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집중질량 변화에 따른 수중 고속 운동체의 구조 안정성 해석
오경원(Kyung-Won Oh),서주노(Joo-No Sur),조병구(Byung-Gu Cho),류시웅(Si-Ung Ryu),공창덕(Gong-Duk Kong) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.1
In this paper, the effect of the position and size of a lumped mass on the structural stability of a high speed underwater vehicle is presented. For simplicity, a real vehicle was modeled as a follower force subjected beam that was resting on an elastic foundation, and the lumped mass effect was simplified as an elastic intermediate support. The stability of the simplified model was numerically analyzed based on the Finite element method (FEM). This numerical simulation revealed that flutter type instability or divergence type instability occurs, depending on the position and stiffness of the elastic intermediate support, which implies that the instability of the real model is affected by the position and size of the lumped mass.
틸팅열차(TTX) 차체 구조용 샌드위치 복합소재의 단열 특성평가
오경원(Kyung-won Oh),이상진(Sang-jin Lee),정종철(Jong-choel Jeong),김정석(Jeong-seok Kim),조세현(Se-Hyun Cho) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Experimental investigations on heat transportation ratio were firstly performed with three types of sandwich panels such as the Carbon/Epoxy Skin-Aluminum Honeycomb and Balsa Core Sandwich Panel of 37㎜ thickness, the Carbon/Epoxy Aluminum Skin-Honeycomb Core Sandwich Panel of 57㎜ thickness (including insulator) and the Carbon/Epoxy Skin-Aluminum Honeycomb Core Sandwich Panel of 37㎜ thickness based on the KS F 2278:2003(Insulation test method of windows). In additional to this investigation, experimental tests were also done for evaluation of heat transportation ratio with the Aluminum Skin- Aluminium Honeycomb Sandwich Panels of 27㎜ and 35㎜ thickness, and Aluminum Skin-Foaming Aluminum Sandwich Panel of 27㎜ thickness by the KS F2277:2002(Insulation measuring method of construction component - Calibration heat box method or protective heat box method). In this study, it was found that the larger net heat transfer cross sectional area between the skin and the sandwich core is given, the higher heat transportation ratio occurs. And the hybrid type insulation had better insulation characteristics compared to the non-hybrid type insulation.
차체경량화 알루미늄 샌드위치구조용 250°F 에폭시 접착필름 열적 특성 평가
오경원(Oh Kyung-Won),이상진(Lee Sang-Jin),정종철(Jeong Jong-Cheol),조세현(Cho Sea-Hyun),목재균(Mok Jai-Kyun) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
This study was experimental test of edgewise compression properties for aluminum(type-50XX) sandwich panel with thermal environment and surface treatment using adhesive film. There was decreasing 10%-peel strength after thermal environment. Through compressive buckling mode know to seen of properties of adhesive, sheet and core strength. First case of Chromate to aluminum sheet, know low shear strength of adhesive through buckling mode but case of Beomite to aluminum sheet, know than thin sheet and core low strength through buckling mode.