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10 April 2007Omnidirectional guided wave PWAS phased array for thin-wall structure damage detection
Widely used 1-D guided wave phased arrays can only scan within 0°~180° range due to the intrinsic structural
limitation. To overcome this limitation, multiple installations are unavoidable. However, by using 2-D
configuration phased arrays, large structural interrogation can be conducted from a single location with a single
scanning covering the entire 0°~360° range through omnidirectional beamforming. Based on the developed
generic PWAS Lamb wave phased array beamforming formula, this paper aims to bring up the practical
implementation of an 8x8 PWAS array and present analytical and experimental results concerning the
omnidirectional damage detection ability.
The theoretical beamforming of 2-D rectangular PWAS configuration will be presented at first based on the
generic PWAS phased array beamforming formulation. Then, an 8x8 rectangular PWAS array is installed on the
target aluminum specimen. Laboratory experiment is set up next and conducted various crack damage detection.
Specimens include: (1) a single crack positioned at 90°; (2) a single crack positioned at 270°; (3) a single hole
positioned at 180°; 4) a crack at 90° and a hole at 180°, respectively. The experiments will demonstrate the 360°
damage finding ability of the 2-D PWAS array and the multiple damage detection ability as well. We finally end
up with discussions on the practical application and come up with plans for future work on various 2-D array
developments.
Lingyu Yu,Victor Giurgiutiu, andJames R. Kendall
"Omnidirectional guided wave PWAS phased array for thin-wall structure damage detection", Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 652939 (10 April 2007); https://doi.org/10.1117/12.717738
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Lingyu Yu, Victor Giurgiutiu, James R. Kendall, "Omnidirectional guided wave PWAS phased array for thin-wall structure damage detection," Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 652939 (10 April 2007); https://doi.org/10.1117/12.717738