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노인식,이재만,염철웅,Nho, In-Sik,Lee, Jae-Man,Yeom, Cheol-Woong 대한조선학회 2010 大韓造船學會 論文集 Vol.47 No.2
To consider effects of essential parameters of water impact pressure on dynamic structural responses of bow bottom structures, a parametric study for a ship bottom panel is carried out. The idealized pressure time history models were assumed by triangular and rectangular shapes in time domain. The main loading parameters are duration time and peak pressure value maintaining the same impulse value. The structural models for local bottom stiffened panels of a container ship are analysed. The natural frequency analysis and transient dynamic response analysis are performed using MSC/NASTRAN. Added mass effects of contacting water are considered and the pressure distributions are assumed to be uniform in the whole water contacting surface. The effects of loading parameters on the structural responses, especially maximum displacements, are considered. Besides the peak pressure value, effects of duration time correlated with natural frequencies are thought to be the important parameters.
빙 충돌에 대한 Mark Ⅲ 멤브레인형 LNG CCS의 구조 안전성 평가
노인식(In Sik Nho),윤영민(Young-Min Yun),박만재(Man-Je Park),오영택(Young-Taek Oh),김성찬(Sung-Chan Kim) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.2
In this study, a method for analyzing the collision and interaction between ice bergy bits and a Mark Ⅲ type liquid natural gas (LNG) carrier was considered, and the structural safety of a ship"s hull and cargo containment system (CCS) was evaluated. In the analysis, a constitutive model implementing the strain rate dependent mechanical procedure, compared with the accurate but complicated FSI analysis scheme, was suggested. When the ice bergy bits collided with ship"s side hull under the four assumed scenarios, the structural behaviors of the ship structure and LNG CCS were simulated by applying the suggested ice collision analysis procedure using the commercial hydro-code LS-DYNA. In addition, the effects of the shapes and colliding speed of the ice bergy bits on the ice-structure interaction and safety of the CCS were examined in detail.