Dynamic Characteristic Analysis And Parameter Optimization Of High-Speed Train Gear Transmission System

The gear transmission system is an important part of the bogie of high-speed trains,which is responsible for transmitting the traction motor power to the wheel pairs and plays an important role in ensuring the power transmission of high-speed trains.With the increasing speed of high-speed trains,the working environment of the gear transmission system becomes more and more severe,which has a negative impact on the dynamic characteristics of the system and seriously affects the train stability and safety.It is of positive significance to reveal the influence of various factors on the dynamic characteristics of the gear transmission system and to improve the dynamic performance of the system for vibration and noise reduction.This thesis will introduce the theory of multi-body dynamics and combine computer simulation technology with intelligent optimization algorithm to analyze the dynamic characteristics and optimize the parameters of high-speed train gear train system.The main work of this thesis is briefly described as follows:The single factor test was conducted to reveal the influence of the single action of each factor on the dynamic characteristics of the gear transmission system.The dynamics model of the gear transmission system is established by using Recur Dyn,and the simulation analysis is carried out under rated working conditions,and the validity of the dynamics model is verified based on the comparison of the relative speed and dynamic meshing force of the gear pair obtained from the simulation analysis and theoretical calculation.Bearing clearance,backlash and friction coefficient are determined as design variables,gear meshing force,gear vibration acceleration and system transmission error as dynamic characteristic indexes,and single-factor test is conducted by the control variable method to obtain the influence law of single effect of bearing clearance,backlash and friction coefficient on the dynamic characteristics of the system.The multi-factor test was conducted to reveal the influence of the interaction of each factor on the dynamic characteristics of the gear transmission system.Based on the analysis results of single-factor test,the maximum value of meshing force,the peak to peak value of transmission error,the root mean square value and the maximum value of longitudinal acceleration of pinion are determined as the dynamic characteristic indexes,and the multi-factor test is carried out by BBD method.Based on the results of multi-factor test,the quadratic regression model of each index is fitted,and the reliability diagnosis,ANOVA and response surface analysis of each regression model are carried out to obtain the influence law of the interaction of each factor on the dynamic characteristics of the gear transmission system.The macro parameters and micro parameters of the transmission system are optimized to improve the dynamic performance of the gear transmission system.The three macroscopic parameters of the transmission system are optimized with the minimum performance index as the optimization target,and the optimal dynamic performance of the system is verified through tests.In order to further improve the performance of the gear transmission system,the microscopic parameters of the transmission gear are optimized.The four microscopic modification parameters of the transmission gear are determined as the design variables,and the minimum contact stress and transmission error peak to peak value are determined as the optimization objectives,and the response surface optimization model between the design variables and the objective function is fitted,and the multi-objective beluga whale optimization algorithm is applied to solve the model and obtain the optimal solutions for the design variables.The results show that the peak to peak value of the transmission error of the optimized system is greatly reduced,the tooth flank bias and stress concentration problems are improved,and the performance of the gear transmission system is comprehensively improved.This thesis reveals the influence of single action and interaction of bearing clearance,backlash and friction coefficient on the dynamic characteristics of the gear transmission system,and optimizes the macroscopic and microscopic parameters of the gear transmission system to improve the dynamic performance of the system,which can provide theoretical basis and reference for the performance optimization of the gear transmission system of high-speed train.