摘要
在高速运行的条件下,当列车达到某种速度时,列车将引起轨道和大地的强烈振动。本文通过建立轨道振动微分方程,得到单轮作用下轨道变形的解析表达式。在此基础上,利用叠加原理,研究轨道临界速度与单轮和高速列车诱发轨道强振动的关系,分析了轨道基础弹性模量和轨道抗弯刚度对轨道临界速度及轨道振动的影响。计算表明,轨道基础弹性模量是影响轨道临界速度的主要原因。尤其是当轨道基础为软土地基时,轨道临界速度很低,容易被中高速列车超过。当列车速度接近轨道临界速度时,轨道将发生强烈振动。分析还显示当列车速度低于轨道临界速度时,提高轨道抗弯刚度对减小轨道振动的作用并不明显,但当列车速度接近轨道临界速度时,增加轨道抗弯刚度对减小轨道振动的作用则非常显著。
A train will induce the track and strong ground vibration when the train speed. The analytical formula of track deformation under a single wheel load has been deduced by establishing the track vibration differential equation. By use of this formula and the superposition principle, the relationships between track critical velocity and track vibration boom induced by a single wheel load and high speed trains are investigated and the influences of the Young＇s modulus of the track foundation and the flexural rigidity of the track on track critical velocity and track vibration are discussed. The computations show that the Youngs modulus of the track foundation is the principal cause of the track critical velocity. The track critical velocity is especially low for the soft subgrade of track foundation, which may be easily exceeded by moderate and high speed trains. Track vibration boom will be generated when the train travels at the speed of approaching the track critical velocity. The results also demonstrate that raising the flexural rigidity of the track may reduce track vibration significantly when the speed of the train is near to the track critical velocity. However, there is little effect on depressing track vibration when the speed of the train is lower than the track critical velocity.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2006年第3期78-82,共5页
Journal of the China Railway Society
基金
国家自然科学基金(50568002)
关键词
轨道振动
轨道临界速度
轨道强振动
高速列车
track vibration
track critical than the track critical velocity. velocity
track vibration boom
high speed train
