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건축용 타워크레인 마스트의 횡방향 지지요소인 월타이 부재력 특성곡선
고광일,오우훈,이은택,Ko, Kwang IL,Oh, W.H.,Lee, E.T. 한국강구조학회 2006 韓國鋼構造學會 論文集 Vol.18 No.6
Tower crane's wall tie is generally used for extending of mast height according to rising of lifting height. In order to get wall tie member force this problem, this study concerning wall tie is based on load data described in manual book of 290HC model. This study made the equation of wall tie member force and computer programming for calculating wall tie member force and then get ${\theta}-P$ curves(angle-wall tie force). After considering the ${\theta}-P$ curves, optimum angle range ($48.4^{\circ}{\sim}77.2^{\circ}$) about wall ties (A), (C) members was obtained. Member force of wall tie (B) was changed from tension to compression or from compression to tension at $74^{\circ}$ in service and $54^{\circ}$ in out of service. When both horizontal force($H_A$) and torsional moment ($M_D$) were varied from (+) to (-), wall tie force(A, B, C) were changed almost symmetrically about ${\theta}$-axis. Because this study was based on wall tie analysis conditions, wall tie members in symmetric and ideal geometry shape used for analizing wall tie of tower crane, it is necessary to have more careful verification in order to apply generally the results of this study. 타워크레인의 횡방향 지지와 마스트의 횡강성 및 강도를 확보하기 위하여 횡하중 저항요소로서 사용되는 것이 월타이(wall tie)이다. 본 연구에서는 국내에서 가장 많이 사용되고 있는 독일 립헬사의 T형 타워크레인(기종 290HC, 작업반경: 70m, 인양하중: 12tf)을 대상으로 하고 마스트 및 월타이의 사용부재는 H형강보 구조의 구조물을 모델로 선정하여 월타이의 부재력, 월타이의 각도변화 및 각도범위에 따른 부재력의 변화를 분석하여, 실용적이고 안전한 월타이의 각도범위를 제안하여 현장기술자가 최적의 월타이를 배치할 수 있도록 하였다. 본 연구를 통하여 건축용 타워크레인의 훅크양정을 증대시키기 위하여 설치되는 횡방향지지요소인 월타이의 부재력 계산식을 구하고, 이를 프로그래밍하여 마스트 중심과 월타이 브라켓 간 거리를 변화시키면서, 월타이 각도별 월타이 부재력을 반복계산하여 월타이 부재력 특성곡선을 그리고 이를 분석하였다.
비정렬 중첩격자를 이용한 움직이는 물체 주위 유동 해석
남성현(S.H. Nam),이은택(E.T. LEE),안형택(H.T. Ahn) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.11
In this study, the numerical analysis is carried out to study flow around moving body using unstructured overset grid. In order to investigate flow simulation, Navier-Stokes equation for incompressible flow is calculated with unstructured mesh. Unstructured mesh that is flexible to geometry. And overset method is applied to interpolate between cell data of each mesh in overlap region. This method advantage is to avoid remeshing for each different case and compute efficiently relative motion. The results of the present research can be used as basic data for more complex problem (e.g. 3D problem, ship propeller, etc)
HPLC 에 의한 닭 표피중의 Vitamin D3 및 그 유사물질 분석
장윤환(Y . H . Chiang),이은택(E . T . Lee),전진석(J . S . Cheon),이선행(S . H . Lee) 한국축산학회 1990 한국축산학회지 Vol.32 No.5
This study was carried out to analyze the contents of vitamin D₃ and it`s analogues in chicken epidermis. The retention time and calibration curve were obtained through HPLC. The comb, wattle or dorsal epidermis of 57 week-old breeder irradiated by 310 nm UV hight was extracted by 60% ethyl acetate in n-hexane with appropriate amounts of vitamin D3 and it`s analogues, dried under mitrogen, dissolved in 0.5% isopropanol in n-hexane, analyzed by HPLC, and obtained the recoveries of the compounds. 1. The mean retention times of previtamin D₃(PreD₃3), lumisterol₃(L₃), vitamin D₃(D₃), tachysterol₃(T₃) and 7-dehydrocholesterol (7-DHC) were 6.95, 7.65, 8.90, 12.83 and 14.68 min., respectively. 2. The mean recovery of [³H]-7-DHC through HPLC was 88%. 3. The mean recoveries of PreD₃, L₃, D₃, T₃ and 7-DHC through extraction and HPLC analysis were 72, 34, 27, 13 and 90%, respectively.
등기하 변분다중스케일법을 이용한 원주주위 유동해석에서 압력 경계조건 영향
이은택(E.T. Lee),안형택(H.T. Ahn) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
Pressure boundary condition effect in Variational multiscale(VMS) simulation of laminar flow around a circular cylinder is presented. Two types of pressure boundary condition is employed, firstly, zero-mean-pressure condition with neumann-type pressure boundary condition, and secondly more traditional traction free boundary condition. The effect of two different boundary conditions are compared using vortex-shedding around a circular cylinder. Variational multisclae(VMS) formulation is employed for simulating flows around a circular cylinder. Isogeometric analysis(lGA) techinque, an enhanced finite element method using the quadratic NURBS basis functions, is employed for the exact representation of the circular geometry of the cylinder as well as higher order (>2nd) and C1 continuous approximation of the solution.
이은택,Lee, E.T. 한국강구조학회 2001 韓國鋼構造學會 論文集 Vol.13 No.5
Darwin의 식을 근거로 하여 9개의 유공 H-형강 보의 소성영역에서의 반복 거동을 알아보았다. 이 실험을 통하여 기존의 식, 소성힌지의 효과 개구부 주위의 크랙 발생 및 파단 이후의 소겅거동을 연구하고자 한다. 이 실험의 변수는 개구부 치수, 개구부의 위치 및 갯수, 개구부간의 거리이다. 본 실험을 통하여 국부좌굴이나 개구부의 균열 발생 이후 5~10 사이클에서의 유공보의 내력은 각 실험체 최대내력의 50% 내외로 감소하는 양상을 보였고, 이러한 현상은 일반 H-형강 보의 국부좌굴 후 내력저하와 비교하여 매우 심각한 것으로 나타났다. 따라서 지진하중과 가튼 소성 반복하중에 대한 폭-두께비의 고려나 보강재의 사용 등이 검토되어야 한다. A total of nine H-shaped beams with web openings under cyclic loading condition were investigated. The dimension criteria are based on the formulae proposed by Darwin. The suitability of existing design formulae the effects of plastic hinge on beams with web openings the fracture around the web openings and the influence of cracks neighboring web openings to the beam strength under cyclic loading were also investigated through the observation of the behavior of these beams with various opening dimensions. locations numbers and spacing between the two openings.