based health monitoring algorithm, wavelet analysis, has been utilized to detect damage using small local variations in the vibration signature of the structure. Specifically, curvature mode shapes, and wavelet maps, are integrated to detect damage at both single and multiple locations. The dynamical characteristics of the test structure are obtained analytically using linear elastic finite element analysis and experimentally with a Laser Doppler Vibrometer. The results obtained are good.

Original languageEnglish
Title of host publicationStructural Health Monitoring 2003
Subtitle of host publicationFrom Diagnostics and Prognostics to Structural Health Management - Proceedings of the 4th International Workshop on Structural Health Monitoring, IWSHM 2003
EditorsFu-Kuo Chang
PublisherDEStech Publications
Pages352-360
Number of pages9
ISBN (Electronic)1932078207, 9781932078206
StatePublished - 2003
Event4th International Workshop on Structural Health Monitoring: From Diagnostics and Prognostics to Structural Health Management, IWSHM 2003 - Stanford, United States
Duration: Sep 15 2003Sep 17 2003

Publication series

NameStructural Health Monitoring 2003: From Diagnostics and Prognostics to Structural Health Management - Proceedings of the 4th International Workshop on Structural Health Monitoring, IWSHM 2003

Conference

Conference4th International Workshop on Structural Health Monitoring: From Diagnostics and Prognostics to Structural Health Management, IWSHM 2003
CountryUnited States
CityStanford
Period09/15/0309/17/03

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  • Cite this

    Amaravadi, K., Rao, V., & Derriso, M. M. (2003). Structural health monitoring of composite patch repairs using two-dimensional wavelet maps. In F-K. Chang (Ed.), Structural Health Monitoring 2003: From Diagnostics and Prognostics to Structural Health Management - Proceedings of the 4th International Workshop on Structural Health Monitoring, IWSHM 2003 (pp. 352-360). (Structural Health Monitoring 2003: From Diagnostics and Prognostics to Structural Health Management - Proceedings of the 4th International Workshop on Structural Health Monitoring, IWSHM 2003). DEStech Publications.