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가솔린 차량의 각 요소별 연료소모량 분석을 위한 실험적 연구
유정철(Jengcheol Yoo),송해박(Haibak Song),이종화(Jonghwa Lee),유재석(Jaisuk Yoo),박영무(Youngmoo Park),박경석(Kyungseok Park) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.1
A vehicle fuel economy is one of the most important issues in view of environmental regulation and customer's needs. In order to improve the vehicle fuel economy, great efforts has been carried out on the components bases. However, systematic analysis of vehicle fuel consumption is necessary for the further improvement of vehicle fuel economy. In this paper, a methodology for the breakdown of vehicle fuel consumption was studied and proposed for systematic analysis of the vehicle fuel economy. The energy equation for the vehicle power train was set up for the analysis of the vehicle fuel economy and simplified to be calculated or estimated using the measured data in a vehicle. The amount of fuel that was used in vehicle components under arbitrary driving conditions was quantified.<br/>
가솔린 차량의 각 요소별 연료소모량 분석을 위한 실험적 연구
유정철(Jengcheol Yoo),송해박(Haibak Song),박경석(Kyungseok Park),유재석(Jaisuk Yoo),박영무(Youngmoo Park),이종화(Jonghwa Lee) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
A vehicle fuel economy is one of the most important issues in view of environmental regulation and customer’s<br/> needs. In order to improve the vehicle fuel economy, great efforts has been carried out on the components bases .<br/> However, systematic analysis of vehicle fuel consumption is necessary for the further improvement of vehicle fuel<br/> economy. In this paper, a methodology for the breakdown of vehicle fuel consumption was studied and proposed for<br/> systematic analysis of the vehicle fuel economy. The energy equation for the vehicle power train was set up for the<br/> analysis of the vehicle fuel economy and simplified to be calculated or estimated using the measured data in a<br/> vehicle. The amount of fuel that was used in vehicle components under arbitrary driving conditions was quantified.
대류확산문제의 유한요소해석을 위한 Line-by-Line 해법
유재석,Yoo, Jaisuk 대한설비공학회 1991 설비공학 논문집 Vol.3 No.2
Finite element method has been developed recently for the solution of the convection-diffusion problems. Finite element method has several advantages over finite difference method, but its requirement of the larger memory size of the computer has prevented from wide application. In the present study, line-by-line technique has been implemented to finite element method to overcome this disadvantage. Two dimensional laminar natural convection in square cavity was chosen as an example in this study. The numerical result shows good agreement with bench mark solution and the size of the coefficient marix has been reduced drastically.
Pilsoo Jeon,Kwangjai Lee,Jaisuk Yoo,Youngmoo Park,Jonghwa Lee 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.10
A method of measuring the thermal diffusivity of semi-infinite solid material at room temperature using photothermal displacement is proposed. In previous works, within the constant thickness of material, the thermal diffusivity was determined by the magnitude and phase of deformation gradient as the relative position between the pump and probe beams. In this study, however, a complete theoretical treatment of the photothermal displacement technique has been performed for thermal diffusivity measurement in semi-infinite solid materials. The influence of parameters, such as, radius and modulation frequency of the pump beam and the thermal diffusivity, was studied. We propose a simple analysis method based on the zero -crossing position of real part of deformation gradient and the minimum position of phase as the relative position between two beams. It is independent of parameters such as power of pump beam, absorption coefficient, reflectivity, Poisson's ratio, and thermal expansion coefficient.
Jeon, PiIsoo,Lee, Kwangjai,Yoo, Jaisuk,Park, Youngmoo,Lee, Jonghwa The Korean Society of Mechanical Engineers 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.10
A method of measuring the thermal diffusivity of semi-infinite solid material at room temperature using photothermal displacement is proposed. In previous works, within the constant thickness of material, the thermal diffusivity was determined by the magnitude and phase of deformation gradient as the relative position between the pump and probe beams. In this study, however, a complete theoretical treatment of the photothermal displacement technique has been performed for thermal diffusivity measurement in semi-infinite solid materials. The influence of parameters, such as, radius and modulation frequency of the pump beam and the thermal diffusivity, was studied. We propose a simple analysis method based on the zero -crossing position of real part of deformation gradient and the minimum position of phase as the relative position between two beams. It is independent of parameters such as power of pump beam, absorption coefficient, reflectivity, Poisson's ratio, and thermal expansion coefficient.
Pilsoo Jeon,Kwangjai Lee,Jaisuk Yoo,Youngmoo Park,Jonghwa Lee 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.12
As technology advances with development of new materials, it is important to measure the thermal diffusivity of material and to predict the heat transfer in the solid subject to thermal processes. The measurement of thermal properties can be done in a non-contact way using photothermal displacement spectroscopy. In this work, the thermal diffusivity was measured by analyzing the magnitude and phase of deformation gradient. We proposed a new data analysis method based on the real part of deformation gradient as the pump-probe offset value. As the result, compared with the literature value, the measured thermal diffusivities of materials showed about 3% error.