Study On Optimization Of Longitudinal Dynamics Of Coupler Force On Urban Rail Transit

Urban rail transit plays an extremely important role in China's transportation industry.The mileage of urban rail transit in our china has been increasing rapidly in the past ten years with an average annual growth rate of 25%.In view of the rapid development of urban rail transit,the safety of train operation become a top priority.Therefore,this paper establishes a corresponding simulation model for different operating conditions of train operation,and then uses the optimization of the coupler force as the control target,and simulates the longitudinal dynamics of the train.The purpose is to obtain a control strategy for each operating condition of the train.The optimized control strategy will further improve the running safety factor of the train,reduce the probability of train failure,and further provide guarantees for train operation safety.First of all,this paper analyzes the dynamics equations of trains running under different operating conditions of urban rail transit trains.Based on the train kinematics equations,the simulation model of the single-mass train was built using matlab simulation software.Through the established single-mass model simulation,the traction characteristics curve,speed curve and acceleration curve of the train under different operating conditions can be obtained,which lays a solid foundation for the next multi-point model establishment.Secondly,on the basis of the original single-mass model,through the further kinematics analysis of the train,a multi-particle train simulation model is established.Under the different operating conditions of the train(traction,cruising,inertia,braking),by using the coupler force as the optimization objective function,the optimal traction distribution or braking force distribution mode of the train under different working conditions is obtained.Based on this simulation model,simulations were carried out under a series of complex conditions such as different train loads,different operating modes of trains,and different gradients.Through a series of simulations,the control strategy for the train's distribution of traction force or braking force under different operating conditions can be obtained by the optimizing the train coupler force.Then,on the basis of this research,a semi-physical real-time simulation system for urban rail transit that incorporates this vehicle dynamics model was developed.That is,a real-time software plus hardware simulation system was established through Labwindows CVI software programming.This system can realize the semi-physical real-time virtual simulation of the train under different operating conditions.In this system,the real console of the train and the scene of the cab during the running of the train can be clearly seen,and the data of the running time of the train can be displayed in real time.Finally,through the simulation of real-time control of urban rail transit train,we can effectively collect and observe the simulation data of urban rail transit trains under different operating conditions in real time.A reasonable solution for the train running in real conditions will be provided by analysing of data deeply.