梯式轨枕轨道模态试验分析  

ANALYSIS OF MODAL TEST OF THE LADDER TRACK

作　　者：金浩[1] 刘维宁[1] 王文斌[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国铁道科学研究院,北京100081

出　　处：《工程力学》2013年第3期459-463,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(51008017);北京交通大学博士生创新基金项目(2011YJS261);中央高校基本科研业务费专项基金项目(2012YJS072)

摘　　要：梯式轨枕轨道已成为控制地铁列车振动的有效措施之一,但枕下减振垫板的铺设形式如何影响梯式轨枕轨道的动力性能尚没有展开系统研究。该文通过多输入多输出模态测试方法,分析了枕下减振垫板的三种铺设方式对梯式轨枕轨道动力特性的影响。分析得出:现有的枕下减振垫板铺设方式,具有最小的一阶自振频率33Hz。单侧铺设10块枕下减振垫板的梯式轨枕轨道,具有最大的一阶阻尼比4.2%。三种枕下减振垫板铺设方式,梯式轨枕轨道前6阶阻尼比都具有先减小后增大的规律,一阶振型都沿轨道中心线对称。单侧铺设5块和7块枕下减振垫板的梯式轨枕轨道,二阶振型都沿轨道中心线反对称,和单侧铺设10块枕下减振垫板的梯式轨枕轨道正相反。分析结果为梯式轨枕轨道的工程应用提供了参考。The ladder track was one of the best methods to control train-track vibrations. But the laying type of damping pads under sleepers had not been researched systematically. According to the MIMO （multiple input multiple output） method, three laying types of damping pads under a sleeper were analyzed how to affect the dynamic characteristics of the ladder track. Results show that the former laying type of damping pads has the smallest natural frequency （33 Hz）. The ladder track with 10 damping pads （side） has the biggest damping ratio （4.2%）. First six damping ratios of the ladder track of three laying types have a down-up manner and the first modal shape is symmetric along the centerline of the ladder track. The second modal shape of the ladder track with 5 and 7 damping pads （side） is antisymmetric along the centerline of the ladder track, contrary with the ladder track with 10 damping pads （side）. The analysis provides an engineering reference for the ladder track application.

关 键 词：梯式轨枕轨道 模态试验 自振频率 阻尼比 振型 

分 类 号：U231.2[交通运输工程—道路与铁道工程]