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Academic Articles
Regular Paper (Contributed) Vol.2 (2010) p.43 - p.49
 

Electromagnetic Nondestructive Evaluation Method for Discriminating and Sizing of Defects in Bearings
 
Shingo MAWATARI 1,*, Ryo KAYATA2, Stéphane PERRIN 2, and Kazuo YASHIRO1,†
 
1Japan Nuclear Fuel Limited，4-108，Aza Okitsuki，Oaza Obuchi Rokkasho-mura，Kamikita-gun，Aomori-ken 039-3212，Japan
2IIU, 2-7-17-7F Ikenohata, Taito-ku, Tokyo 110-0008, Japan
 
Abstract
In the present paper, a new electromagnetic nondestructive evaluation technique is proposed to detect and size defects on the inner and outer rings of ball bearings. A permanent magnet is used to generate a static magnetic field and the eddy currents induced inside the rotating ball bearing are detected by a coil wrapped around the magnet. A signal processing method that makes use of the autocorrelation is proposed to detect the defects in ball bearings and to evaluate their size. Experimental validations are carried out using common ball bearings. The comparison through the use of the proposed method of healthy bearings with bearings with defects allows detecting, discriminating and sizing the defects, in spite of the presence of a metallic casing.
 
Keywords
electromagnetic nondestructive evaluation, signal processing, ball bearings, eddy currents, autocorrelation.
 
Full Paper: PDF
Article Information
Article history:
Received 25 January 2010
Accepted 2 August 2010