http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
[차량운동성능부문] 상태변수/노면입력 관측기를 이용한 반능동 현가시스템 제어
김정헌(J.H.Kim),이경수(K.S.Yi) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with an observer-based preview control for semi-active suspensions. An Observer has been designed such that all the state variables and road inputs can be estimated from accelerations<br/> Since the road input to the rear wheels is a delayed version of that to the front wheels. it can be obtained by estimating of the road input to the front wheels without preview sensors. The performance of LQ optimal control and the wheelbase preview control using the estimated values of state and the estimated road input has been investigated. The results show that the observer-based control can provide good performance. The observer-based preview control improves the dynamic behavior of the rear axle and that of pitch motion compared to the LQ optimal control.
김정헌(J . H . Kim),김승규(S . G . Kim),배충식(C . C . Bae),신동현(D . H . Sheen) 한국분무공학회 2001 한국액체미립화학회지 Vol.6 No.1
Liquid fossil fuel contaminated by water can cause trouble in the combustion processes and affect the endurance of a combustion system. Using an optical sensor to monitor the water content instantaneously in a fuel pipeline is an effective means of controlling the fuel quality in a combustion system. In two component liquid flows of oil and water, the flow pattern and characteristics of water droplets are changed with various flow conditions. Additionally, the light scattering of the optical sensor measuring the water content is also dependent on the flow patterns and droplet characteristics. Therefore, it is important to investigate the detailed behavior of water droplets in the pipeline of the fuel transportation system. In this study, the flow patterns and characteristics of water droplets in the turbulent pipe flow of two component liquids of gasoline and water were investigated using optical measurements. The dispersion of water droplets in the gasoline flow was visualized, and the size and velocity distributions of water droplets were simultaneously measured by the phase Doppler technique. The Reynolds number of the gasoline pipe flow varied in the range of 4 × 10⁴ to × 10^5, and the water content varied in the range of 50 ppm to 300 ppm. The water droplets were spherical and dispersed homogeneously in all variables of this experiment. The velocity of water droplets was not dependent on the droplet size and the mean velocity of droplets was equal to that of the gasoline flow. The mean diameter of water droplets decreased and the number density increased with the Reynolds number of the gasoline flow.
이창식(C.S.Lee),김정헌(J.H.Kim) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with the results of injection characteristics and the influence parameters upon the fuel injection performance of the inline injection system in a diesel engine. In this study, the characteristics of the injection rate, the injection pressure and the injection duration have been investigated by changing the injection parameters. The predicted results and injection performance are compared to the measured data from the injection test system.<br/> <br/>
지질의 선택적 추출을 위한 SFE 와 MASE 공정 평가
김원일,홍인권,이승범,김정헌 한국공업화학회 2000 응용화학 Vol.4 No.1
The rice bran and amaranth contains various fatty acid, and squalene etc. In this study, the oil including unsaturated fatty acid was extracted from rice bran and amaranth using SFE and MASE, and extracted oil was analysed with GC-MSD. Extraction pressure was from 2000 to 4000 psi, temperature was 40, 50, 70℃, respectively. Total extraction time was 5 hr, extract amount was measured each 1 hr. Extracted amount of rice bran oil, 50℃ should be more suitable for extraction. At constant temperature, it took a short time to extract total amount of extracted oil at high pressure. In case of squalene which was only extracted in SFE as the reduced density was increased, extracted amount of squalene was decreased. Amounts and compositions of extracted fatty acid of amaranth were different with those of each conditions, and the amount of condition at 70℃ and 4000 psi was the most extracted, 1.016g. And a rapid and effective extraction, microwave-extraction, was preformed at the temperature of 40℃ and 50℃, respectively.