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Thanit Trisuwannawat,Jutarut Chaoraingern,Arjin Numsomran 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
The author presents following control of the hard disk drive using derivative state constrained optimal H2 controls (H2?). The study in this paper concern to the control amount of NRPE (non repeatable position error) and PES (position error signal) of track following control in the hard disk drive process by the effective method. The derivative state constrained optimal H2 control (H2?) has been formulated to suppress the rate of changes of state variables. It is suitable for the oscillated system and able to be used in non linear system. Thus, the derivative state constrained optimal H2 control (H2?) has been applied to track following control in the hard disk drive for increasing the accuracy of head positioning by decreasing the effect from oscillation, variation and non linearity characteristic in its system. Finally, the simulation results show that our proposed method can satisfy the design specifications of track following servo control system effectively.
DISCRETE TIME ROBUST INTEGRAL SERVO WITH PID × (n-2)/2 STAGE PDA CONTROLLERS FOR UNSTABLE SYSTEMS
Pittaya Pannil,Prachaya Achariyapagon,Thanit Trisuwannawat 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
This paper presents a design method for robustness stability results of unstable systems using forward controller employed to PID × (n-2)/2 Stages PDA Controllers which applied to integral servo problem, both continuous and discrete-time control systems, the root loci of this design method are shown the robustness results with the excellence transient response of this closed loop systems, moreover, in case of increasing controller loop gain, the system is still robustly stabilizable with better performance.
Design of PID Controller for the Modified Quadruple-Tank Process using Inverted Decoupling Technique
Arjin Numsomran,Vittaya Tipsuwanporn,Thanit Trisuwannawat,Kitti Tirasesth 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper presents the approach to design PID controller for a modified quadruple-tank process using inverted decoupling technique. In case of non-minimum phase, TITO system, such as modified quadruple-tank process which can’t be controlled by PID controller with standard decoupling technique because the system can’t be stabled by saturating manipulate signal. With the proposed method, The inverted decoupling controllers, decreasing the cross coupling between inputs and outputs, transform TITO plant transfer function model into SISO form so that SISO controller for each SISO model can be designed by Root Locus Technique easily and efficiently. PID controller with inverted decoupling can stabilize an unstable non-minimum-phase system and minimize several undesirable influences from an interaction in TITO process. The results from control system design can be illustrated by the experiments.
Closed-Form Formulas for Continuous/Discrete-Time PID Controllers’ Parameters
Numchai Narkvitul,Prapart Ukakimaparn,Thanit Trisuwannawat 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This paper proposes the formulas for finding the Proportional gain, Integral gain and Derivative gain simultaneously of the PID controllers in both continuous-time and discrete-time systems. Once, the satisfied PID controller in continuous-time system is obtained. Then, just discretises it by using trapezoidal approximation or bilinear transformation, the discrete-time PID controller is easily achieved as well. The results from simulations revealed that this discrete-time controller provides a faster response than the continuous-time case.
Discrete Robust PID×(n-2) Stage PD Cascade Controller
Pittaya Pannil,Prachaya Achariyapagon,Thanit Trisuwannawat 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper presents a design method for discrete-time parallel with continuous-time design for the two degree of freedom (2DOF) control system using PID (Proportional-Integral-Derivative)×(n-2) stage PD as a cascade controller for a class of n<SUP>th</SUP> order plant. Both, transient and steady state response specifications are suddenly met when the forward controller is employed. The root loci of this method are shown that the closed loop system is robustly stable with excellence.
Bilinear Discrete PID×(n-2) stage PD Cascade Controller for SISO Systems
Krit Smerpitak,Prapart Ukakimaparn,Thanit Trisuwannawat,Prera Lavanprakai 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
To obtain the response of sampled system better than of using the Zero Order Hold (ZOH) method. The approximation to the integral using Bilinear discretization is proposed. The results from simulation show that the obtained response from the bilinear or Tustin method is better than the ZOH method at the same sampling time. However, if another of descretization method is necessaries, the overall closed-loop system should be considered.
Design PID Controller for the Modified Quadruple-Tank Process using Root Locus
Arjin Numsomran,Vittaya Tipsuwanporn,Thanit Trisuwannawat,Kitti Tirasesth 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents the approach to design the siso controller with Decoupling for a Modified Quadruple-Tank process. The structure of controller design can minimize several undesirable influences from an interaction in TITO Process. The decoupling controllers transform TITO plant transfer function model into SISO form so that SISO controller for each SISO model can be designed by Root Locus Technique easily and efficiently. The results from decoupling and SISO controller design can be illustrated by experiments.