Artigo de evento

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Navegando Artigo de evento por Autor "Fabrizio Leonardi"

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    Artigo de evento
    Design of a hydraulic turbine control system by numerical optimization
    (2015-09-21) CANONICO, R.; Renato Aguiar; Fabrizio Leonardi
    © 2015 Dime universita di genova, dimeg university of calabria. All rights reserved.This work proposes the use of numerical optimization based on Direct Transcription as a method for the design of the control system for hydroelectric turbines. The control design for this application involves constraints but the usual control techniques do not allow explicitly to incorporate constraints in its formulation or are very sensitive to initial estimates of the optimization problem implying in convergence issues. The Direct Transcription is an alternative optimization-based design where the dynamics are discretized and included as constraints of the optimization problem causing the errors due to the quality of the initial estimate to be diluted over the discretization nodes. The constraints considered are related to the actuator and other operating limits during a change maneuver of operating point.
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    Artigo de evento
    Incremental root locus and pid tuning
    (2006-10-04) GOMES, S. C. P.; Fabrizio Leonardi; DA CRUZ, J. J.
    This work discusses the Incremental Root Locus property and one application of it to PID controllers tuning. It is shown that using that property it is easy do determine the departure angle from the real axis, which is a not a trivial task using the classical root locus rules. As an application, a procedure for tuning PID controllers in two steps is shown. Firstly it is necessary to perform a step response test using a proportional controller in order to stabilize the system. In a second step the PID design is performed by a zero-pole canceling. The controller obtained is a two-degree-of-freedom PID controller. Simulations carried out indicate that the controller associated with the setpoint tracking exhibits an almost first-order response whereas the one associated with the disturbance rejection exhibits a more oscillatory response. As illustrations, a real application for a position servo control system and some design projects tested by simulation were done.
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    Artigo de evento
    Integrated manufacturing laboratory and software tools applied to an industrial engineering undergraduate course
    (2009-03-23) Fabio Lima; PRADO, A. C.; Alexandre Augusto Massote; Fabrizio Leonardi
    This paper describes the experience of using software tools associated with an integrated manufacturing laboratory in an industrial engineering undergraduate course at FEI (Fundacao Educacional Inaciana, Brazil). The integrated manufacturing laboratory has got three complete manufacturing cells integrated by computer. The aim of the laboratory is to provide to the industrial engineering student a powerful analysis capability of how to use these kinds of systems to improve product quality and production performance. To do that, computational models are implemented using software tools like Visual Object Net++, Promodel® and WEB support. Finally, the models are validated in laboratory experiments. It was observed that such strategy has been given excellent learning results.
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    Artigo
    Using linear programming for the optimal control of a cartpendulum system
    (2011-01-05) PUGLIA, L. V.; Fabrizio Leonardi; Marko Ackermann
    This paper discusses the use of linear programming for the optimal control of a cart pendulum system. The objective function and the constraints are designed to minimize the control effort and the time duration of the operation. Simulations and experimental tests were performed. Restrictions of null angle and angular velocity at the extremes were incorporated in the design specification as well as other physical constraints. In order to compensate for the modeling errors and disturbances, the optimal trajectory was kept within a prescribed precision by means of a closed loop system. The obtained results illustrate that the technique is simple, powerful and always conclusive.
  • Nenhuma Miniatura disponível
    Artigo de evento
    Using linear programming for the optimal control of a cartpendulum system
    (2011) PUGLIA, L. V.; Fabrizio Leonardi; Marko Ackermann
    This paper discusses the use of linear programming for the optimal control of a cart pendulum system. The objective function and the constraints are designed to minimize the control effort and the time duration of the operation. Simulations and experimental tests were performed. Restrictions of null angle and angular velocity at the extremes were incorporated in the design specification as well as other physical constraints. In order to compensate for the modeling errors and disturbances, the optimal trajectory was kept within a prescribed precision by means of a closed loop system. The obtained results illustrate that the technique is simple, powerful and always conclusive.