http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 전부일(Boo-Il Jeon) (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
이민우,배재성,이수용,이석준,전부일,Lee, Min-Woo,Bae, Jae-Sung,Lee, Soo-Yong,Lee, Seok-Joon,Jeon, Boo-Il 항공우주시스템공학회 2008 항공우주시스템공학회지 Vol.2 No.1
The three-dimensional finite element modeling of a composite rotor blade is very hard and requires much computation effort. The efficient method to model a composite beam is necessary for the dynamic and aeroelastic analyses of rotor blades. In this study, the beam modeling method of a composite rotor blade is studied using VABS. The computer program, VABS (Variational Asymptotic Beam Section Analysis), uses the variational asymptotic method to split a 3-D nonlinear elasticity problem into 2-D cross-sectional analysis and 1-D nonlinear beam problem. The VABS can produce the sectional stiffness coefficients of composite rotor blades with various cross section and initial twist/curvatures, and recover the original 3-D distribution of displacement/strain/stress fields. The results of various cross section beams show that VABS gives us the accurate results comparared to commercial codes and does not need much computation effort. It can be concluded that VABS provides the efficient method to establish the FE model of a composite rotor blade.
-
이현철(Hyun-Cheol Lee),전부일(Boo-Il Jeon),문장수(Jang-Soo Moon),이석준(Seok-June Yee) 한국항공우주학회 2009 韓國航空宇宙學會誌 Vol.37 No.2
본 연구의 목적은 주로터 블레이드와 장애물 충돌 시 실제 파괴형상과 유사한 시뮬레이션을 통해 발생되는 하중을 구하고, 이것을 이용하여 허브 및 변속장치의 안전성을 검토함으로써 승무원의 안전성을 확보하는 것이다. 헬리콥터의 실제 운용 시에 주로터 복합재 블레이드 바깥쪽 10% 지점에 직경 203㎜의 강체실린더가 충돌할 경우에도 주로터 주축은 파괴가 발생하지 않아야 하고 변속장치가 탑승공간으로 침투하는 위험한 변위가 발생하지 않아야 한다. 강체와 블레이드 충돌 시 주로터의 주축과 변속장치의 영향성을 확인하기 위하여 탄소성 손상 재질을 사용하여 복합재 블레이드와 나무(강체실린더의 경우는 강체)의 해석모델을 구성하였으며, 파괴진행과정을 실제와 유사하게 구현하기 위해 여러 개의 접촉면을 생성하여 충돌해석을 수행하였고, 구형베어링 및 리드래그댐퍼에 전달되는 하중을 구하였다 또한, 블레이드 회전속도 및 피치각도의 변화가 전달하중에 미치는 영향을 검토하였다. The objective of this study is ensuring safety of cabin when the blade impacts into a obstacle by verifying safety of the rotor mast and the transmission using impact loads calculated from the simulation. The rotor mast shall not fail and the transmission shall not be displaced into occupiable space when the main rotor composite blade impact into a 8 inch rigid cylinder in diameter on the outer 10% of the blade at operational rotor speed. To calculate the reaction loads at the spherical bearing and lead-lag damper, blade impact analysis was performed with FE model consist of composite blade, tree(or rigid cylinder) using elastic-plastic with damage material and several contact surfaces which were created to describe a progress of actual failure. Also, the reaction loads were investigated in change of blade rotation speed and pitch angle.
-
한국형 기동헬기 꼬리 날개 디페인팅 현상을 통한 도장 품질 향상에 관한 연구
장인기 ( In Ki Chang ),김영진 ( Young Jin Kim ),서현수 ( Hyun Soo Seo ),전부일 ( Boo Il Jeon ) 한국품질경영학회 2014 품질경영학회지 Vol.42 No.3
Purpose: The purpose of this study was to explain de-painting phenomenon of KUH-1 tail blade and to propose useful solution of it by test. The proposed solution was evaluated by real flight, and then it applied to mass product to improve the paint qual ity of KUH-1 tail bl ade. Methods: This study investigated an adhesive ability of primer following surface sanding condition. The cross cut and scratch test were conducted to evaluate the adhesive strength. And the water flow test was designed to simulate a real flight condition under rain. Through water flow test, an optimal condition of tail blade to prevent a de-painting phenomenon was deduced. Finally, the improvement method was evaluated by real flight under rain. Results: The results of this study are as follows; The sequential polishing was most excellent method in primer painting quality. The results of test including cross cut, scratch and water flow showed that MIL-DTL-53039 paint with epoxy primer has excellent adhesive ability. To proof the effect of improvement, a real flight during a rain condition was conducted. Finally, the comparison between original and improved configuration was conducted. Conclusion: The painting quality of KUH-1 tail blade was improved through deriving an optimal painting condition. In detail, a condition of optimal sanding and a sort of primer and paint was showed. Finally, the reliability of tail blade was guaranteed through improving the quality of painting.
-
境界 要素法을 利用한 2次元 彈性體의 形狀 最適設計에 관한 硏究
전부일,우호길 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.2
The development and application to the shape optimization of two-dimensional elastic body are presented. Boundary element method is used in this study to avoid the regridding process to account for shape charge. Feasible direction method is used as optimization technique and Finite difference method is used to get design sensitivity in the optimization process. To demonstrate the feasibility of the method proposed, shape optimization of two dimensional dlastic ring under point load is carried out as an example.
ScienceON
DBpia연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
