Acta Technica Corviniensis

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ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERING3. AMALIA ANA DASCĂLSTUDY ON THE VARIATION OF CONVENTIONAL FLOW LIMIT DEPENDING ON THEMAIN ALLOY ELEMENTS FOR THERMORESISTANT STEELAbstract:The paper presents the results of the research made under laboratory experimentaltesting, on OLT45K steel, intended to the manufacturing of tubes, used at hightemperature in the make-up of thermal-energetic installation. Mechanical driving testinghas been made at the temperature of 450°C, on shares of test-bars drawn out of anumber of 50 charges, with a view to achieving the optimization of the chemicalcomposition of this steel type. The optimization, under experimental dates, suggestsalternatives of combinations among the main elements of the chemical composition, soas the steel can be elaborated with superior mechanical features at high temperature.The obtained results have a large feasibility area, and can be also endorsed for othersteel types and mechanical features for which the optimization is viewed, thereforebeing very useful to technologists, in the process of achieving a certain type of steel.4. EUGEN GHITA, LUCIA VILCEANU, RAMON BALOGH, MONICA DOBRAAN EXPERIMENTAL ANALYSIS ABOUT THE FRACTURE OF THE WHEELSET-AXLESOF THE 5100 KW ELECTRIC LOCOMOTIVEAbstract:The paper is focused on some experimental analysis performed in the Testing MaterialsLaboratory belonging to I.C.M. Resita regarding the appearance of cracks in thewheelset-axles of the 5100 kW electric locomotives. Chemical, traction, bendingdynamic and torsion tests are performed for different wheelset-axles, different rollingdistances and different working conditions which for the “stick-slip” phenomenonoccurred.5. REMUS BOBOESCU, ION SPOREA, ILARIE BORDEAŞU,ADRIANA TOKAR, VICTOR BUJORTHE USAGE OF TYPE SILIUMINIU ALLOYS WITH MAGNESIUM FOR CASTINGA VERY LARGE USED PIECESAbstract:ATSi7Mg aluminum alloy is subjected to the processes of hardening and aging. Thestructural transformations are related mechanical properties of the alloy. The prezenceof the Mg2Si phase is the main cause of increasing resistance of alloys Al-Si-Mg, but withthe presence of stable phase Mg 2 Si reduces refractivity of ternary alloys.6. SORIN RATIU, ŞTEFAN MAKSAY, ANA JOSANREGISTRATION AND PROCESSING OF FUNCTIONAL PARAMETERS VALUES FORINTERNAL COMBUSTION ENGINES 45Abstract:The article represents a study regarding the creation of a correlation between thefunctional parameters of the internal combustion engines, both diesel and petrol ones,with the help of the MATLAB mathematic software. The values of these parameters wereregistered with the help of the mega macs 55 equipment, in real time, the motor vehiclesrunning in urban traffic.7. ANCA IORDAN, MANUELA PĂNOIUDESIGN OF SEQUENCE DIAGRAMS FOR IMPLEMENTATION OF A DYNAMICALSOFTWARE FOR DOING GEOMETRICAL CONSTRUCTIONS 49Abstract:This paper presents a software package, which can be used as educational software. Theinformatics system, including modern methods and techniques, will lead the subject313741102008/ACTA TECHNICA CORVINIENSIS/Tome I
ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERINGwhich is using it to gain experience in understanding and managing the knowledge fromgeometry field and will offer the comfortable and efficient access to the newestinformation and knowledge. The investigation can be oriented towards reaching ofsome precise purposes or can be an exploration.8. GELU OVIDIU TIRIAN, STELA RUSU-ANGHEL, CAMELIA PINCA-BRETOTEANPREDICTION OF THE SIGNALS USING THE NEURONAL NETWORKS 53Abstract:This paper work refers to the prediction problems which are used with the help of theneuronal networks. The network is made of a neuron whose function is linear and whohas the past few 5 input values of the useful signal x(t) – this signal must be predicted.The training algorithm is Widrow-Hoff. This algorithm decreases the number of squareerrors between the output of the network and the required value, and it eventuallyestablishes the “weight” factor.9. VASILE ALEXA, CONSTANTIN GRIGOREMANAGING PRODUCTION ACTIVITIES USING THE BALANCED SCORECARDSTRATEGIC MANAGEMENT SYSTEMAbstract:The use of an adequate management method can ensure organizational success. If untilnow the focus was on the financial success of organizations, now more and moreimportant are the customers, employees, collaborators. The Balanced Scorecard (BSC) isa strategic management system that manages the company’s activities depending on itsvision and strategies. Within the management instrument, the Balanced Scorecardanalyses the four perspectives: the customers, learning-development, internal processesand the financial field.The Balanced Scorecard looks at a business strategy from all perspectives and allows thedivision of the strategic objectives in individual objectives and actions down to the lastoperational level. The BSC can contain both quantitative and qualitative objectives.For the present-day organizations information is no longer the basic component.Because the organizations administer a too big volume of data and information, themanner in which the relevant information is selected and used within the organizationalactions and in decision-taking is of extreme importance. The ecosystem that underlies aBalanced Scorecard is made up of visions, missions, organizational values andcompetences, strategies.The work deals with the way in which organizations should choose the BSC solutionwhich meets the company’s requirements best so as to fulfill its individual needs.10. VERONICA ARGESANU, MIHAELA JULA, IOAN LAZATHERMO ELASTIC INSTABILITY WITHIN A CLASS IV FRICITON JOINT 65Abstract:With a class IV couple of friction joint there are conditions when the disturbances of thepressures on the interface increase, decrease or remain unchanged. When the twomaterials of the joint are identical a relative stability is formed regarding thisphenomenon, while a good heat-conducting material coupled with a heat insulator,depending on certain characteristics of sliding speed, creates instability.Materials of the same type making the joint tend to a relative stability when speaking ofthis phenomenon, while a joint composed of a good heat conductor material and ainsulator will always show characteristics of relative sliding speed, from which instabilityappears.Equation of this paper specifies the threshold for instability. The equations serve toprovide the terms depending on which the pressure disturbance in a frontal sealinginterface increases. In this case load concentrations occur in small portions of thecontact surfaces, resulting in damage or separation of the rings.572008/ACTA TECHNICA CORVINIENSIS/Tome I 11
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