Vibration Reduction of C-type Spring Dynamic Absorbers for Elevated Track Box Girder
In order to effectively control the vibration of elevated track box girder,the physical model of track-box gird-er and dynamic vibration absorber was designed and established.Through theoretical calculation and numerical simulation,the frequency shift characteristics of the dynamic vibration absorber were analyzed,and its parameters,size and installation position were optimized.Then,the modal analysis of the track-box girder structure was carried out,and the controlled mode of the structure was determined by the modal contribution rate.Finally,based on the train-track-bridge coupling model,the vibration reduction effect of the dynamic vibration absorber on the track-box girder structure under train load was discussed.The results show that the dynamic vibration absorber can change the spring stiffness through the deformation of the C-type spring,and then change its natural frequency to control the vibration of different frequencies.According to the contribution rate of vibration mode,the track-box girder structure was designed with the second-order mode as the control mode.Under the action of harmonic load and moving load,the dynamic vibration absorber can effectively suppress the vibration of the track-box girder structure in a wide frequency range,with a maximum vibration reduction of 3.2 dB.
vibration and wavetrack box girdervibration controlC-type springdynamic vibration absorbermodal analysis
万方数据
维普
