Arhivă — Seria D

1

KINEMATICS OF THE HEXAPOD PARALLEL ROBOT

Rosario SINATRA, Fengfeng XI, Stefan STAICU

Recursive modelling for the kinematics of the Hexapod parallel robot are established in this paper. Controlled by six forces, the parallel manipulator prototype is a space six-degrees-of-freedom mechanical system with six fixed-length legs connecting to the moving platform. Knowing the position and the general motion o…

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2

OPTIMIZATION OF CONVENTIONAL IRREVERSIBLE CASCADE REFRIGERATION SYSTEMS

Horaþiu POP, Michel FEIDT, Gheorghe POPESCU, Valentin APOSTOL, Cristian Gabriel ALIONTE

This paper proposes a mathematical model devoted to the optimization of conventional double cascade refrigeration systems. The optimization involves finding the optimum operation regime corresponding to a maximum coefficient of performance COP. The thermodynamic cycles belonging to the top and bottom cascades, respecti…

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3

HIGHER EFFICIENCY TARGETING IN A STEAM POWER PLANT BY USING PINCH TECHNOLOGY

Fazlollah ESKANDARI, Masoud BEHZAD

While energy productive sources continue to decrease, energy conservation remains the prime concern for many process industries. For the purpose of energy savings, the methods of analysis, synthesis and optimization are becoming more important. In this paper a computer program, which is related to a pinch technology ap…

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4

OPTIMIZATION APPROACH TO CONCEPTION OF A MECHANICAL PART USING CAD/FEM TECHNIQUES

Ionuþ Gabriel GHIONEA

The paper presents a practical application methodology in FE analysis for the optimization of the mechanical parts’ conception and design. The working procedure uses the CATIA CAD-FEM environment, a 3D model, a loading force, restraints and some optimization techniques. The necessary calculations for the analyzed part …

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5

NUMERICAL STUDY OF A WIND TURBINE WITH CROSS-FLOW RUNNER

Andrei DRAGOMIRESCU

Most of the classical wind turbines are not able to start at wind speeds as low as 2-3 m/s. Other turbines, like Savonius, have a low maximum efficiency, rendering them useless in poor wind conditions. Therefore, new turbine designs are required to harvest wind power even when the wind speed is low. A wind turbine hav…

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6

ANALYSE EXERGETIQUE POUR LE CHOIX DE LA DIFFERENCE DE TEMPERATURE OPTIMALE DANS LES ECHANGEURS DE CHALEUR RECUPERATEURS D’UN SYSTEME CRYOGENIQUE

Alexandru DOBROVICESCU, Dorin STANCIU, Colette PADET,

The paper shows that the minimization of the exergy destruction in a recuperative heat exchanger of a cryogenic system is performed when the temperature difference between the two gas streams is proportional to the temperature level at which the apparatus operates. The reducing in the temperature difference towards the…

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7

INFLUENCE OF PINCH AND APPROACH POINT ON CONSTRUCTION OF A HEAT RECOVERY STEAM GENERATOR IN A COMBINED CYCLE

Constantin NEAGA,Laurenþiu FLOAREA

The present paper is created as a detailed continuation of the analysis described in paper [1]. In the mentioned article, the combined cycle was thermodynamically analysed,emphasizing material debits which flow through recuperative thermoelectric power plant and their temperatures at various regions of the circuit. The…

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8

A WEAR MODEL OF CUTTER TOOTH ON BRITTLE MATERIAL

Andrei TUDOR, Monica VLASE

The wear of a cutting tooth from building machine is the most important parameter, which defines the excavator or pickier tool durability.\r\nThe mechanical properties of the ferro-concrete and the stone material and the geometry of the cutter tooth define the pressure distribution on the contact surface and the workin…

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9

KNOWLEDGE MANAGEMENT SOLUTIONS FOR PRODUCTS DEVELOPMENT IN THE ENTERPRISE BUSINESS INTELLIGENCE

Sebastian Marius ROªU, Marius GURAN, George DRÃGOI

In this paper the knowledge management and business intelligent concepts will be defined in order to analyze enterprise internal and external resources based on the knowledge transfer & capitalization. The main goal of the paper is to propose some knowledge management solutions to support knowledge applications develop…

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10

MSW BIO-DRYING: AN ALTERNATIVE WAY FOR ENERGY RECOVERY OPTIMIZATION AND LANDFILLING MINIMIZATION

Elena Cristina RADA, Marco RAGAZZI, Valeriu PANAITESCU

In the management of Municipal Solid Waste (MSW), in agreement with the new European directives concerning the materials valorization and energy recovery, a recent approach is based on a one-stream Biological Mechanical Treatment (BMT). \r\nThe bio-mechanical treatment of MSW is an increasing option either as a pre-tre…

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11

METHOD OF CALCULUS FOR THE POWER INPUT OF THE HELICAL SCREW COMPRESSOR

Dan Codruþ PETRILEAN

The paper proposes a method for power absorption determination of the helical screw compressor. The classic method is known, but at the graphical-analytical method, the graphical procedure is followed by a mathematical model of the gas flow in the compressor. The obtained results are applied for validation of the insta…

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12

VIRTUAL DESIGN OF A MACHINE TOOL FEED DRIVE SYSTEM

Radu Constantin PARPALA

Today, machine tool manufacturers can no longer afford to consume time and money building and testing real prototypes of the machine tool model, instead they use virtual prototypes. This paper presents the current state of virtual prototyping of a virtual machine tool; the work focuses on the design of the feed drive s…

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13

EXTENSIVE AREA TO APPLY THE VALUE OF ENGINEERING (II)

Ion IONIÞÃ, Liliana MOGA

In this paper we will present a case study through which we intend to demonstrate the feasibility of the proposed methodology and its use effectiveness in designing/redesigning information systems of enterprises. The case study is focused on a company included in the SME category specialized in trading activities. Actu…

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14

MANAGING CHANGE THROUGH COMMUNICATION

Corina Oana GEORGESCU, Corneliu V. RADU, Radu D. STANCIU

It is not the strongest of the species that survive, nor the most intelligent, but the ones most responsive to change.\r\nCharles Darwin\r\nThe present paper is meant to emphasize the way in which communication has contributed to an increased effectiveness of a major change process, which took place in the Romanian bra…

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15

ADAPTIVE HUMAN RESOURCES SELECTION TOOLS IN VIRTUAL INDUSTRIAL ENTERPRISE ENVIRONMENT

Gabriela Beatrice NICA, Traian AURITE

In order to successfully participate in a virtual team, human resources must be able not only to develop specific technical capacities but also to possess abilities in involving themselves in virtual industrial environment based projects. Present psychological inventory (CPI and MBTI) used to evaluate those capabilitie…

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16

THE FUNCTIONAL ALGORITHM OF VENTILATION SYSTEMS FOR EVACUATING THE SMOKE AND HOT GASES OUT OF A MULTISTOREY BUILDING ON FIRE

Oleg SUSAN, Constantin ÞULEANU, Valeriu PANAITESCU

This works offers an algorithm for smoke evacuation out of a multi-storey building inside which it is supposed that the necessary time for people evacuation can be longer than an usually accepted one. The purpose is to avoid a serious smoke contamination of the staircase and of the other floors and also to maintain the…

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17

POLLUTION HYDRAULIC FLUIDS ANALYSIS BY THE DIFFERENTIAL PRESSURE FILTERS EVOLUTION

E. BOUZAOUIT, Aouel HADJADJ, M. GAHGAH, O. BENNIS

This work aims at characterizing the behavior of the hydraulic filters used to reduce the polluting particles contained in the hydraulic systems working to high pressure, live with aim at the pollution of the fluid employed. By analyzing the cause of the hydraulic installations breakdowns, one notes that they are cause…

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18

CONTRIBUTIONS TO FLUID DYNAMICS IN JETMILLS BY A NEW AERODYNAMIC MODEL OF SUPERSONIC FLOW

Ileana FULGA, Eugen STRÃJESCU

A new aerodynamic model of the grinding jet is proposed for further studies and evaluations, considering the mathematical complexity of fluid mechanics, where quite few cases are being solved by numerical methods, typically with special algorithms and clusters of many computers. This material presents a citical analysi…

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19

SUR LES DEFORMATIONS ELASTIQUES DE QUELQUE CONSTRUCTIONS DES OUTILS DE TOURNAGE PAR LA METHODE D’ELEMENT FINI

Ioan POPESCU, Ioana Mãdãlina MIRSANU

This paper presents a study, concerning the Finite Element Method, over the static elastic strains of new turning tools constructive solutions relating with standing classical turning tools. The new tool constructive solutions – the flexible turning tools and fitting holders represent the object to a patent, which it w…

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