The vibration control of a flexible rotor by means of a squeeze film damper
The vibration control of a flexible rotor by means of a squeeze film damper
The squeeze-film damper (SFD) is a significant development benefitting rotor-bearing assemblies by providing multi-directional damping. There are two different configurations of the squeeze-film damper. One is with a squirrel cage retainer spring and another is not. No conclusive work has been carried out previously on a comparison of the relative merits of these two different configurations in a given situation. This research is concerned with such comparisons on the dynamic characteristics of the two configurations.
A theoretical analysis of the squeeze-film damper is made. Different forms of oil film forces for cavitated (π-film), uncavitated (2π-film) and more general models are obtained. Different numerical integration methods are used and compared. The traditional Runge-Kutta method is found to be inefficient in processing multi-degree of freedom systems. A fast numerical integration method is introduced and used to analyze the steady state and transient responses. This method takes one fifteenth to one quarter of the time used by the Runge-Kutta method to integrate to the same orbit of vibration. It is found that for some cases the iteration method and the harmonic balance method are more efficient.
A flexible shaft with an overhung disc and a middle disc is investigated theoretically for the two different configurations. The assembly is simplified as a three-mass system. Linear damper and nonlinear damper are analyzed by using the linear analysis and the iteration method respectively. Effects of the retainer spring stiffness, the supply pressure and imbalance are discussed.
Theoretical and experimental investigations are performed on a rotating shaft with an overhung disc. Different degrees of imbalance, the SFD static eccentricity and different suply pressures are applied. It is shown that when heavy damping is applied, the SFD is locked out, and consequently the two configurations have virtually the same dynamic performance.
University of Southampton
Chu, Fulei
b0cd11bc-cac2-4589-a75a-4a1a3f9d0fcd
1993
Chu, Fulei
b0cd11bc-cac2-4589-a75a-4a1a3f9d0fcd
Chu, Fulei
(1993)
The vibration control of a flexible rotor by means of a squeeze film damper.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The squeeze-film damper (SFD) is a significant development benefitting rotor-bearing assemblies by providing multi-directional damping. There are two different configurations of the squeeze-film damper. One is with a squirrel cage retainer spring and another is not. No conclusive work has been carried out previously on a comparison of the relative merits of these two different configurations in a given situation. This research is concerned with such comparisons on the dynamic characteristics of the two configurations.
A theoretical analysis of the squeeze-film damper is made. Different forms of oil film forces for cavitated (π-film), uncavitated (2π-film) and more general models are obtained. Different numerical integration methods are used and compared. The traditional Runge-Kutta method is found to be inefficient in processing multi-degree of freedom systems. A fast numerical integration method is introduced and used to analyze the steady state and transient responses. This method takes one fifteenth to one quarter of the time used by the Runge-Kutta method to integrate to the same orbit of vibration. It is found that for some cases the iteration method and the harmonic balance method are more efficient.
A flexible shaft with an overhung disc and a middle disc is investigated theoretically for the two different configurations. The assembly is simplified as a three-mass system. Linear damper and nonlinear damper are analyzed by using the linear analysis and the iteration method respectively. Effects of the retainer spring stiffness, the supply pressure and imbalance are discussed.
Theoretical and experimental investigations are performed on a rotating shaft with an overhung disc. Different degrees of imbalance, the SFD static eccentricity and different suply pressures are applied. It is shown that when heavy damping is applied, the SFD is locked out, and consequently the two configurations have virtually the same dynamic performance.
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Published date: 1993
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Local EPrints ID: 462502
URI: http://eprints.soton.ac.uk/id/eprint/462502
PURE UUID: 43247b44-14c9-48bc-b317-7accf037df70
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Date deposited: 04 Jul 2022 19:09
Last modified: 04 Jul 2022 19:09
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Author:
Fulei Chu
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