| With the development of economy, ballastless track for high speed has made a great progress in these years. The application of ballastless track in subgrade has appeared successively in Germany and JaPan, so does in our country. However, the subgrade elastic-plastic characteristics becomes the bottleneck of the development for longitudinal continuous ballastless track. It is necessary to do some further researches on the subgrade vehicle-track coupling vibration characteristic.The dynamics research on longitudinal continuous ballastless track is relatively less at home and abroad, and the time domain analysis methods are adopted in most researches, which cannot fully reflect the vibration characteristics. In this Paper, the vehicle-track-subgrade model is made on the basis of longitudinal continuous ballastless track of CRTSII and locomotive of CRH2by choosing appropriate structure Parameters, using the frequency domain method and analyzing the characteristic of vibration system. The evaluation indexes are obtained according to the vibration natural frequency distribution and vibration model structural response on frequency change.Based on the analysis of the vibration characteristics,we make a furthermore analysis of the influence of System vibration characteristics such as fastener stiffness, mortar layer elastic modulus, support layer elastic modulus and foundation settlement. Research shows thatthe change of mortar layer modulus of elasticity only have certain effect on the vibration of the rail board;Support layer modulus of elasticity change have little influence on rail and rail structure; The value of fastener stiffness directly affects the train operation comfort and the resisting power of the structure under rail; The emergence of the foundation settlement and exPand have large influence on subgrade-track-vehicle system vibration.Particularly significant on vibration of the structure under rail. |
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