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SERIA D
Inginerie Mecanică
Excelență în Cercetare
Din 1929
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DYNAMICS OF THE ORTHOGLIDE PARALLEL ROBOT
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Damien CHABLAT, Philippe WENGER, Stefan STAICU
Recursive matrix relations for kinematics and dynamics of the Orthoglide parallel robot having three concurrent prismatic actuators are established in this paper. These are arranged according to the Cartesian coordinate system with fixed orientation, which means that the actuating directions are...
A DEVELOPING A MATHEMATICAL MODEL
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Tudor CÃSÃNDROIU, Mihai POPESCU, Gheorghe VOICU
In this paper, a mathematical model of separation of the seeds on plane sieves is developed by using for the first time the theory of the dimensional analysis. This model allows anticipating the coefficient of separation of the “small seeds”, which evaluates the efficiency of the...
THE VARIATION OF THE CHARACTERISTICS OF THE IDEAL GAS FLOWS AS A FUNCTION OF MACH NUMBER CONSIDERING TEMPERATURE GAS PROPERTIES VARIATION
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Dan RACOÃI, Corneliu BERBENTE
The temperature, pressure and density variation with the March number is described by the gas dynamical functions. These functions are usually deduced from the hypotheses of the constant adiabatical exponent. A systematic method is described, based on the energy conservation equation and the...
RESEARCHES REGARDING QUALITY OF THE WELDED JOINTS OBTAINED BY APPLYING THE TECHNIQUES OF WELDING RENEWAL TO COMPONENTS FROM THE ENERGY INDUSTRY MADE F
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Dumitru - Titi CICIC, Gheorghe SOLOMON, Gabriel IACOBESCU, Corneliu RONTESCU
The main techniques of renewal by welding applicable to energy equipments components are presented in this paper, as well as their limitations, the experimental program, the obtained results and the main effects they have compared to the classical variant of renewal by welding followed by post...
FATIGUE LIFE PREDICTION OF A CRACKED LAP SPLICE SPECIMEN USING FRACTURE MECHANICS PARAMETERS
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Pedro M.G.P. Moreira, Paulo F.P. de Matos, ªtefan D. Pastramã, Pedro P. Camanho, Paulo M.S.T. de Castro
One of the main problems of aeronautical structures is the onset and growth of damage due to fatigue loading. This phenomenon is accentuated in areas of stress concentration, for example in the connection of components, such as the riveted joints of fuselage panels. This paper is focused on the...
THE ACOUSTIC MULTI-CHAMBER MUFFLER PERFORMANCES
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Ovidiu VASILE, Nicolae ENESCU
This paper investigates the acoustic performance of a reactive silencer (muffler) for three special cases using numerical and experimental techniques. The plane waves based models such as the transfer matrix method (TMM) can offer fast initial prototype solutions for silencer designers. In this...
WHEEL/RAIL FRICTION POWER IN CURVED TRACK
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Andrei TUDOR, Nicolae SANDU Elias TOUNTAS
The paper analyses the longitudinal, lateral and spine creepages and the friction power for the wheel-rail contact on curved track. The geometry of UIC49 rail and S78 wheel and their contact are shown as an exemple. The contact area can be of elliptic or rectangular form, as a function to the...
MATHEMATICAL MODELING AND NUMERICAL SIMULATION OF PROCESSES INSIDE A TURBO-ENGINE THAT USES LANDFILL GAS
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Valentin SILIVESTRU, Romulus PETCU, Valeriu VILAG, Corina MANDIS, Dan ROBESCU
In Romania, the landfill gas, obtained through fermentation of organic matter contained in waste materials, is burned without an energetic utilization. This fact imposes the adoption of solutions for the energetic capitalization of these gases. On the other hand it is known that the engines used...
OPTIMAL DESIGN FOR THE INTERIOR SHAPE OF A ANNULAR DIFFUSER WITH DIVERGENT CAREENING CONSIDERING THE MINIMUM WHOLE LOSS PRESSURE
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Mihai D.L. ÃÃLU, ªtefan D.L. ÃÃLU
In this paper is presented a new mathematical model and a numerical programme in Mapple 11 programming language, for optimum design of the interior shape of a hydraulic annular diffuser with interior divergent careening.\r\nThe mathematical model was determined to respect the minimum values of...
MANAGEMENT VALUATION AS AN INTANGIBLE ASSET
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Dragoº Mihai IPATE, Iuliana PÃRVU
Knowledge is the main source of value and competitive advantage in the new economy. Due to the impact of the intangible assets upon the performance of organizations, their managers need adequate models which can help them evaluate the efficiency of investing in non-corporeal assets because the...
FOREX AND THE LIBERALIZED FINANCIAL MARKET
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Oana DAVID, Beatrice LEUSTEAN
The present paper is trying to introduce the meaning, method and mechanism of Forex market, as well as the participant’s risks and opportunities in this sort of transactions. The authors also briefly present the role of the continuously liberalizing financial market into the environment of...
TECHNOLOGICAL DIFFERENTIATION AND PERFORMANCE MEASUREMENT ON SUPPLIER INTEGRATION IN NEW PRODUCT DEVELOPMENT
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Gheorghe MILITARU
This paper summarizes what the academic literature has to say about the integration of suppliers in new product development and contributes with an empirical research to demonstrate that technological differentiation, business performance, the innovation and the communication between company and...
THE TIME AS A RESOURCE
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Corina – Ionela DUMITRESCU, Sorin IONESCU
We propose in this paper an approach of time as an important resource that generates competitive advantages for a company. There are also important aspects reviewed of the time management because, from our point of view, these aspects are decisive for the understanding of the role of time in...
EXTENSIVE AREA TO APPLY THE VALUE OF ENGINEERING (I)
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Ion IONIÃÃ, Liliana MOGA
While the Value Engineering is presently applied in this country, as well as worldwide, mainly in the design/redesigning of products, especially to those of industrial type, the research that we have undertaken in the recent years has provided us to develop new methodologies for expanding the...