Study on Model of Continuous Rotor under Steam Seal Force

In order to study the impact of steam seal force,due to the steam turbine seals clearance,on the rotor vibration and stability,a complete structural model of single-disc and single-span continuous rotor system with double bearings and shaft seals is set up.Besides the nonlinear factors such as bending,shearing effect and shaft asymmetry,this paper takes the combined influence of both steam seal force,described by Musznyska model,and short bearing unsteady oil-film force into consideration.A nonlinear dynamic model of rotor system is built based on the Hamilton principle and is solved.