Thepmanee, Teerawat

Preferred name

Thepmanee, Teerawat

Main Affiliation

School of Engineering

teerawat.th@kmitl.ac.th

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Integrating m-Machine scheduling into MRP
(2009-12-01)
Masuchun, Ruedee
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Masuchun, Wiboon
;
Thepmanee, Teerawat
This paper presents an approach to integrate the m-machine production scheduling into Material Requirements Planning (MRP). In general, generating MRP considers only Bill of Materials (BOM) and ignores capacity constraints and operating sequences; therefore, a production plan is unachievable when scheduling is actually performed next on shop-floor. That is why recent research has focused on executing both MRP and scheduling simultaneously. Our approach uses an integer linear programming model to plan and schedule concurrently to look right through the capacity constraints and operating sequences. The objective function of the proposed model considers both planning and scheduling purposes that is to minimize total inventory costs and order's tardiness. All significant and inevitable concerns when separately generating MRP and schedule are incorporated with the model through several constraints. Numerical results show that this model can be used to simultaneously generate reasonable MRP as well as feasible and optimal m-machine production schedule. © 2009 IEEE.
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An influential principal point on camera parameters
(2008-12-01)
Sirisantisamrid, Kaset
;
Thepmanee, Teerawat
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Tirasesth, Kitti
;
Matsuura, Takenobu
This paper proposes a method of camera calibration and the influence of principal point on camera parameters. The camera parameters are represented in terms of a set of intermediate parameters. The intermediate parameters and lens distortion coefficients are iteratively computed. The image coordinates are rectified on each cycle of iteration. Once the iteration is terminated, the initial parameters are computed from the obtained intermediate parameters. Then, the camera parameters and distortion coefficients are iteratively computed from the obtained initial parameters and the image coordinates are rectified too. In the experimental results, the proposed method is tested by change principal point to observe the influential principal point on camera parameters and compared the results with the conventional method.
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The technique to generate firing signal of converter for linear DC output
(2008-12-01)
Thepmanee, Teerawat
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Pongswatd, Sawai
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Ukakimapurn, Prapart
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Tirasesth, Kitti
The firing angle adjustment of ac-dc converter that adjust firing angle proportional to control signal. The dc output voltage is not linear. This paper presents the technique to generate the firing signal for ac-dc converter which has linear dc output voltage. This technique decoded the arccosine value as binary data and save in ROM, before compare with control signal. All digital circuits and ROM were constructed using Field Programmable Gate Array (FPGA) and Verilog Hardware Description Language (Verilog HDL) so that the proposed technique has small size and ease of implementation. The experimental results show the dc output voltage and output waveform that agree with the design. Moreover, this technique can be applied to multi-output for dual converter and 3- phase system. © 2008 SICE.
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Hybrid Posi cast - based PID - PDA Control Using System Identification for Continuous Tunnel Kilns
(2026-06-30)
Pannil, Pittaya
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Sungsorn, Teenapong
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Trisuwannawat, Thanit
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Julsereewong, Amphawan
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Thepmanee, Teerawat
This paper proposes a hybrid Posicast-based proportional-integral-derivative with proportional-derivative-acceleration (PID-PDA) controller for temperature regulation in delay-dominant continuous tunnel kilns. The controller is developed based on a system-identified second-order-plus-dead-time (SOPDT) model derived from industrial data and implemented in discrete time for programmable logic controllers (PLCs). A unified framework enables comparison with a standard PLC-based proportional-integral (PI) controller, an internal model control (IMC)-tuned PI controller, and a Smith Predictor-PI controller under identical conditions. Simulation results demonstrate faster response, negligible overshoot, and reduced tracking error, with improved settling time and lower, integral of absolute error (IAE), integral of squared error (ISE), and integral of time-weighted absolute error (ITAE), while maintaining comparable control effort. Robustness analysis confirms stable performance under plant perturbations, with IAE variations within approximately ± 10 (servo) and ± 1 (disturbance). The controller is validated on an Allen-Bradley PLC in a silicon controlled rectifier (SCR)-based heating system. Experimental results show improved steady-state performance, including reduced bias, lower mean absolute error (MAE) and root mean squared error (RMSE), reduced oscillation amplitude, and compliance within the ± 1 temperature band. The proposed approach provides a practical, robust, and high-performance solution for upgrading existing PLC-based systems without hardware modifications.
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Reliability modeling for automatic operation mode of FSWO&FSWB system
(2017-06-07)
Yuchomboon, Yutthana
;
Thepmanee, Teerawat
This paper applies FMEA and FTA approach which has been proved to be acceptable and widely applied in many applications of modeling and methods supporting the production system and the safety and/or maintenance manager to identify how subsystems and components could fail and what are the corresponding effects on the whole system, and to quantify the reliability parameters for complex systems. A case study represents that the automatic operation mode from the primary fuel switch to secondary fuel called FSWO (Fuel Switch Over) procedure, which is the process of switching fuels from natural gas to oil fuel. For FSWB (Fuel Switch Back), this is process of switching from oil fuel to natural gas. The numerical illustrations and results substantiate that the model approach capable of pointing out and quantifying the importance of each component in the system.
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Foundation fieldbus-based laboratory: A case study of Harmonas-DEO system
(2011-01-01)
Thepmanee, Teerawat
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Pongswatd, Sawai
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Julsereewong, Amphawan
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Julsereewong, Prasit
This paper presents a Foundation Fieldbus-based laboratory for education of automation infrastructure. Design and implementation of a level-control plant model using multi-vendor field devices is proposed. Harmonas-DEO fieldbus system is described as an illustrative case study for configuring and commissioning fieldbus segment, defining control strategy, designing human machine interface (HMI) screen, and troubleshooting. Fieldbus control valve diagnostics based on the use of Valstaff are also included. © 2011 SICE.
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Digital fieldbus-Analog system integration for revamping projects
(2013-01-01)
Thepmanee, Teerawat
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Pannil, Pittaya
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Pongswatd, Sawai
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Rerkratn, Apinai
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Julsereewong, Amphawan
This paper presents a system integration of modern digital fieldbus and traditional analog devices for revamping projects. Using temperature transmitter with Foundation Fieldbus technology and power regulator with 4-20 mA control input for temperature control based on a PID instruction of programmable logic controller (PLC) is examined as an illustrative case study. A portable plant model was designed and implemented for real hands-on training. In addition, basic network and device configurations as well as ladder logic program and graphical user interface creations are discussed. Experimental results of temperature control in the range of 40-60 °C verifying the proposed concept are also included.
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Sil assessment for tail gas treating process using layer of protection analysis
(2018-06-01)
Poomhuang, Jirawat
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Julsereewong, Prasit
;
Thepmanee, Teerawat
A tail gas treating process is one of pollution control processes in refineries and natural gas processing plants required to manage process safety. Based on IEC 61511 safety lifecycle, the safety must be maintained during all design, operation, and maintenance activities. This paper addresses an allocation of specific functions performed by a safety instrumented system (SIS) to protection layers in analysis phase of the safety lifecycle for the studied tail gas treating process. An application of layer of protection analysis (LOPA) process to evaluate three scenarios identified in a prior hazard and risk assessment by using a hazard and operability (HAZOP) study is proposed. The results obtained from the proposed assessment are the specifications of the safety function requirements and the safety integrity requirements. The safety integrity level (SIL) determination results can be utilized as the criterions for the safety instrumented function (SIF) design and engineering in order to conform the required SIL.
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Automatic SPRT module calibration using automated low thermal matrix scanners
(2011-08-12)
Thepmanee, Teerawat
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Namsirilert, Sumetha
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Pongswatd, Sawai
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Masuchun, Ruedee
In general, the process of the SPRT module calibration takes long time and requires all employees participation in the calibration process, and it also requires an expert for calculation of results and measurement uncertainty. All of these waste a vast amount of working time. Therefore, this paper provides the automatic SPRT module calibration process which can reduce the steps of calibration, resulting in process time reduction and the automatic process doesn't require the expert to calculate results and measurement uncertainty. © 2011 IEEE.
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Using genetic algorithm to manage and schedule temperature sensor calibration
(2011-01-01)
Thepmanee, Teerawat
;
Masuchun, Ruedee
Currently, generating a schedule to calibrate temperature sensors for both laboratory calibration and field calibration are very time-consuming and inefficient, especially when several temperature sensors await for being calibrated and the due dates are required to be specified in advance. General rule of thumb used is first-come-first-served but the due date is difficult to determine in advance. Moreover, overview of which standards will be required and, if required, at what temperatures each of them should be set to cannot be globally visualized. Another method is to calibrate those temperature sensors requiring same temperature together but the experience is strictly required to avoid overwhelming calculation time. This paper presents the application of scheduling technique using genetic algorithm to schedule temperature sensor calibration. The fitness function is to minimize the time required to calibrate all temperature sensors. Our method takes little time to generate good schedule while the due date of each temperature sensor can be at once stated and the global view of required standards can be anticipated for further preparation. Moreover, our method is easy to use and suitable for anyone without the experience in scheduling temperature sensors. © 2011 ISSN.

Thepmanee, Teerawat

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