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김재기,심상학 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6
This paper reports by simple method that is quickly corrected the effects of fluid temperature for the hot wire anemometer. We are concerned with a variable output of hot wire anemometer on arbitrary fluid temperature. Hot wire by measuring boundary layer of turbulent flow has been calibrated by arbitrary temperature lower than 100℃, and velocity lower than 20m/s. As a result, we could pick up the temperature factor affected by output of hot wire anemometer from related in output of arbitrary temperature to output of room temperature. By using temperature factor on the output of hot wire anemometer, we also obtained that the relationship of velocity was of no effect by temperature of fluids. About results of calibrated hot wire, uncertainly of velocity is 2.15% at room temperature and 3.1% at arbitrary temperature.
LPG 액상 직접분사용 고압펌프 개발을 위한 기초 연구
박세호(Se-ho Park),심상학(Sang Hak Shim),이병호(Byung Ho Lee),박상욱(Sang Wook Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For the first step of developing a high pressure fuel pump of LPDI Engine, the test bench was made out of parts from GDI (Gasoline Direct Injection) system to perform a basic experiment. Both gasoline and LPG were tested and compared. For the low pressure pump in LPG tank, an existing low pressure pump for LPG MPI System was used. For the high pressure pump, Single plunger type pump and 3-cylinder radial piston pump were tested. As a result, the flow rate of both high pressure pumps were unstable and decreasing because the density of LPG was lower than Gasoline. Especially, single plunger type pump had lower flow rate than 3-cylinder radial piston pump and unstable flow rate when fuel injecting. For the development of an LPDI high pressure pump, it was believed that characteristics (low density and low viscosity compared to gasoline) were critical.<br/>
박형종(Hyoung Jong Park),심상학(Sang Hak Shim),이병호(Byung Ho Lee),박상욱(Sang Wok Park),손창현(Chang hyun Son) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The computational studies conducted to design the shut-off valve in the LPI (Liquid Propane Injection) system. The commercial package ANSYS was utilized to calculate the fuel flow rate in the shut-off valve for various configurations. The LPI system is a new type of fuel supplying system. It is injecting LPG the manifold as a liquid phase. LPI system must supply the required level of fuel flow rate to engine and this fuel rate depends on the geometry of flow passage in the shut-off valve. The calculated results are in good agreement with the experimental data. The final geometry of flow passage that has been concluded does supply required fuel flow rate.<br/>
가변 흡기 밸브 개도의 선형 제어를 위한 엑츄에이터 개발에 관한 연구
전성민(Seong Min Jeon),심상학(Sang Hak Shim),임재규(Jae Kyu Yim),전완재(Wan Jae Jeon),최정령(Jung Lyung Choi) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A Variable intake system is used to boost low to medium speed torque without any drawback in fuel consumption or high speed power, thus improve flexibility of the engine. An ordinary fixed intake manifo1d has its geometry optimized for high speed power, or low torque, or a compromise between them. The variable intake system improves power of an engine with variable intake valve, which is operated by an actuator, according to engine's speed. However, the on/off type actuators, such as vacuum type and motor type, are not good enough to improve power of an engine in a whole period of speed. In this study, the variable intake valve actuator with a built-in Electric drive board and Non-contact type angle position sensor was developed and tested. The goal was to develop the actuator controlled by PWM(Pulse Width Modulation) method, making linear control possible according to the PWM input signal from an ECU.
DC 모터를 이용한 가변 흡기 밸브 구동용 엑츄에이터 개발에 관한 연구
전성민(Seong Min Jeon),심상학(Sang Hak Shim),이병호(Byung Ho Lee),박상욱(Sang Wook Park),박형종(Hyoung jong Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A Variable intake system is getting more popular since the mid-90s. It is used to boost low to medium speed torque without any drawback in fuel consumption or high speed power, thus improve flexibility of the engine. An ordinary fixed intake manifold has its geometry optimized for high speed power, or low torque, or a compromise between them. The variable intake system improves power of an engine with variable intake valve, which is operated by an actuator, according to engine's speed. However, the on/off type actuators, such as vacuum type and motor type, are not good enough to improve power of an engine in a whole period of speed. In this study, the variable intake valve actuator with a built-in Angle position sensor was developed and tested. The goal was to develop the actuator controled by PWM(Pulse Width Modulation) method, making linear control possible according to the engine's speed.<br/>
이준혁(Lee, Jun-Hyuk),임태호(Lim, Tae-Hoo),김경남(Kim, Kyung-Nam),심상학(Shim, Sang-Hak) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
This paper shows the Development of In-tank pressure regulator and Solenoid Valve used in FCV(Fuel Cell Vehicle). We have developed new type of Regulator and Solenoid through analysis of the structure and characteristics of component of FCS(Fuel Cell System) from the advanced technology. Now it is possible to localize the component by making use of the development of Regulator and Solenoid made by us. Regulator and Solenoid is a equipment to control hydrogen pressure supplied into a stack. Therefore, outlet pressure, a flow of fluid and temperature are important parameters according to a inlet pressure. And leak test, endurance test and burst test should be done to guarantee the performance and safety of Regulator and Solenoid used in the fuel of high pressure. Also, Hydrogen friendly materials are applied to inner parts of the Regulator, Solenoid and weight reduction is done to cost saving in part not related to performance. As a result, we have proven the good performance and reliability in endurance of Regulator, Solenoid and will make an development in performance as well as durability to ensure industrialization.