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Inspection method of cable-stayed bridge using magnetic flux leakage detection: principle, sensor design, and signal processing

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Abstract

A nondestructive testing technique based on magnetic flux leakage is presented to inspect automatically the stay cables with large diameters of a cable-stayed bridge. Using the proposed inspection method, an online nondestructive testing (NDT) modular sensor is developed. The wreath-like sensor is composed of several sensor units that embrace the cable at equal angles. Each sensor unit consists of two permanent magnets and a hall sensor to detect the magnetic flux density. The modular sensor can be installed conveniently on cables with various diameters by increasing the number of sensor units and adjusting the relative distances between adjacent sensor units. Results of the experiments performed on a man-made cable with faults prove that the proposed sensor can inspect the status signals of the inner wires of the cables. To filter the interfering signals, three processing algorithms are discussed, including the moving average method, improved detrending algorithm, and signal processing based on a digital filter. Results show that the developed NDT sensor carried by a cable inspection robot can move along the cable and monitor the state of the stay cables.

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Authors and Affiliations

  1. School of Mechanical Engineering, Southeast University, Nanjing, 211189, China

    Fengyu Xu & Xingsong Wang

  2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Hongtao Wu

Authors
  1. Fengyu Xu
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  2. Xingsong Wang
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  3. Hongtao Wu
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Corresponding author

Correspondence to Xingsong Wang.

Additional information

This paper was recommended for publication in revised form by Associate Editor Enug-Soo Shin

Fengyu Xu received his M.S. degree from Hefei University of Technology in 2005 and the Ph.D. degree from Southeast University in 2009. He had joined the faculty of the College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics. His current research interests include robotics and nondestructive examination.

Xingsong Wang received his B.S. and M.S. degrees from Zhejiang University, Hangzhou, China, in 1988 and 1991, respectively, and his Ph.D. from Southeast University, Nanjing, China, in 2000, all in mechanical engineering. Dr. Wang was a professor with the Department of Mechanical Engineering at Southeast University. His current research interests include control theory, robotics and mechatronic system design.

Hongtao Wu received his B.S. degree from Northeast Heavy Machinery Institute in 1982, the M.S and the Ph.D. degree from Tianjin University in 1985 and 1992, respectively. He joined the faculty of the College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics in 1994. His current research interests include robotics and mechatronic system design, Mechanical multi-body system theory and application, and parallel robot.

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Xu, F., Wang, X. & Wu, H. Inspection method of cable-stayed bridge using magnetic flux leakage detection: principle, sensor design, and signal processing. J Mech Sci Technol 26, 661–669 (2012). https://doi.org/10.1007/s12206-011-1234-x

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  • DOI: https://doi.org/10.1007/s12206-011-1234-x

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