基于AMEsim的公铁两用牵引车液压系统的仿真与改进
Simulation and improvement of hydraulic system of road-railway tractor based on AMEsim

基于我国对外贸易的增长和大陆桥多式联运的发展，传统的单功能公路、铁路牵引车已经难以满足铁路系统高效维护的需求。提出一种改进的公铁两用牵引车液压系统，在原有的研究基础上通过添加叠加式双向缓冲阀，进一步提升系统稳定性；引入行走轮可升降功能，使得牵引车能够适应各种路况。利用AMEsim对改进前后的液压系统进行仿真。研究结果表明：改进后的液压系统较原系统波动性更小，稳定性更高，运作执行时间更符合实际要求，且左右两轮在下降以及上升过程中在同一时刻位移差分别不超过1.1 mm和1.4 mm，同步性较强。故改进后的公铁两用牵引车液压系统应用范围更广，稳定性高，液压工作时间适宜，两侧轮同步性好，能更好地应用于实际工程。
With the growth of China’s foreign trade and the development of continental bridge multimodal transport, the traditional single-function highway, railway tractor has been gradually no longer meet the demand of high efficiency maintenance of railway system. In this paper, an improved hydraulic system of the road-railway tractor is proposed. On the basis of the previous research, the system stability is further improved by adding a superimposed bidirectional buffer valve, and this paper put forward the function that walking wheel can be lifted, which makes the tractor can adapt to all roads. Simulation software AMEsim is used to simulate the improved and former hydraulic system, and the experimental results show that the improved hydraulic system is less dynamic and more stable than the original system, and the operation time is more in line with the actual requirements. The displacement difference between the left and right wheel is less than 1.1 mm and 1.4 mm at the same time. Therefore, the improved road-railway tractor hydraulic system has a wider range of applications, with high stability and suitable hydraulic working time, both sides of the wheel synchronization are good as well, making the tractor be better applied to the actual project