Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.623925
Title: A study of dynamically loaded jounal bearings
Author: Shelly, Peter David
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1971
Availability of Full Text:
Access from EThOS:
Access from Institution:
Abstract:
A theoretical computer approach is developed that can be used for producing the shaft locus path of a dynamically loaded journal bearing. The approach employs a finite element technique to solve a one-dimensional form of Reynold's Equation so that results are achieved with the same speed of solution as current approximate methods. However, the method realises an accuracy of solution and generality of application that is normally only associated with more costly finite difference solutions. The finite difference programmes used to develop this technique are also described. A two-dimensional finite difference method is first produced to evaluate an axial pressure profile law that allows the problem to be reduced to a one-dimensional form. The one-dimensional equation is also solved by finite difference methods. Both finite difference programmes are used in case studies of the behaviour of steadily loaded bearings when allowance is made for certain geometric features of the bearing. The features considered are; the inclusion of oil feed holes, oil feed grooves, reliefs and chamfers in the pressurised region of the oil film, and the effect of surface roughness. Conclusions are made from the results with regard to including these features in the dynamic problem. The finite element approach is employed to produce the shaft centre loci of a range of externally loaded big-end bearings. Plots are also produced for a big-end bearing when allowance is made for the reduction in load capacity associated with an oil feed occurring in the pressurised region of the oil film. Case studies are shown for the whirl characteristics of heavy rotors when operating both with circular and non-circular, three lobed bearings.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.623925  DOI: Not available
Share: