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8 April 2010 Guided waves for SHM of a large truss structure
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This paper describes a method based on Ultrasonic Guided Waves (UGWs) for the detection of cracks in sign support structures. The method combines the advantages of UGWs with the extraction of defect-sensitive features aimed at performing a multivariate diagnosis of damage. The general frame work presented in this paper is applied to ultrasonic data collected from a dimantled overhead sign support structure tested at the University of Pittsburgh. The probing hardware consists of a National Instruments-PXI platform that controls the generation and detection of the ultrasonic signals by means of the piezoelectric transducers made of Lead Zirconate Titanate. The effectiveness of the proposed approach to diagnose the presence of defects as small as a few percent of the waveguide cross-sectional are is demonstrated.
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Xuan Peter Zhu, Piervincenzo Rizzo, and Jerry Bruck "Guided waves for SHM of a large truss structure", Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76500O (8 April 2010);

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