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Author: search.filters.author.Komine, NoriyukiSubject: search.filters.subject.Coefficient diagram method (CDM)

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    Hybrid controller for swinging up and stabilizing the inverted pendulum on cart
    (2008-12-01)
    Asa, Ekachai
    ;
    Benjanarasuth, Taworn
    ;
    Ngamwiwit, Jongkol
    ;
    Komine, Noriyuki
    In this paper, a hybrid controller for swinging up and stabilizing an inverted pendulum on cart is presented. The energy control concept is employed to swing the inverted pendulum up to around the upright position within the assigned switching condition. After that, the stabilizing controller is then switched to stabilize the inverted pendulum at the upright position. The stabilizing controller is a linear servo state feedback controller designed by Coefficient Diagram Method. The simulation results show that the designed hybrid controller can be mutually operated with acceptable efficiency.
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    New tuning formulas for two-degree of freedom PID controllers and the application to level control systems
    (2007-01-01)
    Benjanarasuth, Taworn
    ;
    Ngamwiwit, Jongkol
    ;
    Komine, Noriyuki
    ;
    Ochiai, Yasuzumi
    This paper presents novel tuning formulas for two-degree of freedom PID-family controllers. The structure of the proposed control system consists of a plant or process to be controlled, P or PI or PID controllers and a pre-filter. The tuning formulas are derived based on the CDM design method by solving CDM algebraic equations obtained from the known controllers' structures and the approximated plant model based on the experimental test. The proposed formulas are summarized in the tuning table and can be used easily. To apply the tuning rules, the plant or process is firstly tested to find the values of critical gain and critical period experimentally in the same manner as Ziegler-Nichols' second method. The parameters of P, PI or PID controller and the associated pre-filter are then obtained by substituting those values in the formulas. The experiments in controlling the level process with long pipeline controlled by the controllers tuned by the proposed rules and the well-known Ziegler-Nichols' formulas are conducted and compared. The proposed control systems result in responses with shorter settling time and considerably smaller or no overshoot. Overall, the proposed formulas are well applicable despite their simplicity.