非线性变参数车-轨-桥耦联系统动力学建模

Dynamic Simulation of Vehicle-rail-bridge Coupled System with Nonlinear and Varying Parameters Supporters

考虑车辆-轨道-桥梁间的非线性刚度和阻尼特性,建立系统在垂向和横向轨道不平顺条件下的动力学模型。将车辆模拟为质量-弹簧-阻尼多刚体系统,轨道和桥梁则分别为由有限个变参数弹性约束相联系的欧拉梁,利用分段线性化方法描述弹性约束的非线性刚度和阻尼特性,数值求解系统的动力学响应。研究表明:系统间的非线性变参数约束对改善结构的动力性能有着重要的影响,特别是对于拉压不对称的非线性约束情形,系统则表现出良好的综合动力性能。

This paper presents a dynamic simulation of vehicle-rail-bridge coupled system with rail irregularities in horizontal and vertical orientations. Nonlinear properties of springs and dampers between rail and bridge are considered. The rail and bridge are taken as Euler beams with a number of nonlinear and varying parameters bounds respectively. The nonlinear characteristics of springs and dampers are modeled by piecewise-linear method. Numerical simulations are per-formed and the dynamic responses of vehiele-rail-bridge coupled system are discussed. From this investigation, it can be concluded that there would be a good effect of nonlinear springs and dampers on suppressing the dynamic responses of vehicle-raiLbridge system in contrast with that of linear ones.