The Research On The Utilization Of Receiving And Dispatching Track On The Marshalling Station

As the primary production unit of railway transportation, Marshaling staions are the key nodes of the rail hub and the main rail lines. The mainly works of marshaling stations are handling the classification and assembly of freight trains, and make sure the trains are departed on time according to the departure schedule. The daily operation of marshalling station is under the instruction of station operating plan whose core is stage plan. And the yard track utilization of the marshalling station is more important part of stage plan. Its direct target of optimization is continuous train reception and departure on time, to avoid the crossing of routs, which is very important to the operation of marshalling station.This thesis first introduces the significance of this study, summarizes the current domestic and overseas status of this study, which leads to the main content and structure of this paper. Then, traffic operation and switching service on the receiving-departure line are introduced. In order to solve the clashes between traffic operation and switching services in railway yard throat, an approach to discongest the crossing of routs is put forward. This paper also analyzes the time when the train is operated on the receiving-departure line in yard throat and studies the relationship among train working diagram, shunting operation plan and flow assignment plan. By introducing the concept of "time window", a study on the track and route allocations then carried out to establish the corresponding constraint relations. At the same time,"minimum buffer time of track occupancy" is introduced in this paper to assure the train is delivered to the specific track as possible. Based on the target of balanced use of track and receiving-departure line, a multi-objective mathematic model of optimization of the receiving and departure line in the marshalling station is established.At last, this paper takes the downbound receiving yard of Chengdu marshalling station North as an example to make the use plan of the minimum buffer time of track occupancy and balanced use of track into full consideration. Comparing different outcomes, we can prove that the use of receiving-departure line can be optimized in both ways, which provides a theoretic basis for the automatic organization of the use plan of the receiving-departure line.