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〈학술논문〉Micro textured 표면마찰측정을 위한 저속 마찰시험기의 제작
김범근(Beomkeun Kim),김홍철(Hongchul Kim),김용수(Yongsu Kim),이지행(Gi-Haeng Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The friction is generated among machine parts. As the friction reduces the efficiency of machine parts, many engineers are trying to reduce the friction among machine parts. The technology of surface texture is often used to reduce the friction loss where occurs contacting surfaces. These researchers would adapt the technology of surface texture, used laser processing, to the automobile engine to reduce the friction loss and improve the durability. In this study, friction tester was developed for measuring the friction between a piston ring and a cylinder bore. Actually, the coefficient of friction was measured about a piston ring material and a cylinder bore material by using manufactured tester. According to increase the weight, we found out that coefficient of friction was decreased.
FEA를 이용한 V 벨트풀리의 피로수명해석에서 원심력의 영향
김범근(Beomkeun Kim),김홍철(Hongchul Kim),김용수(Yongsu Kim) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
Fatigue life of a V-belt pulley, which is commonly used in automotive power train to transfer power to other parts, is predicted based on damage analysis by finite element analysis (FEA). Load conditions on pulley are analyzed by considering interactions among the pulley, V belt, bracket and bolts. In order to find out the effect of centrifugal load in FE analysis, two analyses were performed with different condition, one with centrifugal load and the other without. Durability test for the pulley used in the analysis was followed to verify the analysis results.
김범근(Beomkeun Kim),김흥섭(Heungseob Kim),김용수(Yongsu Kim),김홍철(Hongchul Kim) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Mineral/glass reinforced polypropylene compounds, as an alternative engine cover material, offers weight as well as cost reduction. The polypropylene compound’s low strength requires, however, careful consideration of structural failure in the design of the engine cover. In this study, fatigue failure of the mineral/glass reinforced polypropylene compounds engine cover is discussed. In order to predict dynamic behavior of the engine cover, natural frequencies of the system were calculated considering the damping effect of the structure. Extracted natural frequencies were compared with the measured data from experimental modal analysis (EMA). Dynamic time history of the stress distribution in the engine cover under vibration load and assembly load was calculated based on the extracted natural frequencies of the system. Experimental measurements of strains were performed to verify the results of the analysis. Based on the calculated stress data and measured S-N curve for the engine cover material, safety factors of the engine cover were predicted. In order to improve the durability of the engine cover, design modifications of the engine cover were investigated. Durability test results showed close correlation with the analysis data. Study showed that consideration of the assembly load was necessary to predict the fatigue failure of the engine cover system.
FEA를 이용한 V 벨트풀리의 피로수명해석에서 반경 방향 마찰력의 영향
김범근(Beomkeun Kim),김홍철(Hongchul Kim),김용수(Yongsoo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10
Fatigue life of a V-belt pulley, which is commonly used in automotive power train to transfer power to other parts, is predicted based on damage analysis by finite element analysis (FEA). Load conditions on pulley are analyzed by considering interactions among the pulley, V belt, bracket and bolts. In order to find out the effect of friction force in radial direction in FE analysis, two analyses were performed with different contact load condition, one with consideration of friction in radial direction and the other without. Durability test for the pulley used in the analysis was followed to verify the analysis results.
재질의 비선형 특성을 고려한 엔진 복합 구조물의 내구성능 평가
김범근(Beomkeun Kim),김용수(Yongsu Kim),김홍철(Hongchul Kim),이용희(Yonghee Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Recently, the automotive industry has been trying to reduce the weight of vehicles to improve the fuel efficiency and comply with stricter environmental regulations. It is important not only to reduce weight but also to maintain durability of the original product. Durability problems of the engine, which accounts for major portion of the weight of a vehicle, were found out by using CAE(Computer Aided Engineering) method in this study. By using finite element analysis which is one of the CAE methods in this study, durability of the reduced weight engine was estimated after structural analysis was performed. No studies on structural analysis of material properties on temperature changes in the engine have ever been reported to date. In this study, the FE model including the cylinder block and cylinder head with a gasket, head bolts, liners and valve seats was constructed and structural analysis considering plastic deformation was performed using data obtained from material properties test in high temperature. Through the analysis results in assembly, thermal and firing load condition, we predicted stress concentration in the engine assembly. Based on the result of FE analysis, the weak parts of the engine assembly were estimated at the position where bolts are fastened and through the shafts of bolts.