Now showing items 21-40 of 4206

    • On Activity Modelling in Process Modelling 

      Aiordăchioaie, Dorel ("Dunarea de Jos" University of Galati, 2001)
      The paper is looking to the dynamic feature of the meta-models of the process modelling process, the time. Some principles are considered and discussed as main dimensions of any modelling activity: the compatibility of ...
    • Modelling Non-Stationary Wind Speed for Renewablwe Energy Systems Control 

      Nichita, Cristian; Luca, Daniel; Dakyo, B.; Ceangă, Emil; Cutululis, Nicolaos Antonio ("Dunarea de Jos" University of Galati, 2001)
      This paper deals with the modelling of the wind speed, treated as a nonstationary process. In the proposed modelling methods, the wind speed has two components: a long and medium term-component, described by an available ...
    • On Exponential and Asymptotic Estimation of State Variables in Bioprocesses 

      Selişteanu, Dan; Ionete, Cosmin; Petre, Emil ("Dunarea de Jos" University of Galati, 2001)
      The paper presents on-line estimation strategies for bioprocesses, which are characterized by strongly nonlinear dynamics. A general form for the state observers is analysed and the exponential observability of bioprocesses ...
    • On a Takagi-Sugeno Fuzzy Controller with Non-Homogenous Dynamics 

      Precup, Radu-Emil; Preitl, Ştefan ("Dunarea de Jos" University of Galati, 2001)
      The paper proposes a Takagi-Sugeno fuzzy controller with non-homogenous controller dynamics with respect to the two input channels, that means, in the linear case, different transfer functions with respect to the reference ...
    • Integrating Hypermedia Objects in an Tutoring System 

      Pecheanu, Emilia; Ştefănescu, Diana; Sabin Corneliu, Buraga; Istrate, Adrian ("Dunarea de Jos" University of Galati, 2001)
      The paper describes the internal architecture of an Intelligent Tutoring System, CSTutor. The architectural design of the tutorial system was developed in a collaborative work at the Department of Computer Science of the ...
    • Stability criteria for cellular neural networks 

      Danciu, Daniela; Răsvan, Vladimir ("Dunarea de Jos" University of Galati, 2001)
      A cellular neural network is an artificial neural network which features a multidimensional array of neurons and local interconnections among the cells. Neural networks are systems with several equilibrium states. It is ...
    • Robust Control Methods for a Recycle Bioreactor 

      Ionete, Cosmin; Petre, Emil; Selişteanu, Dan ("Dunarea de Jos" University of Galati, 2001)
      The paper presents a robust control design strategy for bioprocesses, which are characterized by strongly nonlinear dynamics. More precisely, we present the H2 methodology in order to compute the controller for a recycle ...
    • Algorithms for Wireless Channel Equalization with Joint Coding and Soft Decizion Feedback 

      Dobrescu, Radu; Andone, Dana; Dobrescu, Matei ("Dunarea de Jos" University of Galati, 2001)
      The paper proposes a new approach based on Joint Entropy Maximisation (JEM) using a soft decision feedback equalizer (S-DE) to suppress error propagation. In its first section, the paper presents the principle of the ...
    • Supervisory Control Technique for an Assembly Workstation as a Dynamic Discrete Event System 

      Cernega, Daniela Cristina; Mînzu, Viorel ("Dunarea de Jos" University of Galati, 2001)
      This paper proposes a control problem statement in the framework of supervisory control technique for the assembly workstations. A desired behaviour of an assembly workstation is analysed. The behaviour of such a workstation ...
    • Comments on Clock Models in Hybrid Automata and Hybrid Control Systems 

      Oltean, Virginia Ecaterina; Cârstoiu, Dorian ("Dunarea de Jos" University of Galati, 2001)
      Hybrid systems have received a lot of attention in the past decade and a number of different models have been proposed in order to establish mathematical framework that is able to handle both continuous and discrete ...
    • Neural Network Schemes in Cartesian Space Control of Robot Manipulators 

      Boutalis, Yiannis S.; Moise, Adrian; Mertzios, B. G. ("Dunarea de Jos" University of Galati, 2001)
      In this paper we are studying the Cartesian space robot manipulator control problem by using Neural Networks (NN). Although NN compensation for model uncertainties has been traditionally carried out by modifying the joint ...
    • Some Considerations Regarding the Efficiency of the Electromechanical Motion 

      Bivol, Ion; Munteanu, Traian; Lupea, Ionel; Destobbeleer, Eric ("Dunarea de Jos" University of Galati, 2002)
      Control techniques for servo drive which run at variable speed for prolonged time is developed on the base of minimum energy dissipation in a feed-forward structure. The optimal control laws are determinate using the ...
    • Comparison on Sensorless Control of Synchronous Motors 

      Giuclea, Radu; Bogus, Cristian; Kreindler, Liviu (Dunareade Jos University of Galati, 2002)
      The paper compares two different methods for speed and position estimation in AC permanent magnet synchronous motors vector control applications. The first method implies two observer blocks — one for the speed, and the ...
    • Detecting the Liquid core in Continuous Casting Slabs by Load Torque Estimation in Unbending Zone 

      Bivol, Ion; Roşu, Emil; Ceangă, Emil ("Dunarea de Jos" University of Galati, 2002)
      The development in continuous casting process has been strongly dominated by the demands of quality improvement and reduced costs for steel products in recent years. To achieve these goals consideration has been given ...
    • The calculation of Pressure Forces Resultant About Rotor Bearings of Volumetrical Pumps and Motors with Radial Palettes 

      Arghirescu, Cristea L. (Universitatea "Dunărea de Jos" din Galați, 2002)
      The objective of this paper refers to the presentation the calculation of pressure forces resultant about the palettes and the lateral rotor surface of volumic pumps and motors with radial palettes. This calculation is ...
    • The Analysis of the Dynamic Response of the Hydrostatic Driving Systems in a Closed Circuit 

      Gavril, Axinti; Năstac, Silviu; Axinti, Adrian-Sorin; Potârniche, Aurora (Universitatea "Dunărea de Jos" din Galați, 2002)
      The hydrostatic actions in a closed circuit were remarked in the action of the technological equipment both for achievement of translation motions with linear hydrostatic engines with bilateral stem and for rotational ...
    • Influence of Geometrical Parameters on Rigidity of the Worm-Gearing Tooth 

      Ghelase, Daniela; Daschievici, Luiza; Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2002)
      By means of an original numerical method, the authors study the influence of the parameters of the worm-gearing tooth (diametral quotient, radius of profile curvature, profile angle of the worm, number of gear teeth) on ...
    • Mathematical Model for Frequency-Dependent soil Propagation Analysis 

      Cauteș, Gheorghe; Năstac, Silviu (Universitatea "Dunărea de Jos" din Galați, 2002)
      Vibration analyses of advanced technology facilities typically must consider frequency as well as amplitude of vibration. A soil propagation model is proposed which will allow the use of site-specific, measurable, frequency ...
    • Speed and Rotor Flux Estimation in Speed Sensorless Control of Induction Motor 

      Pană, Teodor; Rusu, Călin ("Dunarea de Jos" University of Galati, 2002)
      The paper compares the performances of several adaptive rotor flux and speed estimation methods used in speed sensorless vector control of induction motor. First, a short review of Luenberger, Gopinath, MRAS, Torque Error ...
    • Installation for Centrifugal Casting of Bimetallic Jacks 

      Eftimie, Dorin; Ciurea, Aurel (Universitatea "Dunărea de Jos" din Galați, 2002)
      This issue presents an bronze casting technology of steel jack by centrifuging as well as it’s installation. We try to realize a machine by date theme for mechanization of technological operation. The constructive solution ...