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정낙신(Nakshin Jeong),양민양(Min-Yang Yang) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.3
This paper presents the analytical prediction of stability lobes in milling. The stability lobes are obtained by measuring the frequency response function (FRF) of a machining center at the cutting point of the end mill cutter, identifying cutting constants, and approximating cutting force coefficients. The stability lobes are experimentally verified through cutting tests.
해양플랜트 탑사이드용 고압 볼밸브에 대한 구조 안전성 평가
오정식(Jeong-Sik Oh),김유일(Yooil Kim),정낙신(Nakshin Jeong),김상명(Sangmyung Kim) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.2
A high-pressure ball valve was developed, and both the structural strength and sealing performance were assessed based on a nonlinear finite element analysis. Different parts were modeled with solid elements and assembled, taking into account both contact and sliding effects. Three different loading scenarios were analyzed, including a high-pressure closure test and fire and shell test conditions. The structural safety of each part was checked under each loading condition, and the sealing performance was also investigated to validate the performance of the valve.