REFLECTIONS ON THE GEOMETRY VALVE PISTON INTERNAL
COMBUSTION ENGINES
This paper deals with the need to amend the exhaust valve geometry
from internal combustion piston engines.
Cuvinte cheie: supapă, temperatură, gaze de ardere
Keywords: valve, temperature, flue gas
RESEARCH FOR OBTAINING OF IRON POWDER
INJECTED PARTS
Complex shape parts of small size and made in mass production may
be economically produced by metallic or ceramic powder injection. This modern
technology considers using a multi-component binder added to a small grain
size powder (less than 40 μm). During spraying iron powder process results a
small grain size fraction, which can be used in obtaining of injected parts. There
are presented the results of our research for obtaining of parts by injection
moulding technology in present paper. Present results are referring to used
binder properties, injection conditions, resulting shrinkage after injection and
de-binding, as well as the causes of defects may appear in injected parts. It is
noticed that, in addition to the binder characteristics, the knowledge of injection
process parameters and the de-binding conditions are very important in the
injection moulding technology design in order to obtain parts without defects.
Cuvinte cheie: formarea prin injecţie, deliere, metalurgia pulberilor
Keywords: injection training, debinding, powder metallurgy
20 CERCETǍRI PRIVIND OBŢINEREA PIESELOR INJECTATE DIN PULBERE DE FIER
STUDY AND RESEARCH ON MAINTENANCE
MEANS OF TRANSPORT
The document shows the vehicle maintenance phases, in short, are
moments that need minor or major maintenance, daily care. It seeks to avoid
damage auto vehicles during the race, immobilization, thus avoiding the late of
goods or damage.
Cuvinte cheie: mentenanţă, autovehicule, reparaţii, fiabilitate
Keywords: maintenance, vehicles, repair, reliability
THE STRAIGHT LINE DERAILMENT OF RAILWAYS MOTOR
VEHICLES DUE TO CLIMB UP OF THE DRIVING WHEEL
OVER THE RAIL
The derailments due to climb up of the driving wheel onto the top of
the railhead are between the most common causes of railway accidents. Wheel
flange climb derailments occur in situations where the wheel experience a high
lateral force Y, or when vertical force Q is reduced on the flanging wheel and
Nadal’s Y/Q ratio limit is exceeded for a certain time duration limit.
Cuvinte cheie: deraiere, raport de deraiere, pseudoalunecare, sarcina
pe roată, forţa laterală
Keywords: derailment, relative to derailment, slips the false, task force
on the wheel side, lateral force
RAILWAY VEHICLE DINAMICAL BEHAVIOR
SIMULATION WITH ADAMS/RAIL SOFTWARE
Numerical methods are widely used in purpose to predict the behaviour
of a railway vehicle. Among numerical applications less known are MBS
software.
Cuvinte cheie: MBS, Adams/Rail, vehicul feroviar, dinamică
Keywords: MBS, Adams\/Rail, rail vehicle dynamics
23 SIMULAREA COMPORTAMENTULUI DINAMIC AL VEHICULELOR FEROVIARE CU AJUTORUL
FREIGHT WAGON USED FOR FACTORY TRANSPORT
COMPRESSION BUFFERS SIMULATION USING FINITE
ELEMENTS METHOD
Finite elements method is one of most powerful instrument of the
mechanical engineer do its versatility. Finite element method was developed by
aeronautical engineers but since his appearance the method was use also in
other fields like automotive, civil engineering etc.
Cuvinte cheie: vagon de marfă, cale ferată uzinală, elemente finite
Keywords: freight wagon, the railroad of the plant, finite elements
THE ROLLING OF A DRIVING WHEEL ON THE RAIL
IN LOW ADHERENCE CONDITIONS CAUSED
BY PRESENCE OF A CONTAMINANT
One of the most important factors for providing the rolling safety
conditions of the rolling stock is adherence. A certain level of adherence is
imperative in traction and breaking processes. When low adherence between
wheel and rail occurs, many negative factors can arise, such as: defects on
wheels and rails, station platform overruns, signals passed at danger and even
collisions. Among the causes that get to decrease wheel-rail adhesion is natural
contamination. The major adherence reducers are: water, rust, oil and leaves.
Cuvinte cheie: aderenţă, coeficient de aderenţă, contact de rulare
roată-şină, viteză de alunecare, contaminant
Keywords: adhesion, adhesion, coefficient of rolling contact wheel-rail,
sliding speed, that contaminates
ANALYSIS OF THE MAIN RESOURCES OF THE EARTH
THROUGH THE CONCEPT OF SUSTAINABLE
DEVELOPMENT ACKNOWLEDGES
The paper is reviewing data from specialized literature regarding
intense anthropic systems. The development of urban-industrialized areas and
impact on two of the basic natural resources: water and energy were analysed.
It discusses a modern concept of water footprint on finished products
and changes in energy consumption by the global distribution of natural
resources.
Cuvinte cheie: dezvoltare durabilă, resurse ale Pământului,
ecosisteme, apa, energie
Keywords: sustainable development, Earth resources, ecosystems,
water, energy
INDUSTRIAL SITES BETWEEN RENOVATION
AND REFURBISHMENT
In this work are presented the main characteristics of how to transform
an industrial site into a sustaineble community or industrial entity without
affecting building character. Keeping an identity to a site helps preserve the
history. A well built community relies on sustainebility of it’s interventions and
on it’s inhabitants.
Cuvinte cheie: sustenabilitate, energie regenerabilă, reconversie
industrială
Keywords: sustainability, renewable energy, industrial conversion
SUSTAINABILITY – ASSESSMENT CRITERIA FOR
BIO-BASED PRODUCTS
In recent years the societal pressure to address the issues of climate
change and fossil resources ineluctable depletion has significantly increased.
The main reason of the recent interest in bio-based products is due to the origin
of the materials (wholly or partly derived from biomass) and the development of
new functionalities of the final products. The use of bio based raw materials
could be beneficial with reference to two current problems: fossil resources
depletion and climate change. Efficient use of all available resources and
responsible utilization of renewable carbon is a way to participate to this
reduction.
The currently available biomass is consumed in different segments:
food and feed production, power and heat generation, biofuel production and
industrial applications.
Cuvinte cheie: biomasă, produse de origine biologică, criterii de
durabilitate
Keywords: biomass, bio based products, sustainability criteria
28 DEZVOLTARE DURABILĂ – CRITERII DE EVALUARE PENTRU PRODUSELE DE ORIGINE BIOLOGICĂ
EVALUATION OF PLASTICS RECYCLING OF TERMS OF
ECO-EFFICIENCY
Modern technology requires a systematic approach according to which
materials engineers are involved directly or indirectly related to compliance with
product strategy to report the use of materials from traditional and new. Today
plastics are generated from a variety of sources and large amounts of material
are deposited, resulting in difficulties in storage. Industrial processing or
storage of plastics is extremely difficult and has become a social problem in
recent years. Recycling of plastics can be a solution for the reduction of
environmental impact and efficient use of natural resources limited and the
process of exhaustion. Implementation of a new technology for recycling of
plastics can be problematic due to significant differences in costs related to the
weight of the components of the eco-efficiency analysis system that must be
customized. Advanced recycling of plastics contributes significantly to
enhanced environmental management implementation that allows environment
and economy to coexist harmoniously in a sustainable development paradigm
of the beginning of this century.
Cuvinte cheie: mase plastice, reciclare, impactul asupra mediului
Keywords: plastics, recycling, environmental impact
29 EVALUAREA RECICLĂRII MATERIALELOR PLASTICE DIN PUNCT DE VEDERE AL ECO-EFICIENŢEI
MANAGEMENT AND RECICLING OF ELECTRONIC WASTE
In this paper we present the waste electrical and electronic equipment
(WEEE), obsolete, which is one of the highest rates of growth at the global
level. The recycling of waste electrical and electronic equipment can be
profitable when the constituent materials are recovered in the recycling
process. Waste electrical and electronic equipment, plastics and a range of
common metals (Cu, Pb, Cd, Cr, etc.) also contain precious metals: Au, Ag, Pt,
as well as rare material: indium, gallium and rare earth. In this paper are
presented and issues related to management systems and recycling process of
waste management of electrical and electronic equipment.
Cuvinte cheie: metale preţioase, materiale limitate-deșeuri de
echipamente electrice și electronice, colectare, reciclare
Keywords: precious metals, materials limited-waste electrical and
electronic equipment, collection, recycling
METHODS OF REDUCING THE OPERATING COSTS FOR
WASTEWATER TREATMENT IN RURAL SETTLEMENTS
This paper represents an analysis of the development of sewage treament
plants, in Romania, for the next decade. It also describes the current solutions
to reduce operating costs for wastewater treatment. Although current solutions
are viable for large capacity wastewater treatment plants, they are not efficient
for small capacity water treatment plants from rural areas. This paper identifies
unconventional and extensive technologies of wastewater treatment as optimal
solutions for rural settlements. One of these technologies is the constructed
wetlands. Identifying and understanding that constructed wetlands are the
optimal solution for rural settlements is an important milestone for the aiming to
reduce the energy costs at national level and thus reduce the risks related to
environmental pollution.
Cuvinte cheie: așezări rurale, platouri dinamice, zone umede construite,
tehnologii neconvenționale, extensive
Keywords: rural settlements, plateaus, constructed wetlands,
unconventional technologies, extensive
31 METODE DE REDUCERE A COSTURILOR DE EXPLOATARE PENTRU STAȚIILE
ОПЫТ ЭНЕРГЕТИЧЕСКОГО ИСПОЛЬЗОВАНИЯ
СОЛОМЫ В РЕСПУБЛИКЕ МОЛДОВА
Располагаемый энергетический потенциал соломы в Республике
Молдова составляет 4…10 % от общего энергопотребления. Средняя
влажность сжигаемой соломы составляет 10,09 %, средняя теплота
сгорания – 14,47 MJ/kg. Котлы работают с к.п.д. в 1,5…2,0 раза ниже
паспортного. Выбросы парниковых газов сокращаются за счет замещения
природного газа соломой на 400…500 kg CO2eq на тонну соломы. С
ростом номинальной теплопроизводительности котла на 100 kW
себестоимость производимого тепла снижается на 6…8 %.
Cuvinte cheie: paie, cazan, randament, emisii
Ключевые слова: солома, котел, к.п.д., выбросы
CARDS RECYCLING
Increased use of different materials in the manufacture of products
alongside scale use increasingly larger plastics led to the complex problems
related to recycling at end of life. Reducing the amount of material deposited is
a goal that should be taken into consideration at all times complies in recycling
of materials in accordance with the law more restrictive. Explore the possibility
of reducing plastics recycling materials from cards stored results represents the
desire of this article. Based on the analysis and determinations are capabilities
and experimental results illustrated the fundamental data about recycling of
materials in reducing the amount of plastic land filled.
Cuvinte cheie: materiale de reciclare, reciclare, impactul de mediu,
carduri reciclabile
Keywords: recycling, materials recycling, environmental impact,
recycled cards
MINIMIZING THE IMPACT GENERATED BY HAZARDOUS
WASTE LANDFILLS ON THE ENVIRONMENT IN CLUJNAPOCA
MUNICIPALITY BY THE TRANSPOSITION OF E.U
LEGISLATION
The environmental impact generated by hazardous waste landfill is a
special issue due to the degree of hazard posed, so it requires special
attention. This paper aims to present the evolution of hazardous waste landfills
and the strategy of minimizing the environmental impact and human health
through the EU legislation transposed into the national context.
The study is based on the measures taken by the trader to a hazardous landfill
following the transposition of the European Directive 99/31/EC on landfill.
In the municipality of Cluj-Napoca, hazardous waste landfill belonging
to the society of Terapia, was considered non-compliant in the 349/2005 law
context. As a result of the adoption of the European legislation, has made a
comparative study of standards of hazardous waste in the municipality of Cluj-
Napoca before and after the implementation of the European Directive
99/31/EC.
Cuvinte cheie: impact, deşeuri periculoase, factori de mediu, directiva,
minimizarea impactului asupra mediului.
Keywords: impact, hazardous wastes, environmental factors, directive,
minimizing the environmental impact
INFLUENCE ENTRANCE FACTORS RESEARCH
TO IONIC-ELECTRONIC PURIFICATION
A VENTILATION AIR
The paper includes the results of a theoretical study, achieved by
comparing media selection method, using dispersion analysis, in which we
chose emphasizing the input factors influenced, to achieve separation of
mechanical particles of ventilation air by electrical methods, and the
establishment of a mathematical model that would adequately describe the
process of separation studied.
Cuvinte cheie: câmp electric, electrozi injectori, intensitatea câmpului
electric, vânt electric
Keywords: camp, injectori electrodes, electric field intensity, wind
electric
INFLUENCE ENTRANCE FACTORS RESEARCH
TO IONIC-ELECTRONIC PURIFICATION
A VENTILATION AIR
The paper includes the results of a theoretical study, achieved by
comparing media selection method, using dispersion analysis, in which we
chose emphasizing the input factors influenced, to achieve separation of
mechanical particles of ventilation air by electrical methods, and the
establishment of a mathematical model that would adequately describe the
process of separation studied.
Cuvinte cheie: câmp electric, electrozi injectori, intensitatea câmpului
electric, vânt electric
Keywords: camp, injectori electrodes, electric field intensity, wind
electric
RESEARCH AND DEVELOPMENTS ON NOISE POLLUATION
IN INDUSTRIAL ENVIRONMENTS
The document shows the importance of studying and research the
phenomenon of noise pollution which is a current issue both internationally and
nationally, because it affects people and causes so-called occupational
diseases. But we have to consider that the main source of noise pollution is
industrial environment.
Cuvinte cheie: poluare sonorǎ, impactul zgomotului, mediul industrial
Keywords: pollution, noise, impact sound environment design
37 STUDII ŞI CERCETĂRI PRIVIND POLUAREA FONICĂ ÎN MEDIUL INDUSTRIAL
CONSIDERATIONS ABOUT POWER INCREASING AND
NOISE REDUCTION FOR LOW POWER WIND TURBINES
WITH TURBINE BLADE WITH A WINGLET
The low power wind turbines are being designated for locations that
have as a characteristic a moderate wind regime. These are placed in the
proximity of human habitation, where is necesary to reduce the aerodynamic
noise. Adding a winglet bended towards upstream side to the existing blade
increase the force distribution on the blade and increase the produced power.
The winglet bended towards downstream side reduces the aerodynamic noise.
Cuvinte cheie: turbine de vânt de mică putere, zgomot aerodinamic,
capătul paletei, vizualizări în tunel aerodinamic
Keywords: low power wind turbines, aerodynamic noise, winglet,
visualizations in aerodynamic tunnel
ASPECTS OF THE ANALYSIS OF NUISANCES OF
POLLUTION PRODUCED BY MEANS OF TRANSPORT
The work shall be having some ways of analysis of the chemistry of
internal combustion engines of the means of transport. The results obtained
allow the assessment variation in time of noise nuisance concentrations in the
atmosphere free.
Cuvinte cheie: difuzia gazelor, concentraţie, coeficient de difuzie,
gradienţi de concentraţie, nor poluant, elemente finite
Key words: diffusion, gas concentration, diffusion coefficient, the
concentration gradients, cloud, finite elements
39 ASPECTE PRIVIND ANALIZA FENOMENELOR DE POLUARE PRODUSĂ DE MIJLOACELE DE TRANSPORT
RESEARCH AND DEVELOPMENTS ON NOISE
POLLUATION IN THE TRANSPORTS
The document shows the importance of reducing noise pollution from
transport and to identify the factors underlying pollution. There are applied to
Cluj-Napoca municipality because it is one of the busiest cities from Romania
Cuvinte cheie: zgomot, frecvenţă, intensitate sonoră, poluare sonoră
EXPERIMENTAL DETERMINATION OF PROFESSIONAL
NOISE, WITH WORKERS HEALTH IMPLICATIONS
This paper presents measurement results of noise level emitted by a
lathe and effects of noise on health worker. It was noted that in some
circumstances the maximum allowable is exceeded which requires the use of
means of protection.
Cuvinte cheie: zgomot profesional, maşini-unelte, afecţiuni auditive
Keywords: noise, machine tools, auditory disorders
41 DETERMINAREA EXPERIMENTALĂ A NIVELULUI ZGOMOTULUI PROFESIONAL, CU IMPLICAŢII
FUZZY TECHNIQUE – EVALUATION METHOD OF NOISE
POLLUTION IN THE BISTRIŢA MUNICIPALITY
This paper contains a new method for the noise pollution study based
on the fuzzy technique, applied to the Bistriţa municiplaity. This method was not
used until this moment for the noise study, but this is a very good method
because it is a non invasive method end can be applied with succeful for the
noise pollution study. This aspect will be demonstrate in this paper.
Cuvinte cheie: poluare sonorǎ, tehnica fuzyy, metoda neinvazivǎ
Keywords: pollution sound, fuzyy technique, method noninvasive
DETERMINE IF NOISE ATTENUATION USE
A VERTICAL PANEL
This paper presents a taking the case of highway model consists of 4
lanes, avad 3.75 m on each band, two emergency lanes and a 3 m wide range
depasare separation between the meanings of 2.5 m Was defined attenuation
provided by a vertical panel with a height of 2, 2.5, 3 and 3.5 m, mounted on
the edge of highways on the frequency range 62.5 – 500 Hz.
Cuvinte cheie: panou vertical, ecranare acustică
Keywords: vertical panel, acoustic shielding
CAPTURING SOLAR ENERGY AND ITS USE FOR
WATER HEATING AND HELIOSTRATIFICAREA
COVERS OF GRAFTED VINES
Energy is one of the foundations of national economies of various
countries. Climate stability can be retrieved by switching to an energy economy
based on fossil fuels to one based on renewable energy sources (wind-wind,
Sun-capturing solar energy, biomass, same time) and hydrogen.
Use of renewable energy is developed a new technology in the field of
wine helio-layering. The new technology is based on the principle of using solar
energy (radiation) in the process of layering of vine cuttings. The basic principle
of this technology is capturing solar energy (radiation), magazinarea and
transporting them to the consumer – thermal heated mats with termoagentwater
Cuvinte cheie: energetică, energie solară, heliostratificarea, butași de
vie, covorașe termice încălzite cu apă
Keywords: energy, solar, helio-layering, seedlings, mats, heated with
thermal water
ISSUES REGARDING THE TRANSFER OF MODELLING
LIQUID TO WATER FILTRATION THROUGH A SAND FILTER
This paper brings study of hydrodynamic filtration laws and their
mathematical equations. Hydrological problems are formulated according
deterministic and stochastic methods. Modelling principles are presented for
solving specific hydrological issues.
Cuvinte cheie: legea lui Darcy, starea de echilibru, flux saturat, flux
tranzitoriu saturat, principii de modelare
Keywords: Darcy’s law, steady-state saturated flow, transient saturated
flow, modelling principles
WATER QUALITY-DETERMINATION OF
THE BABADAG LAKE ECOSYSTEM
Black Danube is declared the biggest natural reservation from Europe.
Due to the fact that Danube river is a water collector in Europe, it flows all the
impurities and pollutants that people discharge into rivers, which are affluent of
Danube. The present study is a warning against water pollution in the Danube
Delta, pollution that may affect biodiversity.
Cuvinte cheie: Delta Dunării, Lacul Babadag, apă poluată
Key words: Danube Delta, Babadag Lake, polluted water
SOME WAYS TO ESTIMATE OF THE RELIABILITY
OF THE CHEMICALS SPECIAL ORGANIC
This paper presents some ways to estimate the reliability of
pyrotechnic substances, explosives, fuels for rocket engines, both in storage
and during their use. Adequate valuation leads to good prevention during
operation, storage, handling, and storage and city life.
Cuvinte cheie: explozivi, combustibil, fiabilitate, funcţia de fiabilitate,
intensitatea defectelor, densitate de repartiţie
Keywords: explosives, fuel, reliability, dependability, fault, intensity
distribution density
ACCIDENTAL RELEASE NOTES ON
PETROLEUM PRODUCTS
Economic and social development requires economic benefits from
the sale and transportation of petroleum products, however, while their
consumption occurs a negative impact of oil spills both in terms of economic,
social and environmental impacts.
Cuvinte cheie: poluare, produse petroliere
Key words: pollution, petroleum products
THE USE OF WATER SPRAY IN FIRE FIGHTING
The intervention of fire fighting teams requires a series of activities
with the aim of limiting propagation and fire extinction. In the operational
procedures of intervention, setting distance and safety measures takes an
important place. The spray water facing the thick smoke may remove some of
its components and allow better local visibility to discover focus and act on it
directly, eliminating unnecessary water consumption. Using water spray is
important for fire safety and in terms of reducing the amount of water used.
Cuvinte cheie: apă, jet pulverizat, incendiu
Keywords: water, jet spray, fire
FIRE SMOKE EXHAUST SYSTEMS AND
EQUIPMENT USED IN HOTELS
This paper present some aspects regarding fire and smoke movement
in a hotel building and which are the smoke control methods to ensure the fire
safety of the building and fire protection of its occupants. Also, will be presented
subjects as smoke and exhaust ventilation systems and equipment used in
hotels and what role ventilation plays when a fire occurs in a hotel, which are
the interaction with other fire protection systems and other building systems.
Cuvinte cheie: securitatea la incendiu, evacuarea fumului, hotel,
incendiu
Keywords: fire safety, smoke evacuation, hotel, fire
NOTES ON THE MATHEMATICAL MODELING IN
QUASI-DYNAMIC REGIME OF A CLASSES
OF MICROHYDROTURBINE
The paper presents an analysis of the behavior of a special class of
micro turbines – the cross flow hydraulic turbines, also called Banki – Michell
turbines in cvasi–static and dynamic regimes.
Cuvinte cheie: modelare matematică, microturbine, regimuri cvasi
statice, regimuri dinamice
Keywords: mathematical modelling, quasi static micro turbine,
regimes, dynamic systems
FLOW OPTIMIZATION IN HYDRAULIC TURBINES BY
NUMERICAL COMPUTING METHODS
The increasing need of green energy on the daily market [1] leads to
the optimization of the design approach of hydraulic machinery, Kaplan and
Francis turbines as well. The required costs (test rigs and time spent) to test
experimentally the hydraulic performances of several technical solutions for a
particular model of a power plant shows that a better way would be to develop
numerical techniques for hydrodynamics optimization. This would increase the
energo-cavitational performances for the studied hydraulic models.
Cuvinte cheie: turbine Kaplan, turbine Francis, optimizare numerică,
dezvoltare de software, analiza rapidă a curgerii
Keywords: Kaplan turbines, Francis turbines, numerical optimization,
software development, fast flow analysis
52 OPTIMIZAREA CURGERII ÎN TURBINELE HIDRAULICE CU AJUTORUL CALCULULUI NUMERIC
RESULTS OF COMPUTATIONAL FLUID DYNAMICS
SIMULATION THROUGH HYE 10a CROSS-FLOW TURBINE
In this paper are presented the results of CFD simulations performed
on turbine named HYE 10, made at the S.C. Hydro Engineering SA Resita. The
cross-flow turbine equips a micro-hydro power unit with 8.25 kW calculated
hydraulic power.
Cuvinte cheie: rezultate, simulare computerizată, curgere, putere
hidraulică, 8,25 kW
Keywords: results, computational fluid dynamics, flow, hydraulic power,
8.25 kW
53 REZULTATE ALE SIMULĂRII COMPUTERIZATE A CURGERII PRIN TURBINA CROSS-FLOW TIP HYE 10a
AN ATTEMPT TO FORM AN ICE PLUG ON HORIZONTAL
PIPE SECTION INTO LOW PRESSURE HYDRAULIC
EXPERIMENTAL LOOP
In the pipe-line installation, using fluids in liquid state at maximum
temperature of 30°C, the ice plugging technique assumes to form an ice plug
under controlled process inside of horizontal pipe line. The ice plug is
maintaining until completion of the maintenance / repair works made in circuit
without shut-down installation. Development of such applications by the
Institute for Nuclear Research assumes to perform design works, elaboration
and qualification of fabrication/ testing technology for some applications
considered as representatives and accumulation of experience required for
handling at detail level of ice plug primary forming and local extension for few
flow agent types used in domestic and industrial installations.
The paper describes a constructive and functional description of the
experimental technological facilities. The first results and some conclusions are
presented. The paper is dedicated to specialist working in the research and
technological engineering.
Cuvinte cheie: oprirea curgerii, dispozitiv de formare dop de gheaţă,
apă demineralizată, transfer de masă
Key words: cutting-off the flow, ice plugging device, demineralised
water, mass transfer
ANALYTIC AND EXPERIMENTAL METHOD FOR
DETERMINATION OF CONVECTIVE HEAT
TRANSFER COEFFCIENT
This paper describes how analytic and experimental method for
determining the heat convection coefficient for a cylindrical wall placed
horizontally and warmed on the inside. Analytical method consists in calculating
the criteria of similarity (invariants) describing the phenomenon of thermal
convection, and by experimental method taking into account heat transfer by
free convection and radiation between the wall and the environment.
Cuvinte cheie: convecţie liberă, coeficient de convecţie termică,
criteriu de similitudine, metodă experimentală
Keywords: free convection, convection heat transfer coefficient,
similarity criterion, experimental method
INITIATION/COMMENCEMENT OF A FIRE.
RELATED CONCEPTS – part IThe
article shall be issued on the main concepts of specific fire:
initiation and commencement of a fire; related conditions necessary for selfmaintenance
mechanism for initiating/development of a fire; the concept of
fire/fire/burning/combustion-controlled controlled; the concept of uniqueness of
initiation/development of a fire; prevent initiation/development of a fire; the
concept of extinction in case of a fire.
Cuvinte cheie: incendiu, inițiere, post-inițiere, auto-intreținere,
prevenire, stingerea unui incendiu, concepte
Keywords: fire, initiation, after the initiation, maintenance, fire
prevention, extinguish a fire, concepts
INITIATION/COMMENCEMENT OF A FIRE.
RELATED CONCEPTS – part II –
The article shall be issued on the main concepts of specific fire:
initiation and commencement of a fire; related conditions necessary for selfmaintenance
mechanism for initiating/development of a fire; the concept of
fire/fire/burning/combustion-controlled controlled; the concept of uniqueness of
initiation/development of a fire; prevent initiation/development of a fire; the
concept of extinction in case of a fire.
Cuvinte cheie: incendiu, inițiere, post-inițiere, auto-intreținere,
prevenire, stingerea unui incendiu, concepte
Keywords: fire, initiation, after the initiation, maintenance, fire
prevention, extinguish a fire, concepts
INFLUENCE DU TYPE ET DES PARAMÈTRES
FONCTIONNELS DE L’APPAREIL VIBRATOIRE SUR
L’ÉVOLUTION DE L’ÉROSION DE LA CAVITATION
L’ouvrage analyse les différences créées par cavitation produite dans
deux appareils vibratoire avec différents paramètres de fonctionnement. Les
deux appareils, notés par T1 et T2, sont dans le Laboratoire de Cavitation dans
l’U.P. Timisoara. Les recherches effectuées montrent que la profondeur et la
zone de la surface érodée sont dépendantes de la forme et la taille du nuage
de la cavitation, attaché à l’échantillon. Les conclusions montrent que la
profondeur d’érosion est principalement déterminée par l’amplitude des
vibrations et l’expansion de la surface érodée de la fréquence de vibrations.
Cuvinte cheie: eroziunea de cavitaţie, diametru mediu a suprafeţei
erodate, amplitudinea şi frecvenţa de vibraţie, dispozitivul de încercare,
microstructura din oţel inoxidabil
Mots-clés: l’érosion de la cavitation, diamètre moyen de la surface
érodée, l’amplitude et la fréquence des vibrations, l’appareil du test, l’acier
inoxydable, microstructure
CONSIDERATIONS REGARDING THE DESIGN MODERN
SOLUTIONS OF THE BUTTERFLY VALVES
WITH THE BIPLANE DISK
The present work has the purpose to analyse the modern solutions
regarding the design of the butterfly valves with biplane disk. The work is
divided in two parts:
1. Butterfly valve general assembly.
2. Butterfly valve.
Cuvinte cheie: vană fluture, disc biplan, corp vană, etanşare, soluţii
constructive.
Key words: butterfly valve, biplane disk, valve body, sealing,
constructive solutions.
59 CONSIDERAŢII PRIVIND SOLUŢII MODERNE ÎN PROIECTAREA VANELOR FLUTURE CU DISC BIPLAN
CONSIDERATION OF THE STUDY BY THE
METHOD LAYER TERMOGAZODINAMICE PROCESSES
LIMIT DYNAMIC AND HEAT SHIELD OF THE FIREARMS
This paper presents a study analytically, by means of dynamic and
thermal boundary layer processes occurring inside termogazodinamice and
muzzle, during firing guns.
Cuvinte cheie: proces termogazodinamic, strat limită dinamic şi
termic, jet de gaze, forţe de vâscozitate
Keywords: termogazodinamic process, dynamic and thermal boundary
layer, jet, force gas viscosity
THE INFLUENCE OF THE TYPE AND FONCTIONAL
PARAMETERS OF THE VIBRATOR APPARAT UPON THE
EVOLUTION CAVITATION EROSION
This paper analyses the behaviour and resistance to cavitation for two
stainless steels with biphasic structures of austenite and martensite, in different
proportions.
The two steels have the similar content of nickel, but different
chromium and carbon. Degradation of the investigated surface is accomplished
by vibratory cavitation, produced in the piezoceramic crystal device T2, located
in Cavitation Laboratory, University Polytechnic Timisoara.
The research results are presented in the form of penetration speeds
erosion, the experimental points and the approximation analytical curves, as
well as the photos for the profile breakings, in a given section The conclusions
show that the steel, with higher carbon content and lower of the chrome, has a
superior strength and the behaviour of the lower carbon content and higher
chromium, although, the latter has a higher proportion of the martensite,
constituent considered with the highest resistance to cavitation.
Cuvinte cheie: eroziunea de cavitaţie, oţel inoxidabil, microstructură,
compoziţie chimică
Keywords: erosion of the cavitation, stainless steel, microstructure,
chemical composition
ASPECTS OF AIRCRAFT WITHOUT PILOT
The paper presents some aspects regarding the development of
unmanned aircraft (UAV – Unmanned Aerial Vehicle).
Cuvinte cheie: vehicule aeriene fără pilot, dronă aeriană, elicopter
Mini-UAV
Keywords: aircraft without pilot, aerial drone, helicopter Mini-UAV
GRIDS FROM AIRCRAFT These first papers try to describe the beginning of electrical systems and their development in the aeronautically field. We described the power systems and their parameters, the influence of different perturbations against on-board systems and make consideration about the use of magnetic circuit with permanent magnets based on rare earth in aircraft manufacturing. Cuvinte cheie: sisteme electroenergetice de bord, perturbaţii, magneţi permanenţi, performanțe Keywords: power systems, noise, permanent magnets, performing
APPLICATIONS OF PERMANENT MAGNETS IN THE
INDUSTRY. PERMANENT MAGNET. CHOICE. STABILITY
These second papers try to describe the behaviour of permanent
magnets in front of the influence of different perturbation against them, and few
methods to limitate or eliminate their effect. We’ve talked about magnetic
stability and we tryed to plot the behaviour in time of permanent magnets for
different work temperature.
Cuvinte cheie: magneți permanenți, temperatură de lucru, pământuri
rare, performanțe
Keywords: permanent magnets, working temperature, rare earths,
performing
64 APLICAŢII ALE MAGNEŢILOR PERMANENŢI ÎN INDUSTRIE. MAGNETUL PERMANENT.
END-CYLINDRICAL MILLING CUTTER FOR
ALUMINIUM AND ALUMINIUM ALLOYS MACHINING, WITH
HARD TIPS, SHARPENED AFTER A NEW GEOMETRY
It was proposed as technical innovation – technical improvement – an
end-cylindrical milling cutter with a cylindrical handle, two teeth with hard tips,
shaped after a new geometry, for aluminum and aluminum alloys, having: α =
12°, β = 56°, and γ = 22°, 120 mm diameter, in 1962. The milling cutter of this
or modified shape (3 teeth, 200 mm diameter) was used for roughing and
finishing of aluminum and aluminum alloy parts for many years, up to present
paper (50 years). Recommended working regime is of 0.1 mm/tooth advance,
2-10 mm cutting depth, 40 m/s cutting speed. It was used the references
available in 1962, when the proposal for technical innovation was handled, with
the exception of [11, 14] issued latter.
Cuvinte cheie: Freză cilindro-frontală, plăcuţe dure, geometrie nouă
Keywords: End-cylindrical milling cutter, hard tips, new geometry
GENERATING THE T0ROIDAL WORM FOR GRINDING
THE TEETH OF FACE-GEAR OF FACE-GEAR DRIVE
The paper presents the basic elements of generating through
pro/ENGINEER application of the toroid worm for grinding the face-gear of
face-gear drive.
Cuvinte cheie: melc generator toroidal
Keywords: snail toroid generator
GENERATING OF THE PINION AND THE WHEEL FOR
KLINGELNBERG-PALLOID DRIVE THROUGH
APPLICATION Pro/ENGINEER
The paper presents the basic elements of generating the pinion and
the wheell for Klingelnberg-Palloid drive
Cuvinte cheie: roată generatoare, aplicația Pro/ENGINEER, pinion
și roată dințată cu dinți curbi
Keywords: wheel generators, software Pro\/ENGINEER, pinion and
gear with curved teeth
DETERMINATIONS OF THE GEOMETRICAL PARAMETERS
FOR THE WORM-FACE GEAR DRIVE FOR A CASE STUDY (I)
The paper presents the basic algorithm for determinations of the
geometrical parameters for the worm-face gear drive for a case study
Cuvinte cheie: parametri geometrici, angrenaj melc-roată plană
Keywords: geometrical parameters, gear worm-wheel hover