跨座式轻轨车与连续轨道梁空间振动分析

Dynamic analysis of a coupled system of a monorail train of straddle type and a continuous track beam

提出了一种跨座式轻轨车与连续轨道梁空间耦合振动时域分析方法。桥梁采用常规有限单元模拟,跨座式轻轨车采用弹簧阻尼相连的多刚体模拟,可方便考虑走行轮、导向轮、稳定轮下轨道不平顺的影响,直接建立轻轨车-桥梁时变系统的空间振动方程,采用直接积分法同时求解轻轨车、桥梁的空间动力响应,并编制了相应的计算分析程序。以一联3×30m的双线连续轨道梁为例,计算了轻轨车以不同车速通过双线轨道梁时全过程车桥动力响应。探讨了不同车速、单线行车、双线对开等不同工况对车桥动力响应的影响。计算结果表明:在设计行车速度下,轻轨车可安全舒适通过该连续轨道梁;桥梁具有良好的整体刚度。该方法可运用于跨座式轻轨车与其它大跨度桥梁的空间振动分析。

An approach for dynamic analysis of a coupled monorail train-bridge system in time domain was presen-ted.The bridge was represented by conventional finite elements while the monorail train was idealized as a combination of a number of rigid bodies connected by a series of springs and dampers which could easily take the effect of lateral and ver-tical surface roughness at driving,steering and stabilizing wheels into consideration.The governing equation of motion for the monorail train-bridge was formed on the basis of the bridge dynamic equation and was assembled adopting a fully computerized approach.Direct integration method was used to solve the equation.A case study of a 3×30 m double-line con-tinuous track beam was analysed.Effects of driving speed and different conditions on the coupled system as well as impact coefficient were discussed.The results demonstrated that the proposed framework could efficiently predict the dynamic re-sponse of the coupled monorail train and bridge system and the train could safely and comfortably go through the double-line continuous track beam with the designed speed.