Revista HIDRAULICA | HIDRAULICA Magazine

ISSN 2343–7707 ; ISSN-L 1453-7303

HIDRAULICA Magazine No. 2 / 2014

 


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EDITORIAL

ADMITTING NOT BEING ABLE TO MAKE A CHANGE
Gabriela MATACHE
Editor in Chief

The results we have been waiting for… or not. We are living for more than one year in a continuous waiting for the results in the competition of research projects. Here is the long awaited moment. Backstage games were finally completed. Projects which “had to” qualify were qualified. The missing points were awarded during assessment in panel. Projects which were scored too high in the first phase were downgraded to make room for the “favorite” projects. It makes me wonder….(read more)


THEORETICAL AND EXPERIMENTAL CHARACTERIZATION OF HANDLING OF LOADS AN AUTOMATED SYSTEM USING VACUUM TECHNOLOGY
Authors: Richard CASTRO, João NETO, Cleber IZIDORO, Anderson SPACEK, Osvaldo ANDO JUNIOR

The two most common techniques used for fixation and of parts and materials in the industry are mechanical clutches and pneumatic suction cups. These have different characteristics, but generally perform the same function with respect to the displacement of material. The suction cups are noted for being great elasticity, being the best choice when the goal is to arrest or transport brittle materials, for example glass. The purpose of this work is to carry out some tests for lifting ideal parameters for the selection of the handling system loads by using a vacuum suction technology, automotive intended for industrial processes…(read more)


ABC ANALYSIS, MODEL FOR CLASSIFYING INVENTORY
Authors: Marin RUSĂNESCU

Inventory classification using ABC analysis proved to be a highly successful method, it becoming popular due to the practical implications, helping managers to easily identify items on which they could turn their attention to creating a surplus value, I mean the articles of Class B and C or just those in the class that represented the bulk and stars stock..(read more)


EXPERIMENTAL DETERMINATION OF THE  ASPHALT ROAD PROFILE IRREGULARITIES Authors: David Alexandru-Dorin, Voicu Gheorghe, Dutu Mihaela Florentina, Cujbescu Dan

Determination of terrain profile is important when studying the model, the vibration on the mobil agricultural unit that occur in the vertical plane of symmetry due to vertical movement (bouncing or vertical oscillations) and rotations around the transverse axis passing through the center of gravity (pitching oscillations)…(read more)


DETERMINING THE STEP RESPONSE FOR A PNEUMATIC CYLINDER POSITIONING SYSTEM
Authors: Radu RADOI, Marian BLEJAN, Iulian DUTU, Gheorghe SOVAIALA, Ioan PAVEL

Linear pneumatic actuators are used to provide linear motion for medical, automotive, laboratory and robotics applications or in industrial aplications such as chemical and petrochemical industries, oil refineries, drilling industries, food industries for sorting and packaging lines, paper industries, etc. These actuators must be reliable and accurate to ensure proper and without disruption functioning of the installations they belong to. Applications they belong to sometimes require a high dynamics. In order to determine the performance of an actuator…(read more)


CONTRIBUTION TO HYDRAULIC TURBINES DRAFT TUBE DESIGN
Authors: Mircea BARGLAZAN, Ilare BORDEASU

The paper is devoted to parametric design of reaction hydraulic turbines draft tube. Knowing the hydraulic turbine runner data and location there are determined the draft tube length, cross sections geometry and shape. The efficiency ( recovery coefficient ) of this divergent special pipe in function of geometric and kinematic parameters is established. The analytical formulas obtained are useful for design and local hydrodynamic flow numerical analysis…(read more)


FORMING ECO-RESPONSIBLE BEHAVIOR OF FUTURE ENGINEERS BASED ON THE STUDY OF CARBON FOOTPRINT
Authors: Olimpia GHERMEC, Cristian GHERMEC

One of the major problems of humanity is represented by the climatic changes caused by the anthropogenic impact on the environment. Calculating carbon footprint for an activity or for a process is important in the conscious action of fighting global warming by reducing the emission of GHG. Studying carbon footprint (individual, for system or for activity) by the students from the technical education puts them in the situation to analyze the relationship…(read more)


THE IMPACT OF THE MINING ACTIVITY ON THE ECONOMIC SECTOR, HUMAN HEALTH AND ENVIRONMENT
Authors: Oana DAVID, Maria Valia MIHAI, Sanda MAIDUC (OSICEANU)

It is estimated that the EU’s energy mix will still rely heavily on fossil fuels, including coal, and the countries of Central and Eastern Europe, coal will be the main pillar of energy security, even to the year 2035. Therefore, this paper aims to capture the efforts made by the Romanian state in an attempt to streamline existing coal mines and close them those that were no longer profitable, showing the impact of the economic sectors in terms of the economic, social and…(read more)


SOME CONSIDERATIONS ABOUT THE STUDY OF PARTICLES MOTION ON THE CONICAL SIEVES
Author: Dorel STOICA

In this paper, the oscillation amplitude is determined by the influence of vibration of conical sieve with experimental measurements for both experimental stand. In order to determine the influence of vibration amplitude oscillations on the grid tapered experimental determinations were performed for both the experimental stand idle and when driving under load. The amplitude of oscillation was changed by changing the length of the arm fastened to the screen…(read more)


CAVITATION EROSION RESISTANCE OF AMPCO 45 BRONZE WITH HEAT TREATMENTS Authors: Ilare BORDEASU, Mircea Octavian POPOVICIU, Ion MITELEA, Lavinia Madalina MICU, Octavian Victor OANCA, C-tin BORDEASU, Laura Cornelia SALCIANU, Cristian GHERA

Cavitation erosion of ship propellers is a great inconvenient for maritime transportation. The use of proper alloys and heat treatments can increase the life of these pieces. In the paper is analyzed the effect of such a heat treatment upon the bronze AMPCO 45, used in the past especially for aircraft bearings, valve spindles and wear rings. Paper analyzes if it can be also applied for ship propellers, a field in which outside corrosion it appear also cavitation…(read more)


EXPERIMENTAL TESTING IN DYNAMIC REGIME OF HIGH PRESSURE PNEUMATIC ACTUATORS
Authors: Ionel NITA, Iulian–Cezar GIRLEANU, Sava ANGHEL, Alexandru MARINESCU

This article aims to present specific procedural issues related to testing in dynamic regime of pneumatic drive systems with high pressure (max. 40 bar) actuators, methodologies used in the testing activity conducted in the Laboratory of Pneumatics at INOE 2000-IHP Bucharest. Dynamic test procedures referred to in this article are: a)- testing the performance characteristics of the high-pressure actuator b)- testing the dynamic adjustability of high pressure actuators system c)- testing the dynamic stability of high pressure actuators system…(read more)

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