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학술저널
저자정보
Lu, Ye (State Key Laboratory of Mechanical System and Vibration, hanghai Jiao Tong University) Ye, Lin (Laboratory of Smart Materials and Structures [LSMS], Centre for Advanced Materials Technology [CAMT], School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney) Wang, Dong (Laboratory of Smart Materials and Structures [LSMS], Centre for Advanced Materials Technology [CAMT], School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney) Zhou, Limin (Department of Mechanical Engineering, The Hong Kong Polytechnic University) Cheng, Li (Department of Mechanical Engineering, The Hong Kong Polytechnic University)
저널정보
테크노프레스 Smart structures and systems Smart structures and systems 제6권 제7호
발행연도
2010.1
수록면
835 - 849 (15page)

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This study investigated propagation characteristics of piezo-activated guided waves in an aluminium rectangular-section tube for the purpose of damage identification. Changes in propagating velocity and amplitude of the first wave packet in acquired signals were observed in the frequency range from 50 to 250 kHz. The difference in guided wave propagation between rectangular- and circular-section tubes was examined using finite element simulation, demonstrating a great challenge in interpretation of guided wave signals in rectangular-section tubes. An active sensor network, consisting of nine PZT elements bonded on different surfaces of the tube, was configured to collect the wave signals scattered from through-thickness holes of different diameters. It was found that guided waves were capable of propagating across the sharp tube curvatures while retaining sensitivity to damage, even that not located on the surfaces where actuators/sensors were attached. Signal correlation between the intact and damaged structures was evaluated with the assistance of a concept of digital damage fingerprints (DDFs). The probability of the presence of damage on the unfolded tube surface was thus obtained, by which means the position of damage was identified with good accuracy.

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