A60급 구획 적용 격벽 관통용 관의 열전달 특성 I : 관의 설계에 따른 과도 열해석

박우창(Woo-Chang Park),송창용(Chang Yong Song),나옥균(Ok-Gyun Na) 한국해양공학회 2018 韓國海洋工學會誌 Vol.32 No.5

In order to protect lives and prevent large-scale injuries in the event of a fire on a ship or an offshore plant, most classification societies are strengthening their fire resistance designs of relevant cargo holds and accommodation compartments to keep flames from being transferred from a fire point to other compartments. Particularly in critical compartments, where flames should not propagate for a certain period of time, such as the A60 class division, both the airtightness and fire-resistant design of a piece passing through a bulkhead are subject to the Safety of Life at Sea Convention (SOLAS) issued by the International Maritime Organization (IMO). In order to verify the suitability of a fire-resistant design for such a penetrating piece, the fire test procedure prescribed by the Maritime Safety Committee (MSC) must be carried out. However, a numerical simulation should first be conducted to minimize the time and cost of the fire resistance test. In this study, transient thermal analyses based on the finite element method were applied to investigate the heat transfer characteristics of a bulkhead penetration piece for the A60 class compartment. In order to determine a rational bulkhead penetration piece design, the transient heat transfer characteristics according to the variation of design parameters such as the diameter, length, and material were reviewed. The verification of the design specification based on a numerical analysis of the transient heat transfer performed in this study will be discussed in the following research paper for the actual fire protection test of the A60 class bulkhead penetration piece.

과도 열전달해석 및 화재시험 기반 A60 격벽 관통관의 방화성능 민감도해석과 메타 모델링

박우창 ( Woo-chang Park ),송창용 ( Chang Yong Song ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.2

A60 class bulkhead penetration piece is a fire resistance system installed on bulkhead compartment to protect lives and to prevent flame diffusion in case of fire accident in ship and offshore plant. This study deals with evaluation on sensitivity of fire resistance performance and meta-modeling characteristics for A60 class bulkhead penetration piece using transient heat transfer analysis and fire test. The transient heat transfer analysis was carried out to evaluate the fire resistance design of the A60 class bulkhead penetration piece, and verified the analysis results via the fire test. In the sensitivity analysis, the bulkhead penetration piece length, diameter, material type and insulation density were applied to the design factors, and output responses were considered weight, temperature, cost and productivity. Quantitative effects on the output responses for each design factor were evaluated using design of experiment. Optimum design case was also identified to minimize the weight of A60 class bulkhead penetration piece while satisfying the allowable limits of output responses. From the design of experiment results, various meta-models such as Kriging, response surface method and radial basis function based neural network were generated. The design of experiment results were validated by the meta-modeling results. It was concluded that the radial basis function based neural network among the meta-models was able to explore the design space of the A60 class bulkhead penetration piece with the highest accuracy.

A60급 갑판 관통 관의 방화성능 평가를 위한 과도 열전달 해석과 화재시험

박우창(Woo Chang Park),송창용(Chang Yong Song) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.4

A60급 갑판 관통 관은 선박과 해양플랜트의 화재 발생 시 인명의 보호와 화염전파를 방지하기 위해 갑판 구획에 설치되는 방화 장치이다. A60급 갑판 관통 관이 새로 개발되거나 기존의 설계가 변경될 경우 국제해사기구의 화재시험절차 규정에 따라 A60급 갑판 관통 관의 방화성능을 검증하도록 요구하고 있다. 따라서, 본 논문에서는 신규 개발된 선박과 해양플랜트용 A60급 갑판 관통 관의 방화 설계의 적합성을 평가하기 위해 과도 열전달 해석을 수행하였고, 화재시험을 통해 해석결과의 타당성을 검증하였다. 또한 A60급 갑판 관통 관의 열전달 특성은 관의 직경, 내부형상 그리고 재질과 같은 설계 사양에 따라 비교하여 검토하였다. 과도 열전달 해석은 범용 유한요소법 소프트웨어인 ABAQUS/Implicit를 사용하여 수행하였으며, 해석결과의 검증을 위한 화재시험은 해사안전위원회에서 규정한 화재시험절차 코드에 따라 수행하였다. 본 연구에서 검토한 A60급 갑판 관통 관의 방화성능은 국제 해상안전규정을 만족하였고, 재질 사양의 설계가 중요한 것으로 나타났다. 최대 시험온도를 기준으로 SUS316L 재질의 측정온도는 S45C 재질보다 평균적으로 25% 낮게 나타났고, 이때 각 재질의 열전도계수와 비열의 차이는 각각 17%와 58%였다. A60 class deck penetration piece is a fire-resistance apparatus installed on the deck compartment to protect lives and prevent flame diffusion in fire accidents. In case that the A60 piece is newly developed or its initial design is revised, it is important to verify the fire resistance performance using a fire test procedure (FTP) code. In this paper, transient heat transfer analysis was carried out to evaluate the fire resistance design compatibility of the newly devised A60 piece. The analysis results were verified via a fire test. The heat transfer characteristics were also investigated by comparing design specifications, such as diameter, internal configuration, and material type. The analysis was performed using ABAQUS/Implicit, and the fire test was performed according to the FTP code. The fire resistance performance of the A60 pieces satisfied the safety of life at sea convention regulation. The material type was the most important design specification for the A60 piece. Based on the maximum test temperature, the measured temperature of SUS316L material was 25% lower than that of S45C on average. The differences between thermal conductivity and specific heat of each material were 17% and 58%, respectively.

다중 섬 유전자 알고리즘 기반 A60 급 격벽 관통 관의 방화설계에 대한 이산변수 근사최적화

박우창(Woo-Chang Park),송창용(Chang Yong Song) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.6

A60 class bulkhead penetration piece is a fire resistance system installed on a bulkhead compartment to protect lives and to prevent flame diffusion in a fire accident on a ship and offshore plant. This study focuses on the approximate optimization of the fire resistance design of the A60 class bulkhead penetration piece using a multi-island genetic algorithm. Transient heat transfer analysis was performed to evaluate the fire resistance design of the A60 class bulkhead penetration piece. For approximate optimization, the bulkhead penetration piece length, diameter, material type, and insulation density were considered discrete design variables; moreover, temperature, cost, and productivity were considered constraint functions. The approximate optimum design problem based on the meta-model was formulated by determining the discrete design variables by minimizing the weight of the A60 class bulkhead penetration piece subject to the constraint functions. The meta-models used for the approximate optimization were the Kriging model, response surface method, and radial basis function-based neural network. The results from the approximate optimization were compared to the actual results of the analysis to determine approximate accuracy. We conclude that the radial basis function-based neural network among the meta-models used in the approximate optimization generates the most accurate optimum design results for the fire resistance design of the A60 class bulkhead penetration piece.

수소압축기 내장 충전탱크용 벨로우즈의 형상 파라미터 변화에 따른 구조 성능 고찰

박우창(WOO CHANG PARK),정민석(MIN SEOK CHEONG),송창용(CHANG YONG SONG) 한국수소및신에너지학회 2024 한국수소 및 신에너지학회논문집 Vol.35 No.1

In this study, design parameter exploration based on finite element analysis was performed to find the optimal shape of bellows, the key component of compressor-embedded refueling tank for a newly developed hydrogen refueling station capable of high-pressure charging above 900 bar. In the design parametric study, the design variables took into account the bellows shapes such as contour radius and span spacing, and the response factors were set to the maximum stress and the gap in the contact direction. In the shape design of the compressor bellows for hydrogen refueling station considered in this study, it was found that adjusting the contour span is an appropriate design method to improve the compression performance and structural safety. From the selection of optimal design, the maximum stress was reduced to 49% compared to the initial design without exceeding the material yield stress.

부유체 구조물의 침수 깊이에 따른 폭발응답 특성

송창용(Chang Yong Song),박우창(Woo-Chang Park),박윤용(Yoon-Yong Park),임성환(Sung-Hwan Im),최보엽(Bo-Yeop Choi),김병남(Byung-Nam Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.5

해상 LNG 벙커링용 8 인치 선회 조인트의 구조강도 평가와 신뢰성 해석

임성환(Seong-Hwan Lim),송창용(Chang-Yong Song),박우창(Woo-Chang Park),홍성기(Seong-ki Hong),이정(Jung Lee),김세민(Se-min Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

There is a growing need for LNG bunkering system development with increasing demand for LNG fuel. The application of LNG bunkering system allows the LNG mined from the offshore plant to be transported directly to the LNG carrier hold at sea. The LNG bunkering system requires various safety modules to safely transport the LNG at cryogenic temperature. The swivel joint of the LNG bunkering system is a safety module to prevent excessive stress due to external forces by not restraining the rotational motion of the flexible hose line. In this study, the structural strength of an 8-inch swivel joint was evaluated based on the design load conditions of OCIMF, the international design specification for crude oil and LNG transport systems. For evaluating the structural strength, the three dimensional finite element model of 8-inch swivel joint was generated and finite element analysis was carried out considering the OC-IMF design load conditions. Reliability analysis was performed using Monte Carlo simulation(MCS) in order to improve design safety by considering uncertainty of operating environment. In the reliability analysis, the reliability level of structural strength results according to the variation of the design load in the ocean were evaluated.