• Journal of the Society of Naval Architects of Korea
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• v.60 no.5
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• pp.388-396
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• 2023

As the government encourages the replacement of small FRP ships with eco-friendly aluminum ships due to environmental pollution problems, interest and demand for small aluminum ships are increasing. It is known that the vibration and noise of aluminum ships are somewhat vulnerable than that of FRP ships. However, in the process of designing and manufacturing small aluminum fishing boats, vibration and noise are not reviewed. In this study, vibration analysis is performed on three existing aluminum fishing boats, and the vibration characteristics of small aluminum boats are identified. Through this study, we intend to contribute to improving the vibration quality of small aluminum ships.

• Journal of the Society of Naval Architects of Korea
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• v.58 no.4
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• pp.206-213
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• 2021

Recently, although the size of the LNG Cargo Containment System (CCS) has been increasing, the secondary barrier is reported to remain unchanged, and the conventional Flexible Secondary Barrier (FSB) used in Mark-III type has been pointed out to be vulnerable to failure owing to thermal and cyclic loads. In this respect, a tensile test was carried out to verify the reinforcing effect of FSB using aramid fiber on weft compared to the conventional FSB. In order to consider the LNG leakage situation, a series of tensile tests were conducted from ambient to cryogenic temperature, and mechanical properties were evaluated for each fiber direction on account of anisotropy. Tensile behavior and fracture analyses were performed to confirm the mechanical properties of each material according to temperature. Tensile test results proved that replacing the aramid fiber instead of E-glass fiber used on weft is effective in enhancing the mechanical properties.

• Journal of the Society of Naval Architects of Korea
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• v.60 no.2
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• pp.110-119
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• 2023

The prediction of ship resistance performance is typically obtained by Computational Fluid Dynamics (CFD) simulations or model tests in towing tank. However, these methods are both costly and time-consuming, so hull-form designers use statistical methods for a quick feed-back during the early design stage. It is well known that results from statistical methods are often less accurate compared to those from CFD simulations or model tests. To overcome this problem, this study suggests a new approach using a Convolution Neural Network (CNN) with voxelized hull-form data. By converting the original Computer Aided Design (CAD) data into three dimensional voxels, the CNN is able to abstract the hull-form data, focusing only on important features. For the verification, suggested method in this study was compared to a parametric method that uses hull parameters such as length overall and block coefficient as inputs. The results showed that the use of voxelized data significantly improves resistance performance prediction accuracy, compared to the parametric approach.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.147-148
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• 2020

자율운항선박 관련 기술에 대하여 국제표준기구(ISO) 선박 및 해양기술 분과(TC8)에서 다양한 표준안이 개발되고 있다. TC8 산하 여러 세부분과에서 스마트 선박과 연계되어 개발되고 있는 표준안들에 대한 분석 및 각 국가별 전략 분석을 바탕으로 국내 간사 기관 대응 전략에 대해 연구한 결과를 소개하고자 한다. 또한 자율운항선박 관련 기술들의 표준화 로드맵 개발 결과를 공유하고자 한다.

• Bulletin of the Society of Naval Architects of Korea
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• v.40 no.2
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• pp.62-74
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• 2003

• Bulletin of the Society of Naval Architects of Korea
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• v.28 no.1
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• pp.13-17
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• 1991

• Bulletin of the Society of Naval Architects of Korea
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• v.37 no.4
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• pp.38-49
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• 2000

• Bulletin of the Society of Naval Architects of Korea
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• v.56 no.3
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• pp.35-41
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• 2019

• Bulletin of the Society of Naval Architects of Korea
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• v.59 no.2
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• pp.45-61
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• 2022

• Journal of the Society of Naval Architects of Korea
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• v.56 no.2
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• pp.103-108
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• 2019

A new state-of-the-art sloshing research equipment has developed to perform the model test of LNG tanks for the safer design of LNG cargo containment system in violent sloshing phenomena. This sloshing test system has developed by the Samsung Ship Model Basin (SSMB) and thoroughly verified. The accuracy of the motion of hexapods equipment for the excitation of a model tank has been verified. The maximum displacement in six degrees of freedom, harmonic motions of various frequencies, and irregular motions in wave conditions are measured and compared with input signals. In order to confirm the reliability of the post-processing program for measured impact pressure, the post-processed results were compared with those of the reference institute. A benchmarking sloshing test using 1/50 scale model of 160K LNGC tank was conducted for the verification of the whole testing system. The partial filing levels were considered. As a result of the experiment, it is confirmed that the results are in good agreement with those of the reference institute.