Nonlinear Analysis and Characteristic Variation of Self-excited Vibration in the Vertical Rotor System due to the Flexible Support of the Journal Bearing

[+] Author and Article Information
Atsushi Nishimura

Nagoya Univ. Dept. of Mechanical Systems Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan, Nagoya, Aichi, Japan

Tsuyoshi Inoue

ASME Member, Nagoya Univ. Dept. of Mechanical Systems Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

Yusuke Watanabe

Ebara Corporation, 4-2-1 Honfujisawa, Fujisawa-shi, Kanagawa, 251-8502, Japan

1Corresponding author.

ASME doi:10.1115/1.4037520 History: Received January 30, 2017; Revised July 27, 2017


Various vibration problems occur in rotating machinery. Specifically, the large amplitude vibration can occur in the vertical pump using a journal bearing. Moreover, in an actual vertical pump, the stator's structure supporting the pump shaft may be relatively flexible. In such a case, rotor's motion such as self-excited vibration is not able to be predicted accurately without considering the fluid force reacting in the relative motion between the rotor and the stator. However, the vibration characteristics in such situations have not been explained theoretically so far. In this paper, the simple and quantitative method for evaluating vibration characteristics of a vertical rotating shaft with journal bearing is investigated. Eigenvalue analysis is demonstrated for the linearized system, and then, the nonlinear steady-state vibration analysis of the self-excited vibration is demonstrated. As a result, the influences of the parameters, such as fluid viscosity, radial clearance, and stiffness and damping of the flexible supporting part, on the vibration characteristics of the system are explained. Moreover, these theoretical results of the self-excited vibration in the vertical rotating shaft with journal bearing are verified experimentally.

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