Research on Constructing Method of Multi-cycle Planning Diagram Combining Trunk and Branch of CHINA RAILWAY Express
At present,CHINA RAILWAY(CR)Express,usually running on a weekly or daily cycle,with multi-cycle and multi-frequency characteristics,is difficult to adapt to the daily railway train diagram.There are problems with CR Ex-press,such as unbalanced capacity utilization,loss of train paths,difficulty in transportation organization,and periodic capacity constraints at passageways and port stations.This paper proposed a trunk-branch combination constructing method of CR Express multi-cycle planning diagram,simplifying the problem of constructing planning diagram into a problem of local transportation capacity resource allocation under complex coupling constraints.A multi-cycle planning diagram con-structing model of CR Express based on trunk-branch combination was constructed,with the total time from the time when trains satisfied the departure conditions to the final arrival time and the total stop time of trains at intermediate stations as the objective functions,and with train departure time window,train headway times,skylight time,peak passenger flow pe-riods and trunk line capacity resource allocation as the constraint conditions.This paper designed an example and compiled a planning diagram featuring periodicity,balanced utilization of capacity and smooth operation.The results show that the planning diagram constructing method of trunk-branch combination is suitable for dealing with the timetable scheduling problem of multi-cycle complex transportation systems,and is conducive to promoting the fixed and periodic operation,balanced utilization of railway network transportation capacity resources,and timetable-based operation for CR Express.
CHINA RAILWAY Expresstrainoperation planning diagramtransportation organizationtrunk-branch combinationtransportation capacity resources
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