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Author: Elsayed Morsi Aly Afify
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 152
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Book Description
Author: Elsayed Morsi Aly Afify
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 152
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Book Description
Author: Ming-Tang Ma
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 640
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Book Description
Author: A. Eshel
Publisher:
ISBN:
Category : High temperatures
Languages : en
Pages : 68
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Book Description
An analysis of foil journal bearings for a NASA Brayton Cycle Unit (BRU) is presented. The study represents an extension of previous work in that it includes the effects of thermal expansion of foil-bearing components, as well as an improved model of the influence of foil flexure. The results presented give the bearing film thickness, the bearing stiffness, and the foil tension as functions of the operating temperatures and the elasto-hydrodynamic and geometrical parameters pertinent to the design of BRU foil bearings. A computer program for the evaluation of design data and for parametric studies is included.
Author: Alex Florian Cristea
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The main objective of the thesis is to study the thermal effects in steadily loaded circumferential groove journal bearings (CGJBs), including cavitation phenomena occurring in the divergent zone of such bearings. Experimental research conducted at University of Poitiers - Institut Pprime - France enabled a thorough determination of film pressure and temperature fields for the front land of a CGJB plus its mid-groove section, and several performance parameters. Measurements of film pressure and temperature fields under steady-state regime surpassed existing works, regardless of journal bearing design, through: sheer number of land measurement locations, 180 for pressure and for 144 temperature; high precision state of art instrumentation; broad range of operating conditions, 0.125 ... 2 MPa specific bearing pressure and 5.25 ... 21 m/s shaft speeds. Transient start-up to steady-statestabilization regimes have been investigated at low loads. Experiments at University "Politehnica" of Bucharest - Romania showed a correlation between the downforce thrust and film rupture for a Rayleigh step pin (RSP), important in evaluating divergent zone cavitation phenomena. Theoretical research consisted in developing simple models for evaluating CGJBs performance in steady-state and transient start-up regimes. Several theoretical models were employed for assessing start-up seizure, catastrophic transient thermoelastic instability and damage risk. The major result is a reliable experimental data collection that: enables development of advanced theoretical models; disprove flat film pressure distributions in divergent zones, and constant pressure and temperature in the bearing supply groov.
Author: Henry McCallion
Publisher:
ISBN:
Category : Journal bearings
Languages : en
Pages : 10
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Book Description
Author: Josiah Doss Knight
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 310
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Book Description
Author: D. Dowson
Publisher: Professional Engineering Publishing
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 364
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Book Description
Author: John Austin Williams
Publisher: Cambridge University Press
ISBN: 9780521609883
Category : Technology & Engineering
Languages : en
Pages : 512
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Book Description
Engineering Tribology by John Williams of Cambridge University is an ideal textbook for a first tribology course and a reference for designers and researchers. Engineering Tribology gives the reader interdisciplinary understanding of tribology including materials constraints. Real design problems and solutions, such as those for journal and rolling element bearings, cams and followers, and heavily loaded gear teeth, elucidate concepts and motivate understanding. This work integrates qualitative and quantitative material from a wide variety of disciplines including physics, materials science, surface and lubricant chemistry, with traditional engineering approaches.
Author: J. Frene
Publisher: Elsevier
ISBN: 0080534317
Category : Technology & Engineering
Languages : en
Pages : 499
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Book Description
Hydrodynamic Lubrication is the culmination of over 20 years close, collaborative work by the five authors and discusses the practical use of the formalization of low pressure lubrication. The work concentrates on the developments to journal and thrust bearings and includes subjects such as: • the dynamic behaviour of plain and tilting-pads • the thermal aspects • the positive and negative effects of non-cyclindricity and shape defects resulting from manufacturing or operation • the effects of inertia • the appearance of Taylor's vortices and of turbulence and their repercussions. The book contains an abundance of test results objectively compared with theoretical conclusions and a chapter on "technical considerations" to ensure that draft mechanisms will work satisfactorily under the imposed conditions. Hydrodynamic Lubrication is an essential reference book for future and practising engineers who want to put hydrodynamic and hydrostatic journal bearings and thrust bearings into operation under conditions of total safety.
Author: ELSAYED MORSI ALY AFIFY
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
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Book Description
