Operation Diagram Based Traction Calculation For Multiple Trains

Train Traction Calculation is a practical discipline that studies the railway trains'traction based on mechanics.It is applied to all aspects of railway construction and plays an important role in rail traffic.The research on traction calculation of single train is relatively mature nowadays.It usually uses the time-saving and energy-saving traction control strategy.In the research of traction power supply load,most of the train traction calculation softwares have no strict constraint of the train running period,nor consideration on the circumstances that different types of trains mixed-running on the same line.In the practical running organization,the train needs to follow the existed running diagram,and the train type and running control are more complicated.From the perspective of power supply for traction,it reflects the practical demands of the train load,and is of significance for the power supply load calculation.Therefore,this paper carries out the research.and software development of multi-train operation control method based on diagram.Firstly,the paper analyzed the basic theory of train traction calculation.It has established the mechanical model of train traction calculation,and derived the motion equation according to the relationship between the acceleration and resultant force of the train,taking the hybrid optimization model with the combination of single-particle and multi-particle as the train model.It also determined the calculation method of train power,gave the calculation formula of the electric power at the pantograph of the train,and established the data interface for the power supply calculation.Secondly,the paper has studied the multi-train traction calculation control strategy.The main contents are:Proposing the multi-train hybrid running control method and establishing a framework for multi-train traction calculation based on operation diagram.Expounding of the mixed running methods of different types of trains,and detailed analysis of four running conditions,which are train traction,cruise,coasting,and braking,and their switching process.Realizing the train's punctual and energy-saving running by optimizing the train running condition sequence based on the genetic algorithm,and single train running control based on the running diagram,combining the constraint that the line obstruction section would affect on the train running line excursion range.Determining the minimum safety interval of adjacent trains.According to the multi-train hybrid running control method,it has respectively realized multi-train running simulation and traction calculation based on the operation diagram and the calculation of the shortest tracking interval of the train,and has provided a basis for the design and adjustment of the running diagram.Thirdly,it has designed and implemented multi-train traction calculation simulation software based on the proposed control strategy.According to the actual research results,it has carried out a demand analysis on the software's function,data and performance.It has designed the software key module,including data module,function module and output module.The function module has mainly realized single train traction calculation under the time-saving strategy,single train and multi-train traction calculation based on running diagram.It has carried out software interface design and function realization in the Visual Studio development environment using C#,including software main interface,data management interface,function operation interface and result displaying interface and so on.Finally,taking the Beijing-Tianjin inter-city railway and the standard Electric Multiple Unit as an example,the paper has carried out the train traction calculation based on the running diagram,and verified the accuracy of the software by comparing the calculation results with the measured data.At the same time,it has analyzed the anastomosing level of the simulation running diagram and the planned running diagram.The results show that the traction calculation software can accurately follow the existed running diagram and realize the control strategy of punctuality priority.