Depaiwa, Nattawoot
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Depaiwa, Nattawoot
Alternative Name
Depaiwa, N.
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Email
nattawoot.de@kmitl.ac.th
12 results
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Item type:Publication, Impact of Driving Behavior on Power Consumption of Electric Bus: A Case Study on Rama IX Bridge(2022-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Active Vibration Absorber with Curved Beam Design(2023-01-01); The project aims to design and create an active vibration absorber with a curved beam to reduce vibration. The selected frequency of the vibration generator for this research was limited to 10 to 30 revolutions per minute and is forced to move in one dimension. The vibration generator was controlled by variable resistance with an unbalanced mass that produces centrifugal forces between 14.799 and 133.189 newtons at frequencies of 10 and 30 revolutions per minute, respectively. To control the natural frequency of the active vibration absorber, the microcontroller STM32F103C8T6-Black Pill and absorption frequency was used with a set of controlling criteria that help to adjust a spring's stiffness. The spring was designed as a curve beam so that the absorber would be small and easy to use while having a wider working range and reacting quicker to a change in load. To reduce system vibration, the spring stiffness was properly adjusted by changing the curve beam's length by changing the locker arm's position using a rotating motor. The feedback control system, meanwhile, was used to adjust the motor's position through variable resistance and then calculate a feedback error to the corrected position, resulting in a natural frequency of the absorber that was similar to the system's vibration frequency. Moreover, the relationship between spring stiffness and curve beam length was also investigated to obtain the function of locker arm position and specify the angle of the motor's shaft. Experiments to test the correctness of theory and method were also conducted. Prior to the experiment, the vibration absorber's efficiency was assessed using ADAMS motion simulation software. The efficiency as a percentage drop in the main system vibration amplitude was calculated while the vibration absorber was mounted. At an operating frequency of 15 Hz, which is close to the natural frequency of the main system, the test results show that the vibration can be reduced by up to 65.49 percent. However, based on the experiment's results, the efficiency was defined as a percentage of a reduction in vibration amplitude in the primary system, both with and without an active absorber. The most efficiency as a percentage drop in the main system vibration amplitude was 34.917%, while the least efficient was 7.711%. It was concluded that the active vibration absorber design with the curved beam can reduce vibration, and while the results were not the best, they were enough to warrant the commencement of future studies. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Development and Design Structure and Mechanism of Sugarcane Harvester with Leaf Pruning Machine(2023-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of ethanol biodiesel blends on a diesel engine's efficiency and exhaust emission characteristics(2022-01-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Adaptive PID for controlling a quadrotor in a virtual outdoor scenario: Simulation study(2013-11-25); The main purpose of this paper is to develop a robust control methodology for unmanned aerial vehicles such as a quadrotor. A conventional proportional-integral-derivative (PID) controller is augmented with adaptive K<inf>P</inf> or non-adaptive K<inf>P</inf> in a throttle input and the both cases are compared and analyzed. Adaptive K<inf>P</inf> is suitable for a system which is subjected to parameter uncertainty, such as variation in payload or wind speed, as the algorithm is able to adjust the K<inf>P</inf> gain of the PID controller so that they maintain robustness and performance. The performance results of the two controllers when applied to a quadrotor are demonstrated using numerical simulation. © 2013 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Investigation of the Impact Bioethanol Blends into Biodiesel on Combustion Characteristics, Engine Performance, and Emissions of Diesel Engine(2022-01-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Tool path planning technique for robot plasma spray coating on duct component(2010-12-01); Yamaura, HiroshiThe internal plasma spray coating process for multisection shapes tubular, which has been applied by multi-axis robot station, is difficult to generate collision-free tool path manually. Robotic software is very helpful to create a tool path. At this point, a plasma flame should be perpendicular to the coating surface and there should be adequate spraying distance, from 3D CAD model. However, the constraints of both shape and size of spray gun and the tubular cause the collision to occur in certain positions on the motion path. The collision between the tubular with robotic parts or any part of the system is strictly prohibited. Therefore, this thesis studies on collision protection system to detect spraying point on the tool path which is the cause of collision. Furthermore, the researchers find tool path adaptation algorithm in order to automatically modify the spraying point to flee from collision. Moreover, the application also retains a spraying condition to keep the coating surface good as well. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Tuning PID controller using genetic algorithms for electro-hydraulic system with tracking force control(2014-01-01); The aim of this paper is design a controller for force control of an Electro-Hydraulic System and selection of a PID gains are using genetic algorithm. The mathematical model is considered as the Newton second law and compressible fluid flow theory. This paper compares two kinds of tuning methods for PID controller. One is the controller design by the genetic algorithm, second is the controller design by the Ziegler and Nichols method. Each PID gains are tested with step input function, square signal, half-sine signal and half-saw signal. And results show performance index with rise time, settling time and Maximum %OS. It was found that the proposed PID gains tuning by the genetic algorithm is better than the Ziegler & Nichols' method. © (2014) Trans Tech Publications, Switzerland. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermal enhancement in a solar air heater channel using rectangular winglet vortex generators(2010-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermal performance in a tubular heat exchanger with deltawinglets(2018-08-14); ; The paper presents an experimental heat transfer enhancement study in a tubular heat exchanger fitted with delta-winglets. The experimental work was conducted by varying the airflow rate in the test tube having a constant wall heat-flux for turbulent regime, Reynolds number (Re) from 5200 to 23,000. Effects of three pitch ratios (PR=P/D=1.5, 2.0 and 3.0) and two attack angles, α = 45° and 60°, of the winglets at a single blockage ratio (BR=b/D = 0.15) on thermal characteristics are examined. The experimental results show that the winglet-inserted tube yields, respectively, the heat transfer, friction factor and thermal performance in the form of TEF around 1.99-4.08, 4.9-14.3 times higher than the plain tube and 0.85-1.85, depending on the operating condition.