The dynamic nature of rotor thermal bending due to unsteady lubricant shearing within a bearing
- 9 May 1994
- journal article
- Published by The Royal Society in Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences
- Vol. 445 (1924), 273-290
- https://doi.org/10.1098/rspa.1994.0061
Abstract
The influence upon the temperature distribution within a hydrodynamically lubricated journal bearing of a time varying journal orbit is considered and the oscillatory source distribution arising as a result of unsteady shearing of the lubricant is examined with respect to axes which rotate with the journal. The time dependent thermal bend induced in a rotor by such a process has been evaluated and incorporated into a rotor dynamic model for the assessment of system stability. Techniques have been developed enabling calculations to be carried out on an idealized rotor-bearing configuration and the speed range over which instability occurred was established. The rate of growth of the unstable vibrations together with the rate and direction of `spiralling' of the thermal bend vector were also determined. Features of rotor and bearing design having an influence on such thermally induced instability are assessed.Keywords
This publication has 5 references indexed in Scilit:
- Journal bearing differential heating evaluation with influence on rotor dynamic behaviourProceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences, 1993
- Thermoelastic influences in journal bearing lubricationProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1986
- An Approximate Analysis of the Temperature Conditions in a Journal Bearing. Part I: TheoryJournal of Tribology, 1984
- The Dynamics of Rotor-Bearing Systems Using Finite ElementsJournal of Engineering for Industry, 1976
- Contributions to the Determination of the Real Clearance in Sliding BearingsJournal of Basic Engineering, 1965