Căutare 2008 fascicula8 după Titlu
Afișează articolele 1-20 of 35
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Analysis of Gear Quality Criteria and Performance of Curved Face width Spur Gears
(Universitatea ”Dunărea de Jos” din Galați, 2008)For plastic gears, developments in composites and tooth geometry are essential for their selection in power transmissions. In order to enhance the transmissible power level of the plastic spur gears, an arc-shaped tooth ... -
Behaviour of a Hydrodynamic Journal Bearing: Torque Measurement During Start-Up
(Universitatea ”Dunărea de Jos” din Galați, 2008)The start-up friction coefficient in hydrodynamic bearings, used by engineers in the design of bearings, is most often issued from an approximation. Several studies can be found in the literature on this topic but most of ... -
Characterizing the Wear Particles of Intervertebral Disc Prosthesis and their Biological Response
(Universitatea ”Dunărea de Jos” din Galați, 2008)Prosthetic debris is the leading factor causing prosthetic loosening and requiring revision surgery. Wear debris is formed over time with any prosthesis. Factors determining disc arthroplasty survivability are similar to ... -
Contact Model for a Rough Surface
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents a model for the determination of the contact characteristics, pressure distribution and subsurface stress field at the contact cylinder- plane. The first part of the paper presents the geometrical models ... -
Dynamics of Hip Artificial Joints Wear
(Universitatea ”Dunărea de Jos” din Galați, 2008)In the present paper the authors try to evaluate, based on the results obtained from experimental and numerical previous studies, the wear evolution in the components of a Total Hip Prosthesis (THP), during the service ... -
Electrochemical and Mechanical Changes on Fatigue Corrosion Damaged Surfaces
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents some surfaces changes aspects in fatigue corrosion damage based on electrochemical, mechanical profilometry and microscopically analyze of cylindrical and plate steel specimens. The researches have ... -
Experiences in Lubrication of non-Natural Gas Fuelled Stationary Engines
(Universitatea ”Dunărea de Jos” din Galați, 2008)In Europe, a huge number of generators for electric power, powered by those stationary engines are becoming increasingly popular in regions where these renewable fuel sources are available. Nevertheless, the continuously ... -
Experimental Investigations Concerning the Mathematical Model of Hard Deposits by High-Speed Flame Spraying
(Universitatea ”Dunărea de Jos” din Galați, 2008)A complex study was done by the paper’s authors using some independent models that take into account the combustion process, the particles’ dynamics, the fluid dynamics and also the particle fluid transfer processes when ... -
Experimental Study on Roughness Parameters Variation, During Running – in Period, for a Cylinder-Plane Friction Couple
(Universitatea ”Dunărea de Jos” din Galați, 2008)The studies of various lubrication problems have been recently focused on atypical geometrical and operating conditions (extreme conditions). Among these cases, one can find analyses of HD bearings having surface macroscopic ... -
Experimental Study on Roughness Parameters Variation, During Running – in Period, for a Cylinder-Plane Friction Couple
(2008)The studies of various lubrication problems have been recently focused on atypical geometrical and operating conditions (extreme conditions). Among these cases, one can find analyses of HD bearings having surface macroscopic ... -
Flammability Test Data in Risk Assessment
(Universitatea ”Dunărea de Jos” din Galați, 2008)This paper reviews the most recent information on standards dealing with testing fire-resistance of hydraulic fluids in order to emphasis the importance of selecting hydraulic fluids including as basic criteria of reducing ... -
Global Method Using Experimental Data for Characterizing the Lubricants Durability
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents a global method for characterizing the durability of lubricants, in order to establish the moment of changing, using objectives criteria. Three types of lubricants, for essence and Diesel engine, have ... -
High-Speed Hybrid Angular Contact Ball Bearings Lubricated by Kerosene Mist
(Universitatea ”Dunărea de Jos” din Galați, 2008)This paper presents some experimental research, carried-out on 7206C hybrid angular contact ball bearings lubricated by oil and kerosene mist. The monitored parameters are the friction moment of the testing bearing, and ... -
Hip Joint Contact Pressure Distribution Pand After Triple Osteotomy
(Universitatea ”Dunărea de Jos” din Galați, 2008)A 3−D reconstruction method based on CT scans was used to compute the femoral head coverage for dysplasic hips prior and after reconstruction surgery. The triple osteotomy technique was used to “reorient” the acetabulum ... -
Hydrodynamic Effects of Texture Geometries on Journal Bearing Surfaces
(Universitatea ”Dunărea de Jos” din Galați, 2008)Lately, the expanding range of tribological applications to the microscopic levels has revived interest in this field. Actually, little is understood about the subtle effects of variations of a journal bearing’s profile ... -
Industrial Gear Oils from Renegerable Feed Stocks
(Universitatea ”Dunărea de Jos” din Galați, 2008)The aim of this research study is to obtain industrial gear oils. The formulation of this type of lubricant is based on vegetable oils or mixtures of vegetable oils with more stable base oils and appropriate additives. The ... -
Influence of Shear Stability on Oils Behaviour
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents a method to establish a link between the shear stability index and service behaviour of motor oils. A standardized method for shearing stability establishing is combined with appropriated curve fitting ... -
Influence of the Sliding Speed on the Elastohydrodynamic Regime
(Universitatea ”Dunărea de Jos” din Galați, 2008)The study of the elastohydrodynamic (EHD) lubrication regime is characterristic for the heavily loaded gears and can be modeled on a two disk (SAE) rig. It is very important to observe and determine the lubrication regime ... -
Investigation of Layers Formed Through Selective Transfer with Atomic Force Microscopy
(Universitatea ”Dunărea de Jos” din Galați, 2008)Atomic force microscopy (AFM) has become a versatile tool for investigating local mechanical properties. In addition, through the AFM tip-couple interaction, it is possible to study the effects of perturbations and ... -
New Test Facility for Fluid Film Journal Bearings
(Universitatea ”Dunărea de Jos” din Galați, 2008)This paper describes a new experimental rig to test journal fluid film bearings. It has been operating at the NASA Glenn Research Center (GRC) in Cleveland, Ohio since August 2006. The rig can apply total radial loads of ...
