Study on vibration resistance of cylindrical rotor components in fluid

cylindrical;  rotor members;  vibration;  fluid resistance;  Vector analysis

According to the viscous resistance theory of fluid mechanics, the analytical expression of the fluid resistance of the cylinder when it vibrates laterally in the fluid is derived by vector analysis method, taking the moving rotor member - cylinder as the main body. The analysis results show that the resistance of the cylinder during the transverse vibration in the fluid includes two parts: inertia term and damping term, and its dynamic coefficient is not only related to the fluid properties and the structural size of the cylinder, but also related to the vibration angular velocity of the cylinder. At the same time, it is found that in addition to the inertial resistance of the cylinder when it vibrates laterally in an ideal fluid, the inertial term also adds a part related to viscosity; The damping term consists of two parts related to viscosity, one of which is related to fluid density and the other part is not related to fluid density. The derived formula can be used for fluid-structure interaction in rotor systems