Research on Optimization Method for Profile Design of Hump Distributing Zone Based on Automatic Uncoupling Technology
Compared with manual uncoupling method,automatic uncoupling technology,with shorter response time and more precise control,can adapt to higher pushing speed,and improve the efficiency of train breaking-up operation at the hump.However,higher pushing speed means greater initial kinetic energy of car groups and shorter rolling interval time between car groups,which puts new requirements for the profile of the hump.In order to study the impact of automatic uncoupling technology on the hump profile,this paper proposed a multi-objects optimization model for the profile design of hump distributing zone under automatic uncoupling application,with the maximum pushing speed,the minimum cu-mulative weighted rolling time and the minimum height of optimized area as optimization objectives,using the number of slopes,gradients of the slope,and position coordinates of the gradient change points as decision variables,and the posi-tion of the gradient change points,the maximum allowable entrance speed of shunting turnout,and the minimum rolling speed at the end of the optimized area as constraints.Meanwhile,a heuristic algorithm was designed.The simulation cal-culation results show that compared with the profile design based on current hump design code,the proposed optimized hump profile design demonstrates a 9.5％increase of initial rolling speed,6.0％reduction of weighted accumulating roll-ing time,4.6％reduction of height of the optimized area,7.6％increase of overall operation efficiency of the hump,and reduction of approximately 151 kJ per vehicle in the average braking energy consumption.The research can provide theo-retical support for the transformation of the hump profile using the automatic uncoupling technology.
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