Characteristics of the self-excited vibration of the vertical rotor system with the journal bearing

Abstract

In this paper, vibration characteristics of a vertical rotor system were investigated. Both the additional degree of freedom of the journal bearing support portion and rotor dynamic(RD) nonlinear fluid force by the journal bearing were considered, and their effects on the vibration characteristics were investigated, numerically. As a result, it was observed that an existence region of self-excited vibration was reduced by supporting the journal bearing flexibly. Moreover, influence of parameters; stiffness for the support part, a damping for the support part, and radial clearance, on the vibration phenomenon was clarified.