Research On Running Status And Monitoring Technology Of High-Speed Railway Contact Wire

Now,high-speed railway is the most important part for China's railway system,keep the operational safety is an important issue for railway research.The contact wire is an important part of the traction power supply system,so keep the safey and reliability of contact wire have great significance.However,if contact wire which has complex running environment and no backup has errors,it will directly affect the normal operation of the train and bring huge economic losses.So,the running status monitoring for contact wire is particularly important.At present,there is little systematic research about contact wire running status in the domestic field.The current researches focus on the result of the train's performance.Through the pantograph-catenary working status and train parameters change when the train is working,the running status of the contact wire can be judged.This dissertation presents a contact wire running status monitoring system.The system realizes the assessment of contact wire running status by monitor the whole contact wire system's parameters.The main contents are as follows:Firstly,based on the deep analysis of compensation structure,this dissertation proposes a novel tension force monitoring method of contact wire.Through the interrelation between tension force of contact wire and motion characteristics of compensation device,the method focuses on the change of dip angle of tension wheel and acceleration of concrete weights when the tension force changing.Then,in order to eliminating the monitoring error which is affected by damping effect,the dissertation proposes to use Gauss-seidel iterative algorithm to improve the monitoring accuracy.Based on the spatial structure,finite element model of catenary has been built to demonstrate effectiveness of new method.By applying different point of view and the action of different intensity of vibration load,the results of the change of tension force,dip angle and acceleration with different condition are simulated and analyzed.The results show that the monitoring method and its error correction algorithm which is proposed are highly efficacious.Secondly,this dissertation research on the contact wire's change regularity and monitoring method.Based on the theory of temperature rise,the change of temperature with different current and contact resistance has been simulated.In consideration of the relationship between the temperature and the running status of contact wire,this dissertation proposes the monitoring method of contact wire's temperature.The method,based on the investigation and survey of the working environment,uses infrared thermal imaging technology to detect the contact wire's temperature.As infrared thermal imaging technology respond to environmental signals,in order to correct the error,images retrieval technology based on support vector machine(SVM)has been used.The monitoring result has been modified by histogram of oriented gradients and color histogram.Besides,through the experiment,the effectiveness and feasibility of the method has been verified.Thirdly,contact wire running status evaluation method based on fuzzy neural network(FNN)algorithm has been presented.By extracting the characteristic parameters and choosing the appropriate membership function,the model of contact wire running status has been constructed.Based on railway technical norms,the method chooses the tension and temperature as characteristic parameters and establishes assessment criteria and evaluation system for the running status.Moreover,this dissertation carries out running status monitoring system prototype.As for the characteristic parameters measurement of the line in operation need to overcome practical difficulties,the tension monitoring method of contact wire based on angular displacement of tension wheel and vibration of concrete weights has been proposed.And the monitoring sites for detect temperature has also been proposed.The system realizes data storage,wireless communication and man-machine interaction.The test on the operating high-speed railway has been finished,and the test establishes prototype system's effectiveness.