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CSME 2021/02
Volume 42 No.1
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11-22
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Derailment Risk Analysis for Railway Vehicles Subjected to Wind Loads
Yung-Chang Chenga, Chern-Hwa Chenb and Chung-Wei Yehc
aDepartment of Mechanical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan 9182.
bDepartment of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung, Taiwan 91811.
cDepartment of Aircraft Engineering, Air Force Institute of Technology, Kaohsiung, Taiwan 91820.
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Abstract:
Based on the heuristic nonlinear creep model, this paper presents the nonlinear differential equations of motion for a railway vehicle model running on curved tracks under two-direction rail irregularities and various cross-wind loads. A 31-degree-of-freedom (31-DOF) vehicle model is constructed by including the lateral, vertical, roll and yaw motions for each wheelset and the lateral, vertical, roll, pitch and yaw motions for the bogie frames and the car body. According to the derailment criterion, the derailment quotients, offload factors and overturn factors for a railway vehicle are determined, respectively. From the numerical results, it shows that the derailment quotients, offload factors and overturn factors increase as the angle of attack of wind load increases. The derailment quotients, offload factors and overturn factors for a vehicle model is presented in terms of linear and nonlinear creep models. In general, when cross-wind loads are considered to act on the car body, the derailment quotients, offload factors and overturn factors that are determined by the nonlinear creep model are consistently higher than those evaluated from the linear creep model. As a result, the angle of attack of the wind load has a significant effect on the derailment safety assessment for a railway vehicle system.
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Keywords: heuristic nonlinear creep model, rail irregularity, wind loads, derailment quotient, offload factor, overturn factor.
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©
2021
CSME , ISSN 0257-9731
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