Abstract
Due to the merits of high inspection speed and long detecting distance, Ultrasonic Guided Wave(UGW) method has been commonly applied to the on-line maintenance of power transmission line. However, the guided wave propagation in this structure is very complicated, leading to the unfavorable defect localization accuracy. Aiming at this situation, a high precision UGW technique for inspection of local surface defect in power transmission line is proposed. The technique is realized by adopting a novel segmental piezoelectric ring transducer and transducer mounting scheme, combining with the comprehensive characterization of wave propagation and circumferential defect positioning with multiple piezoelectric elements. Firstly, the propagation path of guided waves in the multi-wires of transmission line under the proposed technique condition is investigated experimentally. Next, the wave velocities are calculated by dispersion curves and experiment test respectively, and from comparing of the two results, the guided wave mode propagated in transmission line is confirmed to be F(1,1) mode. Finally, the axial and circumferential positioning of local defective wires in transmission line are both achieved, by using multiple piezoelectric elements to surround the stands and send elastic waves into every single wire. The proposed research can play a role of guiding the development of highly effective UGW method and detecting system for multi-wire transmission line.
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Supported by National Natural Science Foundation of China(Grant No. 51605229), Natural Science Foundation of Higher Education Institutions of Jiangsu Province, China(Grant No. 16KJB460016), the “333” Project of Jiangsu Province, China(Grant No. BRA2015310), and China Postdoctoral Science Foundation(Grant No. 2016M601844)
CHENG Jun, born in 1986, is currently a lecturer at School of Electrical and Automation Engineering, Nanjing Normal University, China. He received his PhD degree from Nanjing University of Aeronautics and Astronautics, China, in 2015. His research interests include electromagnetic nondestructive testing of CFRP materials and structural health monitoring.
QIU Jinhao, born in 1963, is currently a professor and a deputy director of State Key Laboratory of Mechanics and Control for Mechanical Structures, Nanjing University of Aeronautics and Astronautics, China. He received his PhD degree from Institute of Fluid Science, Tohoku University, Japan, in 1996. His research interests are smart materials and structures, including development of piezoelectric materials and devices, vibration and noise control, structural health monitoring and adaptive structures for aerospace applications.
JI Hongli, born in 1983, is currently an associate professor at State Key Laboratory of Mechanics and Control for Mechanical Structures, Nanjing University of Aeronautics and Astronautics, China. She received her PhD degree from Nanjing University of Aeronautics and Astronautics, China, in 2012. Her research interests include vibration and noise control of piezoelectric smart structures and structural health monitoring.
WANG Enrong, born in 1962, is currently a professor and the dean of School of Electric and Automation Engineering, Nanjing Normal University, China. He received his PhD degree from Concordia University, Canada, in 2006. His research interests include the semi-active control for implementing intelligent vehicle suspension with MR dampers, and the related subjects in fields of electrical engineering and automation.
TAKAGI Toshiyuki, born in 1954, is currently a professor and a deputy director of Institute of Fluid Science, Tohoku University, Japan. He received his PhD degree from University of Tokyo, Japan, in 1982. His research interests include nondestructive evaluation of materials using electromagnetic phenomena, diamond and diamond-like carbon coatings and their application, and adaptive structural systems using shape memory alloys.
UCHIMOTO Tetsuya, born in 1970, is an associate professor at Institute of Fluid Science, Tohoku University, Japan. He received his PhD degree from University of Tokyo, Japan, in 1998. His research interests include evaluation of degradation of structural materials by electromagnetic nondestructive evaluation, material characterization of cast irons by eddy current testing, and novel sensor development.
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Cheng, J., Qiu, J., Ji, H. et al. High precision ultrasonic guided wave technique for inspection of power transmission line. Chin. J. Mech. Eng. 30, 170–179 (2017). https://doi.org/10.3901/CJME.2016.1019.122
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DOI: https://doi.org/10.3901/CJME.2016.1019.122