Author(s)

Zihang Zhang, Junfeng Wang, Ziqun Zhang, Yali Lei

Corresponding Author

Zihang Zhang

ABSTRACT

Turn-back capacity of the turn-back station is the key point which affects the operating capacity of the suburban railway. The design of the turn-round track in station is the prime factor which affects the turn-back capacity. Meanwhile, the length of turn-round track is partly determined by its safety distance, so the safety distance may enhance or decrease the turn-back capacity of the station. On account of the perspective of signal systems, the simulation software for the Turn-round Track safety distance has been designed based on the characteristics and design specifications of the suburban railway. According to the braking model laid down by IEEE 1474.1, the influence of the safety distance on the train operation under the circumstance of the automatic turn-back control was analyzed by a safety distance calculation model on CBTC(Communication Based Train Control System).The mileage-time diagram was drawn by the entire turn-back simulation process. Based on the influence of safety distance to turn-back capacity, the optimal turn-round track safety distance within simulated scenario was obtained. Finally, a typical turn-back operation after station on the Fuzhou Airport Line was taken as an example for simulation. The results indicated that the turn-back capacity and operating efficiency was improved by the reasonable setting of the safety distance.

KEYWORDS

Suburban railway; safety distance; turn-back capacity; signal system; simulation design