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Inginerie Mecanică
Excelență în Cercetare
Din 1929
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Dynamic analysis of the 3-3 Stewart platform
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ªtefan Staicu
Recursive matrix relations in kinematics and dynamics of the 3-\r\n3 Stewart platform having six prismatic actuators are established in\r\nthis paper. Controlled by six forces, the parallel manipulator\r\nprototype is a spatial six-degrees-of-freedom mechanical system with\r\nsix parallel legs...
On Kármán model for Coanda ejector with incompressible flow
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Corneliu Berbente, Sorin Dinea
Kármán model for Coanda ejector with incompressible regime is\r\nused and completed in order to point out the main parameters that\r\ninfluence the augmentation factor of thrust by ejection and the limits\r\nallowed for the variation of these parameters. To this aim one obtains\r\nanalytical...
Dissipation visqueuse et production d’entropie dans un écoulement établi de convection mixte
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Colette Padet, Emilia-Cerna Mladin, Jacques Padet, Alexandru Dobrovicescu
The present study refers to a fully developed thermal mixed\r\nconvection between two vertical and infinite walls having imposed\r\nconstant temperatures and for a given flow rate (or pressure\r\ngradient). Viscous dissipation and entropy production are\r\nsuccessively estimated and then used to...
Influence of the parameters preheating temperature and linear energy on the micrographic and macrographic characteristics of welded joints
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Corneliu Rontescu, Ionelia Voiculescu, Gabriel Iacobescu, Dumitru-Titi Cicic
The paper presents the experimental results obtained following\r\nthe micrographic and macrographic analyses of the welded joints\r\ncarried out by tungsten inert gas (TIG) welding with respect to\r\ncomponents made of heat-resistant low alloy steel.\r\nThe beads obtained by superficial melting...
Hydraulic system for taking over the clearance for vertical lathe with milling unit
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Dan Prodan, Anca Bucureºteanu, Emilia Bãlan
In this paper there is a short presentation of the systems for\r\ntaking over the returning clearance used in the present, but also a new\r\nsystem. This system is simple and efficient, and allows the building of\r\nsimplified kinematic chains of the machine tools, for example the\r\nvertical...
An analysis of bogie hunting instability
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Traian Mazilu
The hunting movement is specific for railway vehicles and their\r\nmaximal speed is limited due to hunting instability. The paper deals\r\nwith the hunting movement of passenger coach bogie. To this aim, a\r\ncomplex bogie/track model has been considered. The hunting and the\r\nvertical...
Optimization of internal forced convection through a duct based on the second law
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Dorin Stanciu, Alexandru Dobrovicescu
Depending on the heat exchanger solution, the heat transfer in\r\ninternal forced convection can be fulfilled with different wall\r\ntemperature distributions. If the overall rate of the heat flux is\r\nimposed, each of these distributions influences both, flow friction and\r\nheat transfer...
Seismic risk concentrators map based on dynamic structure response
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Horia Gheorghiu, Mihai Dinu, Neculai Roºu
The goal of this paper is to establish an algorithm based on the\r\nuse of a mechanical, dynamic and mathematical model in order to\r\ncreate a map for the seismic risk flow concentrators in a built\r\nstructure. The first step of the algorithm proposed by the authors is\r\nthe use of a...
Dynamical behaviour analysis of three - axis milling centers
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Dan Mihail Marin, Doina Marin, Ramona Cristina Varban
The paper presents the dynamic behavior analysis for a vertical\r\nmachining center during milling process or without load. We have\r\nanalyzed theoretically and experimentally the behavior of the feed\r\ndrives systems and spindle. The experimental research shows\r\ntransmission of vibrations...
Importance of rapid prototyping to product design
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Mihaiela Iliescu, Kamran Tabeshfar, Adelina Ighigeanu, Gabriel Dobrescu
Rapid Prototyping is capable of producing prototypes of almost\r\nany geometrical complexity in relatively short time using the additive\r\nmanufacturing approach.\r\nThis paper describes the advantages and limitations of Z\r\nCorporation Three Dimensional Printing rapid prototyping...
Analyse de la structure et de la topologie des mécanismes compliants planaires
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Stela Ioniþã
This paper describes an original functionality principle and\r\ndesign of compliant mechanisms for industrial robots that are used to\r\nsustain objects that are moved at assembly throughout to a horizontal\r\ndirection. A structural analysis has been performed for these\r\ncompliantmechanisms,...