Arhive zilnice: mai 5, 2017


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

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

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

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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32-38 STAREA DE TENSIUNI ȘI DEFORMAȚII LA PERFORAREA ȚAGLELOR PENTRU ȚEVI FĂRĂ SUDURĂ

TENSION AND DEFORMATION state at billet perforation for seamless pipes

 

The paper analyses the particularities of perforation through helical rolling of filled billets to achieve blanks for seamless pipes. Also, clarify the plastic flow phenomenon caused by the stress and strain state, which determine the formation of the cavity.

 

Keywords: rolling helical cylinder bitronconic cavity, blanks, seamless, tubes (laminate tubes)

Cuvinte cheie: laminare elicoidală, cilindri bitronconici, cavitate, eboșe, țevi fără sudură (țevi laminate)

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32-37 CONTACTE ELECTRICE CU DENSITATE RIDICATĂ PENTRU CURENŢI INTENŞI PRODUSE PRIN METALURGIA PULBERILOR

ELECTRICAL CONTACTS WITH HIGH DENSITY FOR STRONG CURRENTS, MADE BY POWDER METALLURGY

 

Electrical contacts for strong currents by infiltration after sintering, was not satisfactory because the final density is much higher (11,100 kg/m3) and porosity is much lower (10.85 %). The infiltration after sintering contains: powder mixture preparation (W – 52 mass %, Ni – 2 %, Cu – 46 %, zinc stearate – 0,7 %  – 7 g), homogenization, pressing (4,5 MPa), sintering (730 and 780 oC). The green density is almost constant, with an identical porosity of the first after the end of the process (14,28 %). By infiltration the density increased drastically (10,832 kg/m3), its variations were increased also and porosity decreased (at 10.85 %). The attained density is not sufficient for electrical contacts work (11,100 kg/m3), but it is closer. Way to improve density: pressing, sintering, and repressing (10,700 kg/m3).

 

Keywords: sintered electrical contacts, W-Cu

Cuvinte cheie: contacte electrice sinterizate, W-Cu

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32-36 FINISAREA EBOȘELOR PENTRU ȚEVI DESTINATE INDUSTRIEI PETROLIERE

finising blanks for pipes intended to oil industry

 

The paper analyses the Mannesmann process of blanks rolling into pipes of a certain wall thickness and diameter. Also, is focuses on pipes finishing in the size range of 400-900 mm for the exterior diameter, used for gas and petroleum products transportation.

 

Keywords: rough pipes, rolled widening, rolling on the cork, mill Smoothing, rolled pipes

Cuvinte cheie: eboșe pentru țevi, laminare de lărgire, laminare pe dop, laminor netezitor, laminare țevi

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32-35 BRAZARE NICHEL-ALUMINIU

BRAZING OF NICKEL-ALUMINIUM

 

The brazing between nickel and aluminium plates is a very sensible process being influenced by type of used materials and by brazing devices which maintain in contact the metal plates. These brazing devices have a very important purpose, their pressure affect directly the capillarity force. If the brazing devices are too tight (like 7 bar pressure), the filler melted metal escape from the grip, causing presence of defects in the joint; if the brazing devices are not tight enough (like 5 bar pressure) the capillarity forces become weak, allowing the voids inside the joint. Therefore, it’ is optimal for a nickel-aluminium brazed joint without defects a 6 bar pressure, created by brazing devices,

 

Keywords: brazing, Ni-Al

Cuvinte cheie: brazare, Ni-Al

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32-34 CERCETĂRI ŞI EXPERIMENTĂRI PRIVIND OPTIMIZAREA REGIMULUI DE SUDARE CU ARC ELECTRIC PENTRU COMPONENTE DIN TABLĂ CU METODA GRADIENTULUI

RESEARCH AND EXPERIMENTATION ON OPTMIZING REGIME FOR WELDING COMPONENTS WITH

GRADIENT METHOD

 

The paper presents the calculation algorithm and the optimal solution calculated gradient method, an experimental program conducted on board the components of arc welding in the environment of protective gases. Welding regime parameters on variation conclusions have been drawn, then the gradient method was chosen optimum welding regime.

 

Keywords: welding duty, experimental program, algorithm, gradient method, optimization

Cuvinte cheie: regim de sudare, program experimental, algoritm, metoda gradientului, optimizare

 


32-33 STUDIU PRIVIND DEZVOLTAREA ÎN REŢEA A UNUI PRODUS NOU ÎN DOMENIUL SCULELOR AŞCHIETOARE

STUDY ON DEVELOPING IN NETWORK OF A NEW PRODUCT IN CUTTING TOOLS FIELD

 

This study describes patterns of a flexible working structure that allow researchers to react quickly to the environment, to move towards the market, to meet the needs of citizens, to assimilate and process new information in a timely manner, to be innovative and find new solutions. Designing and running a project from an idea, theme, until the prototype imposes complex requirements of the project team in general and project director/project manager – in particular.

 

Keywords: cutting tool, product

Cuvinte cheie: scule aşchietoare, produs

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32-32 PROIECTAREA UNUI DISPOZITIV DE PRINDERE COMPLIANT PENTRU PIESE CU FIXARE ÎN DOUĂ PUNCTE

DESIGN OF A COMPLIANT GRIPPING DEVICE FOR

TWO POINTS FIXING PARTS

 

Based on the structure of a technological device with applicability in mini and micro parts manufacturing industry, will present the transformation of a conventional mechanism into a compliant device. First part of the paper will bring in front the main notions from the technological device field, later on the description and the design of a compliant gripping device. This paper will continue with the simulation, device analysis and finally some conclusions to be made and future directions of the research.

 

Keywords: technological device, compliant mechanism, design, simulation

Cuvinte cheie: dispozitiv tehnologic, mecanism compatibil, proiectare, simulare

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32-31 TEHNOLOGIA DE VERIFICARE A CALITǍŢII ANGRENǍRII ÎN ANGRENAJELE MELC-ROATĂ PLANĂ CU CONTACT LOCALIZAT

GEAR MESH QUALITY VERIFICATION TECHNOLOGY

OF WORM-FACE GEAR DRIVES WITH LOCALIZED CONTACT

 

Current paper refers generally to the mesh quality verification technology of worm-face gear drives with localized contact, specifically investigating gear drives kinematic precission, as well as teeth contact pattern, as practical methods of evaluation of their quality in exploitation. Experimental results, related to this technology are illustrated through  practical examples, for some particular gear drives, subject of this investigation.

 

Keywords: worm-gear wheel contact plane with localized control kinematic precision control footprint

Cuvinte cheie: angrenaj melc-roată plană cu contact localizat, controlul preciziei cinematice, controlul petei de contact

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32-30 PRECIZIA MAȘINILOR UNELTE DE DEBITARE CU LASER

THE PRECISION OF CNC LASER CUTTING MACHINES

 

This paper present the results of theoretical researches by simulation with regard to the means to optimise the dynamic behaviour of a CNC laser cutting machines, and especially of the components of the kinematic feed chain in terms of cutting precision. The simulation results are presented both for the case of absence and for the case of the presence of technological forces as disturbance factors.

 

Key words: error, precision, numerical control

Cuvinte cheie: eroare, de precizie, cu comandă numerică

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32-29 OPERAREA MAȘINILOR-UNELTE CU COMANDĂ NUMERICĂ. ERORI DE PROGRAMARE

NC MACHINE TOOLS OPERATION.

PROGRAMMING ERROR

 

This paper appeared as a necessity, so should students who want to learn how to operate the CNC lathe and CNC milling machine. Training is performed using a program „Soft Swan” (a trial version), which we call simulator. Simulator has an interface composed of elements compatible Windows and virtual image of the machine (lathe or milling machine). The paper presents two common errors due haste, inattention and \ or inexperience.

 

Keywords: simulation, virtual image management tools, tool offset

Cuvinte cheie: simulator, imagine virtuală, managementul sculelor, ofset de sculă

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32-28 PROGRAMAREA G-CODE A UNUI PROIECT 3D

G-CODE PROGRAMMING FOR 3D

COMPUTER AIDED DESIGN

 

The present work, describe a G-Code programming for a 3D Computer Aided Design. The main program contains four sets of programs, written in chronological order, needed of piece processing operations. The case study proposes in this paper show that through a dedicated software ArtCAM package, we can wood surface from 2D to 3D. G-Code Program contains all operations to engraving by milling the selected text wooden on the plate.

 

Keywords: Computer Numerically Controlled (CNC), G-Code programming language (RS-274), Computer Aided Design, ArtCAM project

Cuvinte cheie: mașini-unelte cu comandă numerică, limbaj de programare G (RS-274), proiectarea asistată de calculator (CAD), ArtCAM proiect

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32-27 IMPLEMENTAREA METODEI HEIJUNKA ÎN CADRUL UNEI LINII DE PRODUCŢIE

HEIJUNKA METHOD IMPLEMENTATION IN

A PRODUCTION LINE

 

The implementation of modern production systems has become a necessity due to global competition and aims a better response to customer requirements, improve quality, decrease delivery times and costs. This paper aims to implement Heijunka method for increasing the performance of a production process within an automotive company in Sibiu. By implementing the method desired volumes leveling to balance inventories and customer demand.

 

Keywords: method Heijunka, production leveling, demand

Cuvinte cheie: metoda Heijunka, nivelare de producție, cererea

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32-26 CONSIDERAȚII DESPRE PRODUCȚIA DE PORUMB ȘI CALCULUL BILANȚULUI ENERGETIC AL ACESTEI CULTURI

CONSIDERATIONS ON CORN CROP

PRODUCTION AND ENERGETIC EFFICIENCY

 

Current context of energy production, the overall situation of the environment affected by hazardous emissions generated by internal combustion engines and not least prices are favouring cheaper fuel production from renewable sources The first step for obtaining bioethanol is represented by agricultural production. The paper is exploring how the cultivation conditions influence the crop levels and the economic efficiency of a corn crop in order to process it for bioethanol production.

 

Keywords: corn production, total energy production, energetic efficiency, fertilization efficiency

Cuvinte cheie: producția de porumb, producția totală de energie, eficiența energetică, eficiența fertilizării

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32-25 PROIECTAREA UNEI FABRICI DE PANIFICAŢIE

DESIGNING A BAKERY PRODUCTS FACTORY

 

In this project will present its importance and benefits of bread and others bakery products. We chose this theme because the bakery industry occupies a very important place in the food, bread is a staple food in human nutrition.

 

Keywords: bread, bakery, technology, benefits

Cuvinte cheie: lapte, panificaţie, tehnologie, beneficii

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32-23 VARIABILITATEA ELEMENTELOR MORFOMETRICE A TROFEELOR DE CERB COMUN (Cervus elaphus) DIN BAZINUL HIDROGRAFIC GURGHIU

THE VARIABILITY OF MORPHOMETRICAL ELEMENTS FEATURES COMMON DEER TROPHIES IN THE CATCHMENT GURGHIU

 

The stag (Cervus elaphus) is one of the most important species in our hunting ground areas. In the socio-economic context of our country, the common deer populations have a great significance taking into consideration both the financial benefits obtained by practicing hunting and its important niche role in the mountain and pre-mountain ecosystems. In present paper we have studied the variability of the morphometric characters of stag trophy at different ages. In order to achieve the proposed objectives, the carried out study analysed a number of 29 trophies.

The assessment of trophies was made by applying the CIC methodology and by respecting all rigors related to characters measuring and use of tools.

The data were statistically processed by calculating the variance, coefficient of variation and establishing the correlations between the morphometric characters and exposing the regression equations of these correlations.

 

Keywords: Cervus elaphu, variability, trophies of deer, morphometric characters, correlations

Cuvinte cheie: Cerb comun, variabilitate, trofee de cerb, caractere morfometrice, corelații

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32-22 MODIFICĂRILE NIVELULUI DE ENERGIE ALE FIINȚEI UMANE. INFLUENȚE ASUPRA STĂRII PSIHICULUI ȘI A STĂRII DE SĂNĂTATE

the MODIFICATION OF THE ENERGY LEVEL

OF THE human being. iNFLUENCES UPON

THE PSYCHIC STATE AND HEALTH

 

The authors intend to study how the human bio-field responds at a nonphysical stimulus. More precisely, what happens when a person, using special techniques, retire the energy from the exterior of the body through the interior, for 2-3 minutes? The authors find out that this procedure was interpreted by the energetic body as an aggression leading to a state near illness. The subject stopped his actions, not to create damages to the entire human being which could eventually require a treatment. A very important observation of the authors is that during the experiment it was noticed a tendency of hysteresis for the human being, phenomenon which the authors decided to study in the future.

 

Keywords: energy, human being, psychic state, health, Bio Well device

Cuvinte cheie: energie, ființa umană, stare psihică, sănătate, aparatul Bio Well

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32-21 FRACTALII – ÎNTRE FILOSOFIE ȘI CERCETAREA MATEMATICĂ. APLICAȚII ÎN MECANICA FLUIDELOR

FRACTALS – PHILOSOPHY BETWEEN RESEARCH AND MATHEMATICS. APPLICATIONS IN FLUID MECHANICS

 

This paper wants a foray into the world of fractals and how to discover the beauty of pure mathematics and hidden connections that it has with the world around us. Also described Fractal Vision appropriate software with which it enters the fantasy world of fractal geometry.

Keywords: fractals, mathematical modeling graphics, equation, algorithm, chaos, fluid dynamics

Cuvinte cheie: fractali, matematica, modelare grafica, ecuatie, algoritm, haos, dinamica fluidelor

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32-20 PARTICULARITĂȚI CONSTRUCTIVE ALE EJECTOARELOR ÎN CONSTRUCȚIA MOTOARELOR RACHETĂ

PARTICULARS OF CONSTRUCTION IN CONSTRUCTION EJECTORS ROCKET MOTORS

 

This paper presents some features of evolutionary parameters on fluid flow through the ejector gas dynamics.

Ejectors are devices with wide applicability gas dynamics in the technical field and especially in the military.

 

Keywords: ejector, gas dynamics parameters, chamber, ejection coefficient, fluid driven, driving fluid, turbulent flow

Cuvinte cheie: ejector, parametri gazodinamici, camera de amestec, coeficient de ejectie, fluid antrenat, fluid de antrenare, curgere turbulentă

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32-19 PARTICULARITĂŢI PRIVIND PERTURBAȚIILE AERODINAMICE ÎN JURUL CORPURILOR SUBŢIRI CARE ZBOARĂ ÎN ATMOSFERĂ

PARTICULARS RELATING TO SPEED DISTURBANCES AROUND BODIES FLYING THIN ATMOSPHERE

 

               The paper presents a contribution to the aerodynamic body of revolution movement trajectories in the thin atmosphere. As a particular case, the paper refers to flying projectiles and missiles, to customize linarite stationary movements around thin bodies of revolution.

 

Key words: projectile, rocket, potential speeds, Mach number, angle of attack

Cuvinte cheie: proiectil, rachetă, potenţialul vitezelor, numărul Mach, unghi de atac

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32-18 CALCULUL COEFICIENTULUI DE CONTRACȚIE AL UNUI ORIFICIU ȘI REPREZENTAREA GRAFICĂ A REZULTATELOR CU PROGRAMUL SIGMA PLOT

THE CALCULUS OF THE CONTRACTION COEFFICIENT OF AN ORIFICE AND THE GRAPHYCAL RESULTS REPRESENTATION WITH SIGMA PLOT PROGRAMME

 

This paper presents the continuation of the studies from the last two articles presented at the last two Sebeș conferences. The authors used the same numerical method to integrate the Navier-Stokes equations and the presentation is done this time using a Sigma Plot programme. The study is performed with a combination of symmetric and asymmetric orifices at the same Reynolds number. The authors used again the method of finite differences to determine the flow through a tank and through the contracted section of the liquid passing an orifice.

 

Keywords: flow coefficient, current lines, symmetrical orifice, asymmetrical orifice, hydrodynamic spectrum, numerical methods

Cuvinte cheie: coeficient de debit, linii de curent, orificiu simetric, orificiu asimetric, spectru hidrodinamic, metode numerice

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32-17 CONSIDERAȚII HIDRAULICE ÎN PROIECTAREA SCĂRILOR DE PEȘTI

HYDRAULIC APPROACH OF FISH LEDDER DESIGN

 

The paper presents the design restrictions of fish ladders mentioned in the literature and highlights through an example of how sizing calculation of these structures taking into account the hydraulic flow regime.

 

Keywords: weir, fish ladder, critical flow regime, Froude number

Cuvinte cheie: deversor, scară de pești, regim critic de curgere, număr Froude

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32-16 ANALIZA EFICIENȚEI DISTRIBUITOARELOR HIDRAULICE CU SERTAR CILINDRIC

EFFICIENCY ANALYSIS OF THE LIQUID

CONTROLLER WITH A RING VALVE

 

This paperwork studies the efficiency of the liquid controllers with a ring valve analysing the liquid running through the controller, the variation of the pressure and its speed for various forms of the ring valve controller.

 

Keywords: controller with a ring valve, flowing, energy lines, pressure decline, speed

Cuvinte cheie: distribuitor cu sertar cilindric, curgere, linii de curent, cădere de presiune, viteză

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32-15 INSERȚIA METALICĂ ÎN PALETA ROTORULUI DE TURBINĂ EOLIANĂ DE PUTERE MICĂ

THE INSERT OF METAL IN THE ROTOR BLADE OF

THE LOW POWER WIND TURBINE

 

Attachment of the wind turbine rotor blade is made by a metal structure, that provides a rigid mounting and precise positioning as accurate as possible to the calculated direction angle of incidence of the air flow relative to the blade profile sections. The mechanical strength at static load for the blade is within acceptable limits even without metal insert. In real operating conditions, the wind gusts have the effect of a dynamic load upon the blade and the base material, fiberglass reinforced polyester (FRP) is subjected to fatigue stressed. This leads to micro cracks in the resin and gradually reaches the blade breakage. Therefore the recessed fitting area of the blade, which is an aerodynamically inactive area, must have a metal structure with maximum adhesion to FRP of the blade structure. The shape of this structure, the way of insertion into the interior of the blade, the depth of penetration, are issues which will be discussed in this paper.

 

Keywords: insert of metal, blade, rotor, wind turbine, FRP

Cuvinte cheie: inserție metalică, paletă, rotor, turbină eoliană, PAFS

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32-14 MODELAREA UNEI PALE DE TURBINĂ EOLIANĂ BAZATĂ PE CONCEPTUL FORȚEI PORTANTE MAXIME PENTRU VITEZE VARIABILE ALE VÂNTULUI

MODELING OF A WIND TURBINE BLADE BASED ON MAXIMUM LIFT FORCE AT VARIABLE WIND VELOCITIES

 

This paper presents a new solution in the wind turbine blade modelling, based on a new concept of the maximum lift force, capable to be produced at different values of wind velocities. First are mentioned some atmospheric registered parameters into the selected area of future implementation of such wind turbine. Further some theoretical aspects are briefly mentioned, followed by the obtained results. Finally some conclusions and remarks are mentioned.

 

Keywords: Re Number, flow line, LE- Leading Edge, LT – trailing Edge

Cuvinte cheie: Număr Re, linie de curent, BA- Bord de atac, BF- Bord de fugă

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32-13 PROBLEME DE MENTENANŢĂ LA TURBINELE EOLIENE CU AX ORIZONTAL

MAINTENANCE ISSUES OF

HORIZONTAL AXIS WIND TURBINE

 

This paper presents the concepts of maintenance and especially the maintenance of onshore wind turbines. There are several types of maintenance, each of them trying to reduce the costs with repairs of wind turbine and also the losses of energy production.

 

Keywords: maintenance, wind turbines

Cuvinte cheie: mentenanță, turbine eoliene

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32-12 OBSERVAŢII PRIVIND SOLICITĂRILE PALETELOR TURBINELOR EOLIENE CU AX ORIZONTAL

NOTES ON THE MECHANICAL STRESSES OF THE

BLADES OF HORIZONTAL AXIS WIND TURBINES

 

The paper presents an analysis of mechanical stresses on the blades of a small horizontal axis wind turbine.

 

Keywords: wind turbines, forces, deformations

Cuvinte cheie: turbine eoliene, forţe, deformări

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32-11 FUNCȚIONAREA POMPELOR DIN COMPONENȚA UNUI BAZIN DE COMPENSARE A DEBITELOR DIN CADRUL UNEI STAȚII DE EPUARE A APEI

FUNCTIONING OF PUMPS WITHIN COMPONENTS OF A COMPENSATION TANK OF FLOW EXISTING IN A WATER TREATMENT PLANT

 

This paper shows the importance of which ensures the correct functioning pumps water out damage or special weather. Also shows the operation of these pumps within compensation tank ok flow.

 

Keywords: pumps, optimization, wastewater treatment plant

Cuvinte cheie: pompe, optimizare, stație de epurare

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32-10 MODUL DE RECONDIȚIONARE A UNOR AGREGATE CE ECHIPEAZĂ STAȚIILE DE POMPARE

RECONDITIONING MODE OF AGGREGATE WHAT

EQUIPS PUMPING STATIONS

 

There are presenting a new way to increase the pumping efficiency in many pumping station, concerning in pumps working service life optimization. This objective is rational according to the demand to not make inopportune investments (premature or expensive) by replacing or rehabilitating less used pumps. Other reason is to minimize or eliminate, as it possible, to keep on function massive used pumps with low efficiency.

 

Keywords: pump, rotor, reconditioning, CERAMITHECH

Cuvinte cheie: pompă, rotor, recondiționare, CERAMITHECH

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32-9 AVANTAJELE, ERORILE ȘI LIMITELE TERMOGRAFIERII ÎN INFRAROȘU UTILIZATĂ LA MENTENANȚA SISTEMELOR DE ACȚIONARE HIDRAULICĂ

THE ADVANTAGES, ERRORS AND LIMITATIONS OF INFRARED THERMOGRAPHY METHOD USED TO THE MAINTENANCE OF HYDRAULIC DRIVE SYSTEMS

 

The subject of the article is to discuss the advantages, errors and limitations of infrared thermography which can be used as a non-invasive modern method of diagnosis even in industrial applications. The method of infrared thermography diagnosis is proposed to be applied in the preventive maintenance of hydraulic drive systems.

 

Keywords: infrared thermography, preventive maintenance, hydraulic actuators, errors, calibration

Cuvinte cheie: termografiere în infraroșu, mentenanţă preventivă, acţionări hidraulice, erori, calibrare

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32-8 STUDII PRIVIND STABILITATEA STATORULUI HIDROGENERATOARELOR

HYDROGENERATOR STATOR STABILITY STUDY

 

The paper analyses the hydro generators stator stability, based on the problems that occurred during the operation of the Romanian power plants. In order to highlight the  stator components role in these problems, it is analysed the stability of the stator housing and hydro operation found in samples and tests hydro Power Plant No. 1 hydropower from Great River Retezat, where the curvature of the stator creates vibration and instability in operation. The stability of the stator in this case can be obtained by an adequate construction of the building system of the winding heads to prevent any movement of the coils during operation of the hydro. Hydro generator stator is conditional stability dynamic stability of the metal housing because the stator housing design and construction of a great height without adequate consolidation creates problems of vibration and dynamic stability housing.

 

Key words: hydro generator, vibrations, numerical tests

Cuvinte cheie: hidrogenerator, vibrații, teste numerice

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32-7 CONCEPEREA ȘI DESCRIEREA SISTEMULUI DE ACȚIONARE ȘI REGLARE AL UNEI MICROTURBINE HIDRAULICE CROSS-FLOW

DESIGN AND DESCRIPTION OF AN DRIVE AND REGULATION SYSTEM AT A CROSS-FLOW MICROHYDROTURBINE

 

This paper presents beside the practical concepts, also theoretical calculation to establish and define basic design of a drive and regulation system used regularity to micro-hydro turbine, specifically Cross-Flow. Virtual 3D designed are most modern models solutions and hydraulic drawing was used with success to achieve physical models by execution drawings.

 

Keywords: Cross-flow micro turbine, runner, flow, governor, flaps

Cuvinte cheie: micoturbină Cross-flow, rotor, debit, regulator de viteză, clapete

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32-6 DETERMINAREA PARAMETRILOR REALI DE FUNCŢIONARE A HIDROAGREGATELOR DIN CENTRALELE DE MICĂ CĂDERE

DETERMINATION OF THE ACTUAL OPERATING PARAMETERS OF THE HYDRO UNITS OF A LOW HEAD HYDRO POWER PLANT

 

The paper presents the flow rate calculation and measurement methodology for a high flow/low head hydro power plant with upstream cofferdam recesses.

At the same time, the paper presents the results of the in situ measurements of the actual operating parameters of the hydropower units, especially of the flow rate measurements carried out on the hydropower units’ no.1 and no. 2 of Robeşti HPP. The measurements have been carried out in agreement with the provisions of CEI 41/1991 [4].

 

Keywords:  discharge, efficiency, current meter method, hydro unit

Cuvinte cheie: debit, randament, metoda moriştilor hidrometrice, hidroagregat

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32-5 COMPORTAMENTUL MICROHIDROCENTRALEI AUTONOME PE FIRUL APEI SAU PE DERIVAȚIE

AUTONOMOUS MICRO-HDYRO POWER PLANT BEHAVIOR ON WATER THREAD OR WATER DIVERSION

 

This work presents the requisites for a micro hydro power plant located on a water thread or on the water branch, where the water flow determines the speed of and, implicitly, the power supplied by the synchronous tri-phased generator with self-excitation. Such a micro hydro power plant functions depending on the water flow capacity and water fall given by the penstock. The low-voltage electric energy produced by this plant is transported to the consumer through an underground power cable. The command and control of the micro hydro power plant can be automated, the sole human intervention being the opening and the close of an intake valve.

 

Keywords: micro-hydro power plant, synchronous generator, electrical energy, consumer

Cuvinte cheie: microhidrocentrală, generator sincron, energie electrică, consumator

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32-4 ASPECTE PRIVIND UTILIZAREA UAV PENTRU ORAȘE INTELIGENTE

uav use issues in smart cities

 

The paper deals with issues on expanding the use of unmanned aircraft and growth the mobility towards smart cities from 2020 to 2030.

 

Keywords: UAV, mobility, smart cities

Cuvinte cheie: UAV, mobilitate, orașe inteligente

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32-3 LOCAL’S PERCEPTION REGARDING THE TOURISM DEVELOPMENT IN TURDA

PERCEPȚIA LOCALNICILOR PRIVIND DEZVOLTAREA TURISMULUI ÎN TURDA

 

Tourism development is important for local communities mostly because it brings opportunities for economic growth, but it can also be a threat for changing the environment or the social life. The article aim is to determine the attitude of local residents from Turda towards the tourism development from their city after the Salt Mine, the most important tourism attraction, was modernized and attracted a high number of visitors. A survey was conducted among the sample population from Turda County. Results indicate that the locals have usually a positive perception regarding tourism development, but there are no particular signs that this led to a significant change in their daily lives.

 

Keywords: salt mine, personal benefits, economy development, tourism strategies, community

Cuvinte cheie: Salina, beneficii personale, dezvoltare economică, strategii turistice, comunitate

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32-2 PROTECȚIA AERONAVELOR ȘI MOTOARELOR ACESTORA LA IMPACTUL PĂSĂRILOR

aircraft protection at ENGINE BIRD STRIKE

 

„Bird Strike Prevention Systems” is defining the integrated concept of aircrafts protection at the strike with the bird and it contains measures that are taken for airplanes and also for airports. The bird strike is a dangerous and also common event, which happens often at ground or low altitude, the dangerous phases of landing/take-off. The bird strike can provoke light damage but it can also provoke engine malfunction leading to stop, with obvious consequences for the flight safe.

 

Keywords: Aircraft, engine, bird strike, hazard, mitigation

Cuvinte cheie: aeronave, motor, impact păsări, risc, reducere

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32-1 AGROTRANSILVANIA CLUSTER. AN INNOVATIVE DEVELOPMENT STRATEGY

AGROTRANSILVANIA CLUSTER. O STRATEGIE

INOVATIVĂ DE DEZVOLTARE

 

AgroTransilvania Cluster aims to become an integrative pole of the harmonious development in the region; a referential professional and institutional strategical entity on the field, recognized by business and institutional frameworks as being the most appreciated Cluster Association, both for the quality of its work and the results obtained. The main activity of the association represents the integration of all its members into a sustainable and competitive value chain that could bring notoriety and visibility to Transylvanian’s local products. One of the main objectives is to assure the entire facilities required for being a certified organism able to certified European geographical indication products (PDO, PGI).

 

Keywords: cluster, bio economy, smart specialization, value chain

Cuvinte cheie: cluster, bioeconomie, specializare inteligentă, lanț de valoare

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