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Vol.1 No.2 ← GA 6 - 7 - AA 8 - 9 - NT 10 - 11- 12 - 13Vol.1 No.3
Academic Articles
(Contributed Paper) Vol.1 (2009) p.83 - p.86
 
Electromagnetic Nondestructive Evaluation of Rotating Blades
 
Daigo KOSAKA1, Haoyu HUANG2, Noritaka YUSA3, and Kenzo MIYA2
 
1 Polytecnic University 4-1-1, Hashimotodai, Sagamihara, Kanagawa 229-1196, Japan
2 IIU Corp. 2-7-17, Ikenohata, Taito, Tokyo 110-0008, Japan
3 Department of Nuclear Engineering and Management, Graduate School of Engineering The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo, 113-8656 Japan
 
Abstract
This study proposes a method to nondestructively detect and evaluate tiny defects appearing at the tip of a rotating blade. The method utilizes a permanent magnet to generate a static magnetic field and detects the eddy currents induced by the blade moving inside the magnetic field. The eddy current is detected by the coil of the sensor. Experimental validations are carried out using a commercial pump. Artificial slits fabricated into the impeller were well detected in spite of the presence of a metallic case and a large lift-off.
 
Keywords
rotary machine, pumps,electromagnetic field, vibration
 
Full Text: PDF
 
(Received: July 12th, 2008)