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 41-60 of 1845
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Considerations Upon Breaking Strength of Nodular Cast Iron Under Plastic Deformation
(Universitatea "Dunărea de Jos" din Galați, 2002)The work aims to demonstrate the existence of a mathematics connection between breaking strength and degree of plastic deformation in case of nodular cast iron. Research made along time starting 1932-1934 until now, ... -
The calculation of Pressure Forces Resultant About Rotor Bearings of Volumetrical Pumps and Motors with Radial Palettes
(Universitatea "Dunărea de Jos" din Galați, 2002)The objective of this paper refers to the presentation the calculation of pressure forces resultant about the palettes and the lateral rotor surface of volumic pumps and motors with radial palettes. This calculation is ... -
Response Behaves of Earthmoving Vehicle Where the Slip Ratio are Variation Linear
(Universitatea "Dunărea de Jos" din Galați, 2002)In this paper, the autor conceptualize the loader equations of motion for dynamic analysis of traction system where the slip ratio are variation linear. The wheel loader simulation model was formulated in terms of ... -
The Behavior of Mechanical Model Wheel' S Loader
(Universitatea "Dunărea de Jos" din Galați, 2002)In this work is described a dynamical model for the tire-suspension system of wheel loader. This model is based on the subdivision of the global dynamical system into its physical components: the tire, the wheel, ... -
Detecting the Liquid core in Continuous Casting Slabs by Load Torque Estimation in Unbending Zone
("Dunarea de Jos" University of Galati, 2002)The development in continuous casting process has been strongly dominated by the demands of quality improvement and reduced costs for steel products in recent years. To achieve these goals consideration has been given ... -
The Behavior Of Asymmetric Frontal Couplings With Permanent Magnets In Magnetic Powder And High Temperature Environments
("Dunarea de Jos" University of Galati, 2002)The main purpose of this paper is the comparative analysis of the behavior of frontal couplings with Nd-Fe-B permanent magnets in difficult environments, specific to metallurgy – such as environments with magnetic powders ... -
Real Time wind Turbine Simulator Based on Frequency Controlled Servomotor
("Dunarea de Jos" University of Galati, 2002)This paper is a contribution to the development of a real time wind turbine simulator. The simulator is designed to generate wind power on its shaft, and provide the static and dynamic characteristics of a given turbine. ... -
Numerical Treatment of some Complex Dynamic Processes of Saturated Induction Machine
("Dunarea de Jos" University of Galati, 2002)Three variants for the mathematical models of the saturated induction machine (the exact one, the classical one and the simplified one) are used for the analysis of the reversal process combined with one short mechanical ... -
Modeling, Identification and simulation of a Lighting Control System
("Dunarea de Jos" University of Galati, 2002)This paper presents the results of the first phase in the design of a control system for closed-loop regulation of the light amount in office-building rooms. This project is a joint development of Ghent University and ... -
Considerations on the Effect of Plastic Deformation Over the Magnetic Behavior of Soft Ferromagnetic alloy FE-3%SI NO
(2002)The paper synthetically presents the results obtained over the degradation of magnetic properties of soft ferromagnetic sheets Fe-3%Si NO required mechanically in plastic deformation area. Chronologically, the evolution ... -
Influence of High Performance Voltage Converters Supply Upon the Induction Motors Behaviour
("Dunarea de Jos" University of Galati, 2002)The induction motors supply by converters leads to a distorted regime accompanied by some parasite torques and some supplementary losses. These aspects are emphasized further on because their quantitative determinations ... -
Energetic Optimal Control of Adjustable Drive Systems
("Dunareade Jos" University of Galati, 2002)In the paper is developed a new control strategy for the adjustable speed drives. The strategy consists in the energetic optimal control of the dynamic regimes as starting, stopping and reversing. The main developed ... -
Simple Approach for Induction Motor Control Using Reconfigurable Hardware
("Dunarea de Jos" University of Galati, 2002)The paper deals with rotor-field-oriented vector control structures for the induction motor drives fed by the so-called tandem frequency converter. It is composed of two different types of DC-link converters connected ... -
On the Snubber Influence to the Switching and Conduction Losses in a Converter Using Switched Capacitor
("Dunarea de Jos" University of Galati, 2002)The paper deals to design and to compute the snubber parameters influence on the switching and conduction losses of the transistors (IGBT) used as bidirectional switches in a converter with switched capacitor. The converter ... -
Speed and Rotor Flux Estimation in Speed Sensorless Control of Induction Motor
("Dunarea de Jos" University of Galati, 2002)The paper compares the performances of several adaptive rotor flux and speed estimation methods used in speed sensorless vector control of induction motor. First, a short review of Luenberger, Gopinath, MRAS, Torque Error ... -
New Power Optimization Posssibilities
("Dunarea de Jos" University of Galati, 2002)In this paper there are given a few mathematical relations for the power analysis in un-sinusoidal regime. If the voltage is sinusoidal and the current is unsinusoidal, the apparent power will be ascertained by the active ... -
Energetic Macroscopic Representation Applied to an Electrical Urban Transport System
("Dunarea de Jos" University of Galati, 2002)An energetic description of the electric transport urban system ASTRAIK 415T is proposed according to a specific formalism. This is used to simulate the trolleybus system, equipped with a chopper and a direct current ... -
Some Considerations Regarding the Efficiency of the Electromechanical Motion
("Dunarea de Jos" University of Galati, 2002)Control techniques for servo drive which run at variable speed for prolonged time is developed on the base of minimum energy dissipation in a feed-forward structure. The optimal control laws are determinate using the ... -
Comparison on Sensorless Control of Synchronous Motors
(Dunareade Jos University of Galati, 2002)The paper compares two different methods for speed and position estimation in AC permanent magnet synchronous motors vector control applications. The first method implies two observer blocks — one for the speed, and the ... -
Optimal Control Structure for Variable Speed wind Power System
("Dunarea de Jos" University of Galati, 2002)This paper presents an optimal control structure for variable speed, fixed pitch wind turbine. The control objective results from the optimization criterion that includes two contradictory demands: maximization of the ...
