Theoretical Study On Vibration Damping Performance Of Floating Plate Track Based On Electromagnetic Eddy Current Inertial Damper

With the rapid development of social economy and the increasing urban population,urban rail transit as a fast and convenient way of public travel has greatly met the needs of residents,but a series of vehicle-induced environmental vibration problems has also become increasingly serious.As a vibration reduction measure with excellent vibration damping effect,steel spring floating plate track has been widely used in rail system vibration damping in major cities.Although the steel spring floating plate track can better isolate the medium and high frequency vibrations,the vibration damping effect in the low frequency range is not ideal.Therefore,in order to improve the vibration damping effect of the steel spring floating plate track in the low frequency range,two new dampers,such as the electromagnetic eddy current inertia damper of the duplex rotor and the comb toothed cup electromagnetic eddy current inertia damper,are proposed,and the vibration damping effect of these two new dampers on the steel spring floating plate track is studied.The main contents and achievements of this paper are as follows:(1)A duplex rotor electromagnetic vortex inertial damper with permanent magnets arranged in both directions of diameter and axis is proposed,and a finite element model of the damper is established by COMSOL software to analyze the damping and magnetic field coupling characteristics of the damper;then the force-velocity nonlinear characteristics of the duplex rotor electromagnetic vortex inertial damper are compared and analyzed based on three models: Wouterse mathematical model,modified Wouterse mathematical model and Anwar mathematical model,and the modified Anwar mathematical model is proposed,and the modified Anwar mathematical model is found to have a higher fitting accuracy.Finally,a parametric analysis of the main structural and magnetic characteristic parameters affecting the mechanical performance of the duplex rotor electromagnetic vortex inertia damper was carried out,and the variation law of the axial electromagnetic vortex damping force with each parameter was obtained.(2)A comb-tooth cup electromagnetic vortex inertial damper based on the radial multiple arrangement of permanent magnets is proposed,and the corresponding finite element model is established by COMSOL software to analyze the high damping density characteristics and hysteresis characteristics of the damper;then the force-velocity nonlinear characteristics of the comb-tooth cup electromagnetic vortex inertial damper are fitted and analyzed by Wouterse mathematical model,and the proposed modified Wouterse mathematical model is found to have better fitting effect.The proposed modified Wouterse mathematical model is found to have a better fitting effect;finally,the main structural and magnetic parameters affecting the mechanical performance of the comb-tooth cup-type electromagnetic vortex inertial damper are analyzed,and the variation law of the axial electromagnetic vortex damping force with each parameter is obtained.(3)The dynamic response of the single-degree-of-freedom system under simple harmonic load is analyzed,and the analytical solution of the single-degree-of-freedom system is derived;then the dynamics of the single-degree-of-freedom system with the introduction of a double Irotor electromagnetic vortex inertial damper and a comb-tooth cup electromagnetic vortex inertial damper are developed,and the damping performance of the two new dampers is compared and analyzed;finally,the two new dampers are applied to the steel-spring floating plate Finally,the two new dampers were applied to the steel-spring floating plate track,and the damping effect of the two new dampers on the floating plate track was studied.The results show that the double I-rotor electromagnetic vortex inertia damper and the comb-tooth cup electromagnetic vortex inertia damper has good control effects on both the single degree of freedom system and the floating plate track system in the low frequency range,but the former damping control effect is better than the latter.