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경항공모함 이·착함 성능평가 및 안전임무 수행범주 일관 해석 연구
홍사영(Sa Young Hong),박동민(Dong-Min Park),정재환(Jae Hwan Jung),서민국(Min-Guk Seo),조석규(Seok-Kyu Cho) 대한조선학회 2024 大韓造船學會 論文集 Vol.61 No.2
The Safe Operating Envelope (SOE) combined with Short-Take-Off and Vertical Landing (STOVL) performance is an essential consideration of a light aircraft carrier for design of hull shape with excellent seakeeping performance in terms of naval air operations as well as traditional naval ship missions such as Transit and Patrol (TAP), and Replenishment at Sea (RAS) and so on. A variety of procedures are systematically combined to determine SOE considering rather complicated missions associated with operation of aircraft onboard. The evaluation of take-off and landing safety missions onboard should consider wind effect on deck and severer seakeeping indices and standards compared with conventional naval ships. In order to support take-off and landing missions, various support activities of the crews are required. So, additional evaluation is needed for indicators such as MSI(Motion sickness Index) and MII(Motion Induced Interruptions), which are quantitative indicators of work ability that appear as a result of motion response. In this study, a standard procedure is developed including the seaworthiness performance indicators, standards, and evaluation procedures that should be considered during design of STOVL aircraft carrier. Analysis results are discussed in terns of air-wake on deck as well as seakeeping indices associated with design parameter changes in view of conceptual design of a light aircraft carrier.
공기챔버 위치에 따른 폰툰형 초대형 구조물 유탄성응답 해석
홍사영(SA-YOUNG HONG),경조현(JO-HYUN KYOUNG),김병완(BYOUNG-WAN KIM) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.1
A numerical investigation ts made on the effects of the location and shape of the front wall of an OWC (Oscillating Water Column) chamber on the hydroelastic response of a VLFS. Most of the studies on the effects of an OWC chamber on the response of a VLFS have assumed the location of the OWC chamber to be at the front of the VLFS. In the present study, an OWC-chamber is introduced at an arbitrary position in relation to a VLFS to determine the influence of the location and shape of the OWC chamber on the hydroelastic response of the VLFS. A finite element method is adopted as a numerical scheme for the fluid domain. or the finite element method, combined with a mode superposition method, is applied in order to consider the change of mass and stiffness The OWC chamber in a piecewise constant manner or the facilitated anefficient analysis of The hydroelastic response of the VLFS, as well as the easy modeling of different shape and material properties for the structure. Reduction of hydroelastic response of the VLFS is investigated for various locations and front wall shapes of the OWC chamber.
초대형 부유식 해상구조물의 유탄성 응답 저감을 위한 진동수주형 방파제 적용
홍사영(Sa Young Hong),경조현(Jo Hyun Kyoung) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
A numerical analysis is made to investigate the hydroelastic response of pontoon-type VLFS with OWC-type breakwater. A OWC(Oscillating Water Column)-type breakwater which is installed in the middle of the VLFS is considered to reduce the hydroelastic response. To analyze the coupled hydroelastic response of VLFS with OWC-type breakwater the mathematical formulation is made in the scope of the classical potential theory. Localized finite element method based on the classical variational principle is adopted as numerical scheme for fluid domain. To analyze the elastic motion of VLFS the mode-superposition method is adopted. The coupled hydroelastic response of VLFS is investigated for the combinations of main parameters of OWC-type breakwater such as location and shape of OWC chamber, bending rigidity variation of VLFS and OWC chamber.
홍사영(Hong, Sa-Young),경조현(Kyoung, Jo-Hyun),조석규(Cho, Seok-Kyu),김병완(Kim, Byoung-Wan) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.1
In this paper, the modified direct method employing beam transformation technique is proposed in order to efficiently calculate hydroelastic responses of floating structure. Since the proposed method expresses the displacements of three-dimensional structure with those of transformed beam which leads to small number of equations of motion, the method is numerically efficient compared to the conventional direct method. To verify the efficiency of the proposed method, a 500 m-long floating structure under wave loads is considered in numerical example. Displacements, bending moments, torsion moments and shear forces are calculated and computing time is examined. The results are also compared with those of the conventional direct method.
홍사영(Sa Young Hong),김병완(Byoung Wan Kim) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
기후온난화의 지구적 어젠다는 다양한 리소스의 신재생 에너지 개발 및 이용에 강력한 추동력을 주고 있다. 그 중에서 바람과 태양광을 이용한 시도가 주를 이루고 있다. 그런데, 풍력발전은 소음문제, 태양광발전은 빛의 반사 및 산림의 훼손으로 인한 환경피해로 인해 해양으로의 진출로 방향이 바뀌고 있으며 자원의 대규모 이용 및 리소스의 고품질 등의 긍정적인 요소가 대규모 해상 신재생 에너지 개발을 부추기고 있다. 전통적인 부유식 해양구조물의 형태인 스파플랫폼이나 반잠수식 시추선 형태의 구조물을 기반구조물로 하는 해상풍력발전에 비해 저수지 등의 내수면 태양광 발전단지를 해상으로 확장하는 문제는 기술적으로 리스크가 상대적으로 많다고 볼 수 있다. 더욱이 태양광발전에 있어 정부의 조급하고 과도한 신재생 에너지 추진 정책과 내수면에서의 일천한 경험이 공학적으로 명백한 위험요소에 대한 의도적 회피와 무지로 인한 문제점 해결의 핵심을 놓칠 수 있다는 우려가 있다. 또한 최근의 언론의 보도를 보면 우리나라의 대규모 태양광 발전단지 후보지가 철새 도래지에 인접하여 새똥으로 인한 예상치 못한 운영상의 어려움이 수면에 떠오르고 있다. 본 연구에서는 그동안 내수면 이용을 대상으로 하여 고려되지 않았던 해상에서의 부유식 수상태양광 구조물의 공학적 핵심 요소에 대해 살펴보고 이에 대한 해결 방안을 논의하고자 한다. 이를 위해서는 MW급 구조물의 특징을 반영한 유탄성 해석 기반의 설계 및 해석, 해상파로 인한 여러 가지 추가적인 고려사항 등을 살펴볼 것이다. 마지막으로 MW 규모의 부유식 태양광 구조물에 대한 설계/해석 예를 보일 것이다. The global agenda of climate warming is giving a strong impetus to the development and use of renewable energy from various resources. Among them, attempts using wind and sunlight are predominant. However, wind and solar power generations are changing their direction to enter the ocean due to environmental damage caused by wind turbine induced noise, reflection of light and damage to forests, while wind and solar energy has positive factors such as large-scale use of resources and high quality of resources. It promotes the development of ocean renewable energy. Compared to offshore wind power generation using traditional floating offshore structures such as spa platforms or semi-submersible rig-type structures, the problem of expanding inland floating solar power generation complexes to the sea has rather a technically high risk. Moreover, there is concern that the government"s hasty and excessive renewable energy promotion policy in solar power generation in GW scale, and its meager experience in inland waters may miss the key to solving problems due to intentional avoidance and ignorance of obvious engineering risk factors at the sea. In addition, according to recent media reports, as the candidate sites for large-scale solar power generation complexes in Korea are adjacent to migratory bird habitats, unexpected operational difficulties due to bird droppings are rising to the surface. In this study, we intend to examine the engineering key elements of floating solar power structures in the sea, which had not been considered for the use of inland waters, and discuss solutions. To this end, we will examine the design and analysis based on the hydroelastic analysis that reflects the characteristics of MW-class structures, and various additional considerations due to sea waves. Finally an example of integrated design and analysis practice of a MW scale photovoltaic power generation plant structure.
해상크레인을 이용한 다양한 해저 장비의 설치 작업 시 상하운동응답특성에 관한 모형 시험 연구
최영명(Young-Myung Choi),남보우(Bo Woo Nam),김남우(Nam Woo Kim),박인보(In Bo Park),홍사영(Sa Young Hong),김종욱(Jong Wook Kim) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.2
An experimental study on a subsea installation using an offshore crane was conducted. Concrete blocks, suction piles, and manifolds were considered in this study. Free decay tests were conducted to investigate the fluid characteristics of the subsea structures. The added masses of the structures were estimated. The motion response amplitudes of the subsea structures were compared for different structures and water depths. In addition, the dynamic tension transfer function of the crane wire was investigated. The root mean square values of the heave motion and the dynamic amplification factor of the wire tension were investigated in irregular waves.