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ARTÍCULO
TITULO

Frequency Enhancement of Oil Whip and Oil Whirl in a Ferrofluid?Lubricated Hydrodynamic Bearing?Rotor System by Magnetic Field with Permanent Magnets

Liao-Yong Luo    
Yi-Hua Fan    
Jyh-Haw Tang    
Ting-Yu Chen    
Nai-Rong Zhong    
Pin-Chieh Feng and Yu-Chun Kao    

Resumen

The article describes the effect of a magnetic field applied to a ferrofluid–lubricated hydrodynamic journal bearing–rotor system. A rotor with a single journal bearing in one end was built to be the test rig. The experimental results showed that 3 to 8 permanent magnets, arranged by different methods, can all increase the instability threshold of the oil bearing. Especially, the magnetic field formed by eight magnets has the optimal effect. The whirl speed and the whip speed can be increased from 3024 rpm to 4480 rpm, and from 3184 rpm to 5268 rpm.

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