Research On The Optimization Method Of The Partition Of High-speed Railway Block Section Based On Gravity Search Algorithm

In recent years,China’s high-speed railway construction has developed rapidly.At the same time,how to better ensure the efficient and safe operation of trains has also become the focus of attention.The partition of the high-speed railway block section should be completed in the railway signal design stage.The result of the partition affects the safety of trains,passing capacity,and capital investment.Reasonable planning of the high-speed railway block section is of great significance to enhancing railway transportation performance under the premise of keeping safety.At this stage,the quasi-moving block is the main block mode of China’s high-speed railway sections.This thesis establishes a model of partition of the high-speed railway block section based on the quasi-moving block.Specifically,the block section partition model is based on train traction calculations and other requirements of partition of the high-speed railway block section.In addition,influence of different railway longitudinal section simplification schemes on high-speed railway block section partition is fully considered,and the optimization goal of the model is to shorten the tracking interval.The main research contents of this thesis are as follows:(1)The influence of the railway longitudinal section simplification schemes on the division of the high-speed railway block section was analyzed.Aiming at the problems of non-unique results of the existing railway longitudinal section simplification and its rationality to be verified,this thesis proposed a railway longitudinal section simplification algorithm based on DP(Dynamic Programming).The algorithm simulates the train section tracking operation process,and aims at optimizing the train section tracking interval.Meanwhile,a multi-stage optimal decision-making method is used to solve the problem of railway longitudinal section simplification.The simulation results show that the railway longitudinal section simplification scheme generated by the algorithm complies with the relevant regulations in "TB/T 1047.1-2018",and it is suitable for on-site railway longitudinal section simplification to automatically and effectively shorten the train tracking interval.(2)This thesis analyzed the train traction calculation process,the process of train running in section,and issues that could affect the length of the block section and the signal point location of the block section,summarized the influencing factors and objectives of the block section partition under quasi-moving block,and established the block section partition model.(3)The railway longitudinal section simplification scheme was used as part of the line data for the process of block section partition,and GSA(Gravity Search Algorithm)was adopted to solve model of the block section partition.Aiming at the problem that the gravitation search algorithm is easy to have convergence stagnation,the gravitation coefficient and the speed update process of the gravitation search algorithm were modified,and the variation process was added.The partition of the high-speed railway block section was conducted based on the actual conditions of a certain line.The results show that the block section partition scheme generated by the research method in this thesis complies with the requirements of block section partition.Compared with the actual train tracking interval in the field,it is shortened by 0.3min,which verifies the superiority of the algorithm in solving the problem of high-speed railway block section partition.