This paper discusses the vibration of the latest vertical coolant pump with two disks and nonlinear bearing oil film force, namely rotor-bearing-disk system. To analyze the vibration of the rotor, the finite element method is adopted with the Timoshenko beam, and the dynamical equations are solved by using state-space Newmark method. Results of this study reveals the different mass eccentricity and phase angle of two disks are the important variables to the rotor with two disks under bearing nonlinear oil film force and periodic force, and affect the critical speed obviously.

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