High-speed Train Dynamics And Control Of Lateral Vibration

In recent years, high-speed railway industry has achieved great success during its rapiddevelopment in China. With the continuous increase of train speed, many new problems concerningdynamical property are coming up. Thus, in order to improve high-speed trains’ dynamical propertiesunder different route conditions and under different speeds, we apply active or semi-active suspensionto the train. Compared with the active suspension, semi-active suspension has advantages of simplerstructure, lower cost and higher failure guiding security. Moreover, its control effect is quite close to thatof the active suspension is the most effective approach to improve the dynamical performance ofhigh-speed trains.In this paper, the computational software SIMPACK is used to establish the rigid vehicle dynamicmodel of single car and three connected cars of the train, as well as the coupled rigid/flexible vehicledynamic model considering the train’s elasticity. Then snakelike critical velocity under the actualrailway spectrum can be calculated respectively. The single-car rigid vehicle model is meant to studythe effects on dynamical property arising by different speeds with common railway spectruminterference. And obviously, the higher the running speed of the train has, the larger the dynamicalperformance coefficients will be. Making the rigid vehicle model and the coupled rigid/flexible vehiclemodel have the same route condition and the same speed, compare their dynamical properties includingrunning steady, comfort and derail coefficient. After comparison, the acceleration of the coupledrigid/flexible vehicle model is found to be larger than that of the simple rigid vehicle model. Hence, thecoupled rigid/flexible vehicle model can fits the real condition more accurately.In addition, the aerodynamic effect on the trains’ dynamical response while the trains passingthrough each other is also analyzed. The computational fluid analysis software FLUENT is used tocalculate the pressure distribution on the trains’ surface as well as the aerodynamic force (moment) ofevery single car. Three kinds of different distances while meeting are considered in order to analyze theeffects on dynamical property caused by different distances. And vibration acceleration and the securityindexes are concerned on the study of the vehicle dynamic characteristics.At last, different strategies of semi-active suspension are compared and the ceiling semi-active suspension is chosen. Then three kinds of control effects under different damping coefficients areobtained. By comparing the acceleration, velocity and displacement of every single car of thethree-connected-car model, the ceiling semi-active suspension is found to restrain the lateral vibration ofthe train effectively so that the vehicle dynamical performance is improved.