| Vigorously develop the railway freight transport technologies, dramatically improve the weight of freight trains transport is an effective way for railway expansion efficiency However, due to the quality and the axle load have significantly increased, leading to the traction force and braking force,the train required,exponentially increased. With the opening run of20000t heavy haul train on Datong-Qinhuangdao railway line, the train length was increased rapidly,and the braking wave propagation time was extended, the train is very likely to present a spatial distribution on the railway, therefore, the forces of heavy haul train is very complicated, the impulse between vehicles is more intense,then the hook broken, derailment and goods and equipment damaged have occurred frequently, these problems have a very seriously affect on the traffic safety of heavy haul trains, so,the comprehensive study on dynamics performance of long and heavy haul train is becoming very necessary.In this paper, a three-dimensional coupled dynamics software.which utilized Modular Method based on Cycle-Variable,was used to set up heavy haul train dynamics simulation model, resolved the problems of’freedom explosion’and difficult to calculate and processing, appeared on traditional research on dynamics of heavy haul train, breaked the limitation of the traditional study on train dynamics focused on the longitudinal dynamics, eliminated the errors caused by the commonly velocity spread air braking characteristics,combined with heavy haul train operationand simulation system,based on the air flow theory,the three-dimensional coupled dynamic performance of heavy haul train,included longitudinal,horizontal and vertical,has been researched systematically.The main work of the paper are as follows:(1)Analysis of the impact on the longitudinal impulse with different locomotive marshalling in heavy haul train;(2)Analysis of the impact on braking performance of the train with controllable tail devices;(3)Analysis of the impact on longitudinal dynamics performance of the train with different numbers of closed car and different hanging positions;(4)Analysis of performance of curve passing with different combinations of coupler and drawing bar;(5)Analysis of the safety performance of train with various types of coupler buffer;(6)Analysis of the dynamic performance of the train on the curve, including the impact on dynamic performance of the train with and the circular curve radius;(7)Analysis of the dynamic performance of the train on the ramp, including the impact on dynamic performance of the train with different initial velocity and traction braking stalls. |
