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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.
김범근(Beomkeun Kim),김홍섭(Heungseob Kim),김용수(Yongsu Kim),조규철(Gyuchul Cho),정재관(Jaekwan Jeong) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Structural failure by fatigue of automotive engine cover is discussed. Fatigue properties of mineral/glass reinforced polypropylene compounds, as an alternative material for engine cover, were measured by experiments. The use of polypropylene compounds offers weight as well as cost reduction. Finite element analysis (FEA) has been performed to investigate the fatigue behavior of the engine cover. Assembly load due to the tightening of the bolts as well as the vibration load was considered to describe the actual loading conditions in durability test. Natural frequency of the system was extracted considering the damping effect of the structure. Dynamic time history of engine cover under vibration load was calculated based on the extracted natural frequency of the system and stress distributions at each load condition were predicted. Experimental modal analysis (EMA) was performed to identify the modal parameters and measurements of strains were performed to verify the results of the analysis. Based on the S-N curve data for engine cover material, distribution of safety factor was predicted by using the FEanalysis results. The calculated results were verified by experimental durability tests. Analysis results showed that contribution of the assembly load is not negligible to predict the fatigue failure of the engine cove
〈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.
유한 요소 해석을 이용한 HSDI Diesel cylinder head의 내구성 증대
김범근(Beomkeun Kim),장훈(Hoon Chang),이경우(Kyungwoo Lee),김치언(Chieon Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Since HSDI (High Speed Direct Injection) diesel engine operates under highly loaded condition due to increased power output, cylinder head of HSDI diesel engine is susceptible to high cycle fatigue cracks. In this study, FE analysis was used to find the mechanism of high cycle fatigue crack in the HSDI diesel cylinder head. In order to improve the durability of HSDI diesel cylinder head, the modifications of cylinder head, cylinder head gasket and head bolt load were investigated. Experiments were performed to prove the existence of residual stress created during the heat treatment of cylinder head. The results of experiments showed that residual stress can affect the durability of HSDI diesel cylinder head.
Mineral/glass reinforced polypropylene compound 재질 엔진 커버의 피로거동 특성
김범근(Beomkeun Kim),김흥섭(Heungseob Kim),김용수(Yongsu Kim),조규철(Gyuchul Cho),정재관(Jaekwan Jeong) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Structural failure by fatigue of automotive engine cover is discussed. Fatigue properties of mineral/glass reinforced polypropylene compounds, as an alternative material for engine cover, were measured by experiments. The use of polypropylene compounds offers weight as well as cost reduction. Finite element analysis (FEA) has been performed to investigate the fatigue behavior of the engine cover. Assembly load due to the tightening of the bolts as well as the vibration load was considered to describe the actual loading conditions in durability test. Natural frequency of the system was extracted considering the damping effect of the structure. Dynamic time history of engine cover under vibration load was calculated based on the extracted natural frequency of the system and stress distributions at each load condition were predicted. Experimental modal analysis (EMA) was performed to identify the modal parameters and measurements of strains were performed to verify the results of the analysis. Based on the S-N curve data for engine cover material, distribution of safety factor was predicted by using the FEanalysis results. The calculated results were verified by experimental durability tests. Analysis results showed that contribution of the assembly load is not negligible to predict the fatigue failure of the engine cove.
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.
열변형을 고려한 터보디젤 엔진용 배기매니폴드 플랜지의 설계
김범근(Beomkeun Kim),이은현(Eunhyun Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Thermal deformation of cast iron exhaust manifold for turbo diesel engine is investigated by finite element analysis (FEA). The FE model included the temperature dependent material properties as well as the interactions between exhaust manifold, cylinder head and fasteners. It also considers the sliding behavior of the flanges of exhaust manifold on cylinder head when either expansion or contraction of the exhaust manifold exceeds the fastener pretension. The result of analysis revealed that remarkable thermal deformation along the longitudinal direction. Compressive plastic deformation at high temperature remained tensile stress in manifold and resulted in longitudinal contraction at ambient temperature. The amount of contraction at each fastener position was predicted and compared with experimental results. Analysis revealed that the design of bolt holes of flanges, which allows sliding behavior, reduced the plastic strain range and delayed thermal surface crack.