ISSN 2343–7707 ; ISSN-L 1453-7303


Hidraulica no 3/2022Simulation of the Working Cycle for a Hydraulic Press Equipped with a Flow Regulator Mounted in Graetz System
Author: Carmen DEBELEAC

The paper focuses on mathematic modelling of the working operation with the press unit, with hydraulic acting, where flow regulation in load is carried out with a flow regulator mounted in Graetz system. A non-linear simulation model was developed in Matlab/SimHydraulics environment for highlighting the dynamic behaviour of the main parameters of … (read more)

Algorithm in Python for Simulating Hydraulic Network for Educational Purposes 
Authors: Henrique PIZZO, Victor SANTOS, Marina EVANGELISTA

In order to make learning and fixing topics about water distribution networks simpler for students, by allowing quick tests, comparisons with results obtained by hand, and evaluation of the different head losses and nodal pressures generated by each specific situation of input values, an algorithm developed in Python language is presented. After a literature review on the subject of computational models in hydraulic systems and their application in the area of ​​water distribution networks, the steps for the execution of the model are discussed and presented, with some illustrative screens. Finally, a test is carried out to assess … (read more)

Determination of Energy Performance for a New Type of a Rotating Machine That Transports Fluids
Authors: Mariana Mirela STOICAN (PRISECARU), Nicolae BĂRAN, Gabriel FICHER-SZAVA

The paper presents a mathematical model of establishment for a constructive solution regarding:
– the maximum flow rate transported by the machine;
– the power required to drive this machine, which is a volumetric pump with two specially processed rotors.
The aspects regarding the transport of multiphase fluids and the advantages of … (read more) 

Constructive and Technological Considerations on the Realization of a Prototype of a Rotary Valve Made with 3D Printed Components with UV Resin
Author: Mircea Dorin VASILESCU 

This study is intended to be the first part of a series of technological studies to determine the possibility of realizing pneumatic and/or hydraulic components using 3D additive manufacturing processes with photopolymerizable resins. Since the problem of the environment protection is an important component, the author initiated a study on the structural and technical aspects of the efficient realization of a rotary valve prototype. Finally, considering the correlation and determination of dimensional repeatability of 3D printed parts using a polymerization process with a mask (MSLA) with light-emitting diodes, it is possible to transfer this study to … (read more)

A Volumetric Working Machine with Profiled Rotors for Fluids Circulation
Authors: Gabriel FISCHER-SZAVA
, Nicolae BĂRAN, Mihaela CONSTANTIN

The paper presents a constructive solution of a new type of volumetric rotating machine, with two profiled rotors, which can transport clean fluids or polyphasic fluids. The operation principle of the machine is set out and the computation relations are established for:
–  the rotating machine flow rate;
– the power required to drive the rotating machine.
At the end of the paper, the advantages of this machine are highlighted compared to … (read more)

Chassis with Installed Hydraulics for Multifunctional Vehicles Intended for Public Utility Works
Authors: Ștefan Mihai ȘEFU
, Radu Iulian RĂDOI, Liliana DUMITRESCU, Ioan BĂLAN,

The article presents a solution for the hydrofication of a small capacity truck chassis (total authorized mass of max 7.5 tonnes), i.e. equipping it with a hydraulic system (installation, aggregates, components, electrical control devices, etc.), to actuate various pieces of mechanical-hydraulic equipment (plow, snow cutter, salt spreader, sweeping brush, mower, etc.), intended for (read more)

Damping of the Rainwater Runoff by Small Underground Reservoirs in Subdivision Lots
Authors: Tayline BONANE, Henrique PIZZO, Marcela MEIRELES, Lucas ROCHA

The present work aims to evaluate the effect of small flow dampening reservoirs installed in the front of the lots in subdivision, regarding the reduction of the discharge peak and eventual decrease of the diameters of the drainage galleries, in relation to a conventional drainage system. After a review of the literature on the subject, the calculation of the drainage network of a certain street is carried out in the conventional way, with the presentation of the respective dimensioning worksheet. In sequence, the Routing Simulator Application is used in order to verify the reductions in the flows caused by … (read more)

Remote Control of an Automatic System for Handling Fragile Objects
Authors: Ionel Laurențiu ALBOTEANU, Ionel Bogdan ILIE

The paper presents a remote control solution based on wireless technology of a small-scale fragile object handling system. The description of the handling system and the local control solution by means of a PLC have been … (read more)

Thermal Rehabilitation of an Educational Building in the Context of the Adaptation of Buildings to the Effects of Climate Change. Case Study
Authors: Nicoleta-Elena KABA, Adrian RETEZAN, Adriana TOKAR

In view of the Directive 2006/32/EC of the European Parliament and of the Council of 5 April 2006 on energy end-use efficiency and energy services, it is requested, as a consequence, to ensure the Energy Audit of the building and propose energy improvement measures in order to access structural funds, inclusively for functional and structural rehabilitation. This article proposes to analyse the energy survey aimed at … (read more)

Modelling and Simulation of the Transient Performance of a Direct Operated Pressure Relief Valve
Authors: Sasko DIMITROV, Dejan KRSTEV

The dynamic characteristics determine variations of the inlet pressure in front of the valve in function of the flow through the valve in the time. In any hydraulic system, the valve is connected at least by a pipe at the outlet, and at its inlet there is some volume of compressible oil which influences the quality of the transient process. When switching the directional control valve in the hydraulic system with direct-operated pressure relief valves, a transient process occurs in which it is possible … (read more)

Main Constructive Solutions for Actual Wind Turbines Used for Green Power Generation
Author: Fănel Dorel ȘCHEAUA

It can be said that at the present time there is more than ever a need for energy at the global level to support the activities undertaken by the industrial branches as well as by the human communities. The possibilities of obtaining energy are limited and if we refer to the burning of fossil fuels, they have a direct effect on the environment, contributing decisively to the increase in global temperature values. Therefore, special attention must be paid to alternative methods that can be used to obtain energy; here we are talking about the action of the wind, the sun, or the force of sea waves. This paper presents the possibilities of obtaining energy from the wind action, on different models of wind turbines, with specific efficiency values ​​for … (read more)

Using Hydrological Concepts and an Artificial Neural Network to Model the Rate for COVID-19 Infections versus Deaths
Authors: Maritza Liliana ARGANIS JUÁREZ, Margarita PRECIADO JIMÉNEZ,

Models were run to reproduce COVID-19 infections versus deaths in Mexico City. The first model was made using rain runoff concept, emulating rain as number of infections reproducing runoff as number of deaths given as of March 2020. The second consisted of using an artificial neural network (ANN) proposed as an initial condition function to be implemented in the model with delay. These models were applied to … (read more)

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