contributor author | J. Y. Zhao | |
contributor author | I. W. Linnett | |
contributor author | L. J. McLean | |
date accessioned | 2017-05-08T23:46:02Z | |
date available | 2017-05-08T23:46:02Z | |
date copyright | July, 1994 | |
date issued | 1994 | |
identifier issn | 1048-9002 | |
identifier other | JVACEK-28815#357_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/114647 | |
description abstract | When a squeeze-film damper is operated eccentrically, the nonlinear damper forces are no longer radially symmetric and subharmonic and quasi-periodic vibrations may be excited by the rotor unbalance. In this study, the unbalance response of a rigid rotor, supported on an eccentric squeeze film damper, is first approximated by a harmonic series whose coefficients are determined by the collocation method, together with a nonlinear least-square regression. The stability of the resulting periodic solution is then examined using the Floquet transition matrix method. For sufficiently large values of the unbalance and the damper static radial misalignment, it is shown that the approximate harmonic motion loses its stability and bifurcates into a stable subharmonic motion and a quasi-periodic motion at speeds above twice the system critical speed. This analytical finding is verified by a numerical integration in forms of the Poincaré map, the rotor trajectory, the bifurcation diagram, and the power spectrum. It is suggested that stability analysis and numerical integration should always be incorporated into an approximate analytical method to achieve an adequate approximation. The results of this study show that the introduction of squeeze-film dampers may give rise to the undesirable nonsynchronous vibrations, which limits the maximum speed at which dampers should be used. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Subharmonic and Quasi-Periodic Motions of an Eccentric Squeeze Film Damper-Mounted Rigid Rotor | |
type | Journal Paper | |
journal volume | 116 | |
journal issue | 3 | |
journal title | Journal of Vibration and Acoustics | |
identifier doi | 10.1115/1.2930436 | |
journal fristpage | 357 | |
journal lastpage | 363 | |
identifier eissn | 1528-8927 | |
keywords | Motion | |
keywords | Dampers | |
keywords | Rotors | |
keywords | Stability | |
keywords | Vibration | |
keywords | Approximation | |
keywords | Bifurcation | |
keywords | Poincare mapping | |
keywords | Spectra (Spectroscopy) | |
keywords | Harmonic motion | |
keywords | Trajectories (Physics) AND Force | |
tree | Journal of Vibration and Acoustics:;1994:;volume( 116 ):;issue: 003 | |
contenttype | Fulltext | |