Simulation and Analysis of Coupled Vibration of Monorail Train-bridge-road Vehicle System

A space dynamic analysis model of monorail train-bridge-vehicle coupled vibration system is established,in which the monorail train and road vehicles are idealized as the combination of a number of rigid bodies connected by a series of springs and dampers. The degree-of-freedom(DOF) of a car in monorail train is 15,and that of a road vehicle is 13 for 2-axle car or 17 for 3-axle car. Bridges are considered as an assemblage of beam elements with 6 DOFs at each node and link elements with 3 DOFs at each node. The contact between the bridge and the moving vehicle and train is assumed to be a point contact. Based on the displacement corresponding relationship of bridge and vehicle,the equations of motion of the coupled monorail train-bridge-road vehicle system are introduced. A numerical algorithm is then proposed for solving the nonlinear dynamic equations of the coupled system. A corresponding computer code is developed to get the dynamic response of the full bridge and trains and vehicles. With an actual bridge as an example, the dynamic responses of the bridge and riding comfort indexes of the trains and the vehicles are evaluated. The results show that the bridge is safety,and the proposed analysis model and the solution method are feasible.