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    Design of PI controller using decoupling and CRA techniques for quadruple-tanks process
    (2011-12-01)
    Numsomran, Arjin
    ;
    Suksri, Tianchai
    ;
    Tipsuwanporn, Vittaya
    ;
    Trisuwannawat, Thanit
    ;
    Tirasesth, Kitti
    This paper presents the design of PI controller using Decoupling and CRA technique for quadruple-tanks process. In case of, TITO interacting system such as quadruple-tanks process, the controller designs have been performed ambitiously because interferences between inputs and outputs. With the proposed method, The Decoupling controllers have been used for decreasing the cross coupling between inputs and outputs and transforming TITO plant transfer function into SISO form so that SISO controller for each SISO model can be designed easily and efficiently. Furthermore, Using CRA technique has made the output response achieve the required performance specification. Also, in non-minimum-phase, PI controller with inverted Decoupling can stabilize the system and minimize several undesirable influences from an interaction in TITO process. The results from control system design can be illustrated by the experiments. © 2011 ICROS.
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    Design of decoupled controller for TITO system using characteristic ratio assignment
    (2007-12-01)
    Numsomran, Arjin
    ;
    Wongkhum, Theerachai
    ;
    Suksri, Tianchai
    ;
    Nilas, Phongchai
    ;
    Chaoraingern, Jutarut
    Most control performances in actual design are usually defined by the time domain response such as overshoot, rising time, settling time, steady state error, etc.. There are few control design methods, which are able to apply directly to the purpose. The pole placement method is the most popular. The Characteristic Ratio Assignment (CRA) is one technique of pole placement based on defined parameter of characteristic equation. This technique cans adjustment of speed response and the damping ratios by only one parameter. In this paper, CRA is use to design controller for two-input two-output (TITO) systems. By using the decentralized CRA controllers and eliminate interaction between loop transfer function with conventional decoupler design method. Several examples are present to illustrate the effectiveness of the proposed method and compared it with existing ones. It is show that CRA design is stable, robust, whilst giving the desired time domain performance. © ICROS.