【摘要】 磁浮轨道梁动力特性是磁浮关键技术研究中的重要内容,该方面的研究一直以来备受结构工程界的关注。结合已有研究成果,建立了悬浮模块与轨道梁动力相互作用模型,考虑主动控制的电磁力特性,对一系列悬浮模块在轨道梁上移动引起的动力响应进行数值仿真计算,分析了轨道梁阻尼比、跨数、重量和列车运行速度对轨道梁变形特性的影响规律。分析结果表明:结构阻尼对梁系统动力特性影响较小;基频不变的条件下,简支梁质量变化对梁动力系数的影响很小;随着速度提高,冲击系数总体上呈波动上升趋势,但在正常运行速度下并未出现明显的共振现象。本文的研究结论为轨道梁合理设计参数的选取提供了理论依据。更多还原

【Abstract】 As an important part of key technologies of maglev system,the dynamic response of guideway girders has attracted much attention from researchers in structural engineering.Based on available existing research results,a suspension magnet-guideway dynamic model is established,with the dynamic characteristics of magnet-rail relationship under active control considered.A numerical simulation is performed,using the model,to investigate the dynamic responses of the magnet and the guideway,and the effects of guideway girder parameters(e.g.,damping ratio,number of spans and weight) and train velocity on the deformation of the girders are analyzed.The results indicate that damping ratio has little influence on the dynamic response of the system.If the basic frequencies of girders are similar,mass change has little influence on the dynamic coefficients of single span girders.The coefficient of impact follows a fluctuating ascending trend,but resonance vibration is not significant within the range of normal running speed.更多还原