Computational Technology Resources - CCC

Y. Endo¹, Y. Michitsuji², M. Tanimoto³ and O. Imahori⁴

¹Graduate School of Science and Engineering, Ibaraki University, Hitachi, Japan
²College of Engineering, Ibaraki University, Hitachi, Japan
³Engineering Department, Metro Sharyo Co., Ltd., Tokyo, Japan
⁴Rolling Stock Department, Tokyo Metro Co., Ltd., Tokyo, Japan

doi:10.4203/ccc.7.5.10

Y. Endo, Y. Michitsuji, M. Tanimoto, O. Imahori, "Study on the Mechanism of Wheelset Angular Velocity Changing on Curved Tracks", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 5.10, 2024, doi:10.4203/ccc.7.5.10

Keywords: communication-based train control, moving block system, velocity measurement, angular velocity of wheelset, train localization, steering bogie.

Abstract

The change of wheelsets' rotation angular velocity on curved tracks introduces velocity estimation errors, leading to inaccuracies in train positioning for the moving block system utilized by communication-based train control. Therefore, elucidating the mechanism and characteristics of angular velocity changing is crucial for assessing the accuracy of train location estimation. In this study, experiments and multi-body dynamics simulations were conducted to observe angular velocity changes on curved tracks. The experimental results indicates the changes of angular velocity on curved tracks, with the rotation of the front axle of the bogie notably slower than that of the rear axle. Simulation results indicate that the observed physical phenomenon can be replicated, with the relative change in angular velocity differing based on wheel/rail friction coefficient conditions. The mechanism of this variation is discussed in terms of path length differences between wheels, changes in rolling radius, and longitudinal creepages. Consequently, it is concluded that the distinct characteristics of longitudinal creepage depending on conditions are the primary determinant of the differential angular velocity of wheelsets on curved tracks.

download the full-text of this paper (PDF, 1640 Kb)

go to the previous paper
go to the next paper
return to the table of contents
return to the volume description

	Computational & Technology Resources an online resource for computational, engineering & technology publications
	not logged in - login
Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 7 PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 5.10 Study on the Mechanism of Wheelset Angular Velocity Changing on Curved Tracks Y. Endo¹, Y. Michitsuji², M. Tanimoto³ and O. Imahori⁴ ¹Graduate School of Science and Engineering, Ibaraki University, Hitachi, Japan ²College of Engineering, Ibaraki University, Hitachi, Japan ³Engineering Department, Metro Sharyo Co., Ltd., Tokyo, Japan ⁴Rolling Stock Department, Tokyo Metro Co., Ltd., Tokyo, Japan doi:10.4203/ccc.7.5.10 Full Bibliographic Reference for this paper Y. Endo, Y. Michitsuji, M. Tanimoto, O. Imahori, "Study on the Mechanism of Wheelset Angular Velocity Changing on Curved Tracks", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 5.10, 2024, doi:10.4203/ccc.7.5.10 Keywords: communication-based train control, moving block system, velocity measurement, angular velocity of wheelset, train localization, steering bogie. Abstract The change of wheelsets' rotation angular velocity on curved tracks introduces velocity estimation errors, leading to inaccuracies in train positioning for the moving block system utilized by communication-based train control. Therefore, elucidating the mechanism and characteristics of angular velocity changing is crucial for assessing the accuracy of train location estimation. In this study, experiments and multi-body dynamics simulations were conducted to observe angular velocity changes on curved tracks. The experimental results indicates the changes of angular velocity on curved tracks, with the rotation of the front axle of the bogie notably slower than that of the rear axle. Simulation results indicate that the observed physical phenomenon can be replicated, with the relative change in angular velocity differing based on wheel/rail friction coefficient conditions. The mechanism of this variation is discussed in terms of path length differences between wheels, changes in rolling radius, and longitudinal creepages. Consequently, it is concluded that the distinct characteristics of longitudinal creepage depending on conditions are the primary determinant of the differential angular velocity of wheelsets on curved tracks. download the full-text of this paper (PDF, 1640 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
Back to top	©Civil-Comp Limited 2023 - terms & conditions