A Study of the Influence of Bearing Clearance on Lateral Coupled Shaft/Disk Rotordynamics

This study examines the influence of bearing clearance on the dynamic behavior of a rotating, flexible disk/shaft system. Most previous work in nonlinear rotordynamics has tended to concentrate separately on shaft vibration or on bladed disk vibration, neglecting the coupling dynamics between them....

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Bibliographic Details
Published in:Journal of engineering for gas turbines and power 1993-04, Vol.115 (2), p.279-286
Main Authors: Flowers, G. T, Wu, Fang Sheng
Format: Article
Language:English
Subjects:
20 FOSSIL-FUELED POWER PLANTS
200104 - Fossil-Fueled Power Plants- Components
Applied sciences
AVAILABILITY
BEARINGS
CRITICAL VELOCITY
Energy
Energy. Thermal use of fuels
Engines and turbines
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
MACHINE PARTS
MACHINERY
MATHEMATICAL MODELS
MECHANICAL SHAFTS
MECHANICAL VIBRATIONS
PARAMETRIC ANALYSIS
ROTORS
SHAFTS
SYSTEMS ANALYSIS
TURBOMACHINERY
VELOCITY
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Summary:This study examines the influence of bearing clearance on the dynamic behavior of a rotating, flexible disk/shaft system. Most previous work in nonlinear rotordynamics has tended to concentrate separately on shaft vibration or on bladed disk vibration, neglecting the coupling dynamics between them. The current work examines the important rotordynamic behavior of coupled disk/shaft dynamics. A simplified nonlinear model is developed for lateral vibration of a rotor system with a bearing clearance nonlinearity. The steady-state dynamic behavior of this system is explored using numerical simulation and limit cycle analysis. It is demonstrated that bearing clearance effects can produce superharmonic vibration that may serve to excite high-amplitude disk vibration. Such vibration could lead to significantly increased bearing loads and catastrophic failure of blades and disks. In addition, multivalued responses and aperiodic behavior were observed.
ISSN:0742-4795
1528-8919
DOI:10.1115/1.2906706