Research On Key Parameters Fitting Of Urban Rail Train Model

In recent years,the development of urban rail transit has led the rapid development of urban rail train design and manufacture,signal equipment supply and other related industries.More and more universities and research institutes have been engaged in basic research and applied research of rail transit area.As the basis of the research,the train dynamics model has a great impact on the train operation control.While the train model is not accurate enough,the theoretical energy saving effect is different from field measurement in the energy saving optimization of urban rail transit.Therefore,it is of great significance for the engineering and theoretical research to establish the accurate train model.According to the running process and data characteristics of the train,the single-mass dynamic model of the urban rail train in line with the actual train operation is established based on the running conditions of the train in the paper.The train model is divided into the coasting stage model,the traction stage model and the braking stage model.The traction stage is divided into the traction establishment and the traction removal.Among them,the traction establishment stage is divided into low-speed and high-speed.The train model is divided into several models,which can describe the actual train running process more accurately.An improved algorithm CIP-FOA(Fruit Fly Optimization Algorithm with Changing Iteration and Population)is proposed based on FOA for parameters fitting calculation in the paper.The algorithm is improved from two aspects of iteration and population through changing the radius of the step.Compared with other algorithms,the results show that CIP-FOA has obvious advantages in terms of stability,accuracy and computational efficiency.The field test data of Yizhuang line in Beijing subway has been processed and analyzed in the paper,and CIP-FOA is used to calculate 14 model parameters including the basic resistance parameters of the train,parameters for the stage of low-speed traction,parameters for the high-speed traction and those for the traction removal."Simulation Software of Urban Rail Dynamic Model" is developed based on the dynamic model of the urban rail train and CIP-FOA in the paper,which is used to be fit for parameters calculation and model simulation verification.The train running data of different control strategies are simulated and analyzed by the software.According to the comparison and analysis of the simulation results,it is verified that the established model is fit for the actual model of the train well.The results show that the paper has great impact on engineering design and train performance prediction.