Research on the influence of quantity of 20 000-ton heavy-haul train wagons on longitudinal impulse
This paper analyzed the effect of train quantity on the train longitudinal impulse experienced,by establishing a longitu-dinal dynamics simulation model of the 20 000-ton heavy-haul trains on the theory of longitudinal dynamics and offers recommendations for mixed marshaling of long and short consists.Moreover,this study included calculations on delays in air braking application and re-lease,as well as the maximum coupler force in cycle braking conditions under three scenarios:synchronous reduction of front and rear wagons,reduction of only front wagons,and reduction of only rear wagons.The latter two scenarios represent mixed marshaling of long and short consists.The results reveal the following findings for 20 000-ton heavy-haul trains in a"1+1+controllable train tail"formation.Synchronous reduction in front and rear wagons effectively mitigates release delay and maximum coupler force during the release pro-cess.Reduction of only front wagons results in a small change in the maximum release delay and fails to sufficiently reduce longitudinal impulse.Conversely,reduction of only rear wagons considerably diminishes the maximum release delay and significantly mitigates longi-tudinal impulse.These findings offer valuable guidance for optimizing heavy-haul train formations.Therefore,for mixed marshaling of both long and short consists,coupling a short consist at the rear of a long one is an effective solution to reduce longitudinal impulse dur-ing train operation.
万方数据
维普
