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11 April 2006 Monitoring structural damage using a wave vibration approach
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A vibration-based monitoring process is proposed that adopts a different viewpoint than modal-based methods currently practiced. In addition to the usual modal characterization, vibrations can also be described as traveling waves, which propagate in a continuous structure and are reflected and transmitted at a structural discontinuity. While modal responses depend on the global properties of the structure, the reflection and transmission characteristics depend only on the local properties of the structural damage. As a result, structural health monitoring based on wave vibration characteristics is more sensitive and reliable. In this paper, the wave based vibration approach is applied in monitoring both a cracked structural element and a cracked structural joint. Numerical examples are presented.
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C. Mei, B. Antar, and E. Wang "Monitoring structural damage using a wave vibration approach", Proc. SPIE 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, 61741P (11 April 2006);

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