Analysis of dynamically loaded hydrodynamic journal bearings with particular reference to the misaligned marine sterntube bearing

Jakeman, RW, 1988. Analysis of dynamically loaded hydrodynamic journal bearings with particular reference to the misaligned marine sterntube bearing. PhD, Nottingham Trent University.

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Abstract

The objectives were to develop methods for predicting the steady load performance and dynamic characteristics of hydrodynamic journal bearings. Consideration is given to bearing interaction with shafting load distribution and lateral vibration, since it is often unrealistic to analyse bearings in isolation. Comparisons of results with other published theoretical and experimental data are included.

An original numerical hydrodynamic analysis method is described. The main assumptions are an isoviscous film of incompressible Newtonian lubricant with laminar flow, and rigid circular journal and bearing surfaces. A novel procedure for satisfying flow continuity within the cavitation zone is featured.

Predicted steady load results and linearised dynamic coefficients are presented, with particular consideration of misalignment. The application of steady load results to a computer program developed for practical application is outlined, and example results are given.

The results of studies on the influence of cavitation on oil film non-linearity in aligned crankshaft bearings, and misaligned sterntube bearings, are presented. Nonlinear oil film response models based on the above results are described.

A new journal orbit analysis method has been developed for bearings with substantial dynamic loading. The associated results cover the influence of oil film history, journal mass and the interaction with lateral vibration of a marine propeller shafting system.

Contributions include the advancement of hydrodynamic bearing analysis methods. This includes the development of computer programs for practical application in the assessment of bearing operating conditions, and in modelling bearing support conditions for shaft alignment analysis. A further contribution is in the field of bearing influenced rotor dynamics with respect to marine propeller shafting. For the example shafting system considered, differences in lateral vibration amplitudes predicted with linear and non-linear bearing oil film models, were insignificant.

Item Type:	Thesis
Creators:	Jakeman, R.W.
Date:	1988
ISBN:	9781369323108
Identifiers:	Number Type PQ10290061 Other
Rights:	This copy of the thesis has been sent on condition that anyone who reads it is understood to recognise that its copyright rests with the author and that no quotation from it or information derived from it may be published without the author's prior written consent.
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	16 Jun 2021 11:17
Last Modified:	21 Sep 2023 10:46
URI:	https://irep.ntu.ac.uk/id/eprint/43083

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