Arhive zilnice: iulie 25, 2015


28-16 CONSIDERATII DESPRE SISTEMUL DE MANAGEMENT AERONAUTIC AL ERORILOR

CONSIDERATION ABOUT AERONAUTICAL ERRORS’ MANAGEMENT SYSTEM
The present paper regards elements about errors’ management system maintenance in civil and military aeronautical field. All aeronautical organisations must correlate their maintenance activities with errors’ management system, for decrease the higher risk of accident.
Keywords: maintenance, error, aeronautical
Cuvinte cheie: întreținere, eroare, aeronautică

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28-15 STUDIUL EXPERIMENTAL AL COMPORTĂRII CAROSERIILOR AUTOVEHICULELOR DE TRANSPORT PERSOANE

EXPERIMENTAL STUDY OF THE BEHAVIOR OF PASSENGER VEHICLE BODIES
It can be affirmed that the movement has emerged with the advent of motor transport. If the early use of these means of transport, traffic accidents is produced with low frequency, at the present time, due to the unprecedented increase in traffic, traffic accident has become an acute social problem. As a result, over time, it has acted in the following three major directions: the traffic Regulation by a legal system, increase the level of performance of active safety provided by the motor vehicle, increasing the level of passive safety performance ensured by the motor vehicle.
Keywords: experimental study, bodywork, vehicle
Cuvinte cheie: studiul experimental, caroserie, autovehicul

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28-14 CERCETĂRI ALE ACCELERAȚIILOR ȘI FORȚELOR DE TRACȚIUNE LA CÂRLIG ALE AUTOVEHICULELOR TOT TEREN DE TIP ATV CF MOTO

RESEARCH OF ACCELERATIONS AND TRACTION
FORCES OF ALL TERAIN VEHICLES
The present paper realizes an experimental research and comparative study of the results obtained from practical measurements with regard to acceleration, deceleration, stopping distance and dynamic behaviour, in various road conditions and surfaces, with all-terrain vehicle of the type ATV 500 CF Moto during the braking process when starting at various initial speeds. It is evaluated the stopping distance measured from the initial reference point and also the dynamic behaviour of the ATV CF-Moto 500 during the acceleration/deceleration process in the case of traction force at the rear end vehicle hook due to the 750 kg trailer. The need of studying this force is in that vehicle dynamic loading during some driving manoeuvres of braking and taking off, respectively a various situations during normal riding.
Keywords: ATV, acceleration, deceleration, traction, forces, braking
Cuvinte cheie: ATV, accelerare, decelerare, tracțiune, forțe, frânare

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28-13 POLUAREA SONORĂ ÎN AUTOVEHICULE. STADIUL ACTUAL

NOISE IN MOTOR VEHICLES. CURENT STATUS
In contrast to many other environmental problems, noise pollution continues to increase thanks to industrial, social and transportation field development. The paper analyses specific aspects on the impacts of noise on health, to identify areas for priority action and remediation measures.
Keywords: stage, vibroacustical, sound level meters
Cuvinte cheie: stadiul actual, vibroacustica, sonometre

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28-12 MODELUL MATEMATIC SIMPLIFICAT PENTRU VERIFICAREA DIMENSIONĂRII DESCHIDERILOR PENTRU EVACUARE A FUMULUI ÎN CAZ DE INCENDIU

THE SIMPLIFIED MATHEMATICAL MODEL TO VERIFY DIMENSIONING OF THE OPENINGS FOR SMOKE EVACUATION IN CASE OF FIRE
This article derives engineering equations used to calculate pressure differences across vents, as well as equations for calculating the mass flow of gases out through the vent, for several common enclosure fire scenarios. This gives information on the mass and energy balance and therefore allows calculation of such environmental consequences as hot gas temperature and smoke layer height.
Keywords: fire, smoke, ventilation, smoke vents
Cuvinte cheie: incendiu, fum, ventilare, trape de fum

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28-11 MĂSURI DE ÎMBUNĂTĂŢIRE A NIVELULUI POLUĂRII MEDIULUI ÎN TUNELURILE DIN ORAŞE

MEASURES TO IMPROVE THE LEVEL OF
ENVIRONMENTAL POLLUTION IN CITIES TUNNELS
Nowadays, many tunnels are built below underground water level. This means that, in case of a fire or oil spill there is a risk of environmental contamination of ground water supplies or sensitive recipients.
This paper purpose is to analyse the environmental consequences of a tunnel fire or an oil spill inside the tunnel.
There are presented from the beginning study of existing technologies.
Also, the paper focus on the new technologies for on-site collection and treatment of water, not to minimize the importance of in-situ treatments both prior to and after an incident, those being sustained by new mobile technologies for effective treatment.
Keywords: oil spill, water treatment, soil treatment, contamination transport
Cuvinte cheie: deversare de petrol, de tratare a apei, tratarea solului, transport contaminare

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28-10 SIMULAREA ŞI OPTIMIZAREA FLUXULUI DE TRAFIC ÎNTR-O INTERSECŢIE CU SENS GIRATORIU

SIMULATION AND OPTIMIZATION OF A TRAFFIC FLOW
IN A ROUNDABOUT
The paper presents the analyze and optimization of traffic flow in a roundabout located on the road Alba -Iulia, highway that connects central and western industrial area is very crowded especially during peak periods. Following comments from the field, calculations and numerous simulations performed with the software Synchro Studio 8 there were have proposed improvements in terms of optimizing traffic flows and changes in the geometry of the intersection to reduce delays and increase velocity.
Keywords: traffic congestion, time delays, queues
Cuvinte cheie: trafic rutier congestionat, timpi de întârziere, cozi de aşteptare

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28-9 STUDII REFERITOARE LA ÎMBUNĂTĂŢIREA ACCESULUI PERSOANELOR CU DIZABILITĂŢI LA TRANSPORTUL PUBLIC ÎN MUNICIPIUL SIBIU. GRADUL DE SATISFACERE A CERINŢELOR PERSOANELOR CU DIZABILITĂŢI. PARTEA A II-A

DEGREE OF SATISFACTION OF THE NEEDS OF
PEOPLE WITH DISABILITIES. PART II
The movement of people with disabilities is limited in the city of Sibiu, because of the lack of ramps at the entrance of buildings and in the public transportation stations, the lack of specialized elevators, ledges which are too high, and in certain areas, inaccessible cross-walks. Although the level of specialized equipment meant to help people with disabilities is limited, inclining towards insufficiency, with the help of the present research paper’s contribution, as well as that of other research papers or projects focused on the same subject, we hope that this situation will improve in the not so distant future (near future). It was made a questionnaire for people with disabilities to understand their need.
Keywords: public transport, people with disabilities
Cuvinte cheie: transport public, persoane cu dizabilităţi

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28-8 STUDII REFERITOARE LA ÎMBUNĂTĂŢIREA ACCESULUI PERSOANELOR CU DIZABILITĂŢI LA TRANSPORTUL PUBLIC ÎN MUNICIPIUL SIBIU. ASPECTE PRIVIND ACCESIBILITATEA PERSOANELOR CU DIZABILITĂŢI LA TRANSPORTUL ÎN COMUN. PARTEA I-A

ASPECTS REGARDING ACCESSIBILITY FOR PERSONS WITH DISABILITIES TO PUBLIC TRANSPORT. PART I
To have a disability is not a matter of choice. We should be more permissive and understanding with our peers who find themselves in such a situation. In the countries which have a healthy mentality, a disability does not mean failing in life because the environment in which the people with such a problem live provides them with the necessary conditions for leading a lifestyle without tremendous difficulties. This paper presents the current condition in Romania and more narrowly, the condition in Sibiu municipality.
Keywords: public transport, people with disabilities
Cuvinte cheie: transport public, persoane cu dizabilităţi

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28-7 ASPECTE PRIVIND CALITATEA SERVICIULUI DE TRANSPORT ÎN COMUN ÎN MUNICIPIUL SIBIU

ASPECTS OF QUALITY OF TRANSPORTATION
SERVICE IN SIBIU
This paper presents the analysis of the transport service of the municipality of Sibiu. It analyses several aspects of the transport network characteristics and quality of transport in Sibiu.
Keywords: transportation, route, tour, trip, punctuality
Cuvinte cheie: transport în comun, traseu, tur, retur, punctualitate

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28-6 O REZOLVARE TEHNICĂ PENTRU MĂRIREA TRAFICULUI PE DRUMURILE NAȚIONALE

EINE TECHNISCHE LÖSUNG FÜR DIE ERHÖHUNG DES VERKEHRES AUF LANDSTRASSEN
Der stetig wachsende Straßenverkehr muss unter befriedigende Bedingungen der Geschwindigkeit, der Sicherheit und der Bequemlichkeit erfolgen. Die vorliegende Arbeit beschäftigt sich mit eine Möglichkeit dem Verlauf einen erhöhten Verkehr zu durchführen können.
Es wird die Intensität des Straßenverkehrs abhängig von dem Abstand zwischen den Fahrzeugen analysiert. Dann werden erwähnt die Faktoren die zur Verringerung der Intensität des Straßenverkehres führen.
Am Ende der Arbeit wird eine Übergangslösung vorgeschlagen bis zur Vollendung des Autobahnnetzes des Landes. Diese besteht aus einem zusätzlichen Vrekehrsband mit eine Länge von 1000-1500 m wiederholt für alle 6 bis 10 km Strecke, auf welche die langsamfahrende Fahrzeuge verplichtetet sind zu verkehren. So die zusammengedrängte Fahrzeuge hinter einem oder mehrere langsam fahrenden können diese überholen und der Verkehr wird erhöht werden.
Stichwörter: Verkehr, Verkehrsintensität, Erhöhung des Verkehres, Abstand des Bremsweges, Zusätzliche Fahrspur
Cuvinte cheie: trafic, intensitatea traficului rutier, creșterea traficului rutier, distanța de frânare, bandă suplimentară de circulație

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28-5 Nicolae FÂNTÂNARU, Dan HODOR

PROTOCOL NETCONF, A NEW SOLUTION
NETWORK MANAGEMENT
NETCONF (the Network Configuration Protocol) is an emerging technology for the network management, which was conceived to respond to the challenges of the next generation networks. NETCONF is still with a limited deployment, but it is a Network management protocol with a promising capabilities. It can keep pace with Network management requirements and especially configuration management of network devices. In this article we highlight the NETCONF protocol, as a real replacement of the traditional network management protocols such as SNMP (Simple network management protocol). This paper presents an analysis of the NETCONF protocol session with practical examples, the NETCONF layered structure. In particular we analysed NETCONF protocol operations in details.
Keywords: NETCONF session, NETCONF operations, data stores, configuration management
Cuvinte cheie: sesiune NETCONF, operațiunile NETCONF, magazin de date, managementul configurației

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28-4 DIE NATIONALE KOMMISSION FÜR DAS VERHALTEN in situ DER KONSTRUKTIONEN, DIE SOGENANNTE CNCisC

COMISIA NAȚIONALĂ COMPORTAREA in situ A CONSTRUCȚIILOR – CNCisC
Articolul prezintă o motivare pentru acceptarea drept asociație de utilitate publică a Comisiei Naționale Comportarea in situ a Construcțiilor, bazată pe activitatea din ultimii 39 de ani dedicată promovării necesității de prezervare a fondului național construit, cea mai importantă și valoroasă avuție a poporului nostru.
The paper presents a motivation for the acceptance as an association of public utility referring to the National Commission in situ Behavior of Construction on the basis of its activity in the past 39 years dedicated to promotion of the necessity to preserve the national fund built, the main and most valuable treasure of our people.
Keywords: national commission, behavior of construction, association of public utility
Cuvinte cheie: comisie națională, comportarea construcțiilor, asociație de utilitate publică

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28-3 CONSIDERAŢII PRIVIND ANALIZA STRUCTURAL-DINAMICĂ PENTRU O TURBINĂ EOLIANĂ DE MICĂ PUTERE CU AX VERTICAL

CONSIDERATIONS ON THE DYNAMIC STRUCTURAL DESIGN FOR A SMALL POWER VERTICAL AXIS WIND TURBINE
The paper presents the main aspects regarding the dynamic structural design for a small power vertical axis wind turbine. The research is applied to a 3-bladed, Darrieus type, small power, vertical axis wind turbine installed on a self-standing pole. First the main sources for the dynamic forces acting on the structure are described. Then a complete investigation on the turbine structural response is done, performing a modal analysis applied to the single rotor, considering several rotational speeds. Next, taking into consideration a building integrated wind turbine, the system composed by the turbine rotor and the mast is investigated. Finally, a thorough discussion of the main implementation problems and design alternatives is presented for a building integrated wind turbine.
Keyword: small power vertical axis wind turbines, modal analysis, Campbell diagram, urban implementation
Cuvinte cheie: analiză modală, turbine eoliene de mică putere cu ax vertical, implementare urbană, diagrama Campbell

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28-2 POWER QUALITY

CALITATEA ENERGIEI ELECTRICE
Power quality problems can cause processes and equipment to malfunction or shut down. And the consequences can range from excessive energy costs to complete work stoppage. Obviously, power quality is critical. There are many ways in which a power feed can be poor quality, and so no single figure can completely quantify the quality of a power feed. In this paper we are going to present all definitions, classifications and problems related to power quality. Finally, we have done comparison between the practical measurements and standards related to power quality.
Keywords: power quality, standards, electrical power system, electric power grids
Cuvinte cheie: calitate de putere, standarde, sisteme de energie electrică, rețele de energie electrică

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28-1 BENEFITS OF INTRODUCING CSR INVESTMENT IN BUSINESS STRATEGY: A STUDY OF PARTNERSHIPS BETWEEN NGOS AND COMPANIES

BENEFICIILE INTRODUCERII RSC ȊN STRATEGIA AFACERII: UN STUDIU AL PARTENERIATELOR DINTRE ONG-URI ŞI FIRME
This paper aims to extend the area of social responsibility by highlighting the importance of partnership between non-profits and social responsibility based companies to attract financing. Three aspects of companies’ wealth are proposed and analysed – the top 100 most important companies in Romania after turnover, which took place in social programs with partnership: the company’s strategy, code of ethics and performance indicators. Continuing the analysis of how CSR could influence the core business of the companies through efficiency and productivity gains.
Keywords: CSR, NGO, partnership, economic performance, sustainability
Cuvinte cheie: CSR, ONG, parteneriat, performanță economică, durabilitate

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27-89 EFECTELE VIBRAŢIILOR ASUPRA ORGANISMULUI UMAN

VIBRATION EFFECTS ON HUMAN BODY
This paper contains a study on the vibration effects the human body. Vibrations may cause more or less serious health effects in humans. It shows to entire human body or exposure to hand-arm system and over them the vibrations caused health disorders.
Keywords: vibration effects syndromes, environment
Cuvinte cheie: vibraţii, efecte, sindroame, mediu

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27-88 CONCEPEREA UNEI BAZE DE DATE ALE ZGOMOTULUI EMIS DE UTILAJE ÎN CONSTRUCȚII CIVILE

NOISE MEASUREMENTS ISSUED ÎN CIVILE CONSTRUCTION SITES DATA BASE
This paper contains considerations about the noise issued în construction sites, measuring the effective noise from the devices and equipment used în construction sites. All the data are organize into a data base that, it is, and should be useful în measuring the level of noise that the workers has to deal with în the construction sites. The data base should help the contractors, architects and workers to respect more effectively the noise risk protection rules
Keywords: noise, database, noise limits, database CPT Torino
Cuvinte cheie: zgomot, baza de date, limite ale nivelului de zgomot, banca de date C.P.T. Torino

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27-87 ANALIZA ZGOMOTELOR ŞI VIBRAŢIILOR PRODUSE DE MIJLOACELE DE TRANSPORT

ANALYSIS NOISES AND VIBRATIONS PRODUCED BY TRANSPORT
This article presents the importance analysis of the noises and the vibrations produced by the buses or trucks and the methods that can reduce them.
Keywords: source of noise, traffic, frequency
Cuvinte cheie: sursa de zgomot, trafic rutier, frecvență

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27-86 MENTENANŢA PREDICTIVĂ ÎN STUDIUL MAŞINILOR DINAMICE ROTATIVE

PREDICTIVE MAINTENANCE IN THE STUDY
OF ROTATIVE DINAMICS MASCHINES
The paper contains theoretical substantiation for machines and equipment troubleshooting, machine bodies in rotational motion. It analyses the dynamic rotary machines, fitted with elastic rotor in rigid bearings without damping, as well as the rotor symmetrically rotational movement with the elastic bearings without depreciation.
Keywords : balancing , maintenance, dynamic rotating machines
Cuvinte cheie: echilibrare, mentenanţă, maşini dinamice rotative

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27-85 STUDIUL IMPEDANŢEI MECANICE A MODELULUI CORESPUNZĂTOR SISTEMULUI UMAN MÂNĂ-BRAŢ

STUDY OF MECHANICAL IMPEDANCE OF THE MODEL CORRESPONDING FOR HAND-ARM HUMAN SYSTEM
The present paper will be a presentation of one possible method of driving mechanical impedance determination. Exposure to harmful vibrations can lead to damages of the structures and health problems or disorders that can appear at the human body. The knowledge of the structures and human body mechanical impedance is essential for realizing appropriate administrative, technical and medical prevention measures.
Keywords: mechanical impedance, vibration, human hand-arm system
Cuvinte cheie: impedanţă mecanică, vibraţii, sistemul uman mână-braţ

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27-84 UNELE ABORDĂRI PRIVIND DETERMINAREA VITEZEI DE DEPLASARE A UNEI RACHETE ÎN SPAŢIUL INTERPLANETAR

SOME APPROACHES CONCERNING THE DETERMINATION OF THE VELOCITY OF A ROCKET INTO INTERPLANETARY SPACE
This paper presents a method of calculation for a fundamental parameter of the missile flight dynamics, movement speed in a fluid medium. It is used in this sense of angular momentum theorem and momentum theorem in fluid mechanics.

Keywords: rocket, reaction force, mass forces, trajectory, mass flow, volume control, non-inertial reference system, exhaust nozzle

Cuvinte cheie: rachetă, forţă de reacţie, forţe masice, traiectorie de zbor, debit masic, volum de control, sistem de referinţă neinerţial, ajutaj de evacuare

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27-83 INFLUENŢA EFECTULUI TERMIC ASUPRA FRECVENŢELOR PROPRII ALE GRINZILOR ÎNCASTRATE LA AMBELE CAPETE

THE EFFECT OF THERMAL LOAND ON THE NATURAL FREQUENCIES OF DOUBLE-CLAMPED BEAMS
The natural frequencies of double-clamped beams are influenced by environmental conditions and operational loads. For instance the temperature induces axial loads due to restraint displacements, which lead after a critical temperature increase to buckling. This paper clarifies the effect of external loads on the natural frequencies of beams.
Keywords: thermal loads, buckling, Euler-Bernoulli beam, natural frequency
Cuvinte cheie: încărcări termice, flambaj, grindă, frecvenţe proprii

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27-82 INFLUENŢA FENOMENELOR DE ECRUISARE ŞI ÎMBĂTRÂNIRE ASUPRA MODULULUI DE ELASTICITATE

THE INFLUENCE OF COLD-HARDENING AND AGING
ON THE COEFFICIENT OF ELASTICITY
Existing industrial steel structures, and especially those we use in the steel industry, for whom the normal operation age is approaching completion, are affected by the phenomena of cold-hardening and aging of steel. Depending on the size tension (unit stress) and the period of running, this paper is intended to adopt a different coefficient of longitudinal elasticity corresponding to components of the resistance structure.
Keywords: hardening, artificial aging, elastic modulus, strength, tension (unit effort)
Cuvinte cheie: ecruisare, îmbătrânire artificială, modul de elasticitate, rezistenţă mecanică, tensiune (efort unitar)

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27-81 CONCLUZII ŞI CONTRIBUŢII PERSONALE LA CONFIRMAREA REZULTATELOR NUMERICE PRIN ANALIZA REZULTATELOR OBŢINUTE EXPERIMENTAL, PENTRU VAGONUL DESCOPERIT CU PEREŢI ÎNALŢI

CONCLUSIONS AND PERSONAL CONTRIBUTIONS
TO THE CONFIRMATION NUMBER OF RESULTS
BY ANALYZING EXPERIMENTAL RESULTS,
WAGON DISCOVER HIGH WALLS
This article aims to confirm the results obtained using the finite element method to simulate the compression on a freight wagon buffers discovered by high walls Comparing the numerical results with experimental results obtained with the method of resistive electric tensometry.
Keywords: cargo wagon, finite elements, stresses, deformations
Cuvinte cheie: vagon de marfă, elemente finite, tensiuni, deformaţii

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27-80 ÎNCERCAREA DE COMPRESIUNE A BILELOR DE RULMENT

THE COMPRESION TEST OF THE BEARING BALLS
The compression test of the bearing balls is not included in the category of classic methods this is regulated by normative like (STAS or ISO). They appear as a necessity where developed and manufactured various kinds of bearings. In this perspective the paper presents the concept of a specialized device for applying a compressive force to the bearing balls of different sizes, and some half-ball.
This makes it possible experimental research of the state of stress and strain that occurs in ball bearing in compression during operation using various methods like: electric resistive strain and/or photo elasticity (fotostress).
Keywords: ball bearing, compression, specialized device
Cuvinte cheie: bilă, rulment, compresiune, dispozitiv specializat

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27-79 CONSIDERAŢII PRIVIND ÎMBUNĂTĂŢIREA TIPULUI DE ÎNCERCARE AL ADEZIVILOR

CONSIDERATIONS ON THE ADHESIVE TESTING
TYPE’S IMPROVEMENT
The authors of the contribution analyse several types of the specimens, involved in the adhesives’ testing protocol. Based on the results of the Finite Element analysis, respectively of the experimental investigations ones, by means of Holographic Interferometry, they suggest a new type of specimen, which assures a more accurate evaluation of the pure shear effect in the adhesive layer. Also, their original testing stand destined to Holographic Interferometry investigations, described in an earlier contribution, can be efficiently involved in this new type of investigation of the adhesives.
The most critical issue consists of the high-accuracy determining of the shear strength of the adhesive layer, without the bending’s additional effect.
The proposed methodology and type of the specimen offer the adequate answer. The author’s further goal consists in involving this new approach in different kind of adhesives’ examination.
Keywords: Adhesive, shear resistance, Holographic Interferometry, specimen, testing stand
Cuvinte cheie: adeziv, rezistenţa la forfecare, Interferometria Holografică, epruvetă, stand pentru teste

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27-78 BATARDOURI METALICE DESTINATE PROTEJĂRI MALURILOR RÂURILOR ÎN CAZ DE DEZASTRE NATURALE

METALIC COFFERDAMS DESIGNED TO PROTECT RIVERBANKS IN CASE OF NATURAL DISASTER
This paper presnts an innovative solution designed to protect riverbanks in case of natural disasters, in order to replace the classics sandbags. The proposed solution is a mild steel construction in the modular system.
Keywords: metallic cofferdams, sandbags, natural disaster, PVC mesh. metal construction
Cuvinte cheie:batardouri metalice, saci de nisip, dezastre naturale, palplanșe PVC, construcții metalice

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27-77 ANALIZA EXPERIMENTALĂ A UNOR PARAPETE DE PROTECŢIE CE ECHIPEAZĂ CĂILE RUTIERE, CA MODELE FUNCŢIONALE Partea a II-a

EXPERIMENTAL ANALYSIS OF SOME
PROTECTION PARAPETS EQUIPPING ROADS,
AS A FUNCTIONAL MODEL – PART II
The objective of this paper is to present the analysis of constructive solutions for protective barriers shock devices that use elastic elements, more efficient than normal operations designed to handle and mitigate some of the energy developed when the shock. These are in the form of concentrated damping systems mounted clamping area of the parapet of the tower.
Keywords: protective parapets, shock absorbers devices, concentrated dampers, elastic elements
Cuvinte cheie: parapete de protecţie, dispozitive amortizoare, amortizoare concentrate, elemente elastice

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27-76 ANALIZA EXPERIMENTALĂ A UNOR PARAPETE DE PROTECŢIE CE ECHIPEAZĂ CĂILE RUTIERE, CA MODELE FUNCŢIONALE Partea I-a

EXPERIMENTAL ANALYSIS OF SOME
PROTECTION PARAPETS EQUIPPING ROADS,
AS A FUNCTIONAL MODEL – PART I
The objective of this paper is to present the analysis of constructive solutions for protective barriers shock devices that use elastic elements, more efficient than normal operations designed to handle and mitigate some of the energy developed when the shock. These are in the form of concentrated damping systems mounted clamping area of the parapet of the tower.
Keywords: protective parapets, shock absorbers devices, concentrated dampers, elastic elements
Cuvinte cheie: parapete de protecţie, dispozitive amortizoare, amortizoare concentrate, elemente elastice

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27-75 STUDIUL DURABILITĂŢII CONDUCTELOR PE BAZA CONCEPTELOR MECANICII RUPERII

THE STUDY OF DURABILITY PIPES BASED ON FRACTURE
MECHANICS CONCEPTS
The paper describes the lifetime analysis of steam pipes subjected to
internal pressure by applying the concepts of Fracture Mechanics of materials.
It also presents the durability analysis of a pipeline with semi-elliptical
longitudinal crack subjected to internal pressure.
Keywords: pipe internal pressure, crack, durability, ego
Cuvinte cheie: conductă, presiune interioară, fisură, durabilitate,exemplu

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27-74 APRECIEREA COMPORTĂRII CONDUCTELOR FISURATE PRIN CRITERIILE MECANICII RUPERII

ASSESSMENT OF CRACKED PIPES BEHAVIOR BY FRACTURE MECHANICS CRITERIA
The paper presents the methods used to assess the behaviour of cracked pipes subjected to internal pressure by applying the Linear Elastic Fracture Mechanics criteria (LEFM). It is also described an analysis of a cracked steam pipe used in Romanian power plants.
Keywords: fracture mechanics, pipe, fracture toughness, heat resistant steel
Cuvinte cheie: mecanica ruperii, conducte, tenacitate la rupere, oţel termorezistent

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27-73 ANALIZĂ CUPLATĂ, FLUENT FLOW – STATIC STRUCTURAL

COUPLED ANALYSIS, FLUENT FLOW – STATIC STRUCTURAL
This paper represents the beginning of research work for two students. It summarizes the steps to achieve a coupled analysis using ANSYS software and also presents the results obtained as a result of the laminar flow of a fluid through a bend 900 polyethylene. This paper represents a beginning of research from two students.
Keywords: coupled analysis, ANSYS, fluid, deformations

Cuvinte cheie: analiză cuplată, ANSYS, fluid, deformații

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27-72 ANALIZA COMPUTAŢIONALĂ A TENSIUNILOR MECANICE ÎNTR-O PIESĂ TURNATĂ DIN ALIAJ PE BAZĂ DE ALUMINIU

COMPUTATION ANALYSIS OF MECHANICAL STRESS
IN A ALUMINUM ALLOY CASTINGS
This paper presents a theoretical mechanism for the formation of mechanical stresses in aluminium alloy castings EN AC-Al Si7Mg0,3 and the computational analysis of residual mechanical stresses in case of cylindrical parts, moulded from a mixture of green sand and of cast iron.
We present a comparison of the values mechanical residual stresses obtained by free and braked shrinkage for this alloy casting.
Keywords: mechanical stress, contraction, aluminium alloy, castings, solidification
Cuvinte cheie: stres mecanic, contracție, aliaj de aluminiu, piese turnate, solidificare

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27-71 CONSIDERAȚII ȘI CALCULE ASUPRA CAZANELOR LOCOMOTIVELOR CU ABUR Partea a II-a

CONSIDERATIONS AND CALCULATIONS ON BOILERS OF STEAM LOCOMOTIVES. PART II

Part II of the paper presents a brief history of rail transport, exposure of the first steam locomotive that circulated in our country and characteristics. In Part II of the paper presents a study and proposals for repair of the boiler of the locomotive. It analyzes the phenomena occurring inside the boiler during operation. The purpose of repairing steam locomotives is to be played recreational circuits in different geographical areas.

Keywords: steam locomotive, boiler, rail, recreation

Cuvinte cheie: locomotivă cu abur, cazan, transport feroviar, agrement

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27-70 CONSIDERAȚII ȘI CALCULE ASUPRA CAZANELOR LOCOMOTIVELOR CU ABUR Partea I-a

CONSIDERATIONS AND CALCULATIONS ON BOILERS OF STEAM LOCOMOTIVES PART I

Part I of the paper presents a brief history of rail transport, exposure of the first steam locomotive that circulated in our country and characteristics. In Part II of the paper presents a study and proposals for repair of the boiler of the locomotive. It analyzes the phenomena occurring inside the boiler during operation. The purpose of repairing steam locomotives is to be played recreational circuits in different geographical areas. Keywords: steam locomotive, boiler, rail, recreation Cuvinte cheie: locomotivă cu abur, cazan, transport feroviar, agrement

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27-69 DETERMINAREA DEFORMAŢIILOR LA O STRUCTURĂ ÎN ARC DE CERC

DETERMINATION OF DEFORMATION
TO A STRUCTURE IN AN CIRCULAR ARC
The paper presents the analysis of displacement to a structure in an circular arc. Displacements of free ends of the structure were analysed in dependence of the position of the anchorage.
Keywords: displacements, deformations, tare
Cuvinte cheie: deplasări, deformaţii, greutate proprie

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27-68 CALCULUL DIAGRAMELOR DE EFORTURI PENTRU GRINZILE DREPTE UTILIZÂND PROGRAMUL MATHCAD

THE COMPUTATION OF SHEAR DIAGRAMS, IN ACTION WITHIN STRAIGHT BEAMS, USING MATHCAD
The paper presents the program CRDEF-GGA-06 created by the author which calculates the reactions axial forces, bending moment respectively shear diagrams for straight static determinate beams.
The program CRDEF-GGA-06 is an application of MathCAD software.
Keywords: reactive, efforts, efforts diagrams
Cuvinte cheie: reacţiuni, eforturi, diagrame de eforturi

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27-67 STUDIUL COMPORTĂRII SUB SARCINĂ STATICĂ ȘI DINAMICĂ A GRINZII PRINCIPALE (profil I) A MACARALEI PORTAL (MACARA CAPRĂ) PARTEA II – STAREA DE DEFORMAȚIE A GRINZII PRINCIPALE ÎN MODUL DE LUCRU ”ANIMAȚIE”

THE STUDY OF THE BEHAVIOR UNDER STATIC AND DINAMIC LOAD OF THE MAIN BEAM (PROFILE „I”) OF A PORTAL CRANE (GANTRY CRANE)
PART II – THE STATE OF DEFORMATION OF THE MAIN BEAM IN THE „ANIMATION” WORKING MANNER
The lifting of the load at a certain height, its stop with a waiting of a 5 s, the descent of the load with a delay of 5 s, the descent of the load with its halt and waiting of approximately 5 s, leads to a certain load of the structure of the portal crane. Therefore one establishes that in the structure of the main beam appear compelled oscillations. In the frequency spectrum of the induced oscillatory motion, the main weight is that of the oscillation whose frequency is equal to the force in the driving cable; one establishes that the Eigen frequencies of the whole structure – the portal crane as a whole, are excited, too. Hence, the approach performed by the authors in the following study: a favourable working of the crane means that the Eigen frequencies of the structure as a whole must be outside the frequency field of the excitation forces, main beam: the state of stress and deformation under static and dynamic load.
Keywords: portal crane, force, structure, animation, frequency
Cuvinte cheie: macara portal, forță, structură, animație, analiză în frecvență

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27-66 STUDIUL COMPORTĂRII SUB SARCINĂ STATICĂ ȘI DINAMICĂ A GRINZII PRINCIPALE (profil I) A MACARALEI PORTAL (MACARA CAPRĂ) PARTEA I – STAREA DE DEFORMAȚIE A GRINZII PRINCIPALE SUB SARCINĂ APLICATĂ STATIC

THE STUDY OF THE BEHAVIOR UNDER STATIC AND DINAMIC LOAD OF THE MAIN BEAM (PROFILE „I”) OF A PORTAL CRANE (GANTRY CRANE)
PART I – THE STATE OF DEFORMATION OF THE MAIN BEAM UNDER STATIC LOAD
Because of the specific nature of the cranes’ activities, these ones have to accomplish a lot of norms concerning the security and labour protection. At the working beginning but also recurrently, the cranes are subjected to a test set in order to check the technical state with a view to the authorization. The verifications are performed by specializes departments and involve the following steps: ▪ the check of the main elements; ▪ tests of loads; ▪ tests under static and dynamic load; ▪ other tests which have in view the whole behavior of the crane.
With a view to the authorization all the tests are compulsory but the present paper presents the analysis of the main beam under the action of external loads. In the current activity one established that the imposed check in order to authorize the cranes are necessary but not enough to ensure those working safety. The present paper makes an important analysis of the main beam: the state of stress and deformation under static and dynamic load.
Keywords: portal crane, force, deflection, acquisition system, transducers
Cuvinte cheie: macara portal, forță, săgeată, sistem de achiziție, traductoare

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27-63 LEONARDO DA VINCI (15.04.1452 – 02.05.1519) INGINERUL ARTIST – GENIU UNIVERSAL Partea I-a

LEONARD DE VINCI (15.04.1452-02.05.1519). L’INGENIEUR ARTISTE – GENIE UNIVERSEL – PART I
L’article présente, d’une manière synthétique, les principales étapes de la vie et de l’activité du génial Léonard de Vinci. Son apprentissage dans l’atelier de Florence du maître Verrocchio a prouvé sa fécondité, car c’est là qu’il a appris les bases de la chimie, de la métallurgie, de la mécanique, ainsi que les techniques artistiques de dessin, de peinture et de sculpture en marbre ou en bronze. Son talent exceptionnel, le travail assidu, sa maîtrise dans de multiples domaines ainsi que la passion de savoir et d’expérimenter l’ont conduit à la réalisation d’œuvres admirables: «l’Annonciation», «L`Adoration des mages», « La Vierge aux rochers », « La Cène », «La Vierge, L`Enfant Jésus avec sainte Anne et saint Jean Baptiste », « La Vierge, L`Enfant Jésus et sainte Anne », « La Joconde », « La bataille d’Anghiari » etc. Tout aussi doué pour les arts que pour la recherche scientifique, l’ingénierie, toutefois passionné par l’étude des phénomènes naturels, expérimentateur, autodidacte, Léonard fait preuve d’une couverture encyclopédique de ses curiosités: anatomie, médicine, géologie, mathématiques, mécanique, résistance des matériaux, astronomie, hydraulique, architecture et fortifications, aviation, machines de guerre, étude des animaux et des plantes, etc. Léonard de Vinci incarne parfaitement l’esprit de la Renaissance à l’époque des «grandes découvertes» – le plus grand génie universel de tous les temps, curieux de tout, vouant toute sa vie à la recherche, au savoir, à l’art, et… à combattre le mal!
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Mots-clés: art, la peinture, „sfumato”, architecture ingénierie, mécanique, résistance des matériaux, de l’anatomie, la médecine, l’eau, l’astronomie, la géologie Cuvinte cheie : artă, pictură, «sfumato», arhitectură, inginerie, mecanică, rezistenţa materialelor, anatomie, medicină, hidraulică, astronomie, geologie

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27-62 CLAUDE NAVIER – 230 DE ANI DE LA NAŞTERE

CLAUDE NAVIER – 230 YEARS SINCE HIS BIRTH
In this paper are presented aspects from the technical, didactical and scientifically activity of the most representative personality of the domain of Strength of Materials which even today constitutes a beacon in the development of this engineering domain. Navier has extremely important contributions to the substantiation of the Theory of Elasticity and the development of the Strength of Materials. By theoretical and practical research Navier established the basis for the calculations for resistance and rigidity of straight or curved bars, statically determinate or statically indeterminate. For plane plates Navier established the differential equation of the median deformed and studied behaviour for vibrations.
Keywords: neutral axis, suspension bridge, strength of materials, tension
Cuvinte cheie: axa neutră, pod suspendat, rezistența materialelor, tensiune

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27-61 CONSIDERAŢII PRIVIND STUDIUL PARAMETRILOR GAZODINAMICI LA DEPLASAREA CORPURILOR CU VITEZE SUPERSONCE ÎN PREZENŢA UNDEI DE ŞOC DETAŞATE

CONSIDERATIONS IN MOVING BODIES GAS DYNAMICS PARAMETERS STUDY WITH PRESENCE IN GEAR SUPERSONCE DETACHED SHOCK WAVE
This paper presents a method to study the parameters of flight in the atmosphere, the bodies’ neaerodinamics at supersonic speeds in the presence of detached shock wave.
Keywords: body neaerodinamic, shockwave, entropy wave resistance, kinetic energy, dash attack, Mach number
Cuvinte cheie: corp neaerodinamic, undă de şoc, entropie, rezistenţă de undă, energie cinetică, bord de atac, numărul Mach

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