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Proceedings Paper

Omnidirectional guided wave PWAS phased array for thin-wall structure damage detection
Author(s): Lingyu Yu; Victor Giurgiutiu; James R. Kendall
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Paper Abstract

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.

Paper Details

Date Published: 10 April 2007
PDF: 12 pages
Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 652939 (10 April 2007); doi: 10.1117/12.717738
Show Author Affiliations
Lingyu Yu, Univ. of South Carolina (United States)
Victor Giurgiutiu, Univ. of South Carolina (United States)
James R. Kendall, Lockheed Martin Space Systems Co. (United States)


Published in SPIE Proceedings Vol. 6529:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007
Masayoshi Tomizuka; Chung-Bang Yun; Victor Giurgiutiu, Editor(s)

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