Print Email Facebook Twitter Short pitch corrugation mitigation by rail constraint design Title Short pitch corrugation mitigation by rail constraint design Author Zhang, P. (TU Delft Railway Engineering) Li, S. (TU Delft Railway Engineering) Li, Z. (TU Delft Railway Engineering) Date 2023 Abstract Short pitch corrugation is a quasi-periodic rail defect that induces a high level of noise and accelerates track degradation. This paper proposes a methodology to mitigate short pitch corrugation by rail constraint design, including four steps. In Step 1, corrugation is numerically reproduced by employing a three-dimensional (3D) finite element (FE) vehicle-track model with degraded fastenings. In Step 2, the corrugation initiation mechanism is identified by the operating deflection shapes (ODSs) approach. In Step 3, different types of rail constraints are designed and their effects on rail vibration modes are analysed. Then FE models of these rail constraints are built up and validated. In Step 4, rail constraint models from Step 3 are applied to the 3D FE vehicle-track interaction model and their effectiveness on corrugation mitigation is evaluated. The results indicate rail longitudinal compression modes and the induced longitudinal dynamic contact force dominate the initial differential wear and corrugation initiation. Based on this mechanism, a new rail constraint is designed in this work that can completely suppress longitudinal compression modes and significantly reduce the fluctuation amplitude of the longitudinal contact force so that corrugation can hardly initiate. This paper first points out a direction for field corrugation mitigation by strengthening the rail longitudinal constraint. Subject 3D Fe vehicle-track dynamic interaction modelLongitudinal dynamic contact forceOperating deflection shapesRail constraint designRail longitudinal compression modesShort pitch corrugation mitigation To reference this document use: http://resolver.tudelft.nl/uuid:b5a1d36b-7034-4893-9c95-03654a89da37 DOI https://doi.org/10.1016/j.ijmecsci.2022.108037 ISSN 0020-7403 Source International Journal of Mechanical Sciences, 243 Part of collection Institutional Repository Document type journal article Rights © 2023 P. Zhang, S. Li, Z. Li Files PDF 1_s2.0_S0020740322009158_main.pdf 10.33 MB Close viewer /islandora/object/uuid:b5a1d36b-7034-4893-9c95-03654a89da37/datastream/OBJ/view