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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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The design of PID controller for track following control of hard disk drive using Coefficient Diagram Method
(2011-12-01)
Chaoraingern, Jutarut
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Vaidee, Worapon
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Trisuwannawat, Thanit
;
Numsomran, Arjin
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Tipsuwanporn, Vittaya
This paper presents the design of PID controller for track following control of hard disk drive using Coefficient Diagram Method (CDM). For this reason, Track following control of hard disk drive process has many disturbances from internal and external sources, so determining satisfactory controller parameters to stabilize control system and satisfying response specification is difficult. The proposed PID controller design using Coefficient Diagram Method (CDM) based on proper choosing the coefficients of the characteristic transfer function of the closed loop control system in accordance with stability index and equivalent time constant is applying an uncomplicated and convenience technique to controller design of Track following control in hard disk drive process. Matlab simulation results shown that CDM design is fairly stable and robust whilst giving the convenience in controller's parameters adjustment. © 2011 ICROS.
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The design of PID controller for track following control of hard disk drive using coefficient diagram method
(2011-01-01)
Chaoraingern, Jutarut
;
Vaidee, Worapon
;
Trisuwannawat, Thanit
;
Tipsuwanporn, Vittaya
;
Numsomran, Arjin
This paper presents the design of PID controller for track following control of hard disk drive using Coefficient Diagram Method (CDM). For this reason, Track following control of hard disk drive process has many disturbances from internal and external sources, so determining satisfactory controller parameters to stabilize control system and satisfy response specification is difficult. The proposed PID controller design using Coefficient Diagram Method (CDM) based on proper choosing the coefficients of the characteristic transfer function of the closed loop control system in accordance with stability index and equivalent time constant is an uncomplicated and convenience technique for applying to Track following control in hard disk drive process. Matlab simulation results shown that PID controller using CDM technique is fairly stable and robust whilst give the convenience in controller's parameters adjustment. © 2011 SICE.
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Smith predictor design by CDM for temperature control system
(2010-12-01)
Puawade, Pruetti
;
Boonpranchoo, Vichitpon
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Tipsuwannaporn, Vittaya
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Numsomran, Arjin
Smith Predictor control is theoretically a good solution to the problem of controlling the time delay systems. However, it seldom gets use because it is almost impossible to find out a precise mathematical model of the practical system and very sensitive to uncertain system with variable time-delay. In this paper is concerned with a design method of smith predictor for temperature control system by Coefficient Diagram Method (CDM). The simulation results show that the control system with smith predictor design by CDM is stable and robust whilst giving the desired time domain system performance. ©ICROS.
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Smith predictor design by CDM for temperature control system
(2009-11-01)
Roengruen, P.
;
Tipsuwanporn, V.
;
Puawade, P.
;
Numsomran, A.
Smith Predictor control is theoretically a good solution to the problem of controlling the time delay systems. However, it seldom gets use because it is almost impossible to find out a precise mathematical model of the practical system and very sensitive to uncertain system with variable time-delay. In this paper is concerned with a design method of smith predictor for temperature control system by Coefficient Diagram Method (CDM). The simulation results show that the control system with smith predictor design by CDM is stable and robust whilst giving the desired time domain system performance.
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Optimization parameters of rotary positioner controller using CDM
(2009-11-01)
Meemongkol, A.
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Tipsuwanporn, V.
;
Numsomran, A.
The authors present optimization parameters of rotary positioner controller in hard disk drive servo track writing process using coefficient diagram method; CDM. Due to estimation parameters in PI Positioning Control System by expected ratio method cannot meet the required specification of response effectively, we suggest coefficient diagram method for defining controller parameters under the requirement of the system. Finally, the simulation results show that our proposed method can improve the problem in tuning parameter of rotary positioner controller. It is satisfied specification of performance of control system. Furthermore, it is very convenient as a fast adjustment damping ratio as well as a high speed response.
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Smith predictor design by CDM for temperature control system
(2007-12-01)
Thuengsripan, Santi
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Suksri, Tianchai
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Numsomran, Arjin
;
Kongratana, Viriya
;
Roengruen, Prapas
Smith Predictor control is theoretically a good solution to the problem of controlling the time delay systems. However, it seldom gets use because it is almost impossible to find out a precise mathematical model of the practical system and very sensitive to uncertain system with variable time-delay. In this paper is concerned, with a design method, of smith predictor for temperature control system by Coefficient Diagram Method (CDM). The simulation results show that the control system with smith predictor design by CDM is stable and robust whilst giving the desired time domain system performance. © ICROS.
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FFC incorporating PI controller designed by CDM for temperature control systems
(2002-01-01)
Benjanarasuth, T.
;
Kumpanya, D.
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Komine, N.
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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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