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김철순(Cheolsoon Kim),정길조(Giljo Jung),박진수(Jinsu Park),최종윤(Jongyun Choi),최윤석(Yoonseok Choi) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
Recently, exhaust emission regulation have become more stringent as a result of increased environmental issue and high-fuel-efficient vehicles are needed from customers. As one of the solutions, adoption of idle stop device has been increasing on vehicle. In case of the idle stop device with electric oil pump, it is needed to minimize the time delay by rapidly raising hydraulic pressure. In this study, considering shape of the hydraulic circuit in sub control valve, the method using CFD was developed to improve the hydraulic response for idle stop device with electric oil pump. Through this method, it could predict the location and size of the air pocket, and confirmed that the air pocket cause the delay of hydraulic pressure increase. As a result, it is possible to propose the sub control valve which is minimized the delay of hydraulic pressure.
불순물에 의한 유압저하를 고려한 스트레이너 설계 수법 개발
김철순(Cheolsoon Kim),송호성(Hosung Song),최종윤(Jongyun Choi),박정일(Jungil Park),김민철(Mincheol Kim) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
In the transmission, ATF is supplied to the oil pump through the strainer, and the hydraulic pressure generated from the oil pump is supplied to each component of the transmission through the control valve. The strainer serves to maintain the suction performance of fluid and functions as a filter that captures contamination from the inside of transmission. In order to maintain these two functions, the strainer is designed in consideration of the position of the inlet and the pressure loss generated inside the strainer. Currently, pressure loss after contamination capture depends on experimentation. In this study, we developed a strainer design method that can predict hydraulic pressure drop due to contamination accumulation. The model which improved the inhalation performance of the strainer using this method was proposed and compared with the experiment, the validity was confirmed.
CVT 밸브바디 수지화에 따른 볼트 체결구조에 관한 연구
박종호(Jongho Park),최종윤(Jongyun Choi),김대원(Daewon Kim),김철순(Cheolsoon Kim),코지마 켄지(Kenji Kojima) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Recently, to improve the energy efficiency of automobiles, the importance of weight reduction is increased for vehicle parts. The control valve, which is a mechanism for supplying hydraulic pressure in CVT, is also required to reduce weight. Using plastic is one of the method of weight reduction. The bodies of the control valve are fastened with bolts, and it is necessary to prevent the oil leak while suppressing the deformation of the bore. However, Plastic material has low stiffness, so the design method for aluminum materials cannot be applied in the plastic control valve body. In this study, it was confirmed that the effect of the variables on the fastening force by FE analysis of simple model, and it was verified that required hydraulic performance can be satisfied in the plastic control valve design by experiment.
小規模貯水池에 있어서 물넘이의 設計降雨量算定에 關한 硏究
金哲淳 조선대학교 국토개발연구소 1980 국토개발연구 Vol.2 No.1
In the spillway design of small reservoiers, the outflow of severe rainfall shorter than an hour is a diffisult problem. To calcurate the outflow, two Rainfall Intensity formula may be used. Thet are Exact calaulation method and Specific coefficient method. In this paper, comparing with these two methods, I havw obtained following results. 1) Depending on the Exact calculation method, Japanese type is applied better than other types in logarithmic normalization method and Gumbel-Chow method. 2) Depending on the Exact calculation method, Sherman type is applied better than other types in moment method. 3) The caseⅢ type by the Specific coefficient method is applied better than given data. 4) The calculation of probable Rainfall Intensity by the Specific coefficient method is more simpler than the Exact calculation method. 5) Therefore, Specific coefficient method can be applied to spillway design of the time of concentration shorter than an hour in small reservoiers.