Optimized guided wave excitations for health monitoring of a bolted joint

Timothy R. Fasel; Colin C. Olson; Michael D. Todd

doi:10.1117/12.778527

10 April 2008 Optimized guided wave excitations for health monitoring of a bolted joint

Timothy R. Fasel, Colin C. Olson, Michael D. Todd

Proceedings Volume 6935, Health Monitoring of Structural and Biological Systems 2008; 69351N (2008) https://doi.org/10.1117/12.778527
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

Recent research has shown that chaotic structural excitation and state space reconstruction may be used beneficially in structural health monitoring (SHM) processes. This relationship has been exploited for use in detection of bolt preload reduction by using a chaotic waveform with ultrasonic frequency content with a damage detection algorithm based on auto-regressive (AR) modeling. The signal is actively applied to a structure using a bonded macro fiber composite (MFC) patch. The response generated by the mechanical interaction of the MFC patch with the structure is then measured by other affixed MFC patches. In this study the suitability of particular chaotic waveforms will be investigated through the use of evolutionary algorithms. These algorithms are able to find an optimum excitation for maximum damage state discernability whose fitness is two orders of magnitude greater than choosing random parameters for signal creation.

Citation Download Citation

Timothy R. Fasel, Colin C. Olson, and Michael D. Todd "Optimized guided wave excitations for health monitoring of a bolted joint", Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 69351N (10 April 2008); https://doi.org/10.1117/12.778527

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