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3차원 자유곡면 가공에 있어서의 공구간섭방지에 관한 연구
양균의,박윤섭,이희관 대한기계학회 1995 대한기계학회논문집 Vol.19 No.8
Tool interference is one of the most critical problems in sculptured surface machining. When machining cavities and concaves, the tool frequently overcuts the portions of the surface, which cause inaccuracy in machining. So tool interference-free paths must be generated for rough cutting more efficiently. In this paper a software using SSI(Surface/Surface intersection) algorithm is developed for eliminating tool interference which occurs in an offset surface in 3-dimensional free form surface modeling. this work consists of two stages : using the offset data, the intersection curves are rapidly checked by this algorithm at the first stage. CL(cutter location) data are obtained by deleting the loop section of intersected offset patches at the second stage. This algorithm can reduce the amount of memory required to store machining data and also easily check region which have the possibility of intersection. Also, This software is verified to be useful in machining a curved object on a DNC milling machine.
3 차원 입자와법을 이용한 높은 스트롤수로 진동하는 구에 대한 유동장의 수치해석
이상환(Sang Hwan Lee),박윤섭(Yun Sub Park),조영택(Young-Taek Cho),안철오(Cheol-O Ahn),서인수(In Soo Seo) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.6
In this paper, we investigated the flow of an incompressible viscous fluid past a sphere which is oscillated one-dimensionally over flow regimes including laminar flow at Reynolds number of 100, 200 and Strouhal number of up to 5000. In order to analyze flow and estimate critical Strouhal number, we introduce threedimensional vortex element method. With this method, separation only appears in decreasing velocity region during the high Strouhal numbers. We find out that vorticity distribution around sphere is proportionl to the Strouhal number. And we can decide that low Strouhal number is below 100, high Strouhal number is above 500 from many results. Thus the critical Strouhal number(St) effected to the flow field is expected to be 100<St<500.
에너지 평가 프로그램을 이용한 공동주택 부대시설 설계사례
홍구표(Goo-Pyo Hong),박철용(Cheol Yong Park),박윤섭(Yoon Sup Park) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Energy consumption of building is very hot topic recently. It becomes more and more important to look for efficient ways of energy consumptoion. It is selected a community center to low energy design. The project uses eQuest, a simulation software tool, for evaluating building energy. First it is evaluated the design to comply with the code, Second the usual design as ALT-1. They are compared the monthly load components and studied what's components affected. Accordingly, the performance of insulation and window system is improvement and photovolatic power generation systems are installed. That is the low energy design as ALT-2. Heating energy consumption is reduced 57%, Cooling energy consumption is reudced 24% through the case study as ALT-2.