ICMST-Tohoku 2018
Oct. 23 - 26, 2018
Sendai, Japan
ICMST-Shenzhen 2016
Nov 1 - 4, 2016
Shenzhen, China
ICMST-Kobe 2014
Nov 2(Sun) - 5(Wed), 2014
Kobe, Japan
Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
For Public Comment
Outline of New Safety Standard (Design Basis)
For Public Comment
New Safety Standards (SA) Outline (Draft)
For Public Comment
Outline of New Safety Standard(Earthquake and Tsunami)(DRAFT)

Vol.10 No.2(Aug)
Vol.10 No.1(May)
Vol.9 No.4(Feb)
Vol.9 No.3(Nov)

< Other Issues


Occasional Topics
OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
OTjapan The Tragedy of “To Be” Principle in the Japanese Nuclear Industry
EJAMOT_CN3_Figure1_The_outside_view_of_CEFR OTChinaPlanning and Consideration on SFR R&D Activities in China
< All Occasional Topics

Featured Articles
EJAM7-3NT72 A New Mechanical Condition-based Maintenance Technology Using Instrumented Indentation Technique
EJAM7-3NT73 Survey robots for Fukushima Daiichi Nuclear Power Plant

(in English)

EJAM Vol.2 pp.43-49 "Electromagnetic Nondestructive Evaluation Method for Discriminating and Sizing of Defects in Bearings"
Vol.2 No.1 previous GA 13 - AA 15 - SP2 (16 - 17 - 18) - NT 23 - 24 - 25 next Vol.2 No.3
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
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.
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