http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
슬로싱 하중을 받는 KC-1 단열시스템의 표면 완충 효과
진교국,윤인수,양영철,Jin, Kyo Kook,Yoon, Ihn Soo,Yang, Young Chul 대한기계학회 2015 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.3 No.3
슬로싱 하중은 LNG 화물창의 내부 구조물에 강한 충격을 유발시킨다. 이는 슬로싱 하중에 의해 평면이나 구석 부위에 순간 압력을 증가시키기 때문에 멤브레인 타입의 화물창에서는 매우 위험하다. 멤브레인 타입의 화물창은 선체구조에 비해 매우 유연하므로, 유체-구조 상호작용은 슬로싱 하중을 받는 화물창의 구조해석에서 매우 중요한 역할을 한다. 본 연구는 유한요소해석 기법을 이용하여 LNG 유체와 KC-1 단열시스템의 경계에 대시포트를 이용하여 유체-구조 상호작용을 고려한 해석 방법에 대해 다루었다. 결론적으로 표면 완충 효과를 적용하였을 경우, KC-1 단열시스템의 폴리우레탄폼에서 발생하는 최대응력이 약 1.5 배 낮아지는 효과가 있음을 알아내었다. Sloshing of LNG cargo can cause high impact loads on the supporting and containing structures. This is particularly critical for membrane-type tanks since these will have flat surfaces and corner regions which can lead to increased peak pressures for sloshing impacts. The membrane-type containment system is much more flexible compared to the steel hull structure. As a result, fluid-structure interaction plays an important role in the structural analysis of the containment system under sloshing load. This study is based on the direct calculation method of applying sloshing loads to the KC-1 basic insulation system using finite element analysis. The structural analysis of KC-1 basic insulation system considers the dashpot as fluid-structure interaction between liquid cargo and the LNG containment system. The maximum stress of the polyurethane form for KC-1 insulation system is 1.5 times lower than one without dashpot.
오병택,김영균,윤인수,서흥석,홍성호,Oh, Byoung-Taek,Kim, Young-Kyun,Yoon, Ihn-Soo,Seo, Heung-Seok,Hong, Seong-Ho 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
LNG demand has been rapidly increasing in Korea for a variety of reasons including stable supply, non-polluting, and high combustion efficiency characteristics. As a result the construction and expansion of LNG storage facilities have been continuing at a vigorous pace. Korea Gas Corp. (KOGAS) has developed the design technology of the LNG storage tank. One of the most important structural core element of the LNG storage tank is the membrane, made by stainless steel. The membrane to be applied inside of LNG storage tank is provided with corrugations to absorb thermal contraction and expansion caused by LNG temperature. Analytical results have been performed to investigate the strength of the membrane and the reaction farce at the anchor point. Experimental studies are performed to investigate the deformation and strength of the membrane which is designed by Kogas. All experiments are conducted on the basis of RPIS, and we found the results are fully satisfied with the RPIS.
구속효과를 고려한 9% Ni강 균열의 파괴거동 해석에 관한 연구
김영균(Young Kyun Kim),윤인수(Ihn soo Yoon),김재훈(Jae Hoon Kim) 한국가스학회 2021 한국가스학회지 Vol.25 No.6
-162℃ 초저온 상태의 LNG를 저장하는 저장탱크의 내조는 균열과 같은 결함에 대한 구조 건전성 평가가 필요하다. 전통적인 파괴역학 관점에서는 응력확대계수 K, J-적분 그리고 CTOD를 이용한 단일 매개변수 평가가 주로 수행되어왔다. 그러나 실제 구조에서 발생되는 균열선단은 구조물의 크기, 시편형상 그리고 인장과 굽힘과 같은 하중의 형태에 따라 구속효과의 차이로 인한 영향이 발생하게 된다. 단일 매개변수 파괴역학을 보완하기 위해 다양한 시도가 있었고, 대표적으로 Q-응력법이 있다. 본 논문에서는 비선형 탄성영역의 균열선단 응력장 평가에 적합한 J적분에 Q응력을 유도하여 2 매개변수 접근법을 사용하고자 한다. SENB 시편의 균열비 0.1~0.7 그리고 광폭시편 균열비 0.2~0.6에 시편 균열선단의 응력을 J-Q 평가법을 이용하여 구속효과를 정량적으로 평가 하였다. Inner shell material of LNG storage tanks that store ultra-low temperature LNG at -162℃ requires structural integrity assessment of a crack-like defect. From the viewpoint of conventional fracture mechanics, the assessment has mainly performed by single parameter using stress intensity factor K, J-integral and CTOD. However, the stresses in a material of crack tip are not unique caused by constraint loss due to size and geometry of the structure. Various attempts have been made to complement a single parameter fracture mechanics, typically with Q-stress. In this paper, we have performed a two-parameter approach by deriving the Q-stress coupling with J-integral suitable for the evaluation of the crack tip stress field in the non-linear elastic region. A quantitative evaluation of the constraint effect has performed by using the J-Q approach. It was evaluated that the SENB type specimen had a crack ratio of 0.1 to 0.7 and the wide type specimen had a crack ratio of 0.2 to 0.6.
한국형 LNG 선 화물창 개발을 위한 목업탱크의 안전성 검증
김지훈(Ji-Hun Kim),윤인수(Ihn-Soo Yoon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Korea’s first LNG (Liquefied Natural Gas) cargo containment system has been developed since 2004. In process of acquiring certification from classifications, stability evaluation of the system is necessary. There have been lots of structural calculations, building an open mock-up and experiments about insulation panels, etc. However, more realistic data which guarantee the stability of the system during operation has been required, and it has been recognized that a closed mock-up tank could clarify most doubts about the stability of the system. Closed mock-up tank consists of steel piles, soil, concrete mat and steel hull, and is full of LNG in it. Steel piles and soil have been modeled by spring elements, steel hull by shell elements and LNG by acoustic elements and spring elements equivalent to the gravity. The model has been analyzed for three cases such as normal operation case, wind load case and safe shutdown earthquake case.
스트레인 게이지를 이용한 Pilot LNG 저장탱크 멤브레인 실 변형 거동 측정
김영균(Young Kyun Kim),윤인수(Byoung Taek Oh),오병택(Seong Ho Hong),홍성호(Young Myung Yang),양영명(Ihn Soo Yoon) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Korea Gas Corp. has developed the design technology of the LNG storage tank. The membrane to be applied inside of the LNG storage tank is provided with corrugations to absorb thermal contraction and expansion caused by LNG temperature changes. It is very important to measure their thermal strains under LNG temperatures by analytical and experimental stress analysis of the membrane. We have developed a stress measurement system using strain gages and measured the strain during cooldown and storing the LNG. We also analyzed the measured data by comparison with the FEM data. On the basis of these results, we could design and assure the application of the Kogas Membrane to large scale LNG storage.