Transient Vibration Prediction for Rotors on Ball Bearings Using Load-Dependent Nonlinear Bearing Stiffness
Rolling-element bearing forces vary nonlinearly with bearing deflection. Thus an accurate rotordynamic transient analysis requires bearing forces to be determined at each step of the transient solution. Analyses have been carried out to show the effect of accurate bearing transient forces (accountin...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2004-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/S1023621X0400048X |
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| Summary: | Rolling-element bearing forces vary nonlinearly with
bearing deflection. Thus an accurate rotordynamic transient
analysis requires bearing forces to be determined at each
step of the transient solution. Analyses have been carried
out to show the effect of accurate bearing transient forces
(accounting for nonlinear speed and load-dependent bearing
stiffness) as compared to conventional use of average rolling-element
bearing stiffness. Bearing forces were calculated by
COBRA-AHS (Computer Optimized Ball and Roller Bearing
Analysis—Advanced High Speed) and supplied to the
rotordynamics code ARDS (Analysis of Rotor Dynamic Systems)
for accurate simulation of rotor transient behavior.
COBRA-AHS is a fast-running five degree-of-freedom computer
code able to calculate high speed rolling-element bearing
load-displacement data for radial and angular contact
ball bearings and also for cylindrical and tapered roller bearings.
Results show that use of nonlinear bearing characteristics
is essential for accurate prediction of rotordynamic
behavior. |
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| ISSN: | 1023-621X |