动力稳定车-道床-桥梁系统横向动态特性分析  

Lateral Dynamic Characteristics Analysis of Dynamic Stable Vehicle-Ballast Bed-Bridge System

作　　者：陈佳明 王立华[1] 宿晓航 CHEN Jiaming;WANG Lihua;SU Xiaohang(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院,昆明650500

出　　处：《铁道标准设计》2021年第9期84-88,93,共6页Railway Standard Design

基　　金：国家自然科学基金项目(51765023)。

摘　　要：针对铁路桥梁有砟道床,研究不同道床工况和动力稳定车不同激振频率对轨枕横向动态响应的影响,以及轨枕在不同桥梁工况横向动态响应的区别。首先,运用集中参数法建立动力稳定车-道床-桥梁系统模型,依据模型推导出系统横向运动方程;其次,利用MATLAB软件和数值积分法编写模型求解程序;最后,根据道床状态的不同,选取3种不同道床工况对系统进行数值求解。另外,根据不同桥梁规模,选取2种不同桥梁工况对系统进行数值求解。研究结果表明:道床在稳定车作业1.5 s后达到稳定;激振频率增大,不同道床工况下轨枕横向动态响应变化趋势相同,但当道床横向刚度阻尼增大时,轨枕横向位移和速度响应变小,而横向阻力响应均值变大;在不同桥梁工况作业时,桥梁横向刚度阻尼越大,轨枕横向位移越小,且所需最优激振频率越大。3种道床工况下,桥梁上动力稳定车作业最优激振频率为36 Hz;不同铁路桥梁工况动力稳定车最优激振频率不同,2种桥梁最优激振频率分别为31 Hz和36 Hz。Aiming at the ballast bed on the railway bridge,this paper studies the influence of different ballast bed working conditions and different excitation frequencies of dynamic stable vehicle on the lateral dynamic response of sleepers,and the difference in the lateral dynamic response of sleepers under different bridge conditions.First,the lumped parameter method is used to create a dynamic stable vehicle-ballast bed-bridge system model,and the system's lateral motion equation is derived based on the model.Secondly,MATLAB software and numerical integration are applied to write the model solving program.Finally,three different ballast bed conditions are selected to numerically solve the system according to different conditions of the ballast bed.In addition,two different bridge conditions are taken to numerically solve the system based on different bridges.Research results show that the ballast bed becomes stabile after 1.5 s of dynamic stable vehicle operation;as the excitation frequency increases,the sleeper's lateral dynamic response under different ballast bed conditions tends to be the same,but when the ballast bed's lateral stiffness and damping increase,the sleeper's lateral displacement and velocity response become smaller,and the average value of the lateral resistance response becomes larger;in different bridge operations,the greater the lateral stiffness and damping of the bridge,the smaller the lateral displacement of the sleeper,and the greater the optimal excitation frequency required.Therefore,it can be seen that the optimal excitation frequency of dynamic stable vehicle operation on the bridge is 36 Hz under the three conditions of ballast bed.The optimal excitation frequencies of the dynamic stable vehicle under different railway bridge conditions are different,and the optimal excitation frequencies of the two bridges are 31 Hz and 36 Hz respectively.

关 键 词：铁路桥梁 有砟道床 道床工况 动力稳定车 激振频率 数值积分法 

分 类 号：U216.6[交通运输工程—道路与铁道工程]