Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads
Abstract The meso-dynamical behaviour of a high-speed rail ballast bed with under sleeper pads (USPs) was studied. The geometrically irregular refined discrete element model of the ballast particles was constructed using 3D scanning techniques, and the 3D dynamic model of the rail–sleeper–ballast be...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2023-10-01
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| Series: | Railway Engineering Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s40534-023-00319-z |
| _version_ | 1797276026528595968 |
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| author | Xiong Yang Liuyang Yu Xuejun Wang Zhigang Xu Yu Deng Houxu Li |
| author_facet | Xiong Yang Liuyang Yu Xuejun Wang Zhigang Xu Yu Deng Houxu Li |
| author_sort | Xiong Yang |
| collection | DOAJ |
| description | Abstract The meso-dynamical behaviour of a high-speed rail ballast bed with under sleeper pads (USPs) was studied. The geometrically irregular refined discrete element model of the ballast particles was constructed using 3D scanning techniques, and the 3D dynamic model of the rail–sleeper–ballast bed was constructed using the coupled discrete element method–multi-flexible-body dynamics (DEM–MFBD) approach. We analyse the meso-mechanical dynamics of the ballast bed with USPs under dynamic load on a train and verify the correctness of the model in laboratory tests. It is shown that the deformation of the USPs increases the contact area between the sleeper and the ballast particles, and subsequently the number of contacts between them. As the depth of the granular ballast bed increases, the contact area becomes larger, and the contact force between the ballast particles gradually decreases. Under the action of the elastic USPs, the contact forces between ballast particles are reduced and the overall vibration level of the ballast bed can be reduced. The settlement of the granular ballast bed occurs mainly at the shallow position of the sleeper bottom, and the installation of the elastic USPs can be effective in reducing the stress on the ballast particles and the settlement of the ballast bed. |
| first_indexed | 2024-03-07T15:22:25Z |
| format | Article |
| id | doaj.art-f4570606fcdc41b8bd430d853c9a0a06 |
| institution | Directory Open Access Journal |
| issn | 2662-4745 2662-4753 |
| language | English |
| last_indexed | 2024-03-07T15:22:25Z |
| publishDate | 2023-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Railway Engineering Science |
| spelling | doaj.art-f4570606fcdc41b8bd430d853c9a0a062024-03-05T17:36:05ZengSpringerOpenRailway Engineering Science2662-47452662-47532023-10-0132110712310.1007/s40534-023-00319-zAnalysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper padsXiong Yang0Liuyang Yu1Xuejun Wang2Zhigang Xu3Yu Deng4Houxu Li5Faculty of Mechanical and Electrical Engineering, Kunming University of Science and TechnologyFaculty of Mechanical and Electrical Engineering, Kunming University of Science and TechnologyFaculty of Mechanical and Electrical Engineering, Kunming University of Science and TechnologyFaculty of Mechanical and Electrical Engineering, Kunming University of Science and TechnologyFaculty of Mechanical and Electrical Engineering, Kunming University of Science and TechnologyFaculty of Mechanical and Electrical Engineering, Kunming University of Science and TechnologyAbstract The meso-dynamical behaviour of a high-speed rail ballast bed with under sleeper pads (USPs) was studied. The geometrically irregular refined discrete element model of the ballast particles was constructed using 3D scanning techniques, and the 3D dynamic model of the rail–sleeper–ballast bed was constructed using the coupled discrete element method–multi-flexible-body dynamics (DEM–MFBD) approach. We analyse the meso-mechanical dynamics of the ballast bed with USPs under dynamic load on a train and verify the correctness of the model in laboratory tests. It is shown that the deformation of the USPs increases the contact area between the sleeper and the ballast particles, and subsequently the number of contacts between them. As the depth of the granular ballast bed increases, the contact area becomes larger, and the contact force between the ballast particles gradually decreases. Under the action of the elastic USPs, the contact forces between ballast particles are reduced and the overall vibration level of the ballast bed can be reduced. The settlement of the granular ballast bed occurs mainly at the shallow position of the sleeper bottom, and the installation of the elastic USPs can be effective in reducing the stress on the ballast particles and the settlement of the ballast bed.https://doi.org/10.1007/s40534-023-00319-zUnder sleeper padsBallast bedDiscrete element methodMesoscopic mechanical dynamic characteristics |
| spellingShingle | Xiong Yang Liuyang Yu Xuejun Wang Zhigang Xu Yu Deng Houxu Li Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads Railway Engineering Science Under sleeper pads Ballast bed Discrete element method Mesoscopic mechanical dynamic characteristics |
| title | Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads |
| title_full | Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads |
| title_fullStr | Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads |
| title_full_unstemmed | Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads |
| title_short | Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads |
| title_sort | analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads |
| topic | Under sleeper pads Ballast bed Discrete element method Mesoscopic mechanical dynamic characteristics |
| url | https://doi.org/10.1007/s40534-023-00319-z |
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