摘要
为研究高速磁浮列车运行引起的动力学问题,建立了考虑墩体作用在内的高速磁浮系统动力分析模型,通过对有限元梁墩体系模型采用模态综合技术,建立高速磁浮列车和轨道梁体系运动方程组。以24m跨度简支混凝土复合梁为例,计算分析了梁墩体系自振特性及高速磁浮列车作用下动力响应特点。研究表明：墩高小于6 m时,墩体质量变化对结构自振特性影响不大;随着列车速度的逐渐增大,轨道梁跨中最大垂向位移逐渐增大,桥梁的垂向位移主要受列车重力荷载控制,轨道梁在运行速度0~600 km/h范围内无明显共振现象;当运行速度超过250 km/h后,列车垂向舒适性恶化较为明显。
In order to study dynamic response of high-speed maglev system,a high-speed maglev train/guideway dynamic model considering pier vibration is established in the thesis.By using 20 modal synthesis technology on guideway-pier finite model,high-speed maglev train/guideway system motion equations are established,and calculation analysis programmer is written.A 24 m span single-branch concrete compound beam is made for example;natural vibration and the dynamic response of the guideway/pier system are calculated and analyzed.The results show that： pier mass makes nearly no effect on characteristic of natural vibration with pier height h6 m.The 25 midspan vertical displacement of guidway increases gradually with the increment of train’s speed,and the vertical displacement mainly controlled by gravity loading.The vertical resonant of guideways doesn’t happen when the speed is under 600 km/h.The vertical comfort of train deteriorates significantly with the train velocityv250 km/h.
基金
高等学校博士学科点专项科研基金资助项目(20090009120020)
国家自然科学基金资助项目(51008018)
关键词
铁路运输
高速磁浮交通
轨道梁
列车
动力响应
自振
railway transport
high speed maglev
guidway
train
dynamic response
natural virbration
