M TMD控制铁路轻型墩横向振动研究

RESEARCH ON TRANSVERSE VIBRATION CONTROL OF RAIL WAY LIGHT-PIER WITH MTMD

针对铁路提速后大部分轻型墩桥梁横向车桥耦合振动幅值超限问题,提出采用MTMD(Mu ltip le TunedM ass Damper)对其进行被动控制。首先将被控结构简化为单自由度体系,建立了结构-MTMD系统力学模型和运动微分方程,全面系统地分析了MTMD各设计参数对动力放大系数的影响规律。经分析可知,MTMD的频带宽度、阻尼比、质量比、中心频率比和TMD的个数对结构振动控制有重要影响,应对其进行优化。在此基础上,以一轻型墩特大桥为例设计MTMD,并对采用MTMD控制铁路轻型墩横向车桥耦合振动的效果进行了分析。

When the travelling speed of railway trains is raised up,the transverse vibration amplitud of majority of light pier bridges will exceed the allowance value.For the sake of controlling the transverse vibration of light pier bridges,the measure with MTMD(Multipe Tuned Mass Damper) is proposed.Taking the structure as a single-degree of freedom system,the calculating model of structure-MTMD system is developed and the motion differential equation is derived.The influence of MTMD parameters on dynamic magnification factor are fully analyzed.The results show that the width of(frequency) band,the damping ratio,the mass ratio,the center frequency ratio and the total number of TMD have very(important) effect on structural vibration control.Therefore,it is necessary to optimize these parameters.Then based on the conclusion,MTMD for a light pier bridge is designed and the control effect of MTMD on the transverse vchide-bridge coupled(vibration) is analyzed.