纵向耦合独立车轮转向架建模方法研究

根据多体系系统动力学理论,在建立动力学模型时,可将车轮间的动力学矢量设计成树形结构,这种处理使车轮间仅生成动力学约束而不是运动学约束。另一种方式将车轮间的纵向耦合方式视为无质量的运动约束,即车轮在连接点处具有相同的运动,运动矢量形成闭环。目前,在建立纵向耦合独立车轮转向架动力学模型时,都采用运动学约束来处理一侧前后车轮的耦合关系。以某COMBINO型纵向耦合独立车轮转向架为例,分别采用运动学约束和动力学约束的方法,对比曲线通过能力,以评价动力学约束方法的合理性。

On Longitudinal Coupling Modeling of Independent Wheel Bogie

According to the multi-system dynamics theory,in building a dynamic model,the dynamic vector between wheels could be designed into a tree structure,which generates only dynamic constraint rather than kinematic constraint.Another way of modeling the longitudinal coupling between wheels is a massless motion constraint,namely the wheels in connection with the same motion,and the motion vector forms a closed loop.At this stage,in building the longitudinal coupling bogie with independent rotating wheels,kinematics constraint is used to deal with the side wheels.In this paper,according to a COMBINO longitudinal coupling independent wheel bogie,the dynamic constraint is used and the rationality of the dynamic constraint method is expounded through a comparison with the curve passing capacity of the kinematics constraint method.