【作者】 张国忠；

【导师】 闫维明；

【作者基本信息】 北京工业大学 ， 结构工程， 2005， 硕士

【摘要】 磁悬浮系统是一种新型地面轨道交通系统,是21 世纪颇具竞争力的现代高速客运交通系统。我国作为一个铁路技术相对落后的大国,积极从事磁悬浮轨道交通系统及其相关技术的研究和开发,对实现我国交通系统的跨越式发展具有重要的意义。为实现高速客运,磁悬浮铁路系统大量采用了封闭式高架线路,而我国幅员辽阔,地震多发,因此对地震作用下磁悬浮车桥耦合振动及其控制技术进行研究是必要的。本文以德国Transrapid 高速磁悬浮列车为例,建立了高速磁悬浮列车与线桥动态相互作用模型,采用Newmark 二次迭代法编写了仿真程序;对磁悬浮列车以不同速度通过不同桥跨时车桥系统地震反应进行了数值模拟,研究了地震作用下,不同车速和不同桥跨对磁悬浮车-桥梁垂向耦合动力学系统的影响,得到了几点有意义的结果和结论: ①在不同地震波作用下,车体加速度都不满足限制0.5 的要求,但小于城际快速列车对车体垂向加速度限值1.23 的要求。m/ s2m/ s2②当跨径小于20m 时,轨道梁跨中最大加速度随跨径的增加而逐渐增加;当跨径大于24m 时,轨道梁跨中最大加速度随跨径的增加而逐渐减小;当跨径在20m—24m 时,轨道梁跨中最大加速度相对来说比较大。另外,轨道梁跨中位移随着跨径的增加而逐渐增加,但值都比较小。③在地震作用下,车速对磁悬浮车体最大加速度和轨道梁跨中最大加速度的影响不是很大。车速对轨道梁跨中最大位移的影响相对来说比较大,但都在规定的允许值范围之内。基于数值模拟技术,本文还分别探讨了轨道梁参数和车体参数以及综合参数对磁悬浮系统地震反应的影响。研究结果表明: ④合理控制轨道梁刚度比RB,有利于控制轨道梁的地震反应; ⑤二系悬挂参数比对车体地震反应有明显的影响,但对轨道梁地震反应无明显影响; ⑥控制综合参数,有利于控制轨道梁地震反应和车体地震加速反应。最后本文对两种计算模型的地震反应进行了分析比较,结果表明这两种模型的地震反应相差较大。其中,以轨道梁位移反应差别最大,高达百分之七十以上。更多还原

【Abstract】 Maglev system is a kind of new ground orbit transportation system, and it is the most competitive ability in modern high-speed passenger transportation system in the 21st century. But railway technique is very laggard in our country, so it is important for our country to actively engage in related research and development about Maglev transportation system, and then it is significant for our country to realize leaping development on our transportation system. In order to realize high-speed passenger transport, elevated guideway is applied widely in maglev railway system. But our country territory is broad, and earthquake often takes place. Therefore it is very necessary to research on the earthquake-excited vibration of a maglev vehicle bridge vertical couple system. In this paper, a high-speed maglev vehicle-bridge dynamic interaction model is established, based on the configuration of German Transrapid high-speed maglev system. Seismic responses of maglev vehicle-bridge system is simulated by the Newmark Twice Iteration emluator for different vehicle velocity and bridge span, The effects of a maglev vehicle-bridge vertical coupling dynamics are researched on earthquake for different vehicle velocity and bridge span, and several significative results and conclusions are obtained: ①Seismic acceleration of vehicle can not satisfy with limit 0.5 , but it is less than the vehicle vertical acceleration limit1.23 of the Inter City Express. m/ s2m/ s2②When span is less than 20m, the mid-guideway maximum acceleration increases gradually while span increases. When span is larger than 24m, it decreases gradually while span increases. When span is between 20m and 24m, it is greater relatively. Otherwise, the mid-guideway displacement increases gradually while span increases, but it is less. ③The effect of the earthquake-excited vehicle maximum acceleration of a maglev system and the mid-guideway maximum acceleration is not obvious for更多还原