Caută
Afișează articolele 21-30 of 35
Vegetal Oils as Lubricating Materials
(Universitatea ”Dunărea de Jos” din Galați, 2008)
The success of vegetal oils is related to their biodegradability and reduced toxicity but a wide use is limited by their insufficient stability in time. Biodegradable oils have ecological advantages, being comparable or ...
Seizure of a High-Speed Three-Wave Journal Bearing
(Universitatea ”Dunărea de Jos” din Galați, 2008)
This paper is focused on the geometry and operating parameters of the bearing experimentally studied at NASA Glenn Research Center by F. Dimofte. It presents two simple thermoelastohydrodynamic (TEHD) models for two typical ...
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 ...
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 ...
Study of Wear Evolution for a Hydraulic Oil Using a Four Ball Tester
(Universitatea ”Dunărea de Jos” din Galați, 2008)
Time is crucial for the wear of materials. Time of an experiment must be long enough to obtain an observable wear but no so long to make the experiments expensive. For determining anti-wear properties of the hydraulic oils ...
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 ...
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 ...
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 ...
The Tool to Model through Micro Strain and Micro Cutting
(Universitatea ”Dunărea de Jos” din Galați, 2008)
The cutter wear is analised by a single hard fixed particle (inclusion) in brittle material. The shakedown pressure of the inclusion contact is directly proportional to shear field stress of the cutter surface and is ...