Unbalance Response of a Jeffcott Rotor Incorporating Short Squeeze Film Dampers

[+] Author and Article Information
A. El-Shafei

Department of Mechanical Design and Production, Cairo University, Cairo, Egypt

J. Eng. Gas Turbines Power 112(4), 445-453 (Oct 01, 1990) (9 pages) doi:10.1115/1.2906188 History: Received January 13, 1989; Online April 24, 2008


The steady-state unbalance response of a Jeffcott rotor incorporating short squeeze film dampers executing circular centered whirl is obtained by a fast algorithm. Savings in execution time of the order of fifty times are gained over numerical integration. Fluid inertia forces are included in the model of the squeeze film dampers. The fast algorithm allows parametric studies to be performed. It is shown that fluid inertia results in the excitation of a second mode for the Jeffcott rotor, decreases the possibility of jump resonance, and decreases the useful range of vibration isolation of the dampers. It is also shown that a squeeze film damper with no centering spring (or a very soft spring) may be advantageous with regards to the unbalance response and the vibration isolation capability of the dampers.

Copyright © 1990 by The American Society of Mechanical Engineers
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