Avoiding stick-slip chatter in low-speed bearings

Document Type

Article

Publication Date

4-10-2008

Abstract

The factors that need to addressed for avoiding stick-slip chatter for enhancing the efficiency of the low-speed bearings, are discussed. Many rotating machines, such as turbines, compressors, oil-well drill shafts, and water-lubricated ship stern-tube bearings can be managed by applying a flexible shaft. Journal surface speed drops below lift-off, leading the mating shaft and bearing surfaces to interlace, restrain shaft rotation with increased friction, and build up torsional elastic energy. The negative slope associated with the drop of the friction coefficient from boundary to mixed lubrication leads to rise in self-excited vibration. Feedback control loops needs to compensate for efficient management of friction. Ball bearings also need to use viscous grade of oil for lowering the oil-feed temperature and enhancing oil viscosity.

Publication Source (Journal or Book title)

Machine Design

First Page

80

Last Page

83

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