Research On Simulation Of Longitudinal Securing Strength Of Railway Freight Under The Impact Condition By27t Axle Railway Vehicle

Railway transportation plays a very important role in national economic development. Whether they are bulk cargoes, or strategic materials, even the daily necessities, are all inseparable from railway transportation. The railway heavy transport is an effective means to improve the capacity of railway freight transport, and it is also a trend in today’s world of railway freight transport development. The successful experience of foreign countries whose heavy transport is developing well suggests that: the measure to improve the axle load of the railway wagon can get a good economic efficiency. Therefore, in recent years our country begins to study and develop the railway common wagons of27t axle load, and has completed the27t axle load wagon’s economic feasibility arguments, critical technology and transport organization researches in the existing lines.In order to ensure the safety and integrity of railway freight transport, there is an essential work before the27t axle load wagons can be really put into actual use, that is do the research on longitudinal reinforcement strength of the railway freight under the impact conditions. At present, the calculation standard for longitudinal reinforcement strength in China’s railway freight is obtained under the impact of60t railway gondola whose total weight is about84t, whether it can be applied to the new27t axle load gondola needs urgent research.Usually our calculation standard for longitudinal reinforcement strength is determined by the actual impact test. However, this article uses the vehicle dynamics software SIMPACK to simulate the longitudinal reinforcement strength of under the impact condition of27t axle load gondola earlier can help us know the variation of railway freight acceleration in advance and provide a reference for the future actual impact test.The buffer is an important part of a railway wagon and can ease the longitudinal impact, whose dynamics model is correct or not can directly affect the accuracy of the impact test simulation. The27t axle load gondola has MT-2buffer and HM-1buffer. First, this article has made the impact test characteristic curves of the two buffers for piecewise linear processing, then imported the treated curves into the nonlinear force element of SIMPACK as an input function and got good results. It verified the correctness of the simulation model.Finally, this article has studied the longitudinal inertia force of railway freight under the impact conditions of different speeds, different buffer types, different total weights of the heavy wagon, and different reinforcement methods, then got the mutative laws of the longitudinal inertia force with the changes of impact speed, buffer type, total weight of the heavy wagon, and reinforcement method, also separately obtained the calculation standards of longitudinal inertial force per unit mass of the freight with the changes of total weight of the heavy wagon under the conditions of rigid and flexible reinforcement. This paper has made a comparison with the original formulas, the result shows that:compared with the formula in Railway Freight Loading Reinforcement Rules, the calculation values of railway freight longitudinal inertia force are significantly greater when the27t axle load railway wagon acts as the impact vehicle, whether it is in rigid or flexible reinforcement condition. Therefore, when the27t axle load wagons are put into use officially in the existing lines, it should follow the new formula to calculate the longitudinal inertial force per unit mass of the freight.