Fatigue Strength Analysis Of High-Speed Bogie Frame Under Special Loading

As the speed and loads go increasingly up, Railway vehicles in actual operation will run in a state that the operating condition of interior parts gets worse and worse. The safety performance of the various components is now attracting more and more attention. An important component for the train is the bogie frame, whose fatigue strength plays a vital role in the process of train operation. With the new generation of a variety of special loads, the impact on fatigue effect of the bogie frames keeps changing, so the study of the fatigue strength in various failure conditions is imperative.With an access to all kinds of relevant information, I’ve obtained at home and abroad a full understanding of the main methods of dynamic simulation and major ways of the load spectrum for train operation. Under the guidance of theoretical knowledge, targeting high-speed car bogie and inspired by Qin-Shen Line and Jiao-ji track spectrum, we launch a dynamic simulation to acquire a variety of failure cases under the working conditions as well as the load spectrum in different ways of stiffness suspension, on which the study of fatigue assessment is based.Under the guidance of the various methods of fatigue damage at home and abroad, the framework is first to be executed for an finite element analysis to work out the gravity parameters, and then we import the result to the fatigue assessment software Nsoft to defined SN curve. And then select various parameters of injury analysis, adopt the correct assessment of calculation methods and impose the load time histories calculated by the dynamics, where the load time history in Nsoft after rainflow counting statistics is carried out for a load average and amplitude, through which the injury results and results of life expectancy of the framework can be turned out.