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B. Hou, J.-D. Qin, J. Pombo, C.-Z. Ma, "Research on Wheel-rail Adhesion Characteristics of High-speed Railway on Long Ramp", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 7.10, 2022, doi:10.4203/ccc.1.7.10

Keywords: high-speed railway, long slope, adhesion characteristics, traction.

Abstract

In this paper, based on multi-body dynamics, a vehicle-track coupled dynamic model considering long ramp is established, and the rail surface friction is set to 0.1 and 0.3 to simulate the low-adhesion rail surface and normal-adhesion rail surface respectively. The variation laws of train running acceleration, wheel-rail contact spot adhesion area and creep rate are studied when the high-speed train is running at the initial speed of 300km/h on different rail surfaces. The results show that the train running acceleration and the creep rate increase with the increase of the traction coefficient, and the adhesion area of the wheel-rail contact spot decreases with the increase of the traction coefficient; when the traction coefficient is 0.15, the traction force provided by the train during the uphill process can just offset the gravity component of the train, showing a constant speed running state; under the low adhesion rail surface, when the traction coefficient exceeds 0.25, the creep rate increases sharply during operation, the wheel-rail contact spot becomes full sliding, and the wheels will slip, which may cause the rail surface squat. The research results of this paper can provide a theoretical basis for the formation of rail squat in high-speed railway.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 1 PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 7.10 Research on Wheel-rail Adhesion Characteristics of High-speed Railway on Long Ramp B. Hou¹, J.-D. Qin¹, J. Pombo² and C.-Z. Ma¹ ¹School of Civil Engineering, Beijing Jiaotong University, China ²Institute of Railway Research, University of Huddersfield, United Kingdom doi:10.4203/ccc.1.7.10 Full Bibliographic Reference for this paper B. Hou, J.-D. Qin, J. Pombo, C.-Z. Ma, "Research on Wheel-rail Adhesion Characteristics of High-speed Railway on Long Ramp", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 7.10, 2022, doi:10.4203/ccc.1.7.10 Keywords: high-speed railway, long slope, adhesion characteristics, traction. Abstract In this paper, based on multi-body dynamics, a vehicle-track coupled dynamic model considering long ramp is established, and the rail surface friction is set to 0.1 and 0.3 to simulate the low-adhesion rail surface and normal-adhesion rail surface respectively. The variation laws of train running acceleration, wheel-rail contact spot adhesion area and creep rate are studied when the high-speed train is running at the initial speed of 300km/h on different rail surfaces. The results show that the train running acceleration and the creep rate increase with the increase of the traction coefficient, and the adhesion area of the wheel-rail contact spot decreases with the increase of the traction coefficient; when the traction coefficient is 0.15, the traction force provided by the train during the uphill process can just offset the gravity component of the train, showing a constant speed running state; under the low adhesion rail surface, when the traction coefficient exceeds 0.25, the creep rate increases sharply during operation, the wheel-rail contact spot becomes full sliding, and the wheels will slip, which may cause the rail surface squat. The research results of this paper can provide a theoretical basis for the formation of rail squat in high-speed railway. download the full-text of this paper (PDF, 7 pages, 888 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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