多重调谐质量调谐阻尼器的磁浮道岔减振方案

Damping Method for Maglev Transit Switches Based on Multiple Tuned Mass Damper

研究目的:对于如长沙磁浮工程已经通车的道岔,道岔结构竖向振动加速度达2. 37g以上,均远超过规范规定的无砟轨道地段不应大于0. 5g,影响道岔使用寿命、车辆寿命及旅客舒适度,需要测试分析振动超标产生原因,寻求减振方案,既要使振动满足不大于0. 5g要求,又要尽可能少增加道岔梁质量影响道岔梁转动速度。研究结论:(1)经测试分析,长沙磁浮工程道岔梁振动为车轨共振,可采用减振器消能减振;(2)磁浮列车不同于轮轨列车,受电磁悬浮控制系统影响,列车自振频率存在一定波动,采用多重调谐质量调谐阻尼器(TMD)的方式控制一定激振频率带的振动,达到控制频率能全覆盖;(3)采用模糊控制理论的多重调谐质量调谐阻尼器(TMD)适用于处理所有因共振引起的结构振动超标。

Research purposes:For the turnout of Changsha Maglev Project,the vertical vibration acceleration of the turnout structure is more than 2.37 g,which is far beyond the ballastless track allowable value in the code.This may cause harmful effect to the service life of the turnout and the vehicle,influences the comfort of passengers.It is necessary to test and analyze the causes of vibration exceeding the standard,and seek the vibration reduction method,so that the vibration can not only meet the requirement of less than 0.5 g,but also increase the quality of turnout beam as little as possible which affects the turnout pulling speed.Research conclusions:(1)The vibration of the turnout beam of Changsha Maglev Project is train-rail resonance,which can be absorbed by vibration absorber.(2)Maglev train is different from wheel-rail train,because of the influence of electromagnetic levitation control system,the natural frequency of train fluctuates,the vibration of certain excitation frequency band can be controlled by multiple tuned mass damper(TMD),and the control frequency can be fully covered.(3)The multiple tuned mass tuned damper(TMD)based on fuzzy control theory is suitable for handling all structural vibration caused by resonance.