西南交通大学学报2025，Vol.60Issue(4)：823-832,10.DOI:10.3969/j.issn.0258-2724.20240381
桥梁参数对磁浮系统车-桥耦合稳定性的影响
Influence of Bridge Parameters on Vehicle-Bridge Coupling Stability of Maglev System
摘要
Abstract
To solve the self-excited vibration problem during vehicle-bridge coupling in the maglev transportation and guide maglev bridge design,a mathematical model of the bridge was established based on the modal analysis method,so as to study the influence of the bridge parameters on the stability of the vehicle-bridge coupling in the maglev system.Firstly,by taking a stretched overpass in a maglev project as an example,the mathematical model of the overpass with elastic support structures was established using the modal analysis method,and the influence of the pier position on the modal frequencies of the overpass was studied.Secondly,according to the levitation control system model of the maglev train,the vehicle-bridge coupling system model was established.Then,the causes of self-excited vibration were studied by analyzing its open-loop frequency characteristics.Finally,the effects of parameters,including the first-order modal frequency of the overpass,the span,the damping ratio,and the line density on the stability of vehicle-bridge coupling were discussed.The results show that when the first-order modal frequency of the overpass is close to or higher than the critical levitation frequency,the closed loop may be unstable.Therefore,a light bridge with the first-order modal frequency of above 10 Hz is more likely to induce self-excited vibration during vehicle-bridge coupling;long-span bridges have lower modal frequencies and gains and are more stable than short-span bridges;a smaller damping ratio and line density of the overpass mean wider unstable frequency range;compared to girders with supports at both ends,under the fixed bridge length and cross-section,the first-order modal frequency of the stretched bridge shows a trend of first increasing and then decreasing as the span decreases,with the maximum frequency exceeding 53.9%,which makes it more likely to fall into the unstable frequency range.Therefore,the short-span stretched bridges should be excluded from maglev projects as much as possible.关键词
磁浮列车/车-桥耦合/振动/桥梁/参数Key words
maglev train/vehicle-girder coupled/vibration/girder/parameters分类
信息技术与安全科学引用本文复制引用
周丹峰,朱鹏翔,屈鸣鹤,王连春,李杰..桥梁参数对磁浮系统车-桥耦合稳定性的影响[J].西南交通大学学报,2025,60(4):823-832,10.基金项目
国家自然科学基金项目(52332011) （52332011）
