KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 10 of 10

Some of the metrics are blocked by your
consent settings
A nonintrusive beef grading evaluation based on marbling fat imaging by using K-Means Clustering Technique
(2024-03-01)
Pilasombut, K.
;
Tavitchasri, P.
;
Manop, C.
;
Jirasuwankul, N.
An alternative technique of beef quality assessment and grading was proposed using image analysis based on the K-means clustering algorithm as a semi-automated and nonintrusive approach. An input image of the rib-eye meat area was converted into L*a*b* color space, followed by classifying groups of features over the spatial domain. By performing a search and cluster, iterating the features of the target image in a*b* axes resulted in several distinct image zones categorized by different K-groups of features. Marbling fat was estimated in conjunction with quality assessment as an arbitrary grading system. Experimental testing on both synthetic and real image data suggested accuracy better than 95% of averaged. As comparison to conventional methods, this technique is nonintrusive, nondestructive, fast and economic for application and implementation as a measuring tool in the meat research industry.
Some of the metrics are blocked by your
consent settings
Energy Conserving in Power Plant: A Case Study of Practical Demand Cutting in Power Station Service System
(2024-01-01)
Pingyos, K.
;
Jirasuwankul, N.
;
Chandee, S.
This paper proposes an energy conserving practice in gas turbine and combined cycle power plant (GTCC) during the plant operating in reserve shutdown mode. By using demand cutting in plant station services system, which was a case study of one unit combined cycle system of the twos in Wang-Noi power plant block-4, EGAT-Thailand. The results from the field data illustrated that, among available technical possibilities during the plant operating in reserve shutdown mode, demand cutting in circulating and cooling water pump system (CWP), by redirecting and replacing the large, conventional circulating water circuit, with the new one of fractional flow capacity and the driven motor, was the promised and effective approach. The best practice on energy conserving of the CWP system during the post commissioning period, was recorded as much as 50% in averaged of demand reduction when compared to the base case of the pre-commissioning period. It finally turned out to be approximately 556 MWh of the expected energy conserving per year.
Some of the metrics are blocked by your
consent settings
A Faulty Paralleled CSI-Fed Induction Motor Drive: Practical Field Tests, Analysis and Problem Solving
(2020-07-01)
Jirasuwankul, N.
;
Boonseng, C.
In this communication, a case study of practical field tests, analysis and problem solving of a faulty, paralleled current source inverter (CSI)-fed on induction motor drive is proposed. Since the induction motor and the drive system, which were installed and lasting over 10 years of operation in a cement kiln plant, was exposure to the problematic of abnormal temperature rising and having damaged cabling terminals. To tackle the problem, field testing data, evidence and diagnostic suggestion of the system was collected and analyzed. Key finding reveals that the paralleled CSI causes mismatching, phase-shifted, current flows into all three-phase stator windings, and thus consecutively resulting in excessive heat losses. As a result of data analysis, the corresponding method of problem solving has been taking into accounted. By tuning up the VFD's serial reactor, together with replacing and re-installing the new feeder cables and the induction motor after overhauled, respectively. The system is finally recoverable and ready to service with healthy conditions.
Some of the metrics are blocked by your
consent settings
Design and Testing of Low Loss Distribution Transformer for Non-Linear Loading Current
(2018-07-02)
Tandeaw, P.
;
Manop, C.
;
Jirasuwankul, N.
Distribution transformers are typically designed to operate under linear loading current. Nowadays, an emerging of modern electric loads that equipped with power conversion devices, it is inevitable that, the transformers are subjected to supply non-linear current. Those are resulting in a considerable increment of heat loss, temperature rising and shortening of insulation lifespan. In case of planning for retrofit or new utility system design, replacing conventional transformer with the low loss one is introduced. This paper therefore proposes a design and testing of low loss transformer using K-Factor and modified winding eddy current loss (WEC). Test results show that efficiency and temperature rise of the new design outperforms conventional one under standard testing of linear and non-linear loads.
Some of the metrics are blocked by your
consent settings
Visualization and Estimation of Temperature from Glowing Hot Object by Artificial Neural Network and Image Analysis Technique
(2018-01-01)
Jirasuwankul, N.
This paper proposes alternative technique to estimate temperature of glowing hot objects with application of artificial neural network (ANN) and image analysis techniques. Regardless of using the cutting edge technology or sophisticated sensor such as 2D thermo-imaging equipment, an approximated thermo-imagery of the glowing hot object can be reconstructed by a well-trained ANN model together with image analysis in RGB color space. By training the model with data along the Blackbody locus from the CIE-1931 chromaticity chart and using three normalized individual monochromatic R, G and B images as inputs, the processed image having correlated color temperature (CCT) is finally obtained. Experimental results show that averaging error of the estimated temperature can be achieved with 10% for the reddish-yellowish hot objects and less than 10% for the bright-yellow one respectively.
Some of the metrics are blocked by your
consent settings
The classification of regular and defected low voltage XLPE cable by using polarization and depolarization current method
(2017-10-19)
Singhasivanon, J.
;
Manop, C.
;
Pattanadech, N.
;
Jirasuwankul, N.
Electric cable is an important part of utility power and distribution system. In order to keep the system operation safely and reliable, acceptance testing for cable is necessary not only inservice but also manufacturing process. This paper proposes a novel testing technique which is able to classify the difference between normal and defective low voltage XLPE cable, namely polarization and depolarization current technique (PDC). In this study, PDC testing of low voltage XLPE cable was performed comparatively among five different cases: cable contaminated with a piece of paper, case 2 : cable contaminated with a piece of plastic, case 3 : cable contaminated with grease, case 4 : cable contaminated with a piece of copper, and case 5 : Eccentric conductor cable. With environmental control of the testing process, the test results show the polarization current of the defective contaminated cable with copper is higher than that of the regular one, whereas it is lower than that of the defective one with paper, plastic and grease. It is also found that there was indistinctive of PDC in case of copper contaminated and eccentric conductor cable.
Some of the metrics are blocked by your
consent settings
A lab-scale heliostat positioning control using fuzzy logic based stepper motor drive with micro step and multi-frequency mode
(2017-08-23)
Jirasuwankul, N.
;
Manop, C.
This paper proposes positioning control technique for a lab-scale heliostat by application of hybrid stepper motors and fuzzy logic controllers. Steady state tracking error has been kept minimal by micro step drive together with speed control by multi stepping rate adjustment. By supportive video streaming device and image processing, a reflected image of illuminant area on the target is captured and analyzed, an obtaining position error in azimuth and altitude angles are real-time fed to the fuzzy controllers. As a result, the closed loop tracking is formulated and steady state error can then be minimized. Simulation and experimental results confirm the proposed technique.
Some of the metrics are blocked by your
consent settings
Simulation of Energy Efficiency Improvement in Induction Motor Drive by Fuzzy Logic Based Temperature Compensation
(2017-02-01)
Jirasuwankul, N.
This paper proposes a method of improving efficient energy usage in induction motor drive system when operated under high temperature condition. By confining the drive signal to the prospective domain of that compensated by operating temperature range, an optimum point of driving performance and energy efficiency will be met for the given load torque and speed command. In this study, fuzzy logic has been applied as a temperature compensator and incorporated into the system model in MATLAB-Simulink. Simulation results showed that the system can operate and retain its performance together with efficient utilization of energy under high temperature condition.
Some of the metrics are blocked by your
consent settings
Air-gap power and rotor loss estimation for induction motor efficiency monitoring based on Kalman filtering
(2013-01-01)
Jirasuwankul, N.
;
Manop, C.
This paper presents a technique of induction motor's efficiency monitoring based on air-gap power and rotor loss estimation by Kalman filtering. A simplified model of three phase induction motor, with equivalent circuit of five elements, has been tested by the proposed technique with varying load torque and power to represent practical operations. Good agreement between the simulation and experimental results are found in a normal operating range of load torque and power. © 2013 IEEE.
Some of the metrics are blocked by your
consent settings
Effect of text orientation to OCR error and anti-skew of text using projective transform technique
(2011-10-17)
Jirasuwankul, N.
In this paper, text orientation which affects to OCR output error together with corresponding correction technique was examined. In case of text oriented in 3D or tilted manner, conventional anti-skew technique such as Hough or Radon transform could fail and a technique of Projective transform is proposed. To illustrate the effectiveness of the technique, Arial and OCR-A extended font types had been tested by manipulating in both 2D and 3D orientations. The tested results from MATLAB and OCR freeware showed that OCR accuracy is sensitive to text orientation and the proposed technique can do anti-skew image of text from 2D scene which mapped from 3D object orientation. © 2011 IEEE.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results