Modeling And Simulation Of Rail Vibration Absorber Considering Vehicle Track Coupling

During the operation of rail vehicles,due to the limited rail damping and common track irregularities,the wheel-rail force will increase sharply,which will cause high-frequency vibration of the rail.This produces severe vibration noise and has a certain impact on the service life of the rail.Therefore,research on suppressing high-frequency vibration of rails is urgently needed to mitigate vibration noise and prolong the service life of rails.This paper takes reducing the vertical vibration of the rails and mitigating the vibration noise as the purposes,using the two schemes of designing optimal sleeper spacing on specific lines and installing multi-vibrator dynamic vibration absorbers on both sides of the rail waist to conduct in-depth research on controlling vertical vibration of urban rail transit rails:(1)In order to analyze the effect of the sleeper spacing on the vertical vibration of the rail,the vertical vibration response of the rail is solved in the vehicle-track vertical coupling model.The effects of vehicle speed and load on the vertical vibration response of the rail under different sleeper spacings are analyzed,and the importance of the vehicle system to the sleeper spacing research is pointed out.According to the power spectrum evaluation index of the vertical displacement of the rail,a proposal for the optimal sleeper spacing under a specific line is proposed,and the vibration decay rate was used to verify the optimal sleeper spacing.The research results show that: at low speed sections,the sleeper spacing has a small effect on the rail vibration,and a larger distance can be appropriately selected to save the laying cost;at high speed sections,the sleeper spacing has a large impact on the rail vibration,and a suitable spacing value should be designed in consideration of speed and load.(2)In order to reduce the high-frequency vertical vibration of the rail,a theoretical model of vehicle-track-rail absorber coupling model was established,and the vertical vibration response characteristics of the rail at typical locations in the coupling model and the rail model were compared.According to the two evaluation indicators of the vibration response at the peak frequency and the root mean square value in the frequency band,the limitations of the single-vibrator absorber in the mid-frequency band are prone to increase;The general steps of parameter design of the double-vibrator absorber are presented,and the vibration reduction advantages of the double-vibrator absorber are analyzed;The effectiveness of the design method is verified by using the vibration attenuation rate under multiple speed lines.The results show that the vibration reduction energy of the single-vibrator absorber is concentrated at a specific frequency,and the vibration reduction effect is good.The double-vibrator absorber separates the mass of the vibrator,so that the vibration damping energy is distributed in a wide range,which can achieve better broadband vibration reduction effects.(3)In order to obtain the optimal number of vibrators for rail dynamic vibration absorbers,a vehicle-rail-multi-vibrator dynamic vibration absorber coupled vibration model was established.Under the conditions of full speed and full load,the selection of the number of metal vibrators of a rail multi-vibrator dynamic vibration absorber is studied,and the vibration reduction effect of the vibration absorbers under different numbers of metal vibrators is compared.The vibration decay rate of the rail was used to verify the vibration damping performance of the three-vibrator dynamic shock absorber.In addition,the embedded metal vibrator dynamic vibration absorber structure designed close to both sides of the rail of the rail is designed,and the installation and connection scheme of the vibration absorber and the choice of materials are proposed.The results show that the three-vibrator dynamic vibration absorber can achieve the best wide-band vibration reduction effect.Under full speed and full load conditions,the vibration decay rate of the rail sleeper and between the two sleepers is improved,and the vertical vibration of the rail is significantly suppressed.