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김준엽(Juneyeop Kim),김진규(Jinkyu Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The trend of manufacturing engine support bracket which connect engine to body integrated with chain cover, is growing to reduce the vehicle weight. During the development of chain cover integrated engine support, there were durability problems near the mounting hardware. With the road load data acquisition, the cause of fracture was found. Mounting bolts axial force was decreased during the durability test which means mounting bolts looseness, and it was related with the longitudinal forces which is transverse load for bolt. By laboratory component test, it was found that the looseness of bolts make local strain increased and it leads to crack and the phenomenon of looseness was simulated. With more case studies, proper tightening torque is proposed and design effect was reviewed.
코일 스프링 장착각이 스프링의 내구성능에 미치는 영향에 관한 연구
김영호(Youngho Kim),김준엽(Juneyeop Kim),김준(June Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The reliability of coil spring durability performance is the one of the most important things related with vehicle safety. Recently, the problems related to spring have been occurred sometimes during full vehicle durability test, not component test. However it is difficult to find the improving solutions because of lack of known about the cause and mechanism exactly. Without knowing about them, the changing materials or increasing diameter of spring might become only option choice because they increase cost and time in the development vehicle procedure So the understanding of the cause and mechanism of spring failure is needed. In this paper several straingages were installed on the rear spring to investigate the deformed shape and stress distribution of spring. The measurements on deformed shape and stress were performed in both state of component and full vehicle test with variable conditions of installing spring angle. Through the analysis of the measurement data the optimum installing angle of spring was determined and then it was verified in full vehicle durability test. In a result it was confirmed that the regulation of spring installing angle was effective to improve the durability performance of spring.
연료탱크 에셈블리 진동내구 시험과 실차내구 상관성 개선 연구
김영호(Youngho Kim),김준엽(Juneyeop Kim),성대운(Daewoon Sung),백준현(Junhyun Baek) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The reliability of component test is one of the most important things in process of vehicle development. Especially, in aspect of reducing cost and time, the component test correlated with PG(Proving Ground) make it more efficient the vehicle development. So, it is getting more demanded to develop the new component test method correlated with PG lately. In resent year, a various of problems related to fuel tank assembly have occurred during full vehicle durability test in PG, not component test. The reason is that the existing component test method for fuel tank assembly is a restrict test method without PG correlation and not including the vibration characteristic of fuel tank assembly. So, the need to develop the more efficient component test method for fuel tank assembly is demanded. In this paper, A new test method for fuel tank assembly based on Measured Vehicle Load Data is proposed using random PSD profile. This paper also shows that this new test method is the more improved test in contradistinction to the existing one by making validate test for fuel tank of prototype.