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Fundamentals of the design of fluid film bearings
Fundamentals of the Design of Fluid Film Bearings Editors: S.M. Rhode, C.J. Maday and P.E. Allaire This volume is the second* in a series sponsored by the Fluid Film Bearing Committee of the ASME Lubrication Division. It contains six. papers presented at the Design Engineering Conference in Chicago, May 1979. The information is aimed at bearing designers to make them aware of recent advances and to enable them to make better judgements towards an improved design. The purpose of the volume is clearly stated by the editors as "to present an overview of current fluid film technology. After a review of the fundamentals of lubrication, treatments of high speed bearings, dynamically loaded bearings, lubricants and materials selection, computer aided design and hydrostatic bearings will be presented. The intent is to bring designers up to date on what is available and to show selected applications for purpose of illustration". These aims appear to be covered except for the section on lubricants and materials selection which is omitted. The title may lead one to assume that the whole work is a basic text book, rather than a selection of papers, some fairly advanced, intended for those already conversant with bearing design. The first paper, however, does provide an adequate introduction to the subject, explaining the fundamental behaviour of both hydrodynamic and hydrostatic bearings by discussing the balance of fluid flow. There appears to be a concentration of effort on hydrostatic bearings incorporated in three of the papers; one on fundamentals, another on design (with simple geometries considered to illustrate the procedure) and a third relating to computer aided design of hybrid conical bearings. This paper is unique in that it *Previous volunfe 'Fluid Film Bearings in Rotating Machinery and Bearing Design Optimisation ', May 19 78
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is supported by a program listing which is a welcome diversion.
dures and a preponderance o f experimental results are given.
Information on the design of dynamically loaded bearings, although presented very concisely as tutorial notes, helps in making the designer aware of the potential benefit of orbit analysis. Prediction procedures are cited and the mobility method discussed in some detail. As with most papers, the full story is only obtained by examining the appropriate references. Design criteria have been suggested and new information given for film thickness danger levels in connecting rod bearings. Another section deals with oil whirl resonance of a rotor bearing system. A simple theory is used first to create a partial mathematical model. The author then intends to set up a computer data base of experimental response data and work backwards to modify the hydrodynamic equations. This would appear a very ambitious line of attack and the results should prove interesting reading in the future. Information on the development of theory, experimental proce-
The section of the book dealing with the design of journal bearings for high speed rotating machinery surveys both theoretical and experimental stability results for various types of hydrodynamic bearings. The reviewer found this part of the book extremely interesting. It is well written, full of useful facts and gives a well balanced, overall view. A summary chart is presented indicating the advantages, disadvantages and other information for eight different types of journal bearing geometry (including cylindrical, multilobe, pressure dam, hydrostatic and tilting pad bearings). While the book appears to be a compendium of various works rather than a whole book, it nevertheless will serve as a useful aid and reference for designers of bearings.
F.A. Martin, Glacier Metal CompanyLtd, Alperton, Wembley,UK Available, price $24, from ASME, United Engineering Center, 345 East 47th Street, New York, N Y 10017, USA
Turbulent Boundary Layers: Forced Incompressible, Non-Reacting Edited by H.E. Weber Although the concept of the boundary layer and its sub-divisions has been available for many years there is still no unified approach to boundary layer flow calculations. Each class of problem still requires its specialised treatment. In June 1979 the American Society of Mechanical Engineers held a conference at Niagara Falls on one of the sub-divisions,
TRIBOLOGY international February 1980
namely turbulent boundary layers, with the declared aim of providing "a forum for the presentation and discussion of the current state of knowledge in prediction and analysis of turbulent boundary layer behaviour". The field is now so broad, however, that the conference was limited to contributions on forced, incompressible and nonreacting layers. This book is a compilation of the twenty-six papers pre-
32
is supported by a program listing which is a welcome diversion.
dures and a preponderance o f experimental results are given.
Information on the design of dynamically loaded bearings, although presented very concisely as tutorial notes, helps in making the designer aware of the potential benefit of orbit analysis. Prediction procedures are cited and the mobility method discussed in some detail. As with most papers, the full story is only obtained by examining the appropriate references. Design criteria have been suggested and new information given for film thickness danger levels in connecting rod bearings. Another section deals with oil whirl resonance of a rotor bearing system. A simple theory is used first to create a partial mathematical model. The author then intends to set up a computer data base of experimental response data and work backwards to modify the hydrodynamic equations. This would appear a very ambitious line of attack and the results should prove interesting reading in the future. Information on the development of theory, experimental proce-
The section of the book dealing with the design of journal bearings for high speed rotating machinery surveys both theoretical and experimental stability results for various types of hydrodynamic bearings. The reviewer found this part of the book extremely interesting. It is well written, full of useful facts and gives a well balanced, overall view. A summary chart is presented indicating the advantages, disadvantages and other information for eight different types of journal bearing geometry (including cylindrical, multilobe, pressure dam, hydrostatic and tilting pad bearings). While the book appears to be a compendium of various works rather than a whole book, it nevertheless will serve as a useful aid and reference for designers of bearings.
F.A. Martin, Glacier Metal CompanyLtd, Alperton, Wembley,UK Available, price $24, from ASME, United Engineering Center, 345 East 47th Street, New York, N Y 10017, USA
Turbulent Boundary Layers: Forced Incompressible, Non-Reacting Edited by H.E. Weber Although the concept of the boundary layer and its sub-divisions has been available for many years there is still no unified approach to boundary layer flow calculations. Each class of problem still requires its specialised treatment. In June 1979 the American Society of Mechanical Engineers held a conference at Niagara Falls on one of the sub-divisions,
TRIBOLOGY international February 1980
namely turbulent boundary layers, with the declared aim of providing "a forum for the presentation and discussion of the current state of knowledge in prediction and analysis of turbulent boundary layer behaviour". The field is now so broad, however, that the conference was limited to contributions on forced, incompressible and nonreacting layers. This book is a compilation of the twenty-six papers pre-