Simulation Research On Capacity Expansion Of Qinghai-Tibet Railway Based On Cellular Automata

The transportation capacity of the Qinghai-Tibet Railway's Gela Section is now close to its upper limit.Facing the growing prosperity of the Qinghai-Tibet Region and the urgent need for social and economic development,it is obvious that the current transportation capacity of the Gela Section is difficult to match with it.Based on the above reasons,the capacity expansion It is necessary to carry out the reconstruction in Gera.Therefore,it is necessary to expand the capacity of the Golmud Lhasa section.Compared with other lines,the Golmud Lhasa section has no track circuit,and the train positioning needs to rely on satellites.The natural environment of the region it passes through is complex and the capacity expansion is difficult.The existing capacity expansion measures at home and abroad cannot be fully applied to the Golmud Lhasa section It is an urgent problem that how to optimize the allocation of the limited resources and obtain a large capacity in the Golmud Lhasa section.This paper will carry out in-depth research in this field.The main research contents are as follows:(1)The capacity expansion scheme design of gra section.The distance between some stations in gra section is too large.The automatic inter station block operation controlled by ITCs has low parallel map capacity.The train positioning relies on GPS satellite.GPS train positioning has been generally successful in the 14 years since the Qinghai Tibet railway opened.However,the GPS intellectual property rights of GE company in the United States have the phenomenon of human precision reduction in the actual operation process,and the maintenance costs are high and the cycle is long Therefore,it is urgent to introduce the Beidou train positioning system independently developed in China,and replace the existing automatic inter station block with single line two-way quasi mobile block.Under the background of developing independent intellectual property rights,it can effectively shorten the train operation cycle and improve the line transportation capacity.At the same time,it analyzes the technical barriers existing in this way of capacity expansion and puts forward solutions Further research provides the basis.(2)Simulation of cellular automata for automatic inter station block of single track railway.Firstly,the simulation is carried out according to the current situation of gra section.Compared with double line and multi line railway,in the operation of single line train,only one train is allowed to run in the same section or block area at the same time,and the overtaking of opposite train and same direction train can only be carried out in the station.The simulation is more difficult than that of double line,and "deadlock" is easy to occur in the simulation.In order to solve this problem,firstly,boundary setting,train It will make five parts such as crossing,inbound processing,station processing,deadlock easing and so on.Then,on the basis of the completion of the model,we can reverse the program parameter settings by running the pattern map,and finally adjust the three factors of the mixed proportion,the number of arrival and departure lines and the stopping time.Statistics of the changes.(3)Simulation of single track railway quasi moving block cellular automata.In order to quantitatively reflect the effect of the capacity expansion measures proposed in this paper,based on the block cellular automata model between single track railway automatic stations,block zones are introduced,the conditions of train departure at the departure station are added,and the departure time interval and distance interval are added.Because the train tracks in the interval,the acceleration and deceleration characteristics of the train and the minimum tracking safety distance are added,the single track is realized The cellular automata model of line bidirectional quasi moving block.On this basis,the paper discusses the three factors of mixed traffic ratio,station spacing and dwell time.Under the quasi moving block of single track railway,the influence of mixed traffic ratio on the throughput and utilization ratio of arrival departure track is discussed.It is found that the throughput of the whole line increases by 13.49% on average with the change of mixed traffic ratio of passenger trains,and by15.26% on average with the adjustment of dwell time.At the same time,the utilization ratio of arrival departure track is obtained To enhance,it shows that the effect of capacity expansion is good,but higher requirements are put forward for station and line conditions.