Benjanarasuth, Taworn

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Benjanarasuth, Taworn
Alternative Name
Benjanarasuth, T.
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Email
taworn.be@kmitl.ac.th

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    Item type:Publication,
    Robust hybrid control for two-dimensional handheld micromanipulator
    (2014-01-01)
    Boksuwan, Sungwan
    ;
    Benjanarasuth, Taworn
    ;
    Kanamori, Chisato
    ;
    Aoyama, Hisayuki
    This paper proposes a two-dimensional handheld mi-cromanipulator oriented toward bio cell handling. The micromanipulator consists of two flexible links, each of which is constructed with a parallel beam structure. Electric coils and permanent magnets are used to produce an actuator to form double drivers. An explicit model predictive control combined with a PID controller called a robust hybrid control is proposed not only to achieve robust tracking performance, but also to dampen the vibration of the mechanism. The experimental results are compared to results from a standard PID controller to investigate the effectiveness of the micromanipulator.
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    Tremor suppression for handheld micromanipulator using robust hybrid control
    (2014-12-16)
    Boksuwan, Sungwan
    ;
    Benjanarasuth, Taworn
    ;
    Kanamori, Chisato
    ;
    Aoyama, Hisayuki
    This paper proposes a suppression of tremor effects, fluctuations caused by a user's hand, on a handheld micromanipulator by means of a robust hybrid control scheme. The proposed control scheme is a combination between an explicit model predictive control and a PID controller. The advantage of the PID controller is a robustness. It is suitable for handling the holding angle changes. The explicit model predictive control provides the excellent tracking performance. In addition, the robust hybrid control can handle tremor effects successfully. The control objective is to achieve robust tracking performance, to dampen the vibration of the mechanism and to suppress a disturbance, a tremor. The experimental results are used to investigate the effectiveness of the proposed method.
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    A heated needle micromanipulator with hybrid control for heat-caused denaturation in proteins
    (2015-08-25)
    Boksuwan, Sungwan
    ;
    Benjanarasuth, Taworn
    ;
    Aoyama, Hisayuki
    The paper proposes a micromanipulator with the heated needle as an end effector in order to transfer heat around a micro area of a sample, egg whites. The proposed micromanipulator is controlled by a combination of an explicit model predictive control and PID controller, so-called the hybrid control, to accomplish tracking performances of several reference paths or shapes of heating the specific area. A tungsten needle wrapped with nichrome wire is used as a heat source mechanism and is connected to the two dimensional micromanipulator. The experimental results reveal that the heated needle can provide high temperature up to 50°C with 10μm needle tip diameter. In addition, the results indicate the effective operations for a point heating and denaturing egg whites in micro scale. Moreover, the heated needle is able to heat along the desired paths (a circle, ellipse, square or triangle) with the error less than 2μm from the center of measurement.