Isarakorn, Don

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Isarakorn, Don
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Isarakorn, D.
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don.is@kmitl.ac.th

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    Item type:Publication,
    Phase-locked loop process control system using LQR approach
    (2004-01-01)
    Wanchana, S.
    ;
    Benjanarasuth, T.
    ;
    Isarakorn, D.
    ;
    Ngamwiwit, J.
    ;
    Komine, N.
    This paper presents the phase-locked loop (PLL) process control system designed by using the approach of linear quadratic regulator (LQR). By considering the loop filter (LF) of phase-locked loop is a part of the process to be controlled, an augmented system can be constructed when voltage control oscillators (VCO) is considered as an added integrator. The integral gain of the proposed augmented system obtained by LQR can be used as an optimal value to design the parameter of LF under the known value of natural frequency of the PLL. The experimental results in controlling the second-order lag pressure process using the proposed PLL show that the system response is fast without overshoot and steady-state error, the output disturbance effect can be rejected, the property of tracking can be obtained and the system can be controlled when process parameter is changed. © 2004 IEEE.
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    Application of coefficient diagram method for rotational inverted pendulum control
    (2004-01-01)
    Cahyadi, A. I.
    ;
    Isarakorn, D.
    ;
    Benjanarasuth, T.
    ;
    Ngamwiwit, J.
    ;
    Komine, N.
    In this paper, a design of the augmented state feedback controller by using the concept of Coefficient Diagram Method (CDM) for a servo type of the rotational inverted pendulum system is presented. An Integrator is augmented to the system due to the responses exhibiting steady-state error. In order to apply the CDM method, the augmented system must be firstly linearized and converted into controllable canonical form by a transform matrix. Then a feedback gain matrix in sense of CDM can be obtained. One can observe that the design procedure of the proposed controller is easy compared to other methods. The experimental results are shown in order to verify the effectiveness of the controller. © 2004 IEEE.