滞变阻尼对周期轨道结构垂向振动带隙特性影响  

Effect of Hysteresis Damping on Vertical Vibration Band Gap Characteristics of Periodic Track Structure

作　　者：洪显 郭文杰 戴承欣 Hong Xian;Guo Wenjie;Dai Chengxin(School of Transportation Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学交通运输工程学院,江西南昌330013

出　　处：《华东交通大学学报》2023年第1期82-91,共10页Journal of East China Jiaotong University

基　　金：江西省自然科学基金面上项目(20224BA204069);江西省博后科研择优资助项目(2021KY25);江西省教育厅科技项目(GJJ2200629)。

摘　　要：为探究滞变阻尼对周期轨道结构带隙的影响,以我国有砟轨道为例,基于能量泛函变分原理分析其带隙特征。通过将滞变阻尼效应引入钢轨、扣件和道床中,研究了周期性有砟轨道的频散特性随阻尼的变化情况。进一步地,研究了阻尼作用下轨道结构的振动传输特性。结果表明:无阻尼轨道结构的带隙范围与振动响应的衰减范围一致;钢轨阻尼很小且对轨道结构带隙几乎没有影响,在计算和预测振动时可以忽略;扣件的阻尼会略微增加轨道结构带隙,对带隙整体影响不大,但对于振动响应,扣件阻尼的耗散作用会增加150~500 Hz内振动衰减范围;道床阻尼增大会增加第一阶带隙范围,但会减小第二阶带隙范围,在振动响应中,增大道床阻尼能够使260 Hz内的钢轨振动均发生衰减。In order to explore the effect of hysteresis damping on the band gap of periodic track structure,the ballasted track of was taken as an example,and the band gap characteristics were analyzed based on the energy functional variational principle.By introducing hysteretic damping effect into rails,fasteners and track bed,the variation of dispersion characteristics with damping of periodic ballasted track was studied.Furthermore,the vibration transmission characteristics of the track structure under the effect of damping were explored.The results show that the band gap range of the undamped track structure is consistent with the attenuation range of the vibration response;the rail damping is very small and has little effect on the band gap of the track structure,which can be ignored when calculating and predicting vibration;the damping of the fasteners slightly increases the track structural band gap and has little effect on the overall band gap,but for the vibration response,the dissipation effect of the fastener damping increases the vibration attenuation range within 150~500 Hz;the increase of the ballast bed damping increases the first-order band gap range,but it decreases the second-order bandgap range,in the vibration response,increasing the damping of the track bed can dampen the vibration of the rail within 260 Hz.

关 键 词：滞变阻尼 周期结构 有砟轨道 带隙 传输特性 

分 类 号：U213.2[交通运输工程—道路与铁道工程]