落轴冲击下椭圆形支承块式轨道振动特性研究  

Research on vibration characteristics of elliptical support block track under wheel load drop

作　　者：唐吉意 罗雁云[1] 林龙锋 周力[1] 龙竞千 

机构地区：[1]同济大学铁道与城市轨道交通研究院,上海201804 [2]广州地铁设计研究院有限公司,广东广州510010

出　　处：《机械设计与制造工程》2017年第7期86-90,共5页Machine Design and Manufacturing Engineering

基　　金：国家自然科学基金资助项目(51678446)

摘　　要：为得到某新型支承块式轨道结构的振动特性,运用模型试验,研究了该新型支承块式轨道结构在落轴冲击作用下钢轨、支承块、道床及地面的振动特性,并进行了时域特性及频域特性分析。研究结果表明,钢轨的振动加速度远远大于支承块、道床及地面的振动加速度;振动由钢轨传递到地面的过程中,道床的振动加速度要比支承块及地面处的振动加速度大;线性计权下,钢轨、支承块、道床及地面的振动加速度级取值范围分别为115~160d B、98~126d B、100~123d B及95~121d B,钢轨、道床及地面的振动加速度级大体上随频率增大而增大;Z计权下,道床振动加速度级在3.15~80Hz范围内处于波动状态,地面振动加速度级在3.15~31.5Hz范围内大体上随频率增大而增大,在31.5~80Hz范围内随频率增大而减小。In order to obtain the vibration characteristics of a new type of supported block track structure,it analyzes a new supporting block track structure（ an elliptical supporting block track structure） under the impact of wheel load drop based on model test,describes the characteristic of some parts such as the rail,supporting blocks,track and ground,presents the characteristics in time domain and frequency domain. The results show that the vibration acceleration of rail vibration acceleration is far greater than the vibration of support block,track and ground; the vibration acceleration of the ballast bed is larger than that of the supporting block and the ground when the vibration transfers from the rail to the ground. Under linear weight,vibration acceleration level range of rail,support blocks,track and ground are respectively： 115 ~ 160 d B,98 ~ 126 d B,100 ~ 123 d B and 95 ~121d B; the vibration acceleration level of rail,track and ground generally increases with increasing frequency.Under Z weight,track vibration acceleration level fluctuates in the range of 3. 15 ~ 80Hz; the ground vibration acceleration level generally increases with increasing frequency in the range of 3. 15 ~ 31. 5Hz and decreases with the increasing frequency in the range of 31. 5 ~ 80 Hz.

关 键 词：模型试验 落轴冲击 振动特性 轨道结构 频域分析 

分 类 号：U213.3[交通运输工程—道路与铁道工程]