Distributed-friction induced vibration in the shafting system
CHE Kai-kai1,2，ZHANG Zhen-guo1,2，ZHANG Zhi-yi1,2，HUA Hong-xing1,2
1.Institute of Vibration ,Shock and Noise, Shanghai Jiao Tong University, Shanghai 200240；2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240
Abstract：The coupling between nonlinear friction and bending-torsion vibration can induce self-excited vibration in shaft system with water-lubricated rubber bearing, which can result in abnormal noise. The present researches are mainly based on single-point bearing to establish the dynamic model, which cannot analyze the influence of distributed bearing force and bearing inclination on the vibration characteristics of shaft system. In order to solve this problem, the dynamic model of a shaft system is developed, which is based on distributed bearing model and velocity dependent friction represented by Stribeck curve. The equation of motion is derived using Lagrangian approach and Modal Synthesis Method. Using numerical method, the paper analyzes the relationship between the nonlinear dynamic response and the system’s physical parameters. What’s more, the effects of contact force, rotational speed and the inclination of bearing are also discussed. According to the simulation results, the self-excited vibration in shaft system can be easily obtained for the inclined bearing if other conditions, like contact force, rotational speed and friction parameters, are the same.
2014, Vol. 33 
