This paper deals with both the leading train and the following train in a train tracking under a four-aspect fixed autoblock system in order to study the optimum operating strategy for energy saving. After analyzing t...This paper deals with both the leading train and the following train in a train tracking under a four-aspect fixed autoblock system in order to study the optimum operating strategy for energy saving. After analyzing the working principle of the four-aspect fixed autoblock system, an energy-saving control model is created based on the dynamics equation of the Wains. In addition to safety, energy consumption and time error are the main concerns of the model. Based on this model, dynamic speed constraints of the following train are proposed, defined by the leading gain dynamically. At the same time, the static speed constraints defined by the line conditions are also taken into account. The parallel genetic algorithm is used to search the optimum operating strategy. In order to simplify the solving process, the external punishment function is adopted to transform this problem with constraints to the one without constraints. By using the real number coding and the strategy of dividing ramps into three parts, the convergence of GA is accelerated and the length of chromosomes is shortened. The simulation result from a four-aspect fixed autoblock system simulation platform shows that the method can reduce the energy consumption effectively in the premise of ensuring safety and punctuality.展开更多
In this work,we propose a kind of cellular automaton model to simulate the railway traffic which is based on NaSch traffic model.The signaling system adopted in this work is the three-aspect fixed autoblock system.We ...In this work,we propose a kind of cellular automaton model to simulate the railway traffic which is based on NaSch traffic model.The signaling system adopted in this work is the three-aspect fixed autoblock system.We investigate the space-time diagram of traffic flow using our model.The velocities and headways of trains are discussed.The impact of the time interval of trains on train running is also analyzed.Numerical simulation results demonstrate that our cellular automaton model can successfully reproduce some actual railway traffic phenomena.展开更多
基金supported by the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period of China (No.2009BAG12A05)
文摘This paper deals with both the leading train and the following train in a train tracking under a four-aspect fixed autoblock system in order to study the optimum operating strategy for energy saving. After analyzing the working principle of the four-aspect fixed autoblock system, an energy-saving control model is created based on the dynamics equation of the Wains. In addition to safety, energy consumption and time error are the main concerns of the model. Based on this model, dynamic speed constraints of the following train are proposed, defined by the leading gain dynamically. At the same time, the static speed constraints defined by the line conditions are also taken into account. The parallel genetic algorithm is used to search the optimum operating strategy. In order to simplify the solving process, the external punishment function is adopted to transform this problem with constraints to the one without constraints. By using the real number coding and the strategy of dividing ramps into three parts, the convergence of GA is accelerated and the length of chromosomes is shortened. The simulation result from a four-aspect fixed autoblock system simulation platform shows that the method can reduce the energy consumption effectively in the premise of ensuring safety and punctuality.
基金the National Natural Science Foundation of China through Grant No.70471088the National Outstanding Young Investigator of the National Natural Science Foundation of China through Grant No.70225005.
文摘In this work,we propose a kind of cellular automaton model to simulate the railway traffic which is based on NaSch traffic model.The signaling system adopted in this work is the three-aspect fixed autoblock system.We investigate the space-time diagram of traffic flow using our model.The velocities and headways of trains are discussed.The impact of the time interval of trains on train running is also analyzed.Numerical simulation results demonstrate that our cellular automaton model can successfully reproduce some actual railway traffic phenomena.
