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이정준(J. J. Lee),주병현(B. H. Joo),이병채(B. C. Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Generally, in case the natural frequency of vehicle components is larger than the reversing frequency of load history, we can obtain the analysis results with small errors. But in case of having the low natural frequency, we must avoidably carry out the dynamic analysis, and it requires much time and storage. Specially executing the fatigue analysis for vehicle components requires more time. To this end, it is not easy that we accomplish the optimization considering fatigue for the vehicle component based on the dynamic analysis. In this research we introduce an efficient method which performs the fatigue analysis based on the dynamic analysis. Finally as making the response surface we optimize the vehicle component under dynamic fatigue.
광도플러단층촬영장치를 이용한 생체내 혈류 유동가시화에 관한 연구
남후중(H.J. Nam),심명권(M.G. Sim),이정준(J.J. Lee),타치아흐메드쳄마(T.A. Cheema),박철우(C.W. Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Blood flow visualization and velocity field measurement are very difficult to be carried out in vivo compared to those of normal fluid flow measurement although they can employ viewing scope and tracer. In this study, we employ optical Doppler tomography (ODT) to visualize the blood vessels of chicken embryo, so that it can lead to yield much reliable data compared to other methods in vivo.
고승기(Koh S.K),이정준(Lee J.J.) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Fatigue lifetime of a breech system was estimated in order to ensure the structural integrity of the breech system used for a thick-walled tube subjected to pulsating high internal pressure. A stress analysis of the breech was performed to locate the critical region vulnerable to crack initiation. Low-cycle fatigue behavior of the breech material was investigated to obtain the fatigue crack initiation properties. Elastic-plastic finite element stress analysis resulted in a stress concentration at the breech ring groove root. Local strains at the groove root was experimentally measured using strain gages and resulted in similar values compared to the calculated strains. Local strain approach was employed to estimate the fatigue life of the breech system, resulting in 9,124 cycle for crack initiation at the groove root of the breech ring. Fatigue test using simulation specimens was performed and an average fatigue life of 10,497 cycle was obtained, which was fairly close to the calculated fatigue life.