Analysis Optimization And Experimental Research Of Main Circuit Breaker For EMU

Along with society’s development and progress,people more and more high to the requirement of traffic,rail transit industry ushered in unprecedented opportunities for development,the pace of China’s high-speed rail and other railway passenger transport network has more than 40000 kilometers,greatly convenient for the transportation of people,made great contributions to the development of social economy,the development of China’s high-speed rail speed repeatedly is amazing all over the world.The main circuit breaker,as a key component in the high voltage electrical box of the emus,is a switch device for closing,carrying and breaking the normal circuit current,and also the main switch for the power supply of the emus.Therefore,the normal closing performance of the main circuit breaker is directly related to the normal operation of the emu electrical equipment.A large number of practice and test data show that the main factor affecting the life of the main circuit breaker is the closing bounce.In this paper,the main circuit breaker of a certain type of emu is taken as the research and analysis object,its working characteristics are studied,the factors affecting the bounce are explored,and the existing bounce problems are optimized and reasonable solutions are proposed.According to the basic requirements of the main circuit breaker of the emu,combined with the characteristics of the main circuit breaker of the emu at home and abroad,and the actual application situation,the main circuit breaker is divided into pneumatic control circuit and mechanical operating mechanism.By analyzing its structure and functional parameters,and using the method of computer numerical simulation,the two parts are simulated together to study its working characteristics.The pneumatic control loop mainly provides the closing power for the mechanical operating mechanism.AMESim software is used in this part to build the simulation calculation model of the pneumatic control loop of the main circuit breaker and analyze and study each pneumatic component.Taking the mechanical operating mechanism as the core component of the main circuit breaker,the virtual prototype model of the main circuit breaker was established by using ADAMS software,and the dynamic simulation calculation was studied.Subsequently,the pneumatic control circuit and mechanical operation mechanism of joint simulation analysis,the output force of the cylinder in the AMESim import ADAMS,build complete machine main circuit breaker-joint simulation model of mathematical calculation,electricity,gas integration research including rated,contactor distance,just minutes from speed,distance,spring and the stiffness of the reset spring and its compression force and air pressure on the closing time,closing bounce time and the effects of parameters such as brake time,get a series of air pressure,output force,collision force,displacement,speed and other related parameters curve,analyses its working performance.Finally,the feasibility and correctness of the simulation calculation are verified by the physical prototype test of the main circuit breaker.Through the research of this subject,ADAMS dynamics simulation software and AMESim fluid dynamics dynamic simulation software are used in the design and analysis of main circuit breaker to obtain good use effect and broad application prospect.Using ADAMS and AMESim co-simulation technology to establish a reasonable virtual prototype model for simulation analysis,it can be convenient to study the influence of various parameters on the performance of the main circuit breaker,effectively shorten the test cycle of the main circuit breaker,improve the product performance,increase the market competitiveness,and provide methods and experience for the development of new products.