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On-Orbit Assessment of Satellite Structural Properties via Robust Structural Health Monitoring
Final rept. 3 Feb 2009-11 May 2012
ARIZONA STATE UNIV TEMPE
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This project addressed the development of an integrated Structural Health Monitoring SHM system for damage diagnosis, including detection and localization in complex composite structures. Lamb wave based active sensing for damage diagnosis is investigated first. The propagation of Lamb wave in stiffened carbon fiber polymer matrix composite panels is characterized. A two step damage detection and characterization approach, which uses both pulse-echo and pitch-catch active sensing schemes, is presented for the identification of delaminations in the stiffened composite panels. The Matching Pursuit Decomposition MPD algorithm is used for the representation of the sensor signals in the time-frequency domain. The delaminations are detected by identifying the converted Lamb wave modes in the time-frequency domain. The MPD algorithm is further used to assess the delamination location in composite structures. Due to the redundancy of the PZT sensor array, a probabilistic location estimation algorithm is used to estimate the confidence range of the delamination in the composite structures.
APPROVED FOR PUBLIC RELEASE