Study on Characteristics of Railway Bogie Structural Vibrations under Train Running through a Switch
列车通过道岔时转向架结构振动特性的研究

The general train model, with three high-speed rolling-stocks and a track system, passing through a switch, is developed, considering the elasticity of the track foundation and modeling the bogie frames as elastic bodies. The excitations caused by a railway switch and the dynamic loads acting on a railway elastic bogie frame are simulated and analyzed. By the MBS-postprocessor FEMBS-l, these loads are transferred back to the FE-code, in which the stress distributions for the whole bogie are simulated by means of the ANSYS-code, high stressed locations are identified, and time histories for the stresses at the locations are simulated and analyzed. The simulating results of the train model and one rolling-stock model, including the time histories for the stresses in the bogie frame are compared with those obtained in the real field test. The frequency spectrums of the dynamic stresses show that the structural vibrations of the bogie frames in the train are different from those of one rolling stock. The dynamic tensile stresses and compressive stresses in the bogie frames while the train passing through a crossing vee are all higher in magnitude than those in a railway car. It indicates that the one rolling-stock model is only suitable for primary designs, calculations and analyses, while the train model should be adopted in order to analyze structural characteristics more accurately. According to the frequency spectrums of the dynamic stresses of bogie frames, frequency domain of the stresses may be divided into three vibration zones, that is, the first frequency zone corresponding to the stresses while train passing a curve, the second Corresponding to those while train passing through a crossing vee and turnout of switch, and the third corresponding to the natural eigenmodes of the elastic bogie frame.