采用回退法、迭算法优化牵引计算周期制动工况

当列车运行在长大下坡道上,通常采用空气制动的周期制动调整速度。为了满足两次空气制动间充风时间和列车空走时间的要求,常常会造成列车的出坡速度与下一坡段的限制速度速差不合理。针对长大下坡道上空气制动工况优化问题,采用工况初选策略自动计算到换坡点,然后进行进出坡检验。若列车的出坡速度不合理则采用不同的策略回退到回退基点,舍掉回退基点后的结果,将其前的结果作为计算的当前解,以此产生一个更优的新解,不断重复该过程直到出坡速度合理时停止迭代。最后得到的工况组合是优化的。

Optimization of Periodic Braking Operations in Train Traction Calculation by Backing-off Model and Iterative Method

Periodic air-brake braking is generally adopted to adjust the train speeds on a long heavy down grade.The difference between the speed at the end of the grade and the limiting speed of the next grade is frequently made unreasonable to meet the requriements of the train non-braking time and charging time during the interval between two times of air-braking.In view of optimization of periodic air-braking on the long down grade,automatic traction calculation is carried out till the breaking point in grade by the initial choice of operating states and the inbound and outbound operations of the train are checked.If the train speed at the end of the grade is not reasonable on checking,different backing-off strategies are employed to untread to the basic spot.The result after untreading to the basic spot is abandoned,and the result before the basic spot is taken as the current solution so as to generate a new and more optimized solution.The above process is repeated until the speed at the end of the grade turns out to be reasonable.The final solution is the optimized combination of operating states.