http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자기누설을 이용한 구조물 내 철근 유무 판별에 관한 연구
박일환(Il Hwan Park),한재만(Jea Man Han),서강(Kang Seo),박관수(Gwan Soo Park) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
자기누설방식의 비파괴검사법은 자성체 구조물을 자화시켜 결함 구조물에서 단면적의 변화에 따른 자기 누설의 증가를 측정하여 결함 정도와 크기 등을 측정하는 비파괴검사법이다. 본 논문에서는 특히 구조물 내의 철근을 모델링하여 유한요소해석 결과와 자기누설 비파괴검사법을 이용한 측정 데이터를 비교해 보았다.
방전현상 해석을 위한 전자장 및 전하이동 방정식의 비선형 결합 알고리즘
박일환(Il-Han Park),이세연(Se-Yeon Lee),이세희(Se-Hee Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
A complete finite element analysis method for discharge onset process, which is governed and coupled by charge transport equation and electric field equation, was presented. The charge transport equation of first order was transformed into a second-order one by utilizing the artificial diffusion scheme. The two second-order equations were analyzed by the finite element formulation which is well-developed for second-order ones. The Fowler-Nordheim injection boundary condition was adopted for charge transport equation. After verifying the numerical results by comparing to the analytic solutions using parallel plane electrodes with one carrier system, we extended the result to blade-plane electrodes in 20 xy geometry with three carriers system. Radius of the sharp tip was taken to be 50 ㎛. When this sharp geometry was solved by utilizing the space discretizing methods, the very sharp tip was found to cause a singularity in electric field and space charge distribution around the tip. To avoid these numerical difficulties in the FEM, finer meshes, a higher order shape function, and artificial diffusion scheme were employed.