调频式钢轨阻尼器安装偏差对钢轨振动衰减率的影响  

Effect of Installation Error on Decay Rate of TRD

作　　者：李政 杨龙才[1,2] 周新 赵磊 金浩 LI Zheng;YANG Longcai;ZHOU Xin;ZHAO Lei;JIN Hao(The Key Laboratory of Road and Traffic Engineering,Ministry of Education,Shanghai 201804,China;Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety,Shanghai 201804,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]上海市轨道交通结构耐久与系统安全重点实验室,上海201804 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《铁道建筑》2020年第3期127-131,共5页Railway Engineering

基　　金：国家重点研发计划(2017YFB1201204)。

摘　　要：为提高调频式钢轨阻尼器的减振降噪作用,本文基于谱元法建立简化计算模型,推导出钢轨单元的谱传递矩阵,再用BLOCH定理计算出钢轨振动衰减率。通过计算安装调频式钢轨阻尼器前后钢轨的振动衰减率,分析调频式钢轨阻尼器对钢轨振动衰减率的影响,并计算对比调频式钢轨阻尼器安装偏差的影响。结果表明:调频式钢轨阻尼器能大幅度提高自身工作频率附近的振动衰减率,在300,1 700 Hz附近均出现新的带隙,且钢轨一阶Pinned-pinned共振频率附近的带隙被拓宽,相应的衰减率峰值也得到提高;调频式钢轨阻尼器安装偏差会对500 Hz以上高频部分的振动衰减率产生影响,对500 Hz以内的几乎不会产生影响。To promote the vibration and noise reduction of tuned rail damper(TRD),a model is built based on spectral element method.The spectra transmission matrix of the steel track elements is deduced,and the vibration decay rate is calculated with BLOCH theorem.With the calculation of track vibration decay rate before and after the installation of TRD,the effect of TRD on track vibration decay rate is analyzed.Also,the influence of installation error is studied.It shows that the TRD can greatly improve the vibration decay rate near its operating frequency.A new band gap appears near 300 Hz and 1 700 Hz.The band gap near the first order Pinned-pinned resonance frequency of the rail is widened,and the corresponding decay rate peak is also improved.The installation position of the TRD will have an impact on the vibration decay rate,which is mainly reflected in the high frequency part above 500 Hz.For the decay rate within 500 Hz,the installation position of the TRD will have little impact on it.

关 键 词：城市轨道交通 调频式钢轨阻尼器 数值模拟 振动衰减率 谱元法 安装偏差 减振降噪 

分 类 号：U231[交通运输工程—道路与铁道工程]