Inginerie Mecanică
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 connecting to the moving …
picture_as_pdfText integral (PDF)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 formulas of calculation. Nu…
picture_as_pdfText integral (PDF)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 find an optimum distanc…
picture_as_pdfText integral (PDF)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 processes without\r\nfil…
picture_as_pdfText integral (PDF)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 lathe, type SC 27 – 43 CNC…
picture_as_pdfText integral (PDF)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 movements are coupled. The hunti…
picture_as_pdfText integral (PDF)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 irreversibilities. In most c…
picture_as_pdfText integral (PDF)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 specialised software solution st…
picture_as_pdfText integral (PDF)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 to the mechanical compone…
picture_as_pdfText integral (PDF)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 technique\r\nin the very important a…
picture_as_pdfText integral (PDF)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, with the objective of ev…
picture_as_pdfText integral (PDF)