Research On Suspension Parameters Optimization Of The Bogie For 120Km/H Standard A-Type Metro

With further research on railway technology and rapid development of urban economy,urban rail transit plays an important role in the urban transit network.Nowadays,more than 51 cities in China have built urban rail transit.The types of urban rail vehicles and their bogies are also various.On July 31 th,2019,the National Development and Reform Commission of the People’s Republic of China approved the project-"Development and Test of Serialized China standard metro train".The project focuses on solving core technical problems and realizing industrial scale and industry standardization.Standardized design and research on the metro train is conducive to realizing standardization of metro vehicles and different metro vehicles work in different lines,realizing functional and operation norms,making the train’s internal system and key components being mutually used.Researching on Serialized China standard metro train is favorable to improve international competitiveness and influence of rail transit technology of China.In view of this background,the 120km/h standard A-type metro vehicle is taken as the research object in this thesis.Based on the three-dimensional coupled dynamics model of air spring suspension system,the suspension parameters of metro vehicles are optimized.This thesis uses the co-simulation method,which uses SIMPACK and MATLAB/Simulink,to study and optimize the configuration of secondary suspension vertical damping and dynamic stiffness of composite node,which is under failure,of the 120 km/h standard A-type metro vehicle.This thesis introduces the research background,the research status of rail vehicle in the aspect of suspension system and air spring suspension system.Based on the three-dimensional coupling dynamics model of air spring suspension system,this thesis puts forward the necessity of studying the performance of suspension system of the 120km/h standard A-type metro vehicle.The model theory of dynamics model of air spring and metro vehicle,the evaluation method of metro vehicle dynamic performance that based on GB/T5599-2019,and the co-simulation method are also introduced.Simulink is used for the modeling of three-dimensional coupled dynamics model of air spring suspension system.SIMPACK is used for the modeling of metro vehicle.Finally,the three-dimensional coupled dynamics model of air spring suspension system is verified.This thesis focuses on the calculation and analysis of the dynamic performance of the 120km/h standard A-type metro vehicle,which runs under different secondary vertical damping configurations and different working conditions,by comparing the critical hunting speed,running stability and running safety.Then,according to these analysis results,the second vertical damping configuration of the metro vehicle is selected.Based on the above choices,the dynamic performance of the metro vehicle under the failure condition of the composite node is analyzed,calculated and compared.After that,the stiffness of the composite node is selected.Through the analysis of the calculation results,the following conclusions are drawn:(1)the air spring with 12 mm orifice can not only guarantee dynamic performance of the metro vehicle in a satisfactory level,but also save production cost and reduce design and process difficulty;(2)in the case of the failure condition of the composite node,the dynamic performance of vehicle still meets the stipulation of GB/T5599-2019.Among the four types of stiffness of the composite node,using the second one of design parameters give the possibility to make dynamic performance of the vehicle better.