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- Title
基于广义柔度曲率信息熵的板式轨道脱空损伤识别.
- Authors
刘 渝; 赵坪锐; 徐天赐; 刘卫星; 姚 力
- Abstract
The filling layer of the slab track, as the key track structure, suffers cavity under the combined effects of frequent train loads and environment, which results in the change of the stiffness at the void part. In order to effectively detect the void of slab track, the modal information of ballastless track is obtained by numerical simulation analysis, and the local peak value of generalized flexibility curvature in the void area is used to identify the void damage. Combined with generalized flexibility, uniform load surface (ULS), curvature and local information entropy, the ULS curvature information entropy that can locate damage is proposed and verified on CRTS III slab track. The results suggest that the generalized flexibility curvature uses the modal information before and after the track void to calculate the curvature difference of the track void damage, which can effectively locate the void position. The characterization value of ULS curvature information entropy only needs the first-order track modal information to not only reflect effectively the position and area of track void, but also overcome the deficiency of healthy modal information required for generalized flexibility curvature. The ULS curvature information entropy values are no differences when the cavity coverage at the symmetrical position of the orbit is the same; ULS curvature information entropy is positively correlated with void area and thickness. The characterization value of ULS curvature information entropy has good damage identification sensitivity, which can identify the small area void of 0. 1 m×0. 1 m less than the layout area of a single measuring point, and the sensitivity of void identification at the edge of track slab is higher than that in the middle of track slab.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 4, p48
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202209100001