Paper Title:

Magnetic Flux Leakage Sensing-Based Steel Cable NDE Technique Incorporated on a Cable Climbing Robot for Bridge Structures

Periodical Advances in Science and Technology (Volume 83)
Main Theme Embodying Intelligence in Structures and Integrated Systems
Chapter Chapter 4: Structural Health Monitoring and Control
Edited by Pietro Vincenzini, Fabio Casciati and Piervincenzo Rizzo
Pages 217-222
DOI 10.4028/
Citation Seung Hee Park et al., 2012, Advances in Science and Technology, 83, 217
Online since September 2012
Authors Seung Hee Park, Ju Won Kim, Min Jun Nam, Jong Jae Lee
Keywords Cable Climbing Robot, Local Fault, Magnetic Flux Leakage (MFL), Steel Cable, Visualization
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In this study, an automated cable monitoring system using a NDE technique and a cable climbing robot is proposed. MFL (Magnetic Flux Leakage- based inspection system was applied to monitor the condition of cables. This inspection system measures magnetic flux to detect the local faults (LF) of steel cable. To verify the feasibility of the proposed damage detection technique, an 8-channel MFL sensor head prototype was designed and fabricated. A steel cable bunch specimen with several types of damage was fabricated and scanned by the MFL sensor head to measure the magnetic flux density of the specimen. To interpret the condition of the steel cable, magnetic flux signals were used to determine the locations of the flaws and the level of damage. Measured signals from the damaged specimen were compared with thresholds set for objective decision making. In addition, the measured magnetic flux signal was visualized into a 3D MFL map for convenient cable monitoring. Finally, the results were compared with information on actual inflicted damages to confirm the accuracy and effectiveness of the proposed cable monitoring method.