NDLI: Whirl and whip: rotor/bearing stability problems

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Whirl and whip: rotor/bearing stability problems

Content Provider	NASA Technical Reports Server (NTRS)
Author	Muszynska, A.
Copyright Year	1985
Description	A mathematical model of a symmetric rotor supported by one rigid and one fluid lubricated bearing is proposed. The rotor model is represented by generalized (modal) parameters of its first bending mode. The rotational character of the bearing fluid force is taken into account. The model yields synchronous vibrations due to rotor unbalance as a particular solution of the equations of motion, rotor/bearing system natural frequencies and corresponding self-excited vibrations known as oil whirl and oil whip. The stability analysis yields rotative speed threshold of stability. The model also gives the evaluation of stability of the rotor synchronous vibrations. In the first balance resonance speed region two more thresholds of stability are yielded. The width of this stability region is directly related to the amount of rotor unbalance. The results of the analysis based on this model stand with very good agreement with field observations of rotor dynamic behavior and the experimental results.
File Size	1753017
Page Count	23
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19860020701
Archival Resource Key	ark:/13960/t5jb11s53
Language	English
Publisher Date	1985-12-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Self Induced Vibration Rotary Stability Oils Rotors Fluid Flow Equations of Motion Rotation Rotating Shafts Antifriction Bearings Bending Moments Resonant Frequencies Mathematical Models Lubrication Balance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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