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32-87 STUDIUL ABSORBŢIEI SONORE DE CĂTRE PLANTELE DE INTERIOR

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Arabela LUNGU Mariana ARGHIR la de

STUDY OF SOUND ABSORPTION BY INTERIOR PLANTS
The paper contains a proof study on the sound absorbtion by ornamental plants (indoor). They have considered a lot of plants: Buxus Sempervirens, Thuja Occidentalis, Ficus Benjamina, Spathiphyllum and Philodendron Scadens Spatiphyllum, for which we have been made on the sound absorption measurement and came to some remarkable conclusions concerning absorbed soundtrack by these plants. In this paper it proves why some plants have more pronounced sound absorption than other plants. Demonstration is made by microscopic study of the leaf planting.
Keywords: pollution sound, absorption, houseplants
Cuvinte cheie: poluare sonorǎ, absorbție, plante de interior

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32-86 CONSIDERAȚII ASUPRA MODALITĂȚILOR DE VALORIFICARE ENERGETICĂ A DEȘEURILOR MUNICIPALE ÎN JUDEȚUL SATU MARE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Marius Dan CRIȘAN Sandor MANESES Tiberiu LEHENE Vasile Filip SOPORAN la de

CONSIDERATIONS ON MODALITIES HOW MUNICIPAL WASTE ENERGY CAPITALIZING IN COUNTY SATU MARE
This paper proposes a method of critical analysis of methods of municipal waste energy recovery, with emphasis on the fraction that can not be integrated into traditional recycling streams. We refer to this category of waste, which includes a degraded state, plastic, paper, wood and textiles that can not be recycled, recovered through existing pathways. Among the main objectives of this work are: waste structure analysis at regional warehouse Doba and their potential exploited; Determination of the energy potential of partially dried; Analysis on the processes of energy capitalizing from municipal waste
Keywords: Municipal waste, energy potential, energy capitalizing, fuel economy
Cuvinte cheie: deșeuri municipale, energie potențială, valorificare energetică, economia de combustibil

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32-85 CONTRIBUȚII LA CERCETAREA APLICATIVĂ A EFECTELOR POLUĂRII MEDIULUI ÎNCONJURĂTOR DE CĂTRE TRAFICUL RUTIER ASUPRA ANATOMIEI OCHILOR ȘI A DEZVOLTĂRII PATOLOGICE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Doru Laurean BĂLDEAN Ioan Aurel CHERECHEŞ Lavinia ANDREI la de

CONTRIBUTIONS TO THE APPLIED RESEARCH OF EFFECTS FROM SURROUNDING ENVIRONMENT POLLUTION DUE TO ROAD TRAFFIC UPON EYES’ ANATOMY AND PATHOLOGY DEVELOPMENT
Air pollution due to road traffic and all automotive related industries influence the natural characteristics and composition of the earth’s atmosphere. Surrounding environmental pollution due to excessive road traffic is nowadays an important determining factor in health development and stability. Pollutants of major public health concern include particulate matter (PM), carbon monoxide (CO), ozone (O3), nitrogen dioxide (NO2), and sulphur dioxide (SO2) according to the World Health Organization (WHO). The present scientific article reviews some applied studies that investigated the adverse effects of air pollution on the ocular surface and also presents some SO2 experimental data recorded in Cluj-Napoca city in recent years. The paper summarizes an experimental work on the problem of pollution impact upon human health.
Keywords: air, environment, eye, pollution, ocular surface
Cuvinte cheie: aer, mediu, ochi, poluare, suprafaţa oculară

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32-84 RECICLAREA MATERIALELOR TEXTILE PENTRU DURABILITATEA MEDIULUI ÎNCONJURĂTOR

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Adelina-Paula COBUZ Elena-Simina LAKATOS Matthew GREENLEY Mihaela ORBAN la de

RECYCLING TEXTILE MATERIALS FOR
ENVIRONMENTAL SUSTAINABILITY
The article presents the main problems related to over-consumption of clothes and textiles in general, due to the demand of new fashion and fast production. Therefore, it will present information about the businesses that are utilizing recycled clothing in a variety of services in order to prevent waste and maintain environmental sustainability. Also, the article will have a focus on the main fashion chains, ZARA and H&M and the Circular Economy that they present as a business method. We will see the importance of protecting the resources and our environment through ways and methods which also help the global economy.
Keywords: recycling, sustainability, textile industry, environment, circular economy

Cuvinte cheie: reciclare, sustenabilitate, industria textilă, mediu, economie circulară

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32-83 ESTIMAREA CONCENTRAȚIEI DE POLUANȚI CU SCREEN VIEW

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Lucia VÎLCEANU Mihaela FLORI la de

ESTIMATING POLLUTANT CONCENTRATION USING SCREEN VIEW
Screen View is a program that uses Gaussian air dispersion model to estimate pollutants concentration at ground level. In function of pollutant source type, weather conditions and pollutant characteristics, is calculated the concentration (in μg/m3) vs. distance from source (in m).
Keywords: air pollution, Gaussian model for pollutant dispersion in air
Cuvinte cheie: poluarea aerului, model Gaussian al dispersiei poluanților în atmosferă

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32-82 VALORIFICAREA NĂMOLURILOR PROVENITE DE LA STAŢIILE DE TRATARE A APELOR UZATE DIN PERSPECTIVA ECONOMIEI CIRCULARE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Alina-Monica NEȘ Elena-Simina LAKATOS Mihaela ORBAN Oana-Adriana CRIȘAN la de

SLUDGE VALORIZATION FROM WASTEWATER
TREATMENT PLANT TOWARDS A CIRCULAR ECONOMY
This study aimed to investigate the sludge removed from wastewater treatment plants and various modes of disposal as waste. One way of treating it as fertilizer on agricultural land use, its rich content in nutrients. So then it is necessary analysis and testing before use sludge future presentation. However, this method may be limited by the presence of heavy metals, pollutants microbiological agents, organic and inorganic contaminants. In this article, a variety of sampling analysis, pre-treatment, extraction and methods have been reviewed. Therefore, we consider that an important part of treatment of sludge prior to disposal is the separation of water and sludge volume reduction.
Keywords: sludge, capitalization, circular economy, wastewater treatment

Cuvinte cheie: nămol, valorificare, economie circulară, epurare ape uzate

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32-81 METODA DE ANALIZĂ A MESAJELOR PLATFORMELOR ON-LINE DIN PERSPECTIVA ECONOMIEI CIRCULARE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Mihail Marius VESCAN Tiberiu LEHENE Vasile Filip SOPORAN Viorica SAMUILĂ la de

METHOD OF ANALYSIS ONLINE MESSAGING PLATFORMS FROM THE PERSPECTIVE OF CIRCULAR ECONOMY
This paper is based on the fact that online messages are a reality that must be taken into consideration in the traditional manufacturing process, including castings. Since circular economy principles are known for a long time in the mentioned area, this paper intends to analyse the entrepreneurial platforms in terms of sustainable development among the actors of these specific activities. The rationale of this scientific approach is given by the possibility of building a working instrument used in setting entrepreneurial platforms from the point of view of validating actions of eco-responsibilities in the field of castings from the perspective of circular economy.
Keywords: circular economy, online entrepreneurial platform, castings, online environment, online image, image analysis, image profiles
Cuvinte cheie: economie de circulară, platforma antreprenorială on-line, piese turnate, mediul on-line, imagine online, analiza imaginii, profile de imagine

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32-80 METODE ȘI TEHNOLOGII ECO-INOVATIVE PENTRU REDUCEREA ȘI RECICLAREA POLUANȚILOR ORGANICI PERSISTENȚI DIN MEDIUL ÎNCONJURĂTOR – Prezentare Generală

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Carmen CRISTOREAN Elena-Simina LAKATOS Mihaela ORBAN Oana-Adriana CRIȘAN la de

ECO-INNOVATIVE METHODS AND TECHNOLOGIES FOR REDUCING AND RECYCLING OF PERSISTENT ORGANIC POLLUTANTS FROM ENVIRONMENT-AN OVERVIEW
The most toxic pollutants in the environment that originated from human activities are the Persistent Organic Pollutants (POPs) which are chemicals that accumulate and persist in the environment through the trophic web causing negative effects to human and environment health. POPs present a high risk because of their capacity to be transported across the borders affecting even regions where they have never been used or produced. This article presents a general description of the persistent organic pollutants and their level at the UE level and aim to revise the best available methods and technologies utilized in reducing POPs, along with their advantages and disadvantages. The flux of the persistent organic pollutants in the environment is also outlined with the purpose to identify the low spots that need to be addressed.
Keywords: POP, bioremediation, sustainability, hazardous substances

Cuvinte cheie: POP, bioremediere, sustenabilitate, substanțe periculoase

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32-79 STUDII PRIVIND EVOLUȚIA UNOR INDICATORI AI CALITĂȚII AERULUI, AFECTAȚI DE TRAFICUL AUTO ÎN MUNICIPIUL CLUJ NAPOCA

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Dan MOLDOVANU Ferenc GÁSPÁR Ioan Aurel CHERECHEŞ la de

STUDIES ON SOME AIR QUALITY INDICATORS
AFFECTED BY ROAD TRAFFIC IN CLUJ-NAPOCA CITY
The paper aims to present the current level of air pollution produced by road traffic in Cluj-Napoca city, and finally, provides possible solutions so that the pollution levels will be reduced and air quality will improve. Environmental Protection Agency in Cluj County has installed a number of 4 automatic stations for air quality measuring, in Cluj-Napoca. Measurement of PM10 pollutants is achieved by using LSPM10 method. All the recommendations were adapted to the specificity of Cluj-Napoca City, the second largest city in the country.
Keywords: air pollution, PM10, traffic, Cluj-Napoca City
Cuvinte cheie: poluarea aerului, PM10, trafic, municipiul Cluj-Napoca

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32-78 EFECTUL DEZVOLTĂRII COMPACTE ȘI PE VERICALĂ A MUNICIPIULUI CLUJ-NAPOCA ASUPRA MEDIULUI AMBIANT

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Simona-Elena AVRAM Viorel DAN la de

THE EFFECT OF DEVELOPMENT COMPACT AND
VERTICAL CITY CLUJ-NAPOCA ON ENVIRONMENT
This paper presents some considerations on the impact on the environment of the development compact and vertically around the old traffic arteries, an urban ecosystem. As a case study, it is analysed central area of Cluj-Napoca, the results of the measurements made and the sources of noise by monitoring noise generated by road traffic in the period 2007 -2015.
Keywords: urban, noise, pollution, car traffic, environment
Cuvinte cheie: centre urbane, zgomot, poluare, trafic auto, mediu ambiant

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32-77 CONTROLUL ŞI REDUCEREA POLUĂRII ÎN TRANSPORTURI PE RAZA MUNICIPIULUI CLUJ – NAPOCA

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Adrian – Marian JUCAN la de

CONTRÔLER ET RÉDUIRE LA POLLUTION DES TRANSPORTS DANS LA MUNICIPALITÉ DE CLUJ – NAPOCA
Ce document vise à présenter des méthodes pour contrôler et réduire la pollution dans les transports commune Cluj Napoca; la pollution en termes d’air et le son.
Mots-clés: pollution sonore, pollution de l`air, contrôle de la pollution, réduire la pollution, pollution de Cluj – Napoca

Cuvinte-cheie: poluare sonoră, poluare atmosferică, controlul poluării, reducerea poluării, poluarea oraşului Cluj – Napoca

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32-76 ASPECTE PRIVIND EFECTELE POLUĂRII AUTOVEHICULELOR ASUPRA MEDIULUI ÎNCONJURĂTOR – Studiu de caz

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Elena-Simina LAKATOS Horea-George CRIȘAN Iacob-Liviu SCURTU Oana-Adriana CRIȘAN la de

ASPECTS WITH REGARD TO THE EFFECTS OF MOTOR VEHICLE ENVIRONMENTAL POLLUTION – A case study
Pollution can be considered a major assault on the environment caused by modern man. Air pollution caused by industrial activities and road traffic has a significant impact on the health of the population, especially on those who are living in urban areas, more exactly for 80% of Europeans. It involves the emanation of organisms, which release harmful substances into the atmosphere. The amount of pollutants emitted into the air we breathe was greatly reduced once the EU has introduced policies and measures addressing air quality in the 1970s. Design and implementation of policies to address this complexity is not an easy task.
Keywords: pollution, vehicles, environmental policy, overbuilding, traffic congestion

Cuvinte cheie: poluare, autovehicule, politici de mediu, aglomerare urbană, congestie de trafic

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32-75 METODĂ DE DETECTARE A DEFECTELOR GRINZILOR ÎNCASTRATE LA AMBELE CAPETE SUPUSE VARIAŢIILOR DE TEMPERATURĂ

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Gilbert Rainer GILLICH Horia FURDUI Ion Cornel MITULEȚU la de

METHOD TO DETECT STRUCTURAL DAMAGE
IN DOUBLE-CLAMPED BEAMS IN
CHANGING TEMPERATURE ENVIRONMENT
In this paper we present a method to detect damages in beam-like structures applicable if the temperature during structural monitoring is subject of changes. Experiments are performed on a steel beam for the intact case to attain a baseline. Afterwards, measurements are performed on a beam with known damage location. Comparison is made via Minkowski distance, and the location is found with precision, proving that the developed method is applicable for beams if temperature changes are present during monitoring.
Keywords: damage detection, natural frequency, temperature, filtering, correction, experimental method
Cuvinte cheie: detectarea defectelor, frecvenţe proprii, temperatura, filtrare, corectare, metoda experimentală

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32-74 FILTRAREA ŞI CORECTAREA VALORILOR FRECVENŢELOR PROPRII ALE GRINZII DUBLU ÎNCASTRATE EXPUSĂ INFLUENŢEI VARIAŢIILOR DE TEMPERATURĂ

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Andrea Amalia MINDA Gilbert Rainer GILLICH Horia FURDUI la de

FILTERING AND CORRECTION OF NATURAL
FREQUENCY VALUES FOR A DOUBLE-CLAMPED BEAM
SUBJECTED TO TEMPERATURE CHANGES
This paper presents the effect of temperature changes on the natural frequencies of beams. These may have perfect or elastic restraints at ends. A temperature increase produces compressive stress and consequently a natural frequency decrease. We contrived mathematical relations to evaluate the effect of temperature for the cases of perfect rigid as well as for elastic restraints. If the beam is imperfect, i.e. anisotropic, non-homogeneous or not strength in the initial state, a correction term has to be employed to accurately find the frequencies. The correction method is also presented.
Keywords: natural frequencies, filtering, correction algorithm, temperature
Cuvinte cheie: frecvenţe proprii, filtrare, metodă de corecţie, temperatura

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32-73 ANALIZA MODELULUI EMPIRIC, FOLOSIND SISTEME DE EVENIMENTE DISCRETE APLICABILE PENTRU SISTEMELE DE TRANSPORT

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Mihaela Elisabeta CIORTEA la de

ANALYSIS EMPIRICAL MODEL USING DISCRETE EVENT SYSTEMS APLICABLE FOR TRANSPORT SYSTEMS
In the paper have started from a model that allows a detailed empirical analysis of causal relationships and obtaining patterns that determine the evolution of the phenomenon. The model chosen for the study is a discrete event system applicable to optimize the transport system adaptable for manufacturing systems. In order to simulate the manufacturing process we chose Visual Object Net ++ package containing pntool library, which can be done graphics modelling analysis. Given that manufacturing times are very high and difficult process simulation is conducted, we reduced schedule in accordance with the transmission system.
Keywords: discrete event systems, manufacturing, analysis model
Cuvinte cheie: sisteme cu evenimente discrete, de fabricație, modelul de analiză

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32-72 TRANSPORTURI AGABARITICE. ELEMENTE TEORETICE DE PROIECTARE ȘI DATE REALE CONSTATATE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Carmen PURCAR Mircea BĂDESCU la de

OVERSIZED TRANSPORT. THEORETICAL DESIGN ELEMENTS AND REAL DATA FOUND
The paper presents the difficulty of oversized transport in the European Community due to uneven rules preparation of necessary documents from country to country. These problems lead to high costs, prolonged transport, human and financial resources inefficiently used. Two oversized transport companies, one from Serbia and one from Romania, had made 43 low loaders from Croatia to Sweden, in technical and economic limits accurate. There were made pre-transport calculations related to speed, distance, fuel consumption, maintenance costs. From data collected in the field or through the tracking of trucks are highlighted differences between theoretical calculations and actual values of transport parameters.
Keywords: oversized transport, optimization route, restrictions
Cuvinte cheie: transport agabaritic, optimizare rută, restricţii

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32-71 ASPECTE PRIVIND ACCESIBILITATEA TRANSPORTULUI ÎN COMUN ÎN MUNICIPIUL SIBIU

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Marcu FRĂŢILĂ la de

ISSUES ON ACCESSIBILITY OF PUBLIC
TRANSPORT IN SIBIU
This paper presents the analysis of the transport service of the municipality of Sibiu. It analyses time tracking for buses on two lines of transportation in Sibiu
Keywords: transportation, time tracking
Cuvinte cheie: transport în comun, interval de urmărire

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32-70 http://stiintasiinginerie.ro/wp-content/uploads/2017/05/32-70.-SOLICITAREA-LA-VIBRAŢII-A-COLOANEI-VERTEBRALE-ÎN-CONDIŢII-DE-TRANSPORT-Acxel-Emil-FARCAȘ-Mariana-ARGHIR-1.pdf

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Acxel Emil FARCAŞ Mariana ARGHIR la de

OSCILLATING SPINE IN CONDITIONS OF TRANSPORT
The paper contains analysis of vibration measurements on a human subject located in a vehicle. The measurements were made by categories of road: asphalt, gravel and soil. Accelerometer positions were under the seat to the lumbar spine. This paper aims to establish the transmission of vibrations occurring in a vehicle and acting on the occupants.

Keywords: vibration effects, instrumentation, medium, transducer, sat
Cuvinte cheie: vibraţii, efecte, aparate de măsură, mediu, traductor, şezut

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32-69 SIMULATOR ELECTRO-HIDRAULIC MOBIL PENTRU PROVOCAREA DERAPAJULUI LATERAL UTILIZAT PENTRU INSTRUIREA CONDUCĂTORILOR DE AUTOTURISME PARTEA II – INSTALAŢIILE HIDRAULICĂ ŞI ELECTRICĂ

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Alexandru HRISTEA Bogdan TUDOR Cătălin DUMITRESCU Corneliu CRISTESCU Ioan BĂLAN Marian BLEJAN Radu RĂDOI la de

ELECTRO-HYDRAULIC MOBILE SIMULATOR TO CHALLENGE E A SIDE SKID USED FOR

THE TRAINING OF DRIVERS

PART II–ELECTRIC AND HYDRAULIC EQUIPMENTS

 

The article presents a simulation equipment to cause side skidding of the cars, used for training/preparing for special situations of the drivers. In the second part of the article, are presented the electric and hydraulic equipment, which assure the running of the simulator, in good conditions.

 

Keywords: electro-hydraulic equipment, mobile simulator, skidding sideways operated electro-hydraulic, electro-hydraulic simulator

Cuvinte cheie: echipament electro-hidraulic, simulator mobil, derapaj lateral, acţionare electro-hidraulică, simulator electro-hidraulic

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32-68 SIMULATOR ELECTRO-HIDRAULIC MOBIL PENTRU PROVOCAREA DERAPAJULUI LATERAL UTILIZAT PENTRU INSTRUIREA CONDUCĂTORILOR DE AUTOTURISME PARTEA I – CONCEPŢIA GENERALĂ A ECHIPAMENTULUI

Această intrare a fost publicată în 2017 Arhivă Revista Volumul 32 și etichetată Alexandru HRISTEA Bogdan TUDOR Cătălin DUMITRESCU Corneliu CRISTESCU Ioan BĂLAN Marian BLEJAN Radu RĂDOI la de

ELECTRO-HYDRAULIC MOBILE SIMULATOR TO CHALLENGE E A SIDE SKID USED FOR

THE TRAINING OF DRIVERS

PART I – GENERAL CONCEPTION

 

The article presents a simulation equipment to cause side skidding of the cars, used for training / preparing for special situations of the drivers. In the first part of the article, are showed the general conception of the equipment design, main parts, technical characteristics and performances.

 

Keywords: electro-hydraulic equipment, mobile simulator, skidding sideways operated electro-hydraulic, electro-hydraulic simulator

Cuvinte cheie: echipament electro-hidraulic, simulator mobil, derapaj lateral, acţionare electro-hidraulică, simulator electro-hidraulic

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32-67 ROMANIAN ALL – TERRAIN SUPPLY VEHICLE (RATSV) – MINIROBOT DESTINAT APROVIZIONĂRII STRUCTURILOR LUPTĂTOARE DISLOCATE ÎN ZONELE MONTANE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Silviu Mihai PETRIŞOR Vlăduţ DINESCU la de

ROMANIAN ALL – TERRAIN SUPPLY VEHICLE (RATSV) – MINI ROBOT INTENDED FOR THE SUPPLY OF THE COMBAT STRUCTURES DEPLOYED IN MOUNTAINOUS AREAS

 

In the present paper the authors describe the construction of an innovative functional model of tracked mini robot intended for the supply of troops deployed in hard to reach areas, such as mountainous ones or those that involve a high degree of risk for the human operator; this is a solution meant to support the future potential construction of innovative prototypes of mini robots designed for these missions and tasks. We present in the paper the assembly, the operation and the role of the body parts chosen for the construction of the tracked mini robot variant, describing, in detail, the advantages and the opportunities to valorise this present technological product during the assigned missions.

 

Keywords: tracked mini robot, human-artificial “partnership”, modularized structure, special applications, hard to reach areas

Cuvinte cheie: minirobot şenilat, “parteneriat” uman-artificial, structură modularizată, aplicaţii speciale, zone greu accesibile

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32-66 CONSIDERAȚII PRIVIND IMPACTUL DINTRE UN PARAPET DE PROTECȚIE ŞI UN PENDUL

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Maria – Adriana CORDOȘ Mircea BEJAN la de

CONSIDERATIONS REGARDING THE IMPACT OF A PROTECTIVE BARRIER AND A PENDULUM

 

The paper presents the impact of a pendulum with a weight of 2780 kg and a road protective barrier used on the roads of Romania. Deformable parapets are very important to protect the pedestrians and the vehicles on our roads. The maximum dynamic deflection of the parapet, measured after the test was 0,240 m and 0,435 m of working width.

The barrier was deformed as expected. Damping elements have taken a large amount of energy during impact. The pendulum is used by researchers in this field. This is a very good way to track the behavior and damping elements of the barriers in the laboratory.

 

Keywords: shock test, road restraint systems

Cuvinte cheie: încercare la şoc,  sisteme de reținere rutiere

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32-65 TESTE EXPERIMENTALE PE DISCUL BIPLAN AL VANEI FLUTURE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Cristian Marius MIMIS Tiberiu Ștefan MĂNESCU la de

EXPERIMENTAL TESTS ON A BUtTERFLY

VALVE BIPLAN DISC

 

The paper present the obtained experimental results after laboratory tests on a butterfly valve biplane disc by using electrical resistive tensometry method. Measuring the variation of the sensor’s resistance through electrical methods is proportionally with its elongation and the deformation of the part of the butterfly valve disc. The measured elongations for three static loads applied on the valve disc are presented.

 

Keywords: deformations, biplane butterfly valve disc, tensometers electro-resistive

Cuvinte cheie: deformaţii, disc biplan vană fluture, tensometrie electro-rezisitivă

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32-64 REZULTATE PRELIMINARE PRIVIND UTILIZAREA METODEI CORELĂRII DIGITALE A IMAGINII ÎN STUDIUL IMPLANTURILOR DENTARE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Daniel-Tamás SZÁVA Gabriel POPA Holger HOŢA Ildikó-Renáta SZÁVA Ioan SZÁVA Pál Botond GÁLFI la de

PRELIMINARY RESULTS CONCERNING ON THE IMPLEMENTATION OF THE VIDEO IMAGE CORRELATION METHOD IN THE DENTAL IMPLANTS ANALYSIS

 

The authors, in their preliminary investigations [1; 2; 3], conceived an original testing bench, destined to human mandibles’ strain-state evaluation.

Involving the mentioned testing bench, the authors started to perform some preliminary experimental investigations in several dental implants’ behaviours.

In the described investigations, the authors some useful correlations between the dental implant’s positioning on the mandible, the applied mastication force magnitude and its relative 3D positioning with respect to the implant’s longitudinal axis.

Their next topic will consist in a searching examination of the optimal positioning of the implants, with respect to their loading conditions.

One has to underline the fact that the proposed original methodology will represent in the next period a high-accuracy approach in the evaluation of the strain-state analysis of the dental implants.

 

Keywords: dental implant, testing bench, displacement field, Video Image Correlation

Cuvinte cheie: implant dentar, stand de încercat implanturi, câmp de deplasare, Corelare Digitală a Imaginii (VIC)

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32-63 CONSIDERAȚII ASUPRA TENSIUNILOR ȘI DEFORMAȚIILOR DIN CADRELE PRESELOR DE MARE TONAJ

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Daniel Gheorghe LAKATOS Ioan VIDICAN Marius PÂSLĂ Mircea BEJAN la de

CONSIDERATIONS ON THE FRAMES STRESSES

AND STRAINS HEAVY PRESSES

 

In paper presents a theoretical study of the state of stress and strain in the machine frame framework heavy press. These frameworks are made up of a plurality of frames each comprised of two closed C-shaped elements (calipers) connected by tightening by means of threaded rods (Fig. 1)

 

Keywords: press, frame, strength, stress, deformations, thrusts

Cuvinte cheie: presă, batiu, forță, tensiuni, deformații, tirant

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32-62 APLICATII ALE METODELOR NUMERICE DE CALCUL ÎN ANALIZA COMPORTĂRII VANELOR FLUTURE BIPLANE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Cristian Marius MIMIS la de

APPLICATIONS OF THE NUMERICAL METHODS IN ANALYZE THE BEHAVIOR OF BIPLANE BUTTERFLY VALVES

 

The paper presents the elongations obtained by numerical results on a butterfly valve biplane disc by using finite element method and these values were compared with elongations resulted from laboratory tests for three levels of water pressure applied upstream the biplane disc. The comparison between two methods to determine the elongation it shows that the finite element method applied to the disc can replace electrical resistive tensometry, to compute stresses and deformations for biplane butterfly disc on an industrial scale.

 

Keywords: finite element method, disc biplane specific strain

Cuvinte cheie: metoda elementelor finite, disc biplan, deformaţii specifice

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32-61 ANALIZA STĂRII DE TENSIUNI ŞI DEFORMAŢII ÎN CORPURILE DE RULARE DE MICI DIMENSIUNI

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Gelu BĂLAN Ovidiu MILOȘ Tiberiu Ștefan MĂNESCU Vasile IANCU la de

STRESS AND STRAIN ANALYZE OF

SMALL ROTATION BODIES OF BEARINGS

 

In the paper is presented the study of tensions and strains ho appears in small radial roller bearings during the compressive strength testing caused by forces acting perpendicular to the roller generator. For modelling a roller bearing Ø 16×24 [mm] we used SolidWorks program, the tests were conducted on two types of rollers with and without defect loaded in five-speeds charging.

 

Keywords: reel, bearing, local deformation, finite element

Cuvinte cheie: rolă, rulment, deformaţie locală, elemente finite

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32-60 STUDIUL STĂRII DE TENSIUNI ȘI DEFORMAȚII ALE ROLELOR DE RULMENT PRIN MODELARE CU METODA ELEMENTELOR FINITE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Gelu BĂLAN Ovidiu MILOȘ Tiberiu MĂNESCU jr. Vasile IANCU la de

STRESS AND STRAIN STUDY OF THE ROLLER BEARINGS USING FEM METHOD

 

This paper aims to study the stresses and strains that occur in small radial bearings with rolls of Æ 7,5×15 mm diameter. We have considered five-speed charging for two distinct cases: without and with defects.

 

Keywords: roller bearing, contact voltage, strain, roll flange

Cuvinte cheie: rulment radial, tensiune de contact, deformație, rolă-placă plană

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32-59 EFICIENŢA DIFERIŢILOR ESTIMATORI AI DISIMILARITĂŢII UTILIZAŢI ÎN DETECTAREA DEFECTELOR

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Gilbert Rainer GILLICH Ionela PELEA Nicoleta GILLICH la de

THE EFFICIENCY OF SEVERAL DISSIMILARITY ESTIMATORS USED IN DAMAGE DETECTION

 

This paper deals with damage detection methods based on interpreting the results of vibration measurement. We briefly described an own method for damage evaluation, which takes into account a large number of frequencies achieved from weak axis bending modes. This allows the precise location of the defect location. We represented two histogram types, one with measurements and several resulted from calculations for possible damage scenarios. The damage location was determined with three estimators, among those the best results being attained with the Minkowski distance.

 

Keywords: damage, severity assessment, natural frequencies, vibration

Cuvinte cheie: defecte, evaluarea severității, frecvenţe naturale, vibraţii

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32-58 MODIFICAREA DISTRIBUŢIEI TENSIUNILOR ÎN ZONA DEFECTULUI ŞI EFECTUL ACESTEIA ASUPRA FRECVENŢELOR PROPRII ALE GRINZII

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Gilbert Rainer GILLICH Luminiţa PĂDURARU Marius TUFOI la de

STRESS DISTRIBUTION ALTERATION IN THE DAMAGED ZONE AND ITS EFFECT ON THE BEAM’S NATURAL FREQUENCIES

 

In this paper the relation to be used for deriving the frequency of a beam with transverse crack is tested against finite elements method (FEM) simulation results. We have first analytically derived the beam deflection and compared with results achieved by means of the FEM simulation. The good concordance was found, thus the FEM model is calibrated. Afterwards, damage of different depth was introduced in the beam and the natural frequencies derived. These values were compared against results attained by applying the proposed relation and a good fit was found.

 

Keywords: beam, damage detection, vibration, natural frequencies, deflection

Cuvinte cheie: grindă, detectarea defectelor, vibraţii, frecvenţe proprii, săgeată

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32-57 DESPRE MODIFICAREA FRECVENŢELOR NATURALE ALE GRINZILOR DATORITĂ COROZIUNII

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Emilian STANCIU Gilbert Rainer GILLICH Zeno-Iosif PRAISACH la de

ON THE NATURAL FREQUENCY CHANGES OF

BEAMS DUE TO CORROSION

 

This paper presents a relation to be used for deriving the effect of mass loss on the natural frequencies of beams. Herein the stiffness decrease is not considered, since its effect on the natural frequencies is well-known. Consequently, the beam was considered with a constant cross-section but with reduced volumetric mass density in the corroded region. By this approach, we have first analytically studied the beam dynamics from an energetic point of view and contrived the mathematical relation. Afterwards, this relation was successfully tested against FEM simulations.

 

Keywords: beam, corrosion, vibration, natural frequencies, mode shape

Cuvinte cheie: grindă, coroziune, vibraţii, frecvenţe naturale, formă modală

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32-56 OPTIMIZAREA TOPOLOGICĂ A STRUCTURILOR ÎN INGINERIE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Alexandra-Daniela SCURTU Ancuţa Nadia JURCO Horea-George CRIȘAN Iacob-Liviu SCURTU la de

TOPOLOGICAL OPTIMIZATION OF THE STRUCTURE IN ENGINEERING

 

Nowadays the rapid development of the industry required use the optimization method. First part of this study shows the structural optimization method used in mechanical enginnering, being made a detailed explanation of the iterative optimization process. In the second part of the paper is presented the CAD modelling and the topological optimization of the holder used in mechanical engineering. the results of the optmization study and the conclusions are presented at the end of this paper.

 

Keywords: topological optimization, finite element analysis, objective functions

Cuvinte cheie: optimizare topologică, analiza cu elemente finite, funcții obiectiv

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32-55 SIMULAREA NUMERICĂ A UNEI VANE DE ECLUZĂ DE LA HIDROCENTRALA PORȚILE DE FIER I

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Ioan LAZA Paul-Dan OPRIȘA-STĂNESCU Tiberiu Dimitrie BABEU la de

NUMERICAL ANALYSIS OF A LOCK VALVE

OF IRON GATE I HYDRO

 

One of the valves of the intermediate head of the lock of Iron Gate I Hydroelectric Power Station was damaged; it was replaced by another version. In order to elucidate the cause of the damage was done a numerical simulation using ANSYS Fluent software. The simulation has required the modeling of parts of channel for filling/emptying of the lock, taking also into account the hydrostatic water pressure, not just those static or dynamic. The paper presents a modeling of steady flow through the valve which is in a certain position, which shows velocity and pressure fields and the forces on the faces of the valve.

 

Keywords: lock, water navigation, valve, Iron Gate I Hydroelectric Power Station, numerical analysis, ANSYS Fluent

Cuvinte cheie: ecluză, vană, hidrocentrala Porțile de Fier I, simulare numerică, ANSYS Fluent

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32-54 METODĂ HIBRIDĂ DE STUDIU PENTRU ORICE TIP DE SECȚIUNE SUPUSĂ LA TORSIUNE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Ghiţă BÂRSAN Vasile NĂSTĂSESCU la de

A HYBRID MeTHOD OF STUDY FOR ANY SECTION

TYPE UNDER TORSIONAL LOADING

 

This paper presents a methodology regarding the numerical analysis of any section type under torsion loading. This methodology is named a hybrid one, because it practically consist in using of the membrane analogy – an experimental method –  but the solving and result analysis are made by Finite Element Method (FEM). In the modelling of a structure, of a beam, applying of the torsion moment involves some difficulties especially regarding of the local stress concentration. By the methodology presented in this paper, the analysis of the shear stress field can be made with a great accuracy using FEM, without any experimental means. This methodology takes into account all the physical significations of the membrane analogy and all these are evaluated by FEM. That require of the pressure-effort ratio to be -2 is made by a thermal loading, cooling the membrane. By post-processing, the numerical result analysis can be quickly and easily made. The modelling presented in this paper can be used for any section type: whatever the shape, no matter if the section has one or more holes etc. By this methodology, the membrane analogy becomes more efficient, more versatile and more accessible for any section type.

 

Keywords: torsion, membrane analogy, finite elements

Cuvinte cheie: torsiune, analogia cu membrana, elemente finite

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32-53 ȘCOALA DE REZISTENȚA MATERIALELOR DIN UNIVERSITATEA POLITEHNICA DIN BUCUREȘTI

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Costică ATANASIU Nicolae ILIESCU la de

SCHOOL OF STRENGTH OF MATERIALS FROM POLYTECHNIC UNIVERSITY OF BUCHAREST

 

Strength of Materials School of the Polytechnic University of Bucharest has a history of nearly 150 years attested. The paper presents the steps taken by the Strength of Materials School, closely related to evolution University, personalities that contributed to the formation and development of this school, the laboratory created and its involvement in solving of problems in economy and priority directions in research.

The conclusions of the paper highlight the conditions in which it forms a school for it to persist and grow.

 

Keywords: strength of materials, stability of construction, engineering school, electrical strain gauge technique, vibrations

Cuvinte cheie: rezistenţa materialelor, stabilitatea construcţiilor, şcoală de inginerie, tensometrie electrică, vibraţii

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32-52 STUDIU DE CAZ ASUPRA TERMOIZOLAŢIILOR CLĂDIRILOR CU MATERIALE ORGANIC – NATURALE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Doru Cristian BRATU la de

CASE STUDY ON THERMAL INSULATION IN BUILDINGS WITH ORGANIC – NATURAL MATERIALS

 

Reducing energy consumption through the thermal insulation of buildings, including insulation using materials of organic-natural origin is a current concern of specialists. The paper analyses energy rehabilitation solutions with various materials of organic-natural origin, proving the efficiency of using low density thermo isolating materials, as well as the efficiency of using small amounts of renewable primary energy in the production of said materials.

 

Keywords: building, thermal insulation, energy consumption, material, organic, natural

Cuvinte cheie: clădire, izolaţie termică, consum energetic, material, organic, natural

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32-51 DESPRE COMPANIA HEIDELBERG CEMENT ROMÂNIA S.A.

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Nicolae FÂNTÂNARU la de

REGARDING THE COMPANY HEIDELBERG CEMENT ROMÂNIA S.A.

 

The document contains the presentation of the company Heidelberg Cement Romania S.A. and its activity for carrying out sustainable constructions. The company is present in our country since 1998, with investments of over 450 million Euro, holding the honorary title of „Supplier for the Royal House of Romania“.

 

               Key words: the company Heidelberg Cement Romania S.A., sustainable constructions

Cuvinte cheie : compania Heidelberg Cement România S.A., construcții durabile

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32-50 STUDII ȘI COMPARAȚII ALE MATERIALELOR HIDROIZOLATOARE DE PROTECȚIE A INFRASTRUCTURII

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Mihaela DUMITRAN la de

STUDIES AND COMPARISONS OF WATERPROOFING MATERIALS FOR INFRASTRUCTURE PROTECTION

 

This article mainly illustrates the current situation of dedicated infrastructure materials as well as the comparison of some of them. For the waterproofing system comparison, one of the multi-criteria analysis methods was used: the Global Utility Method. The proposed analysis scenarios were: bituminous waterproofing for a continuous foundation, HDPE waterproofing for a continuous foundation and waterproofing based on additives for concrete, for a continuous foundation. Our multi-criteria analysis was based on the following features of the technology execution process: price, life span and degree of difficulty.

 

Keywords: waterproofing, foundation, multi-criterial analysis,  global utility method

Cuvinte cheie: hidroizolații, fundație, analiza multicriterială, metoda utilități globale

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32-49 ANALIZA ALUNECĂRILOR DE TEREN PRIN METODE GEODEZO-TOPOGRAFICE ȘI MODELARE 3D

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Iulia Diana GLIGA Maria-Olivia MOLDOVAN la de

ANALYSIS OF LANDSLIDES THROUGH GEODETIC-TOPOGRAPHICAL METHODS AND 3D MODELING

 

The aim of the landslides study, located on the southern slope of the Cetățuie Hill (urban zone, Gruia neighbourhood, Cluj-Napoca City) is to create a geodetic-topographic plan and documentation that can be used specifically in planning and predicting erosion of slopes. In this study case was used the topographic documentation for hazard assessment of landslides. For the plan metrical and nivelitic surveying were used national geodetic network points of support supplemented with thickening points (due to work), in order to use them as starting and closing elements for determining the survey control In order to determine the points of land used for the survey network, a Pentax R – 322NX Total Station was used. Creating a 3D model from the data collected in the field was done using TopoLT and Surfer.

 

Keywords: landslides, planning and predicting erosion, topographic plan, 3D model

Cuvinte cheie: alunecări de teren, prevenirea eroziunii, plan topografic, model 3D

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32-48 ORGANIZAREA EFICIENTĂ A RESURSELOR UMANE ŞI MATERIALE PENTRU EFICIENTIZAREA UNUI PROCES DE CONSTRUCŢIE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Dorina SUCALĂ Ilie-Nicolae SUCALĂ Mihaela DUMITRAN la de

EFFICIENT ORGANIZATION OF HUMAN AND

MATERIAL RESOURCES TO STREAMLINE

THE CONSTRUCTION PROCESS

 

Concern about duration in which a building can be achieve, has been and remains one of the main problems of any specialist in this sphere of activity. Conception, design and implementation of a project require a constant monitoring the parameters of prediction, planification and supervision way works. Company management can be considered a discipline with economic character because its purpose is increasing economic efficiency

 

Keywords: construction activities, work productivity, processes, efficiency

Cuvinte cheie: activități de construcții, productivitatea muncii, procesele, eficiența

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32-47 PRINCIPII ȘI SISTEME DE CERTIFICARE A CLĂDIRILOR ÎN CONTEXTUL DEZVOLTĂRII DURABILE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Daniela Lucia MANEA Iacob FLOREA la de

PRINCIPLES AND SYSTEMS CERTIFICATION OF BUILDINGS IN THE CONTEXT OF SUSTAINABLE DEVELOPMENT

 

The problem of constructing energy-efficient buildings and sustainable is increasingly present in recent years because their owners want to reduce energy consumption, carbon footprint reduction and maintenance costs. Created for this purpose or systems of assessment and certification of buildings in the context of sustainable development. The paper deals with the main building certification systems that are based on multi-criteria evaluation methodology following: raising awareness of the beneficiaries, design, construction, operation and promotion of integrated design practices.

 

Keywords: sustainability development, environmental certification systems, energetic efficiency, environment, pollution, building, valuation method, climate change, interior comfort

Cuvinte cheie: dezvoltare durabilă, sisteme de certificare ambientală, eficiență energetică, mediu, poluare, construcții, metodă de evaluare, schimbare climatică, confort interior

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32-46 ANALIZA TENSIUNILOR DE TURNARE ÎNTR-O PIESĂ TIP REȚEA DE CONTRACȚIE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Marius Dan CRIȘAN Tiberiu LEHENE Vasile Filip SOPORAN la de

STRESS ANALYSIS OF CASTING IN A PART NETWORK TYPE CONTRACTION

 

This paper presents a study on how the occurrence and distribution of tensions casting a piece of „network contraction” or „yoke of contraction”. It makes a comparative analysis of the results provided by the aluminium alloy solidification simulation EN AC-Al Si7Mg0,3 cast in the mould of the classic mix of training and experimental results obtained by casting the play of the same alloy and in the same conditions and by cutting its determination tensions.

 

Keywords: thermal stress, aluminum alloy, castings

Cuvinte cheie: stres termic, aliaj de aluminiu, piese turnate

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32-45 MANUFACTURAREA ADITIVĂ – TEHNOLOGIE DE PERSPECTIVĂ ÎN PROCESAREA MATERIALELOR PRIN TURNARE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Emil NAGY la de

ADDITIVES MANUFACTURING A TECHNOLOGICAL

FUTURE IN MATERIALS PROCESSING BY CASTING

 

Material processing by casting requires the use of various types of raw materials, numerous auxiliary materials, various forms of energy and technological fluids flowing through varied route in several specific types of plant and machinery. The changes that have occurred in industrial technologies for the past 20 years under the new paradigm „changing technologies under the influence of the economic, social and political” and left their mark on the field for obtaining substantial and parts by processing materials by casting. Recent decades have marked the appearance in the current industrial operation in the processing of materials, concerns more highly bound to reduce and optimize energy consumption and materials linked with improving the environment. This development has led to the widening, deepening and broadening the scope in order of the best processing methods to ensure the sustainable development as on real. As such materials processing moulding consider key issues related to the technological side and those on the economic side, but also those that are imposed by increasing quality and minimizing environmental impact. Exploring the use of additive manufacturing system based on fundamental data, analyses, measurement and experimental results the scope of this article. This analysis leads to the idea of perspective as moulding materials processing has the potential to become a driving force to achieve a sustainable society by introducing efficient production practices that contribute to a considerable decrease negative environmental impact.

 

Keywords: casting materials processing, technological, development, new procedures

Cuvinte cheie: materiale de turnare de prelucrare, tehnologice, dezvoltare, proceduri noi

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32-44 ANALIZA CHIMICĂ ȘI MICROSTRUCTURALĂ A MATERIALULUI UTILIZAT LA TURNAREA UNUI CLOPOT

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Gabriel BATIN George ARGHIR Liviu BRÂNDUŞAN la de

CHEMICAL AND MICROSTRUCTURAL ANALYSES OF

A MATERIAL USED TO CAST A BELL

 

The present study was setup to determine the chemical composition of a bell material. After 27 years of service, a bell weighting 200 kg was broken. Two solutions were proposed for the repairing: soldering using Ag (cheap, but affecting the sound quality and mechanical properties) and a melting the old bell and casting a new one (approximately 16 times more expensive, but with better properties).  An optical microscope Olympus GX51 was used to study the microstructure. The chemical composition was determined using an XRF device Olympus Delta Element. The analysis showed the presence of lead and tin in composition, close to the upper limits. The presence of lead and eutectic structure, and the porosity produced a large crack on the basis of the bell. Clusters of macro pores were observed near the surface of the bell.  The fatigue could appear on the base of this

 

Keywords: bronze, microstructure, bell material, chemical composition

Cuvinte cheie: bronz, microstructură, material de clopot, compoziție chimică

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32-43 DISPOZITIV DE RECTIFICAT SUPRAFEŢE ELICOIDALE LA SCULE AŞCHIETOARE ADAPTABIL PE MAŞINI DE RECTIFICAT PLAN CARE ARE LA BAZĂ O CUPLĂ CINEMATICĂ DE TIP ROLĂ-CILINDRU

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Alexandru-Cătǎlin MICACIU Ioan-Gheorghe VUŞCAN la de

DEVICE FOR CUTTING TOOLS TO ADJUSTED HELICAL SURFACES OF MILLING CUTTERS TO ADAPT AT  PLANE GRINDING MACHINE WHICH iS BASED ON A COUPLING KINEMATIC ROLL- CYLINDER

 

The paper presents a device for cutting tools to adjusted helical surface of milling cutters to adapt at plane grinding machine.

 

Keywords: helical surfaces clearance tooling

Cuvinte cheie: suprafeţe elicoidale de degajare la scule

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32-24 PROIECTAREA UNEI SUPRAFEȚE POMICOLE DE PRUNI ÎN SISTEM SUPERINTENSIV

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Vlad-Mihai DINU la de

THE PLUM TREE SURFACE DESIGNING

IN A SUPER-INTENSIVE SYSTEM

 

This project presents some of the benefits of a super-intensive plum orchard, a way to access European funding for technology or equipment and steps to be followed for a productive establishment

 

Keywords: plum orchard, founding, technology, importance

Cuvinte cheie: livadă de pruni, finanțare europeană, tehnologie, importanţă

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32-42 DETERMINAREA STABILITĂŢII STATICE A CUPLEI CINEMATICE EXTERIOARE CILINDRU-CILINDRU

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Alexandru-Cătǎlin MICACIU la de

DETERMINATION OF KINEMATIC COUPLING

STATIC OUTER CYLINDER

 

Helicoidally cylindrical surfaces are used for releasing surfaces of cutting tools the paper present aspects about experimental research of the kinematic coupling using different loads and different contact angle between roll and cylinder using a special developed for generation of the helical surfaces

 

Keywords: helical motion, contact pressure, contact angle

Cuvinte cheie: mișcare elicoidală, presiunea de contact, unghi de contact

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32-41 STUDIUL EROZIUNII OȚELULUI USt 37-2 PRIN CAVITAȚIE VIBRATOARE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Eduard RIEMSCHNEIDER Ilare BORDEAŞU Lavinia Mădălina MICU Liviu Daniel PÎRVULESCU Rodica BĂDĂRĂU Traian BENA la de

Erosion study of the Steel UST 37-2

by vibratory cavitation

 

The paper presents the results of the experiment cavitation vibrators, carried on carbon steel for general use UST 37-2, used in the manufacture of hydraulic turbine components, along the route of water flow into the turbine. Testing is performed on standard crystal vibrator device piezo ceramic of the Cavitation Laboratory of the University Politehnica Timisoara. OH12NDL comparison with standard steel and grey iron with pearlite structure shows that steel has low resistance to cavitation generated by the vibrator device, therefore not recommended in the manufacture of parts in areas of developed cavitation.                    Keywords: erosion, cavitation, carbon steel, average depth of erosion, erosion rate, vibrator device                   Cuvinte cheie: eroziune, cavitație, oțel carbon, adâncime medie de eroziune, viteza de eroziune, aparat vibrator

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32-40 METODE EXPERIMENTALE PENTRU DETERMINAREA REZISTENȚEI LA EROZIUNE ABRAZIVĂ A MATERIALELOR FOLOSITE ÎN FABRICAȚIA MAȘINILOR HIDRAULICE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Brândușa GHIBAN Carmen-Anca SAFTA Elena Crina CRÎNGAȘU la de

EXPERIMENTAL METHODS FOR TESTING OF THE ABRASIVE EROSION RESISTANT MATERIALS USED IN HYDRAULIC MACHINES MANUFACTURING

 

In the paper are reviewed the known methods applied to test the resistance of a metalic material to abrasive erosion with application to hydraulic machines espacially hydraulic pumps. Are mentioned the methods in the conformity with international standards. Article highlights the method which can be used to test and to measure the abrasive resistance of the materials used in the manufacturing of a hydraulic machine.

 

Keywords: abrasion erosion, test, wear

Cuvinte cheie: eroziune abrazivă, încercare, uzură

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32-39 STADIUL ACTUAL AL TRATAMENTELOR SUPERFICIALE CU RADIAŢII ELECTROMAGNETICE ŞI POSIBILITĂŢI DE EXTINDERE A ARIEI DE APLICABILITATE

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Ioan VIRCA la de

surface treatment on the current state

of electromagnetic radiation and

opportunities for expansion scope

 

In the presents paper the author analyses the current state of superficial treatments with electromagnetic fields, in terms of the purpose and role within the manufacturing processes of parts and ways of energy generation and transmission parts to the surface. The author presents a technological solution suite which consists in the use of gas discharge lamps what emitting pulses of optical radiation for the surface treatment of parts. This solution thus extend the surface treatments with electromagnetic fields, constituting an alternative technology that are of interest to local selective surface hardening of machine parts and for the formation of protective film, cleaning and polishing surfaces.

 

Keywords: surface treatment, electromagnetic radiation, optical radiation pulses, gas discharge lamps, hardening surface

Cuvinte cheie: tratament de suprafață, radiații electromagnetice, pulsuri de radiații optice, lămpi cu descărcare de gaz, suprafață de întărire

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