Smerpitak, Krit

Preferred name

Smerpitak, Krit

Main Affiliation

School of Engineering

krit.sm@kmitl.ac.th

Now showing 1 - 10 of 17

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Applying radar chart for process control behavior
(2018-06-08)
Pongswatd, Sawai
;
Smerpitak, Krit
This paper presents the technique to show the controller parameters value that can support decision making of controller action and instruments, actuator operation. In addition, energy consumption is detected of any points of process operation. The paper describes method to detect and collect the assigned process control parameters from process components then display their parameters by radar chart. All of assigned parameters are used to construct the plotted of radar figure. The paper designs background and foreground by representation with rectangular array and length of each spoke in radar chart is proportional to magnitude of set value(SV), manipulate value(MV), process value(PV) of PID controller parameters. In addition, watt power (W) of energy consumption in the process is detected and stored. Each spoke of radar chart represents each parameter that converts to scale as 0-100%. The script functions are developed at the SCADA (Supervisory Control and Data Acquisition) station to detect, collect and scale, then store detected parameters in database. The experiments perform in case study of level loop control of water tank processes by using a proportion-integral-derivative (PID) function in the Programmable Logic Controller (PLC) and Wonderware InTouch SCADA software. The technique can apply for exiting SCADA to create the radar chart. Nevertheless, the new version of SCADA software can support the feature but it depends on cost license fee. Moreover, the technique can support the operators and engineers to make decision of process devices performance (instrument, actuator, controller), process operation and condition.
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Bilinear discrete PID×(n-2) stage PD cascade controller for SISO systems
(2012-12-01)
Smerpitak, Krit
;
Ukakimaparn, Prapart
;
Trisuwannawat, Thanit
;
Lavanprakai, Prera
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. © 2012 ICROS.
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An unmanned bicycle versus linear quadratic optimal controls
(2012-12-01)
Smerpitak, Krit
;
Ukakimaparn, Prapart
;
Trisuwananwat, Thanit
;
Trakoonkootaworn, Sitthikorn
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. © 2012 ICROS.
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Discrete-time PIDA Controller designed by Kitti's method with Bilinear transform
(2012-12-01)
Smerpitak, Krit
;
Ukakimaparn, Prapart
;
Trisuwannawat, Thanit
;
La-Orsri, Prapaisri
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. © 2012 ICROS.
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Simple CCO using cciis and S-R latch and its application
(2010-06-01)
Smerpitak, Krit
;
Julsereewong, Amphawan
;
Pongswatd, Sawai
;
Sasaki, Hlrofumi
This article presents a, simple circuit technique based on commerciallyavailable devices to realize current controlled, oscillator (CCO) with twolow-impedance input terminals. By suitably setting two input signals, the linearfrequency-current relation of the proposed CCO can be either positive ornegative slope in the same circuit configuration. The oscillating outputfrequency linearly proportional to the difference between two input currents canbe obtained. The realization method is employed in second-generation currentconveyors (CCIIs) and, Set-Reset (S-R) latch. Experimental results verifyingperformances of the proposed, CCO are closely agreed, with expected, values. Toshow the usefulness of the proposed, oscillator, an application example incurrent-mode variable- frequency control for buck converter is also included.ICIC International © 2010.
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Hmi implementation using radar chart for dual-loop system
(2019-08-01)
Pongswatd, Sawai
;
Smerpitak, Krit
;
Kummool, Sart
This article presents a method to implement the Human Machine Inter-face (HMI) for providing high visibility of dual-loop system to encourage good operations and maintenance practices. The proposed method is based on the employment of radar chart to display key performance metrics of simultaneous and independent control of two identical loops for extensive event monitoring. Two level control loops utilizing two Proportional-Integral-Derivative (PID) function blocks of a single Programmable Logic Controller (PLC) are used as the case study to show the workability of the proposed HMI implementation. Each loop consists of a transmitter for measuring the controlled level an inverter for inverting the PLC output to adjust a pump speed, and a power meter form easuring the pump power consumption. The transmitter outputs from both control loops are applied to the PLC analog input module, and then separately scaled to be available to each PID block. The PLC analog output module is used to pass the PID block outputs for manipulating inlet flow rates. The performance metrics including the set point, process variable, manipulated variable, and pump power consumption of both control loops are detected and collected by the HMI/Supervisory Control and Data Acquisition (SCADA)station. All detected data of four performance metrics are represented on the axes of radar chart in real time by using the Wonder ware In Touch software. The script functions to save and load the specified data to the SQL server database are also created on the HMI/SCADA station. Experimental results confirm that the proposed HMI implementation can function correctly.
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Dual slope analog-to-digital converter using simple CCII-based integrator
(2010-10-01)
Smerpitak, Krit
;
Julsereewong, Amphawan
;
Sasaki, Horofumi
This article presents a dual slope analog-to-digital converter (ADC) using second generation current conveyor (CCII)-based integrator. In comparison with the previously reported dual slope ADCs with grounded capacitor, the proposed configuration offers simpler structure and fewer components while utilizing the positive reference voltage. Experimental results are given to confirm the operation of the proposed ADC. ICIC International © 2010 ISSN.
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A step-down switched-capacitor AC-DC converter with double conversion topology
(2017-02-01)
Abe, Kanji
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Smerpitak, Krit
;
Pongswatd, Sawai
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Oota, Ichirou
;
Eguchi, Kei
In the field of portable electronic devices, a small and light AC-DC converter or AC adapter has been required in these last few decades. To meet such demands, a switched-capacitor (SC) AC-DC converter draws many researchers’ attentions in recent years. It is known that the SC AC-DC converter can realize smaller size and lighter weight than transformer-based AC-DC converters, because no magnetic component is required to design the SC AC-DC converter. In previous studies, several AC-DC converters succeeded in downsizing and light-weighting by using SC techniques. However, the power efficiency of conventional SC AC-DC converters is still low, and their control method is complicated. To overcome these problems, a step-down SC AC-DC converter with double conversion topology is proposed in this paper. The proposed converter consists of a full waveform rectifier with a big capacitor and two converter blocks. In each converter block, the 1/3 × step-down conversion is performed by connecting three capacitors in series, where electric charges stored in these capacitors are averaged by using series-connected flying capacitor. By connecting these converter blocks in series, the 1/9 × step-down conversion is realized by controlling power switches by non-overlapped two-phase clock pulses. Therefore, unlike the conventional converters using multiphase clock pulses, the proposed converter can achieve not only simple circuit control but also small ripple noise. Furthermore, the reduction of output ripple leads to the improvement of power efficiency. To help readers’ understanding for the proposed converter, first, a simple four equivalent circuit of the proposed converter is derived theoretically. The characteristics of the proposed converter are clarified by the theoretical analysis. Then, in order to demonstrate the effectiveness of the proposed converter, the proposed converter is implemented by simulated program with integrated circuit emphasis (SPICE) simulator. The validity of the theoretical results is confirmed by the SPICE simulation. Finally, the feasibility of the proposed converter is confirmed by experiments implemented on a breadboard.
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Design and implementation of internet-based remote monitoring for continuous vacuum pans in sugar factory
(2018-05-01)
Pongswatd, Sawai
;
Smerpitak, Krit
;
Weerathaweemas, Songchai
;
Chamnanakson, Saithan
This paper presents a practical technique to design and implement the Inter- net-based system for remotely monitoring key performance indicators (KPIs) in operation of vacuum pans for sugar crystallization by using supervisory control and data acquisi- tion (SCADA) software, which provides web-enabled human machine interface (HMI). The remote monitoring system for the DECHAROEN™ continuous vacuum pans is de- scribed as an illustrative case study to verify the proposed technique performance. At the remote site, the programs (or script functions) based on web services were developed for detecting and collecting the KPIs in the text file format from the operator workstation of the host system in the raw sugar plant. The created text files are transferred to the data center through the Internet. At the data center, the database was created using XAMPP software, and the website and web pages were built using HTML and CSS. The proposed system can be useful in performance analysis for continuous quality improvement. Experimental results demonstrating the proposed monitoring system are also included.
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Simplified and systematic plc programming technique: A case study of burner control for thermal oil heater
(2015-01-01)
Khaefoi, Supakit
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Smerpitak, Krit
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Pongswatd, Sawai
;
Julsereewong, Amphawan
This article presents a technique to simplify and systematize programmable logic controller (PLC) programming for ease of engineering. A PLC-based burner control for thermal oil heater is examined as an illustrative case study. Based on the proposed method, two example cases of PLC programming for the modified burner control by adding input devices and alarm and shutdown conditions are described. Performance of the proposed technique is demonstrated through experimental tests done by nine engineers with difference experiences for ladder-logic-based PLC programming. Experimental results show that the proposed technique provides ease of reusing and modifying the existing ladder logic code and saving of time for writing the programs.

Smerpitak, Krit

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