Parametric Study of Thermal and Unsteady Effects in Hydrodynamic Lubrication of Journal Bearings PDF Download
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Author: Sang Chun (Myung)
Publisher:
ISBN:
Category :
Languages : en
Pages : 390
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Book Description
Author: Sang Chun (Myung)
Publisher:
ISBN:
Category :
Languages : en
Pages : 390
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Book Description
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:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 716
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Book Description
Author: Frederick T. Schuller
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 28
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Book Description
Author: Hany S. Abdo
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659529399
Category :
Languages : en
Pages : 132
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Book Description
This book is concerned with theoretical study for the thermal effects of the hydrodynamic journal bearings lubricated by ferrofluids with couple stresses. The study is generalize such that it covered both Newtonian and non-Newtonian behavior of the lubricant. Based on the momentum and continuity equations for ferrofluid under an applied magnetic field, a pressure differential equation (modified Reynolds equation) has been obtained. Assuming linear behavior for the magnetic material of the ferrofluid, and using carrying current concentric finite wire magnetic field model, the magnetic force was calculated. A modified Reynolds equation is obtained and it is simultaneously solved with the energy equation numerically by the finite difference technique. The pressure and temperature distributions have been obtained. The solution renders the bearing performance characteristics namely; load carrying capacity, attitude angle of the journal center, frictional force at the journal surface, friction coefficient and bearing side leakage.
Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 760
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Book Description
Author: Dominique Bonneau
Publisher: John Wiley & Sons
ISBN: 1119008034
Category : Mathematics
Languages : en
Pages : 176
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Book Description
This Series provides the necessary elements to the development and validation of numerical prediction models for hydrodynamic bearings. This book describes the thermo-hydrodynamic and the thermo-elasto-hydrodynamic lubrication. The algorithms are methodically detailed and each section is thoroughly illustrated.
Author: Thomas Wirsing
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 137
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Book Description
The hydrodynamic coefficients of a journal bearing set with the bearing subjected to axial oscillation are determined in this work. The Navier-Stokes equations were used to account for the axial component of the relative motion between the journal and the bearing. Numerical solution of the Navier-Stokes equations yielded the pressure distribution within the cavity of the bearing. This pressure distribution was then integrated over the surface of the bearing to obtain the two orthogonal force components. The derivatives of these force components were then taken with respect to the displacement and velocity of the journal that are co-linear with these forces. This yielded the hydrodynamic coefficients. To conduct a parametric study, the bearing design parameters were chosen such that the Sommerfeld number was equal to one. The axial oscillation of the bearing was modeled as a purely sinusoidal motion, with an amplitude of one millimeter and a frequency range of 0-304 rads/s. This study shows that for a bearing axial frequency up to 304 rads/s the bearing dynamic coefficients exhibit an increase in their deviation from the values of a stationary bearing. This study further shows that at the frequency of 300 rads/s the stiffness and damping coefficients vary dramatically over the course of cycle for the bearing set described in this work. This study shows Kxy changes from 1.711073 to 5.235242 back to 1.711073 again to 5.235242 and then back to 1.711073 as the bearing completes one-half cycle of travel.
Author: Fredrick T. Schuller
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 36
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Book Description
Author: Ralph A. Burton
Publisher: Springer Science & Business Media
ISBN: 1461212480
Category : Technology & Engineering
Languages : en
Pages : 226
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Book Description
A systematic treatment of the thermal and elastic deformation of bearings, seals, and other machine elements under a wide variety of conditions, with particular emphasis on failure mechanisms when high speeds or loads cause significant frictional heating and on methods for predicting and avoiding such failures. Intended for designers and mechanical engineers responsible for high-performance machinery, the book is unique in discussing instabilities driven by frictional heating and thermal expansion and in developing a theoretical approach to engineering design in those cases in which the thermal problems are pivotal. It thus provides a guide as to what is important in the development of high-performance engineering systems. References to recent publications, new material that fill gaps in the literature, a consistent nomenclature, and a large number of worked examples make this a useful text and reference for both researchers and practising engineers.
