Benjanarasuth, Taworn

Preferred name

Alternative Name

Benjanarasuth, T.

Main Affiliation

School of Engineering

taworn.be@kmitl.ac.th

Now showing 1 - 10 of 34

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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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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.
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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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Two-degree-of-freedom simple servo adaptive control for SCARA robot
(2010-12-01)
Benjanarasuth, Taworn
;
Sowannee, Noppon
;
Naksuk, Nirut
This paper presents an application of two-degree-of-freedom simple servo adaptive control scheme in controlling DDR-type two-links SCARA robot. The SCARA robot is widely used in industries and it is generally desired to control its movement along some periodic trajectory to perform some repeated tasks. A proper control scheme is therefore required. Among various control techniques, two-degree-of-freedom simple servo adaptive control scheme possesses a prominent aspect in that it can force the systems to follow the desired reference model while the servo gain can be freely assigned to tune the disturbance rejection property independently. The simulations in applying the two-degree-of-freedom simple servo adaptive control scheme to control the SCARA robot are demonstrated to verify the applicability and effectiveness of this control technique. The effect of tuning the servo gain is also observed. ©ICROS.
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Fuzzy I-PD controller for level control
(2006-12-01)
Chatrattanawuth, Wicharn
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Suksariwattanagul, Napatpong
;
Benjanarasuth, Taworn
;
Ngamwiwit, Jongkol
This paper introduces a level control system using a fuzzy I-PD controller. The proposed controller composes of Mamdani fuzzy I and Mamdani fuzzy PD controllers and is adjusted to meet the desired control system performances both in transient state and steady state. The simulation results in controlling the level processes by using the fuzzy I-PD controller with the same parameters (proportional gain, integral gain and derivative gain) as the conventional I-PD controller are shown in this paper. © 2006 ICASE.
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FFC incorporating PI controller designed by CDM for temperature control systems
(2002-01-01)
Benjanarasuth, T.
;
Kumpanya, D.
;
Komine, N.
;
Ngamwiwit, J.
A design of PI controller to be used to control the first order lag plus dead time process, such as a temperature process, by the coefficient diagram method (CDM) is investigated. The factor of the dead time of the process is first approximated to be the first-order by the Fade approximation. The responses of the temperature control system designed by CDM satisfy both transient and steady state specifications. However, the transient response generally still has long rise time. In order to improve the speed of the system response, a feedforward controller (FFC) is added into the PI control system. The structure of the FFC is a phase lead structure with two designed parameters and one derivative time obtained from reaction curve of the temperature process. The experimental results show that the performance of the PI control system with properly assigned FFC has short rise time, no overshoot and good disturbance rejection properties.
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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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Simplified design of I-P controller for speed control of two-inertia system
(2008-12-01)
Suathed, Sataporn
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Nundrakwang, Songmoung
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Benjanarasuth, Taworn
;
Ngamwiwit, Jongkol
;
Komme, Noriyuki
In this paper, a simplified design of I-P controller for a higher-order plant by using the concept of plant model reduction and the CRA method with less number of characteristic ratios α, is presented. The Padé type approximation method is used to obtain a lower-order plant model of the higher-order plant first. Then an I-P controller is designed for the model by using CRA method with the appropriate values of characteristic ratios in order to obtain the closed-loop step response without overshoot. Finally, the designed I-P controller is employed to control the original higher-order plant. The sufficient performance of the speed control of a two-inertia system employing the I-P controller designed from its lower-order plant model is shown by the simulation results. The simulation results of the speed control in term of varying the value of a factor β greater than one in the design, tracking the motor speed, and rejecting the disturbance effect are also investigated. © 2008 SICE.
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PI controller design with feedforward by CDM for level processes
(2000-12-01)
Kumpanya, Danupon
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Benjanarasuth, Taworn
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Ngamwiwit, Jongkol
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Komine, Noriyuki
A second-order level process controlled by PI controller designed from coefficient diagram method (CDM) will meet the desired performances both in transient and steady-sate response. However, the transient response generally still has long rise time. This paper presents an additional idea to improve the speed of the system response by including a feedforward controller (FFC) in the closed-loop system. The structure of the FFC is a phase lead structure with a parameter that can be varied greater than one. The faster step response of the controlled system can be obtained while the rejection speed of the effect due to constant output disturbance is not affected by the proposed FFC.
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PLL in cooperated with PI controller for flow control system
(1999-12-01)
Wanchana, S.
;
Benjanarasuth, T.
;
Komine, N.
;
Ngamwiwit, J.
This paper presents the flow control system using the phase-locked loop technique in cooperated with PI controller. The PI controller is utilized to pull the flow rate of the system into the phase-locked loop locking range and the steady state flow rate will be controlled later by the phase-locked loop. An experimental system is implemented to evaluate the performance of the flow control system using the proposed control method. The experimental results in controlling the system in the laboratory show that the overshoot is approximately 10% for the 50% step input of the maximum flow rate and the steady-state error is smaller than ±2%. The experimental results also indicate that the effect of load disturbance is rapidly rejected.

Benjanarasuth, Taworn

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