Dynamics Behaviour of High-speed Train at the Low Temperature of -40℃

doi:10.3901/JME.2019.04.148

Abstract

Abstract: The low temperature has great effect on the vehicle system dynamics of high-speed train, which needs to know the range of variation of suspension parameters in low temperature, but there exists rare researches on the dynamics behaviour of railway vehicle when it bears a quite low temperature of -40℃ or lower. A non-linear dynamics railway vehicle model is built for a high-speed train running in cold climate on the basis of low-temperature dynamics performance tests for its suspension components. The modelling accuracy is validated by comparing the simulated results with the field measurements within the normal temperature. In the numerical simulations, the stochastic characteristics of suspension parameters components, wheel-rail interactions, wheel-rail interfaces are considered as normal distributions. Then the Latin hypercube sampling (LHS) method is applied to design numerical scenarios, and a total of 300 cases is considered during the numerical analysis. It shows that the hunting stability and safety indices still meet the requirements declared in respective criterion at the speed of 300 km/h, while the lateral ride quality under extreme low-temperature case is a bit severe than that under normal temperature case resulting from the lateral sway motion of car body when the vehicle with reprofiled wheels running on tangent tracks. Lab tests and simulations demonstrate that the low-temperature increases the rubber stiffness and dampers' damping significantly and leads to a low damping ratio of the in-phase hunting movements of two bogies, which share a similar frequency with the swaying motion of car body. The swaying movement of car bod has the rotation center higher than the position of center of mass of car body. This contributes a lateral swaying motion of car body, and then attentions shall be paid for the newly reprofiled high-speed vehicles in case of ca body swaying. A reference is provided for the design of suspension parameters and dynamic behavior of high-speed train under the low temperature situation.

Key words: dynamics simulation, extreme low-temperature, field tests, high-speed trains, stochastic parameters

CLC Number:

U270

TENG Wanxiu, LUO Ren, SHI Huailong, ZENG Jing. Dynamics Behaviour of High-speed Train at the Low Temperature of -40℃[J]. Journal of Mechanical Engineering, 2019, 55(4): 148-153.

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