Numerical Simulation on Required Capacity of MT-2 Vehicle Draft Gear under Shunting Impact Condition

doi:10.3901/JME.2019.14.122

Abstract

Abstract: According to longitudinal load characteristics of vehicle and mechanism of dry frictional draft gear under shunting impact, the dynamic model of shunting impact, the dry frictional draft gear model was built and the impact simulation system of heavy haul trains was developed. The influences of the coupler slack, the numbers of grouped vehicles, the vehicle's weight, the impact speeds and the vehicle's structure stiffness on the required capacity of draft gear are studied. The simulation results show as follows:the most required capacity of draft gear is the draft gear between the impacting and impacted vehicle when the train is shunting. When both the impacting vehicles and impacted vehicles consist of three vehicles respectively, the draft gear reaches the maximum required capacity under the 0 mm coupler slack, and then it is not related to the number of vehicles as the vehicles increasing. The coupler slack has great effect on the required capacity of draft gear, and it decreases nonlinearly with the increase of the coupler slack. The vehicle's weight and the impact speeds of shunting are the main factors affecting the required capacity of draft gear, and it is respectively proportional to the total weight and the square of the impacting velocity of the vehicle. The influence of the vehicle structure stiffness on the required capacity of draft gear is obvious. Considering the influence of the vehicle structure stiffness, the required capacity is 8.8% smaller than when this is not considered. The results show that the influence of various factors should be taken into consideration in the determination of draft gear capacity, and at least meeting the required capacity of draft gear under 0 mm coupler slack and the impacting vehicles and impacted vehicles consist of three vehicles respectively. This work provides theoretical basis for the determination of the draft gear capacity of heavy haul trains and the design of new draft gear capacity.

Key words: draft gear, draft gear capacity, heavy haul trains, longitudinal dynamics, shunting impact

CLC Number:

U270

ZHAO Xubao, WEI Wei, ZHANG Jun, MA Yongfeng. Numerical Simulation on Required Capacity of MT-2 Vehicle Draft Gear under Shunting Impact Condition[J]. Journal of Mechanical Engineering, 2019, 55(14): 122-131.

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