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

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 metho...

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Veröffentlicht in:	Applied sciences 2018-09, Vol.8 (9), p.1687
Hauptverfasser:	Luo, Liao-Yong, Fan, Yi-Hua, Tang, Jyh-Haw, Chen, Ting-Yu, Zhong, Nai-Rong, Feng, Pin-Chieh, Kao, Yu-Chun
Format:	Artikel
Sprache:	eng
Schlagworte:	bearing lubricating fluid Computational fluid dynamics ferrofluid Ferrofluids Field strength Fluids hydrodynamic bearing Journal bearings Lubricants & lubrication Lubrication Magnetic fields Magnetic fluids Magnetic permeability oil whip Oil whirl Permanent magnets Permeability Permeability coefficient Pressure distribution Researchers Rheology Rotor-bearing systems Sensors Stiffness Temperature Vacuum Viscosity
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Beschreibung
Zusammenfassung:	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.
ISSN:	2076-3417 2076-3417
DOI:	10.3390/app8091687