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A High-Sensitivity MFL Method for Tiny Cracks in Bearing Rings

Lookup NU author(s): Dr Jianbo Wu, Chaoqing Tang, Ali Sunny


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IEEE In order to detect tiny cracks in bearing rings, a high-sensitivity magnetic flux leakage (MFL) method based on magnetic induction head is proposed and investigated in this paper. First, the MFL sensing method based on magnetic induction head is theoretically illustrated. A magnetic core with an open gap is applied to guide leaked magnetic flux into a detection magnetic circuit, where an induction coil is placed to detect the change of the magnetic flux. To obtain an optimal gap width for higher sensitivity, its influence on MFL sensitivity is analyzed by building magnetic circuits. Then, to realize automatic inspection for bearing rings, a U-shape magnetizer is proposed and 3-D numerical simulations are conducted to investigate the signal characteristics of the proposed method and the sensitivity affected by gap width. Furthermore, MFL experiments for bearing rings were performed and it was found that the proposed method has high sensitivity for tiny cracks and when the gap width is approximately equal to the width of the crack, the greatest sensitivity will be obtained. Finally, the automatic MFL testing system for bearing rings is designed and employed in the production line. In-line tests show that the novel MFL system can fulfill the inspection requirement for bearing rings.

Publication metadata

Author(s): Wu J, Yang Y, Li E, Deng Z, Kang Y, Tang C, Sunny AI

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Magnetics

Year: 2018

Volume: 54

Issue: 6

Print publication date: 01/06/2018

Online publication date: 19/03/2018

Acceptance date: 22/02/2018

ISSN (print): 0018-9464

ISSN (electronic): 1941-0069

Publisher: IEEE


DOI: 10.1109/TMAG.2018.2810199


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