Friction induced abnormal vibration under extreme conditions such as low speed and heavy load can greatly 〖JP2〗affect the stable operation of water-lubricated bearings in the propulsion shaft system of ships.The tribo-dynamics of water-lubricated bearings considering transverse vibration was studied.A mixed lubrication and hydrodynamic lubrication models for bearings affected by transverse vibration effects were established.The vibration characteristics of bearings in two states were analyzed.By substituting the coordinates under the balanced position of the journal into the lateral vibration model of the bearing,the disturbance amount of the journal was obtained.The influence of different excitation amplitudes on bearing friction was analyzed.The mechanism of friction induced vibration of water-lubricated bearings under elastic deformation was investigated.Research indicates that when the bearings come into contact,the lateral vibration has a significant impact on the friction force,leading to a non-linear change in the friction force of the bearings.Research results provide a basis for evaluating the impact of lateral vibration on friction and revealing the mechanism of bearing frictional vibration.