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The rotor system is a nonlinear system and should be analyzed using a nonlinear method.The present study analyzes the dynamic behavior of a rotor/bearing/seal system with the coupled effect of the nonlinear oil-film force, nonlinear seal force and mass eccentricity of disk.The analysis focuses specifically on the effects of the rotational speed of the rotor, the pressure drop, the seal length and clearance, and the interior mass eccentricity of disk.