Journal ArticleDOI
Interaction Dynamics Between a Flexible Rotor and an Auxiliary Clearance Bearing
James L. Lawen,George T. Flowers +1 more
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TLDR
In this paper, the synchronous interaction dynamics methodology is applied to a flexible rotor system and comparisons are made between the behavior predicted by this analysis method and the observed simulation response characteristics. And experimental studies are also performed to validate the simulation results and provide insight into the expected behavior of such a system.Abstract:
This study investigates the application of synchronous interaction dynamics methodology to the design of auxiliary bearing systems. The technique is applied to a flexible rotor system and comparisons are made between the behavior predicted by this analysis method and the observed simulation response characteristics. Of particular interest is the influence of coupled shaft/bearing vibration modes on rotordynamical behavior. Experimental studies are also perFormed to validate the simulation results and provide insight into the expected behavior of such a system.read more
Citations
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Journal ArticleDOI
Rotor/Seal Experimental and Analytical Study on Full Annular Rub
TL;DR: In this article, the authors investigated both synchronous (forward) and reverse (backward) precessions of full annular rub and found that the reverse precession occurs repeatedly in small clearance cases without any outside disturbance.
Journal ArticleDOI
Multiple Sliding and Rolling Contact Dynamics for a Flexible Rotor/Magnetic Bearing System
TL;DR: In this article, the authors used constrained Lagrangian equations of motion to develop a computationally efficient method to model contact dynamics, which does not require a direct physical modeling of contact forces, although the contact forces are automatically evaluated from the constraint conditions.
Journal ArticleDOI
Study of start-up vibration response for oil whirl, oil whip and dry whip
TL;DR: In this article, a Hilbert spectrum combining a full spectrum, which is named the full Hilbert spectrum, is developed to reveal the whole process of the transition from stability to instability and the behavior of fluid-induced instability and rub in rotor systems.
Journal ArticleDOI
Asynchronous periodic contact modes for rotor vibration within an annular clearance
Matthew O. T. Cole,Patrick Keogh +1 more
TL;DR: In this article, the dynamics of a multimode rotor-bearing system are analyzed when the rotor contacts with a stator having annular clearance, using a harmonic decomposition with generalized fundamental frequency, periodic solutions are obtained for rotor motions that involve asynchronous periodic contact.
Journal ArticleDOI
Full Annular Rub in Mechanical Seals, Part I: Experimental Results
TL;DR: In this paper, the results of recent experimental studies on rotor/seal full annular rub, including forward and reverse precession, were presented, with emphasis on the reverse and the transition from the forward to the reverse.
References
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Journal ArticleDOI
High Order Subharmonic Response of High Speed Rotors in Bearing Clearance
TL;DR: In this article, a simple but exact computer model of the subharmonic vibration was developed based on the numerical integration of a finite difference formulation. But the model is not suitable for systems with low damping and extreme nonlinearity.
Journal ArticleDOI
Interaction of a Whirling Rotor with a Vibrating Stator across a Clearance Annulus
TL;DR: In this article, the rotor and stator are regarded as linear multi-degree-of-freedom systems including damping, and dry friction at the clearance space is taken into account.
Journal ArticleDOI
Fractional-Frequency Rotor Motion Due to Nonsymmetric Clearance Effects
TL;DR: In this paper, an analysis based on the Jeffcott model is presented to explain 1/2 speed and 1/3 speed whirling motion occurring in rotors which are subject to periodic normal-loose or normal-tight radial stiffness variations.
Journal ArticleDOI
Transient Response Technique Applied to Active Magnetic Bearing Machinery During Rotor Drop
Toshiyasu Ishii,R. Gordon Kirk +1 more
TL;DR: In this paper, a theoretical formulation is proposed and solved numerically to examine the transient response of the flexible rotor, from the time just previous to when the AMB shuts down and including the rotor drop onto the back-up bearing.
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Rotor vibration with auxiliary bearing contact in magnetic bearing systems Part 1: Synchronous dynamics
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