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Afișează articolele 76-95 of 160
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Neural Networks Based Study of Friction Coefficient Variation in Sliding Bearings
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The paper presents the possibility of using the neural networks approach for the analysis of friction coefficient evolution in case of sliding bearings. Several non-metallic bearing materials are investigated, both with ... -
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 ... -
A New Trend for Preparating Polymeric Calcium Sulfonates for Metal Working Fluids by Phase Transfer Catalysis. Part I.
(Universitatea ”Dunărea de Jos” din Galați, 2006)Calcium sulfonates derived from sulfonation of heavy alkylate and aromatic extract were synthesized and reacted with formalin to produce anionic polymer in the presence of phase transfer catalysts (PTC). These catalysis ... -
Nitrogen Influence on Indentation Fracture Toughness of Stainless Steel Coatings
(Universitatea ”Dunărea de Jos” din Galați, 2008)This paper studies some aspects of coatings fracture theory and the possibility of extending Lawn’s equation from Vickers indenter geometry to the Rockwell one. Indentation tests were performed on stainless steel coatings ... -
Numerical and Experimental Investigations Upon Articular Cartilage Mechanical Hysteresis
(UDJG, 2010)The paper presents biomechanical and tribological considerations upon articular cartilage. The experimental in vitro results from static and dynamic contact tests are presented together with numerical modelling of the ... -
Numerical Modelling of 3D Impact
(UDJG, 2010)The paper presents a virtual device designed for studying tri-dimensional impact. The main goal of the work is to present a solution for finding the coefficient of restitution for the tri-dimensional case of a sphere ... -
A Numerical Solver for the Wheel-Rail Contact Subjected to Combined Loads
(Universitatea ”Dunărea de Jos” din Galați, 2009)A working algorithm, able to be incorporated into a computer code, has been developed to solve the stress state in the general case of non-Hertzian contacts. Brent’s method has been involved to find the contact point for ... -
On Kerosene Lubrication of Hybrid Ball Bearings
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The hybrid ball bearings with silicon nitride balls are employed in special applications, e.g. high-speed machine tools and aeronautics. The kerosene can be used not only as a fuel for the jet engine, but also as lubricant ... -
On the Effect of Spectral Characteristics of Roughness on Contact Pressure Distribution
(Universitatea ”Dunărea de Jos” din Galați, 2009)In the first part of the paper, the matrix containing the roughness heights is obtained by a linear transformation of the Gaussian input matrix, the coefficients of the transformation matrix being found as solutions of a ... -
On Tribological Behaviour of Thermo-Chemical Treated Steels after Thermo-Magnetic Treatments
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents an analysis on two grades of steel, subjected to nitrocarburized or nitrided thermo-chemical treatment after different thermomagnetic treatments. Based on the concept of tribosystem, pairs of steel rollers ... -
On Viscosity Variation with Temperature of Rapeseed Oil After Different Processing Stages
(Universitatea ”Dunărea de Jos” din Galați, 2009)In recent years, vegetal oils are carefully studied as they may constitute a category of basic raw materials for obtaining organic biodegradable lubricants. Rapeseed oil is seen as an alternative of mineral and synthetic ... -
Optimisation of the Tooth Flank Geometry for Non-Standard Spur gear
(Universitatea "Dunărea de Jos" din Galaţi, 2006)In order to increase the transmissible power level of the plastic spur gears, a non-standard tooth is designed, with a variable geometry along the gear facewidth. The variation of the tooth flank geometry, generated by ... -
Overview on the Implementation of Tree Test Methods for Conformity Assessment of Fluids
(Universitatea ”Dunărea de Jos” din Galați, 2006)This paper presents three test methods for conformity assessment of technical fluids, all included in international, European and Romanian standards and their relevance for work security and health. -
Particularities of Rubber Lip Seals Used for Pneumatic Linear Drives
(Universitatea ”Dunărea de Jos” din Galați, 2009)The paper presents some particular aspects of reciprocating rubber lip seals for pneumatic linear drives. This study is focused on the following tribological aspects: friction variation under linear velocity, determination ... -
Postbuckling Behaviour of Composite Plates with Imperfections
(UDJG, 2010)The aim of the work presented in this paper is to analyze the influence of the imperfections on the changes in the buckling behaviour of ship deck plates made of composite materials. Thus, parametric analysis of the ... -
Power Losses Estimation in Precessional Gear
(UDJG, 2010)Having established the estimation relations of power losses in basic kinematical joints, it becomes relatively simple to establish the estimation relation of kinematical precessional transmission efficiency which, on the ... -
Prediction of Wear of Acetabulum Inserts Due to Multiple Human Routine Activities
(Universitatea ”Dunărea de Jos” din Galați, 2006)It is difficult to predict the quantitative and qualitative aspects of the wear of the components that allow relative motion due to several factors. First, the prosthetic parts in contact experience a wide spectrum of ... -
Preliminary Results on the use of Palm Oil and Shea Butter in Lubrication Process in Food Industry
(Universitatea ”Dunărea de Jos” din Galați, 2009)In this study, vegetal oils (palm oil and shea butter) are analyzed for their uses in lubrication of mechanical part of machines in food industry. These vegetal oils were analyzed by X-ray diffraction and transmission ... -
A Preliminary Study on the Dynamics of Triboemission, Work Function and Surface Charging of Ceramics
(Universitatea ”Dunărea de Jos” din Galați, 2006)This paper discusses the tribological dynamics of electron triboemission and after-contact emission during scratching of ceramics. The origin of such triboemission is still unclear, but the author and colleagues consistently ... -
Preparation of the Injection Moulded Polymeric Parts to Measure the Residual Stress
(Universitatea ”Dunărea de Jos” din Galați, 2009)Polymeric materials are nowadays widely employed as much for the manufacturing of a lot of daily objects as in the high-tech sector. These materials are well known for the extremely complex behavior strongly depending on ...
