基于车桥耦合振动原理,将车桥振动系统分为车辆和桥梁2个振动子系统,分别采用达朗贝尔原理和动力有限元方法建立了4自由度汽车模型和桥梁模型的振动方程,通过车轮与桥梁接触点处的几何相容条件和静力平衡条件建立起两者之间的联系,采用Newmark-β法实现了对方程组的分组迭代求解。对一座简支梁桥进行了车桥耦合振动影响因素分析。 Based on the theory of the coupling vibration of the axle and the axle, the vibration system of the axle is divided into two vibration subsystems of the vehicle and the bridge. The vibration equations of the four-degree-of-freedom automobile model and the bridge model are established respectively by using the principle of Dalembert and the dynamic finite element method. And the geometrical compatibility conditions at the contact point with the bridge and the static equilibrium condition, the Newmark-β method is used to solve the group iteration of the system of equations. The analysis of the factors affecting the coupling vibration of a simply supported beam bridge.