Chitwong, Sakreya

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Designing decoupler and PID controller for TITO system
(2014-01-01)
Dolpullop, Sasiprapa
;
Chitwong, Sakreya
This paper describes the two inputs - two outputs control theory. The theory is using the simplify decoupler filter that can reduce the disturbance arising from loop interaction. The system controls both the pressure and flow rate in the closed tank. The media of the process is water. The work includes four important aspects: Designing, Implementation and Test. In this design consist of two parts such as models of the process and decoupler. In this simulation was used a MATLAB to finding a suitable decoupler. In this implementation was used a personal computer, Pressure Transmitter, Magnetic Flow Meter, DP/PA coupler, Convertered IF 303,FI303 and The controller of SIEMENS S7 400 Modules which all of implements was created to control systems by used the technology of PROFIBUS to create a networked control system(NCS). In this test was used to compare performance of the old TITO systems with the new TITO system. © (2014) Trans Tech Publications, Switzerland.
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SIL Verification of Safety Instrumented System for Block Valve System in Gas Pipeline by Using Markov Model Methodology
(2017-01-01)
Kongtong, P.
;
Chitwong, S.
This paper presents about methods for evaluation of safety integrity level (SIL) which is significant to reduce risk of failure of block valve in gas pipeline system by using Markov Model method which refer to International standard IEC 61508/61511. The reason of using Markov Model method is that it takes less time and more flexible than other methods to determine SIL. This method uses a qualitative approach showing Average Probability of Failure (PFDavg) rate data and repairing time from model to implement in further process.
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Implementation of International Safety Standard EN ISO 13849 into Machinery of Tyre Industry
(2017-01-01)
Wongpiriyayothar, N.
;
Chitwong, S.
This paper presents application of international safety standard in risk assessment and risk reduction following by machinery directive. Many industries using machinery for manufacturing products have tendency to take risk from poor-quality of machinery design which may not be produced according to international safety standard. This can lead dangerous situation to machine user. The new standard EN ISO 13849-1 [1] which replaced the old standard EN 954-1 [2] definitely in December 2011 made machine designer not be familiar with the new concept and feel confused due to most of concerned parameters shown in term of statistic value that there are difficulty in interpretation and understanding. In the present, there is still lack of examples of implementation this standard into machinery of specific industry, especially in tyre industry. Therefore the objective of this paper is made for implementation this safety standard into machinery of tyre industry in order to build a safe situation for machine user.
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Implementation of self-tuning fuzzy PI controller on DCS for flow control system
(2015-01-01)
Assawathanatorn, K.
;
Anuntahirunrat, K.
;
Chitwong, S.
In case of changing a communication between field instruments and controller from analog signal into digital signal or of changing a model of plant, performance of controller is degraded because of the fixed controller parameters such as PID controller. To solve this problem, a self-tuning PID controller is proposed. One of a popular self-tuning method is self-tuning fuzzy. Many researchers have been presented the self-tuning fuzzy PID controller. In this paper, we present implementing of self-tuning fuzzy PI controller for flow control system. Both fuzzy and PI controller is implemented on distributed control system (DCS) as controller at which communication between field instruments and distributed control system is via both the analog input and output modules as analog signal in range of 4-20mA and digital signal as Profibus PA. The PI controller parameters, proportional gain and integral time, from auto-tuning method is used to control plant, flow control system, by using analog signal at which result shows that flow process variable reaches to flow set point. The same PI controller parameters is applied for PROFIBUS PA at which results shows that flow process variable oscillates because of effect of delay-time taken place from communication between field instruments and distributed control system.
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Developing harmonic power analyzer based on IEEE 1459-2010 Standard
(2012-01-01)
Wattanayingcharoen, P.
;
Detchrat, A.
;
Chitwong, S.
This paper describes the developing harmonic power analyzer based on IEEE 1459-2010. This instrument use the power definitions present in IEEE standard, the instrument use ARM Cortex-M3 high performance 32bits microcontroller to calculate electric power from isolated current and voltage transducers, and compare the experimental results with commercial instrument.

Chitwong, Sakreya

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