Nundrakwang, Songmoung

Preferred name

Alternative Name

Nundrakwang, S.

Main Affiliation

School of Engineering

songmoung.nu@kmitl.ac.th

Now showing 1 - 7 of 7

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CDM based servo state feedback controller with minimum-order observer for crane system
(2006-12-01)
Puwan, Santi
;
Nundrakwang, Songmoung
;
Benjanarasuth, Taworn
;
Ngamwiwit, Jongkol
;
Komine, Noriyuki
In this paper, the design of servo state feedback controller with minimum-order observer by using the concept of Coefficient Diagram Method (CDM) for crane system is presented. An Integrator is augmented to the system so that the system will exhibit no steady-state error in the response to step input. In order to apply the CDM method, the mathematical model of the crane system must be firstly linearlized and converted into controllable canonical form by transformation matrix. Then feedback gain matrix, integral gain and observer gain matrix in sense of CDM can be obtained. The satisfied performances of the crane system controlled by the proposed controller are shown in simulation results. © 2006 IEEE.
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Hybrid controller for swinging up inverted pendulum system
(2005-12-01)
Nundrakwang, Songmoung
;
Benjanarasuth, Taworn
;
Ngamwiwit, Jongkol
;
Komine, Noriyuki
A hybrid controller for swinging up inverted pendulum system is proposed in this paper. The controller composes of two parts. The first part is the PD position control for swinging up the pendulum from the natural pendent position by moving the cart back and forth until the pendulum swings up around the upright position. The second part is a servo state feedback control designed by LQR which will be switched to stabilize the inverted pendulum in its upright position. The effectiveness and reliability of the proposed hybrid controller for swinging up inverted pendulum on cart are also shown by the experimental results. © 2005 IEEE.
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I-PD and PD controllers designed by CRA for overhead crane system
(2007-12-01)
Sridokbuap, Wanlop
;
Nundrakwang, Songmoung
;
Benjanarasuth, Taworn
;
Ngamwiwit, Jongkol
;
Komine, Noriyuki
An overhead crane system controlled by an I-PD controller incorporating with PD controller is presented in this paper. The characteristic ratio assignment method is employed to design the I-PD controller and the PD controller for controlling the position of trolley and for controlling the load swing angle of the overhead crane system, respectively. Using the concept of characteristic ratio assignment method, the speed of the step response can also be increased by using a design factor k. The simulation results show that the step response can reach to the desired position without overshoot and with small load swing angle. The slightly change of the step responses when changing the parameters of the overhead crane system are also shown. The simulation results also show that when the speed of the step response is increased, the load swing angle is large related to the speed increased while the disturbance effect rejection is fast. © ICROS.
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Multivariable control of overhead crane system by CRA method
(2008-12-01)
Nundrakwang, Songmoung
;
Benjanarasuth, Taworn
;
Ngamwiwit, Jongkol
;
Komine, Noriyuki
In this paper, three controllers, namely I-PD, PD and I-P controllers designed by CRA method for simultaneously controlling the trolley position, load-swing angle and hoisting rope length of the overhead crane system is proposed. The non-linear model of the crane system is first approximated to be three transfer functions in accordance with the trolley position, load-swing angle and hoisting rope length respectively. Then, the corresponding parameters of the I-PD, PD and I-P controllers are designed independently based on the appropriate values of generalized time constant and characteristic ratios. The implementation results show the good performances of the overhead crane system controlled by these controllers. The speed adjustment effects and fast rejection of the disturbance effect occurred at the input force of the trolley are also shown by the experimental results. © 2008 SICE.
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Hybrid controller for inverted pendulum system
(2008-12-01)
Panya, Samatthachai
;
Benjanarasuth, Taworn
;
Nundrakwang, Songmoung
;
Ngamwiwit, Jongkol
;
Komine, Noriyuki
In this paper, a hybrid controller designed for swinging up and stabilizing an inverted pendulum on cart system is presented. The controller composes of a PD controller and a sliding mode controller. The PD controller is implemented to control the position of the cart to swing up the pendulum from the natural pendent position to around the upright position, while the sliding mode controller is implemented to stabilize the inverted pendulum in the upright position. Root-locus method is applied to design the PD controller and LQR method is employed to design the sliding mode controller. The implementation results of the proposed hybrid controller are shown in this paper. © 2008 IEEE.
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Simplified Design of I-P Controllers for Two-Inertia Speed Control Systems
(2008-12-01)
Benjanarasuth, Taworn
;
Nundrakwang, Songmoung
;
Panya, Samatthachai
;
Komine, Noriyuki
A simplified design of I-P controller by the concept of model order reduction of a higher-order plant and by the CRA method with less number of characteristic ratios α<inf>i</inf> is presented in this paper. Two model order reduction techniques are employed to obtain the reduced order models of a higher- order plant first. Then the I-P controllers are designed for the reduced order models by using CRA method with the appropriate values of characteristic ratios and of the generalized time constant in order to obtain the closed-loop step responses without overshoots. Finally, the designed I-P controllers are employed to control the original higher-order plant. The acceptable performances of the speed control of a two-inertia system employing the proposed I-P controllers designed from the reduced order models are still obtained as verified by the simulation results. Tracking the retarded motor speed and disturbance rejection are also investigated. © 2008 IEEE.
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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.

Nundrakwang, Songmoung

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