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Fuzzy Logic based on LabVIEW for Speed Control of Two-Inertia System
Sakda Prommeuan,Sitchai Boonpiyathud,Tianchai Suksri 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper introduce the speed control of two-inertia system by fuzzy logic controller. The design of a controller is designed and implemented on Laboratory Virtual Instrument Engineering Workbench (LabVIEW) program. The control and measurement system can be display on the monitor directly. The Fuzzy controller consists components it the triangular membership function to input and output to use five linguistic variable defuzzification is center of gravity method and inference is max-min method Rule base evaluation seventeen rule. The experimental results show that the proposed controller can control the speed of two-inertia system constant, without overshoot and steady-state error. The torsional resonance reduction can also be achieved.
Sakda Thongchai,임옥택 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.4
This research investigates the spray characteristics of gasoline-biodiesel blended fuels (GB), which expected to be utilized in a gasoline compression ignition engine. Commercial gasoline blended with 0 ~20 % by volume of biodiesel, called GB00 - GB20, were used to experiment. In addition, neat biodiesel and pure gasoline were also investigated as the references. Firstly, the chemical and physical properties of the GB blends were characterized to clarify the effect of biodiesel content. Then, spray macroscopic visualization was performed by the shadowgraph technique. The test fuels at injection pressures of 1,000, 1,200, and 1,350 bar were injected into a constant volume combustion chamber (CVCC). The constant back pressures in the CVCC were set at 30 bar and 50 bar. The spray penetrating length and cone angle were analyzed by an image processing technique. Biodiesel is characterized as the widest angle and longest spray length while gasoline has the narrowest cone angle and shortest penetration. There is no correlation between the spray angle/penetration length and the percentage of biodiesel in the blends among the GB. When the injection pressure was increased, the spray cone angle was slightly decreased, while the spray-penetrating length was increased for all test fuels.
An Investigation on the Spray Characteristics of a 800KPa CNG port injector
( Sakda Thongchai ),( Ocktaeck Lim ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
This paper investigated the spray characteristics of a 800 kPa CNG port injector which was developed in the domestic Korea. The CNG port injector with multi-holes, employed in this experiment, was designed to inject CNG at high pressure of 800 kPa. The spray macroscopic visualization test was carried out via Schlieren photography to study fuel-air mixing process. The distributed behaviors of gas fuel were necessary for understanding and optimization in order to increase combustion efficiency and decrease exhaust gas emission in SI engine. The fundamental spray characteristics, such as spray penetration, spray cone angle and spray velocity, were evaluated in the constant volume combustion chamber (CVCC) with varying the constant back pressure in CVCC from 0 to 5 bar. For the safety reason, nitrogen (N<sub>2</sub>) and an acetone tracer were utilized as a surrogate gas fuel instead of CNG. The surrogate gas fuel pressures were controlled at 3, 5.5 and 8 bar and injected durations were set at 1 ms throughout the experiment. The simulating events of the low engine speed were arranged at 1,000 rpm. The spray images were recorded by using a high speed video camera with frame rate of 10,000 f/s at 256 x 256 pixels. The spray characteristics were analyzed by using the image processing (Matlab). Moreover, the conventional CNG injector was also evaluated as a reference. The results showed significantly difference that higher injection pressure had more effect on the spray shape than the lower injection pressure. When the injection pressure was increased, the longer pray penetration was occurred. Moreover, the linear relation between speed and time are dependent on the injection pressure as well.