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A Study on the Structural Shape and Vibrational Characteristics of Aluminum Sandwich Panel
배동명,손정대,Bae, Dong-Myung,Son, Jung-Dae The Korean Society of Fisheries and Ocean Technolo 2004 수산해양기술연구 Vol.40 No.4
본 연구에서는 실선에 적용된 알루미늄 하니콤 샌드위치 판 (AHSP)을 저자가 제안한 심재의 형상이 피라미드인 알루미늄 샌드위치 판의 구조적 특성 및 진동특성을 검토해 보았다. 알루미늄 피라미드 샌드위치 판(APSP)의 기초 자료로 쓰일 수 있게 심재의 각도변화, 높이변화 및 면재와 심재의 두께변화에 따른 구조적 특성을 검토한 결과 APSP가 강도 및 강성에서 우수함을 보였으며, 질량대비 큰 강성 때문에 고유진동수도 다소 크게 평가되었다. Aluminum honeycomb sandwich panel (AHSP) not only have high flexural rigidity and strength per density but also excellence in anti-vibration and anti-noise properties. Their properties are very useful for build airplane and high speed crafts, which need lighter-weighted and more strengthed element. Recently, the AHSP is regarded as a promising strength member of light structures like the hull of high speed crafts. Generally, the core shape of aluminum sandwich panel (ASP) is the hexagonal shape of honeycomb. But, in this paper, authors proposed the ASP with pyramid core, as the ASP model of new type, and analysed the structural and vibrational characteristics for aluminum pyramid sandwich panel (APSP) as this new ASP type, according to the thickness variation of core and face, the height variation of core. The applied sandwich models have isotropic and symmetrical aluminum faces and pyramid cores. And, the applied boundary conditions are simple, fixed and free support.
裵東明(Dong-Myung Bae),洪奉基(Bong-Ki Hong) 한국해양공학회 1989 韓國海洋工學會誌 Vol.3 No.1
In this paper, the Tuna Long Liner of 48m suffered from serious damages among rough seas, and its main hull was bent at S.S.5(Square Station No.5)by hogging moment. The ship under consideration was in the full load condition, was carring a large amount of caught fish in the fish - hold. If slamming impact pressure occurs at S.S.7, a large hogging moment may appear between S.S.7 and mid - part. The analysis based on the problem of hydro - elastic interaction shows that this damage is caused by hogging moment due to bottom slamming, although, in the case of conventional ships, slamming causes a large sagging moment in the mid - part. Elastic responses such as the whipping vibration are calculated step by step for the ship idealized as a Timoshenko beam, taking account of slamming impact force, which are determined with respect to instantaneous configurations. It is shown that slamming response gives hogging moment enough for the damage in unlucky condition of waves corresponding to the sea state reported.
선체응력감시시스템 개발을 위한 모형선의 변형률 측정에 관한 실험적 연구
배동명(Dong Myung Bae),안상현(Sang Hyun Ahn),자키(A.F.Zakki) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
Ship is a complex structure that loaded by the various external forces. When the disaster and accident occurred, the human and economic losses may be happened, the other consequences is a serious pollution due to the leakage of cargo tank such as oil, dangerous chemical liquids and etc. Following that conditions the IMO has recommended to implement hull stress monitoring system. Electrical resistance strain gages were installed on the model ship. Considering the parameters of wave conditions while anchoring and sailing, the strain of ship model is measured in real time. In order to verify the accuracy of strain measurement, the optical fiber sensors (Fiber Bragg Grating) is carried out. The result shows that electrical resistance strain gage is considered to be changed by the fiber optics sensors.