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Discrete-Time PIDA Controller Designed by Kitti’s Method with Bilinear Transform
Krit Smerpitak,Prapart Ukakimaparn,Thanit Trisuwannawat,Prapaisri La-orsri 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
This paper presents a new method for designing the PIDA (Proportional-Integral-Derivative-Acceleration) Controller for a third order system. Just changing of the discretization from Zero Order Hold (ZOH) to Bilinear Method, the results from simulations shown that all desired specifications can easily met with better than usual by changing only one parameter.
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.
An Unmanned Bicycle versus Linear Quadratic Optimal Controls
Krit Smerpitak,Prapart Ukakimaparn,Thanit Trisuwananwat,Sitthikorn Trakoonkootaworn 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
The dynamic model of an unmanned bicycle was presented with linear quadratic optimal controls. An unmanned bicycle uses a dynamic equilibrium model of gravity and centrifugal force in order to control its steering on the purpose to acceleration’s control. The linear quadratic optimal controls have been designed based on linear control theory. The initial state responses from simulation for the camber angle and its estimator have shown that even they are started from difference initial conditions, but both of them have been reached the zero state rapidly. For the camber angle rate and its estimator, they reach to the zero state as well. Although, the oscillation in the transient response is occurred. Hence, it concludes that the Linear Quadratic Regulator can be replaced by Linear Quadratic Gaussian for economy.
Krit Smerpitak,Woravut Jearnpanitpong,Amphawan Julsereewong,Teerawat Thepmanee 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
This paper presents a practical technique to design and implement a cooperative control of two groups with three conveyors and two rail guided vehicles (RGVs) by using two master and two slave programmable logic controllers (PLCs), respectively. The controlled conveyors and RGVs are utilized for work-in-process (WIP) movements between a corrugator and six printing machines in a manufacturer of corrugated paper boxes. The proposed technique is based on the use of wireless bridge/base stations modeled Ubiquiti Rocket M5 and Loco M5 for interconnections of two master PLCs modeled Omron CJ2M-CPU31, two slave PLCs modeled Omron CP1L-M40DT-D and connected with Omron CP1W-EIP61 module, and a host application over a control network to communicate with each other through EtherNet/IP technology. Input and output devices of each controlled subsystem are hardwired to each PLC. The transmission and reception schemes to enable real-time input/output data exchanges between the PLCs are specified with tag names for cyclic communications on data links. The proposed multi-PLC control system for WIP movements can operate in accordance with the manufacturer’s requirements.
The Application of Finite Element to Analyze the Accuracy for Radar System
Krit Smerpitak,Nareerat Boonsung,Prapart Ukakimaparn 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Radar is one choice for level measurement in petrochemicals industry with high degree of accuracy. The radar provides a non-contact sensor that is virtually unaffected by change in process temperature, pressure or the gas vapor composition within a vessel. The measurement accuracy is unaffected by change in density, conductivity and dielectric constant of product being measure or by air movement above the product. These benefits have become more significant to the process industry since the advent of radar owing to low maintenance cost as there are no moving parts. This is the reason radar are so popular for industrial applications presently. However we found that some measurement value deviates from the actual level after the radar is in operation for few years. We have used Finite Element Technique to investigate for deviation, as our case study.
Load Swing Control of an Overhead Crane
Pittaya Pannil,Krit Smerpitak,Visitsak La-orlao,Thanit Trisuwannawat 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper proposed a controllers design method for controlling the load swing of an overhead crane. By addition of the quadratic derivative of state variables term in the usual standard performance index for Linear Quadratic Gaussian (LQG) optimal control as an extra weighting function to play the role in this task. The results revealed that the swing of the load can be decreased at numerous requirements with excellence. How to select the suitable weights for control is also suggested.