Research on mode and dynamic characteristics of the marine power generation steam turbine rotor

Based on the reasonable simplification of the actual structure,the finite element model of the marine power generation steam turbine rotor was built. The modal analysis of the rotor was done,the unbalance response of rotor model and the rotor model containing defects were calculated. The result shows that the modeling of the rotor is reasonable and the rotor structure is good in stiffness. And the vibration amplitude is not obvious at the first or second disk when the rotor model contains one or two blades missed. With the increase of the number of blades broke off,the vibration amplitude increases very quickly. The result can provide basic data for the fault diagnosis,and it is of great significance for prolonging the life of the rotor and ensuring its safe and reliable operation.