KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Access type: UnknownAuthor: search.filters.author.Asa, Ekachai

Search Results

Now showing 1 - 5 of 5
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    0.5-V Mixed-Mode Universal Active Filter Using Multiple-Input OTAs
    (2024-01-01)
    Phatsornsiri, Punnavich
    ;
    Kumngern, Montree
    ;
    Nonthaputha, Thanat
    ;
    Asa, Ekachai
    ;
    Singsathien, Jateslid
    This study introduces new 0.5 V, ultra-low power mixed-mode universal analog filter applying multiple-input operational transconductance amplifiers (MI-OTAs). The filter configuration based on MI-OTAs and two grounded capacitors to actualize a mixed-mode universal filter that can produce four modes second-order filters, that is low-pass, high-pass, band-pass, band-stop and all-pass filters, namely voltage-mode, current-mode, transimpedance mode, transconductance-mode, by appropriate selecting input signals. The filter's natural frequency can be electronically controlled. The mixed-mode filter was analyzed using CMOS 0.18μm process simulation from TSMC, operating with a 0.5 V power supply.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Aircraft Altitude Control Based on CDM
    (2019-05-09)
    Asa, Ekachai
    ;
    Yamamoto, Yoshio
    ;
    Benjanarasuth, Taworn
    This research presents the controller design for aircraft altitude control based on Coefficient Diagram Method (CDM). The controller, which is designed by CDM, guarantees a good balance of stability, response and robustness. The simulation results of the proposed control system show that the controller is able to control the aircraft altitude as desired and has a disturbance rejection behavior and the response speed can be easily adjusted by specification of the equivalent time constant. As the result, the controller design processes are less complex than other methods and the controller is still effective.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Swinging-up and stabilizing control of inverted pendulum on cart system by hybrid controller
    (2009-01-01)
    Asa, Ekachai
    ;
    Benjanarasuth, Taworn
    ;
    Komine, Noriyuki
    In this paper, a hybrid controller designed for swinging-up and stabilizing an inverted pendulum on cart system is presented. The energy control concept is employed for moving the cart back and forth until the total energy of kinetic energy and potential energy are changed enough to swing the inverted pendulum up to around the upright position within the ranges of pendulum angle and angular velocity specified in the switching condition. After that, the stabilizing controller is 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 and experimental results in swinging-up the pendulum from its pendant position to around the position within a limited travel of the cart without pre-assigned cart's position and stabilizing the inverted pendulum on cart are also shown for comparison.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    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.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Implementation of swinging-up and stabilizing controllers for inverted pendulum on cart system
    (2008-12-01)
    Asa, Ekachai
    ;
    Benjanarasuth, Taworn
    ;
    Nundrakwang, Songmoung
    ;
    Ngamwiwit, Jongkol
    ;
    Komine, Noriyuki
    In this paper, an implementation of swinging-up and stabilizing controllers for 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 experimental results show that the designed controllers can be mutually operated with acceptable efficiency. © 2008 IEEE.