摘要
采用有限元法模拟高速列车车厢在三种等速(250 km/h、350 km/h和500 km/h)明线交会时产生的压力波作用下的动态响应过程,得到侧窗中心Mises应力随时间的变化曲线,并与相同幅值变化的均布动载及最大静载两种工况进行对比。结果表明同节车厢各个侧窗中心所达到的最大应力值表现出沿载荷移动方向随侧窗位置不同逐渐增加的趋势。当交会速度较低时,在均布动载荷作用下计算得到的侧窗中心应力峰值均高于静载和移动压力波的情况;而随着交会速度的提高,在移动压力波作用下的侧窗应力峰值高于其他两种情况。在等速交会速度为500 km/h时,车厢各个侧窗瞬时挠度在压力波第二个峰值到达时表现出混乱。研究表明在高速列车交会时的车窗安全性评估中必须考虑移动压力波的影响。
Dynamic processes of a carriage loaded by air pressure pulses generated as high-speed trains passing each other at three constant velocities （250 km/h, 350 km/h and 500 km/h） are simulated with a finite element method. The variations of yon Mises stress at side window centers with time are obtained and compared with the results of the maximum static load or the uniform dynamic load with the same amplitudes as that of the air pressure pulse. Results show that the maximum yon Mises stress of side windows located at the rear of the carriage is larger than that at the front when the load on side window center reaches its positive or negative peak values. When the traveling velocity of trains is lower, the peak von Mises stresses of side window centers calculated under uniform dynamic load are higher than those of the other two loading situations. As the velocity increases, the peak von Mises stresses of side window centers resulted by the moving air pressure pulse exceed those calculated under uniform dynamic load. The von Mises stresses caused by the static load are the lowest. When the traveling velocity of trains is 500 km/h, the instant displacements of side windows are not linear to the amplitudes of the loads when the negative peak value of air pressure pulses arrives. Hence, the influence of air pressure pulse caused by high-speed trains passing each other must be considered when elevating the safety of side windows.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第9期30-36,共7页
Journal of Mechanical Engineering
基金
国家重点基础研究发展计划(973计划
2011CB711102)
中国科学院创新工程方向项目(KJCX2-EW-L03)资助项目
关键词
列车交会
压力波
侧窗
应力峰值
弯曲波
Trains passing each other Air pressure pulse Side window Von Mises stress Flexural wave
