9 May 2005 Can damage be detected without any baseline data?
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A structural health monitoring system is developed for continuous online monitoring of delamination initiation and growth in composite structures. Structural health monitoring problems are often cast in the context of a statistical pattern recognition paradigm, in which a damage state of the system is inferred by comparing test data with baseline data. However, subtle signal changes due to damage can often be masked by larger ambient variation of the operational and environmental conditions of an in-service structure. Therefore, it is critical for the development of a robust monitoring system to minimize false-positive indications of damage caused by the undesired operational and environmental variation of the system. The issue of minimizing damage misclassification has been addressed in this paper by developing an instantaneous damage detection system that does not rely on any prior baseline data. The development of the proposed instantaneous damage diagnosis system is based on the concepts of time reversal acoustics and consecutive outlier analysis, and the proposed damage diagnosis system has been tested for detecting delamination in composite plates.
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Hoon Sohn and Hyun Woo Park "Can damage be detected without any baseline data?", Proc. SPIE 5768, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems IV, (9 May 2005); doi: 10.1117/12.605374; https://doi.org/10.1117/12.605374

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