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Afișează articolele 891-900 of 1945
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 ...
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 ...
Wear Behaviour of the AL7175 Alloy under Different Bulk Stress States
(Universitatea ”Dunărea de Jos” din Galați, 2008)
In what concerns the stresses involved in the process, most wear tests (namely those in the pin on disc and the pin on plate configurations) are usually solely concerned with the stress state in the contact originated by ...
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 ...
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 ...
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 ...
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 ...
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 ...