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Lookup NU author(s): Dr Bin Gao,
Dr Xiaofeng Li,
Professor Gui Yun TianORCiD
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© 2021 Journal of Mechanical Engineering.In response to the challenge of rail rolling contact fatigue crack detection, a multi-physics eddy current thermography technology under new sensor structures is proposed. Through COMSOL Multiphysics finite element simulation software, the electromagnetic field characteristics of the cylindrical magnetic core structure, the arc-shaped yoke structure and the U-shaped yoke structure are analysed, and the detection effect of fatigue crack under different sensing architectures is studied. According to actual application conditions, the L-shaped yoke and the shuttle-shaped yoke structures are developed based on the U-shaped yoke structure, and the induction excitation source system is integrated and developed. Defect detection experiment of milled rail test blocks in the static state shows that the self-developed system has high detection sensitivity for small defects on the rail surface. It can realize quantitative analysis of 0.5 mm wide defects and identify defects with a minimum width of 0.2 mm on the rail surface. Through the defect detection experiment of disc, the fatigue crack detection under speed effect is studied. The proposed robust low-rank tensor crack decomposition algorithm greatly eliminates the background noise of the original thermal image and improves the defect detection resolution. Finally, the low-speed rail inspection experimental platform is built and integrated to verify effectiveness of complex rolling contact fatigue crack detection on rail treads.
Author(s): Miao L, Gao B, Shi Y, Li H, Li X, Wu T, Zhang X, Tian G
Publication type: Article
Publication status: Published
Journal: Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
Online publication date: 29/11/2021
Acceptance date: 29/11/2021
ISSN (print): 0577-6686
Publisher: Chinese Mechanical Engineering Society
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