The role of the elasticity of the lubricant in rotor dynamics

Document Type

Article

Publication Date

1-1-1991

Abstract

An analysis is presented to find the effect of the elasticity of the lubricant in polymer containing multigrade oils on the performance of a dynamically loaded rotor, supported by short journal bearings. This paper solves for the loci of the center oj a journal, subjected to unsteady loading, using Newtonian and viscoelastic lubricants. The viscoelastic fluid is described by a relatively new rheological equation which has been shown to be sticcessful in predicting the experimental trends of various unsteady high shear rate flows. The analysis is a perturbation solution for low Deborah numbers where the stress relaxation process is a first-order effect. The results show an improvement in the performance of viscoelastic lubricants over Newtonian lubricants. Under an unsteady load, the journal center orbits show reduced eccentricity and travel of the journal due to the elasticity of the fluid. It implies that lubricants with a longer relaxation time can be developed where the viscosity and viscous losses can be reduced without adverse effect on the wear, resulting in a significant saving of energy. © 1991 Taylor & Francis Group, LLC.

Identifier

0026187781 (Scopus)

Publication Title

Tribology Transactions

External Full Text Location

https://doi.org/10.1080/10402009108982044

e-ISSN

1547397X

ISSN

10402004

First Page

353

Last Page

360

Issue

3

Volume

34

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