Căutare Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați după Autor "f080ac95-524e-4ea9-bbae-9b601fb1f094"
Afișează articolele 1-20 of 22
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An Exact Method for Analysis of Kinematics for Mechanisms by Using Vectors Which Form Closed Polygons
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2013-05-01)Construction machinery equipments are complex, with a high degree of mobility. Their operation is done with groups of hydraulic cylinders equal in number with the mobility. This paper presents an exact calculation, which ... -
Autolisp & DCL Method for Automatic Technological Design
Goanță, Adrian Mihai; Rădulescu, Cătălin; Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2004)The work has as purpose to present the general principles of working with the technological processors in designing the casting technologies and to put into evidence the advantages of this designing method. As examples, the ... -
A Combined Method for Dimensioning Mechanisms Operated with Hydraulic Cylinders
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2011)This paper presents a method of synthesis of a mechanism used in ship steering systems. The case examines the use of force as elements of hydraulic differential cylinders articulated at both ends. Sizing the difficulty ... -
Controlled Parameter Modelling of Casting Pieces Bushing Type
Goanță, Adrian Mihai; Hauk, Niculai; Rădulescu, Cătălin (Universitatea "Dunărea de Jos" din Galați, 2002)The workpaper proposes a computer assisted modality of projection in order to obtain casting semiforms, starting from the 3D totally standardized model of the casting piece. The advantage of such a method is that the ... -
Influence of Geometrical Parameters on Rigidity of the Worm-Gearing Tooth
Ghelase, Daniela; Daschievici, Luiza; Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2002)By means of an original numerical method, the authors study the influence of the parameters of the worm-gearing tooth (diametral quotient, radius of profile curvature, profile angle of the worm, number of gear teeth) on ... -
Influence on Energy Efficiency Oof Mechanisms Operated With Hydraulic Cylinders
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2013-05-01)During the operation of mechanisms operated by hydraulic cylinders significant energy losses occur. They is due to the loss of flow, pressure and friction losses that occur in the system. This paper highlights the connection ... -
A Method for Determining the Pressure Loss Coefficients
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2012)For braking elements of mechanisms operated by hydraulic cylinders is used hydraulic resistance which controls the working fluid. Determination of these systems is difficult, especially in the design phase. This ... -
A Method for Establishing by Controlled Aproximation of the Limitted Forces Developed by Alignmed of the Hydraulic Cylinder
Hauk, Niculai; Goanță, Adrian Mihai; Ghelase, Daniela (Universitatea "Dunărea de Jos" din Galați, 2002)Determination of the limited forces – in case of the mechanisms actioned by the alignmed of the hydraulic cylinders is a very difficult problem to be realized very exactly. This paper presents a numerical method with a ... -
A Method of Assessing the Stress in some Components of Hydraulic Cylinders
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2008)This paper proposes a method for evaluating the stress of the unit body of the hydraulic cylinder and the rod which was at work and the Hydraulic Brake at the end of the race. The paper analyzes the situation in which ... -
A Method to Increase the Accuracy Of the Mathematical Model Used to Hydraulically Actuated Mechanical Systems
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2013-10-01)In order to achieve mathematical models describing hydraulically driven mechanical systems are taken into account both consumer behavior and characteristics of power sources and hydraulic circuits. The variable resistance ... -
A Method Used to Determin the Power Necessary for Hydraulic Excavators
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2010)This paper presents a method of verification in the design phase, the mechanical power necessary involvement hydraulic pumps for excavators with bucket reverse.Because, in the design phase the digging forces are not ... -
On the Influence of temperature the Cushioning Ability of the Hydraulic Cylinders
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2015)This paper presents some aspects related to the way the cushioning capacity of hydraulic cylinder is affected by the temperature variations of the hydraulic fluid. We have analysed the case of the hydraulic cylinders with ... -
Optimized Method for Synthesis of a Mechanism for Controlling a Hydraulic Operated Machine
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2011)This paper presents how can be design a mechanism capable of self command. It is intended as a high uniformity of the way of action, so that external control is as safe and simple. Are taken into account the concrete conditions ... -
Regarding the Efficiency of the Decelaration Through Impedance Coiling of the Hydraulic Cylinders
Hauk, Niculai; Dumitrache, Petru (Universitatea "Dunarea de Jos" din Galați, 2004)The paper present a point of view sustained by calculations about the efficiency of the deceleration system by impedance coiling of the hydraulic cylinders. It is shown that the simple presentation of the impedance ... -
Some Aspects Regarding the Working Periods of Mechanical Systems Driven with Hydraulic Feedback
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2014)The mechanisms of mechanical systems, driven by hydraulic feedback systems, have two degrees of mobility. Between the power system and the feedback system there is a hydraulic connection whose behavior is affected by a ... -
A Statistical Analysis of the Danube Flow Regimes in Brăila Harbour Area
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2015)It was in the frame of the „Restoration of the aquatic and terrestrial ecosystems complex, from Fundu Mare Island, part of the Small Wetland of Brăila - RAMSAR site 1074” project to look for solutions to improve the hydro ... -
Study on the Relationship Between Stability and Energy Efficiency of Hydraulic Excavators
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2014)The cycle of operation of hydraulic excavators has a series of steps in which large masses are accelerated and then braked. The presence of additional masses on the excavators improves stability but reduces energy efficiency. ... -
The Inclusion in the Calculation Schemws for Numerical Simulation of the Pressures Drop on Inlet and Outlet of Hydraulic circuits
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2014)Numerical simulation of the operation of hydraulic systems acting on hydraulic cylinderst is based on differential equations that describe the equilibrium of forces and the continuity of the flow rate. To simplify ... -
The Influence of the Hydraulic Fluid Compressibility on the Tematics of Mechanisms Actuated with Hydraulic Cylinders
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2015)the description of the kinematics of mechanisms driven by hydraulic cylinders, hydraulic agent is usually considered incompressible. This computing hypothesis introduces errors which, in certain situations, can not be ... -
The Possibilities of Increasing Efficiency and Confidence of the Calculations for Hydraulic Cylinders Provided with Cushioning System at System at end of Race
Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2012)Working with specialized software, fluid flow analysis has the disadvantage of being time-consuming. Also, modern computers are needed. This paper presents a way of combining simulation with specialized programs of ...