Căutare Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați după Data publicării
Afișează articolele 461-480 of 1845
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Mathematical Models for the Whole Traction Mechanical System of the Technological Self-Propelled Machines
(Universitatea "Dunărea de Jos" din Galați, 2007)The paper achieves mathematical models of the integral traction mechanical system, that is the system achieved only with gearings organized in the transmission components , gearboxes, card differentials transmissions, ... -
The Analysis of the Bending Sprigs' Weight Influence on the Resonance Characteristic of the Elastical Mechanical Systems
(Universitatea "Dunărea de Jos" din Galați, 2007)The Analysis of the Bending Springs' Weight Influence on the Resonance Characteristic of the Elastical Mechanical Systems -
Geometry Stage 3D Modeling of a Heat Station Pump
(Universitatea "Dunărea de Jos" din Galați, 2007)The paper presents the stages of the 3D modelling of a circulation pump in a domestic low-power heat station. The possibilities of modifying the geometry by changing the numerical size of the geometric parameters are ... -
Aspects Regarding the Vibrations of the Contacts of a compressed air Switch
(Universitatea "Dunărea de Jos" din Galați, 2007)The paper studies the vibrations of the contacts of a compressed air switch, by considering two models. Time variation of the elongation is presented, as well as spectral representations determined by means of Fourier ... -
Assisted Research of the Rigidity Amplitude of Worm-Gearing Tooth
(Universitatea "Dunărea de Jos" din Galați, 2007)By means of own software, which evaluates the rigidity of the worm-gear-tooth system, the paper presents some aspects regarding the amplitude of rigidity. The study was made on the elasticity characteristic of worm-gearing ... -
The Study of the Influence of Stability for Hydraulic Tracked Excavators Excavators with Bucket Using Assisted
(Universitatea "Dunărea de Jos" din Galați, 2007)The technological process of digging the natural earth using hydraulic excavators with bucket has the following steps: dislocation, transporting and depositing in means of transportation. During this process the excavator ... -
Diagnostic of Structural integrity Using the Non-Linear Vibration
(Universitatea "Dunărea de Jos" din Galați, 2007)The aim of the work presented here was to investigate the possibility of using hangs in the non-linear vibration characteristics to detect damage in mechanical structure. The nonlinearities were detected by examining the ... -
The Mechanical Low Frequency Signal Reconstruction by it's Spectral Components
(Universitatea "Dunărea de Jos" din Galați, 2007)This paper is a point of view of a new way of signal reconstruction through it’s spectral components. Sampling theory is analyzed from different perspectives, what means if for technical reasons the time can’t be sampled ... -
Flammability Tests on Hot Surfaces for Industrial Fluids
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Industrial fluids have to be evaluated not only for their performances as load capacity, durability, but also for their potential risk including ignition. Based on a solid documentation the authors point out the significance ... -
Structured Surfaces used for Improving Tribological Behaviour for the Piston – Ring Cylinder – Liner Friction Couples in Internal Combustion Engines
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Structured surfaces means the achievement of a rate, or controlled micro-geometry for one or both friction surfaces. These surface profiles are used to guarantee lubrication functions of transport, hoarding and spread of ... -
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 ... -
Research about Roughness resulted at Steel Turning and the Correlation with Piece Surability
(Universitatea "Dunărea de Jos" din Galaţi, 2007)For achieving this study the background of the research in correlation domain between roughness and piece durability are used. This paper performs a new research direction about the roughness, considered such volumetric ... -
The Resulted Roughness at Turning of some Non-Metallic Materials and Correlation with Durability of Machine Cut Surfaces
(Universitatea "Dunărea de Jos" din Galaţi, 2007)In this paper there are studied the results obtained at graphite and polyvinyl chloride turning. Such pieces are used like loose parts or in subassemblies. The final roughness of such pieces after processing and the influence ... -
Influence of Grease Grade and Working Regime on the Structural Modifications of the Superficial Layers on Roller-Roller Tribosystems
(Universitatea "Dunărea de Jos" din Galaţi, 2007)A X-ray diffractometric method is used for analysing the distributions of the 1-st and 2-nd tension state and dislocation density in the superficial layers, after tests in different working and lubricating conditions, the ... -
Diagniosis of the Technical State of Complex Mechanical Systems
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The paper presents a model for prediction and diagnosis of technical state of complex mechanical systems based on the systems theory. In diagnosis studies is used a model that has only input and output parameters as a ... -
A Study on the Prediction of Stability Behaviour for Flexible Rotor in Journal Bearings
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The influence of the labyrinth seals on the dynamic behaviour of a flexible rotor in journal bearings is investigated. In particular a code which makes possible the determination of the stiffness and damping coefficients ... -
The Level of Confidence for a Ship Hull Girder
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Structural estimation consists in a set of activities done to certificate security and reliability of an existing ship for its residual service life. Depending on ship’s type and damages, there are alternatively evaluation ... -
A Comparation of Standardized Methods for Lubrication Failure Determination
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Lubricants are used to prevent wear between moving parts and to resist to high pressure between them. There are standardized testing methods that determinate the wear of the contact pair pieces and the pressure that leads ... -
Durabilyty of Friction Pairs With Functionality in Abrasive Randomly Particles
(Universitatea "Dunărea de Jos" din Galaţi, 2007)It is shown that the abrasive particles, which penetrate in the convergent joint of friction pairs, can damage the superficial layer of surfaces. The wear caused by individual particle depends on having both a satisfactory ... -
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 ...
