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In this paper the decoupling control of two-inputs two-outputs (TITO) processes using a simplified dynamic decoupler is considered. A frequency-domain identification technique that uses a relay experiment to estimate a first-order plus dead-time (FOPDT) TITO model is presented. The resulting FOPDT TITO model is accurate around at the frequency of interest(More)
In this paper, the auto-tuning of decentralized PID controllers for MIMO processes using different relay feedback experiments is studied. These methods consist in identifying the ultimate point of the process, using relay feedback and applying Ziegler-Nichols-like formulae in order to tune the controllers. A benchmark illustrates the benefits and drawbacks(More)
In this work the identification of first-order plus dead-time models from a relay experiment is considered. The relay excitation is applied to the closed-loop. Alternative techniques for identification are examined and simple algorithms are proposed for dealing with the dead-time. Simulation examples are used to illustrate the techniques.
— In this paper a procedure to evaluate and redesign simplified dynamic decouplers using relay-based experiment is applied to a TITO laboratory-scale thermal process. This procedures was originally proposed in (Acioli Júnior and Barros, 2011). The aim of the procedure is to reach effective decoupling at frequencies of interest for control purposes. Resumo—(More)
In this paper a methodology is presented to assess the performance of PI controllers from closed-loop response data for pulse setpoint signal. Here a previously published technique is extended to evaluate and redesign single-input single-output (SISO) control loops for single and double pulses. The paper describes a system identification procedure for(More)
Second-Order plus Time-Delay (SOPTD) models are commonly used to approximate systems in order to tune PID controllers. Simple models are dominating for control design in industrial applications. Several estimation techniques have been developed and applied to controller design. Most estimation techniques are based on least-squares and excitations such as(More)
— In this paper a proposal for redesign PI controllers with Symmetrical Optimum (SO) based design is presented. The method, introduced by the authors and called Modified Symmetrical Optimum (MSO), uses an integration plus first-order model, identified from two frequency points obtained from combined relay experiment. The proposal for the identification of(More)
In this paper it is presented a procedure for closed loop controller redesign using a relay based experiment. The present closed loop is evaluated in relation to a symmetrical optimum design. The loop gain is estimated at a few frequency points using an excitation derived from a relay experiment. The controller is redesigned to yield some stability margin(More)
In this work an approach to analyze non-deterministic execution plans for flexible manufacturing systems is presented. This approach consists of modeling the system using coloured Petri nets and then, by simulation, discover the possible executions for the system. After, model checking is used to prove that the model behavior do not deviate from the(More)