Reliability Analysis And Fatigue Life Prediction Of Key Components Of High-Speed Variable-Gauge Bogies

With the steady implementation of China’s "the Belt and Road" strategy,transnational transportation is increasingly frequent.Railway transportation is the best choice to achieve international transportation,but the gauge varies among countries.The gauge changing bogie technology is considered to be the best choice to solve the gauge problem.With the increasingly frequent trade between China and Eurasian countries,in order to further exploit the advantages of railway transportation,it is necessary to develop high-speed rail transit trains.High speed track change trains rely on track change bogies to achieve track change functions;The development of track change technology in China is relatively late,and the technology of high-speed variable gauge bogies is still immature.In this paper,the key components of variable gauge of high-speed gauge bogie are studied,finite element models are established for the key components of gauge change,and the strength calculation and reliability analysis of the key components of gauge change are carried out according to relevant standards.The dynamic model of the high-speed gauge change train is established,the load spectrum of the key components of each gauge is obtained by simulation,and finally the fatigue life prediction of the key components of each gauge is predicted.The main content of this article is as follows:1、For the studied high-speed variable-gauge bogie,its basic structure and variablegauge process are analyzed,and thus the axle box,slider,unlocking-locking mechanism,wheels,axles,and sliding bushings are identified as the variable-gauge key components of the high-speed variable-gauge bogie;the finite element model of each variable-gauge key component is constructed based on Hyper Mesh,and the modal analysis of each variable-gauge key component is carried out by Ansys software.The analysis results meet the requirements of Interim Provisions on Strength Design and Testing of Railway Vehicles of Speed Class200Km/h and above,and the key components of variable gauge can guarantee the normal operation of variable gauge trains.2、The strength calculation and reliability analysis of the key components of the variable gauge axle box were carried out.According to China’s TB/T3549-2019.1 specification,the load conditions of the axle box,slider and unlocking-locking mechanism were analyzed and determined,and the static strength of each key component of the variable gauge axle box was analyzed by using Ansys software.The analysis results show that all the key components of the variable gauge axlebox meet the strength requirements.Using the Six Sigma Analysis module of Ansys software,the strength reliability of key components with variable gauge axle box was analyzed,and the results showed that the strength reliability of key components met the requirements.3、The strength calculation and reliability analysis of the key components of variable gauge wheelsets were conducted.Static strength analysis and fatigue strength evaluation were conducted on key variable gauge components such as axles,wheels,sliding bushings,and connecting splines in accordance with TB/T 2395-2018,UIC OR 510-5,and GB/T 17855-2017 standards.The analysis results show that all key variable gauge components of the variable gauge wheel set meet the standard requirements.The Six Sigma Analysis module of Ansys software was also used to analyze the strength reliability of key components with variable gauge wheel sets.The analysis results showed that the strength reliability of key components with variable gauge axle box met the requirements.4、The fatigue life prediction of the key components of high-speed variable gauge bogies with variable gauge is carried out.Firstly,a dynamic simulation model of high-speed variable gauge trains is established based on SIMPACK,and the load spectra of key components with variable gauge are obtained;Then,using the fatigue life analysis software n Code,based on the linear fatigue cumulative damage theory and the Goodman average stress correction method,the fatigue life of key components with variable gauge was predicted and analyzed.The analysis results showed that the fatigue life of all key components with variable gauge met the condition of 15 million kilometers required by the "Provisional Technical Conditions for Chinese Standard Multiple Unit with a Speed of 350 kilometers per hour",This provides a theoretical basis for the further development of variable gauge bogies.