Journal of The Society of Naval Architects of Korea最新文献

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Fault Detection of Propeller of an Overactuated Unmanned Surface Vehicle based on Convolutional Neural Network 基于卷积神经网络的超驱动无人水面飞行器螺旋桨故障检测
Journal of The Society of Naval Architects of Korea Pub Date : 2022-04-20 DOI: 10.3744/snak.2022.59.2.125
Seung-dae Baek, Joohyun Woo
{"title":"Fault Detection of Propeller of an Overactuated Unmanned Surface Vehicle based on Convolutional Neural Network","authors":"Seung-dae Baek, Joohyun Woo","doi":"10.3744/snak.2022.59.2.125","DOIUrl":"https://doi.org/10.3744/snak.2022.59.2.125","url":null,"abstract":"This paper proposes a fault detection method for a Unmanned Surface Vehicle (USV) with overactuated system. Current status information for fault detection is expressed as a scalogram image. The scalogram image is obtained by wavelet-transforming the USV's control input and sensor information. The fault detection scheme is based on Convolutional Neural Network (CNN) algorithm. The previously generated scalogram data was transferred learning to GoogLeNet algorithm. The data are generated as scalogram images in real time, and fault is detected through a learning model. The result of fault detection is very robust and highly accurate.","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130878597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Experimental Study on IMO 2nd Generation Stability Assessment in Dead Ship Condition of 13K Chemical Tanker 13K化学品船死船条件下IMO第二代稳定性评估实验研究
Journal of The Society of Naval Architects of Korea Pub Date : 2022-04-20 DOI: 10.3744/snak.2022.59.2.89
Sang-Beom Lee, B. Moon
{"title":"An Experimental Study on IMO 2nd Generation Stability Assessment in Dead Ship Condition of 13K Chemical Tanker","authors":"Sang-Beom Lee, B. Moon","doi":"10.3744/snak.2022.59.2.89","DOIUrl":"https://doi.org/10.3744/snak.2022.59.2.89","url":null,"abstract":"The stability of the existing ships has been evaluated through numerical calculations in the steady-state, but recently the IMO proposed a new stability assessment criteria that the stability is evaluated in the state in which environmental loads from such as waves and wind act like the loads under actual ship operating conditions. In this study, IMO 2nd generation stability assessment method and procedure were summarized for the dead ship condition, and Direct Stability Assessment (DSA) was performed on 13K chemical tanker through basin model test. The model test is performed in the ocean engineering basin to implement wave and wind loads, and environmental conditions for waves were set height and period of the incident wave, considering the regular wave and wind generation range reproducible in the ocean engineering basin. In addition, to consider the effect of wind speed, the Beaufort Scale for wind speed was applied in the model test. 제어 불능상태),","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133265980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental Study on Spray Performance of Nozzles for Autonomous Fire Fighting Monitor 自主消防监测仪喷嘴喷射性能试验研究
Journal of The Society of Naval Architects of Korea Pub Date : 2022-04-20 DOI: 10.3744/snak.2022.59.2.80
Seong-Sun Rhyu, Hyoungtae Kim, Jeonghwa Seo
{"title":"Experimental Study on Spray Performance of Nozzles for Autonomous Fire Fighting Monitor","authors":"Seong-Sun Rhyu, Hyoungtae Kim, Jeonghwa Seo","doi":"10.3744/snak.2022.59.2.80","DOIUrl":"https://doi.org/10.3744/snak.2022.59.2.80","url":null,"abstract":"A systematic experimental study is carried out for the fire fighting monitor nozzle of 65A diameter to design and manufacture a new nozzle with better water spray performance than available domestic nozzles. The nozzle inlet pressure, flow rate and reach for the discharged water from the nozzle are measured by utilizing the experimental facility consisting of two pumps and piping system with a flow meter and pressure gauges. It was found that the baffle position and baffle head chamfering were the most sensitive design factors to be remarkably changed in the flow rate of the discharged water. Also, It was confirmed that the baffle position and the water exit area had the significant effect on the change in reach distance. The results obtained from this study are expected to be used effectively to design new nozzles with excellent spray performances and also to validate numerical analysis results for evaluating the water spray performance of fire fighting monitor nozzles.","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123844389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization of Sheet Arrangement of Membrane Panel in Korean LNG Cargo Containment System 韩国LNG货物密封系统膜板排片优化
Journal of The Society of Naval Architects of Korea Pub Date : 2022-04-20 DOI: 10.3744/snak.2022.59.2.109
Yeong-Su Kim, S. Ham, Kwang-phil Park
{"title":"Optimization of Sheet Arrangement of Membrane Panel in Korean LNG Cargo Containment System","authors":"Yeong-Su Kim, S. Ham, Kwang-phil Park","doi":"10.3744/snak.2022.59.2.109","DOIUrl":"https://doi.org/10.3744/snak.2022.59.2.109","url":null,"abstract":"LNG 화물창은 내부에 –163 oC의 액화천연가스를 보관해야 하기 때문에 일반 화물창과는 달리 특수한 재질로 이루어진 여 러 층의 단열재와 멤브레인 (membrane)으로 이루어져 있다. 특 히 멤브레인은 액체와 직접 닿는 부분이기 때문에 팽창, 수축에 견딜 수 있는 특수 합금으로 구성되며, 주름이 있는 형태로 만 들어지기도 한다. Fig. 1은 대표적인 LNG 화물창 타입인 GTT 사의 No.96과 Mark III를 보여준다. 현재 국내에서 제작하는 LNG 화물창의 경우, GTT에 기술료 를 지급해야 한다. 따라서, 기술 자립화를 위한 노력으로 한국 형 LNG 화물창이 개발 중이다. Fig. 2는 한국형 LNG 화물창의 구성을 보여준다. 한국형 LNG 화물창의 멤브레인 패널은 Fig. 3과 같이 corrugation sheet와 flat sheet의 조합으로 구성되어 있다. 따 라서, 멤브레인 패널의 배치 설계는 화물창 내벽에 적절한 길이의 corrugation sheet를 배치하는 것을 의미한다. 문제는 정해진 화 물창의 크기 내에 배치하기 위해서 여러 종류의 corrugation sheet를 사용하는데, corrugation sheet 종류만큼 금형을 제작 해야 한다. 따라서, 비용의 절감을 위해 가급적 corrugation sheet의 종류를 줄이는 것이 필요하다. 기존에는 사람이 수작업으로 corrugation sheet를 배치하였 다. 8각 기둥 형태로 구성된 LNG 화물창 내에 수작업으로 최소 한의 종류를 찾는 것은 불가능하다. 따라서 한 면씩 길이 방향과 폭 방향으로 배치하면서 기존에 사용된 corrugation sheet를 최 대한 활용하는 방법을 사용하였다. 이러한 방법은 초기에 설정 한 corrugation sheet의 종류에 따라 전체 종류와 수량에 큰 영 향을 미치게 된다. 또한, 화물창의 길이가 달라지는 경우 처음 부터 다시 sheet의 종류와 수량을 결정해야 하는 문제가 발생한 다. 따라서, 최적화된 corrugation sheet의 종류를 자동으로 결 정할 방법이 필요하다. 한국형 LNG 화물창 멤브레인의 Sheet 배치 최적화 김영수1・함승호1,†・박광필2 창원대학교 조선해양공학과 충남대학교 선박해양공학과","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"117-119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132340846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Study on Hull Form Variation of Fore Body Based on Multiple Parametric Modification Curves 基于多参数修正曲线的前船型变化研究
Journal of The Society of Naval Architects of Korea Pub Date : 2022-04-20 DOI: 10.3744/snak.2022.59.2.96
Sung-Woo Park, Seung-Hyeon Kim, Inwon Lee
{"title":"Study on Hull Form Variation of Fore Body Based on Multiple Parametric Modification Curves","authors":"Sung-Woo Park, Seung-Hyeon Kim, Inwon Lee","doi":"10.3744/snak.2022.59.2.96","DOIUrl":"https://doi.org/10.3744/snak.2022.59.2.96","url":null,"abstract":"선형의 개발 과정은 통상 횡단면적 곡선(SAC, Section Area Curve), 수선면 형상(waterline) 및 선수미 늑골선(frame section) 형상, 구상선수 및 선미끝단(transom)을 포함하는 Profile 형상 등을 수정하고 전산유체역학을 활용한 유체성능평가 및 일반구 획배치를 검토하는 과정을 반복적으로 수행하여 계약조건을 만 족하는 최적선형을 도출하게 된다. 이러한 최적선형 도출을 위해서는 선형이 정의되어야 하고, 선형을 정의하는 방법은 크게 2가지로 나눌 수 있다. 첫 번째는 전통적인 방법으로 오프셋 또는 오프셋을 지나는 스플라인 등의 곡선 기반의 선형 정의방법이다. 초기 바텐(wooden alpine)을 이용하여 수작업으로 선도를 작성하는 방법부터 시작되어 점 차 컴퓨터를 활용하게 되면서 선체의 형상을 점과 선을 이용 하여 스플라인 등의 곡선으로 선형을 정의하는 방법으로 아 직까지 다양한 CAD 프로그램들이 선형을 개발하는데 사용하 고 있다. 두 번째는 Mesh 또는 Surface 기반의 선형 정의 방법으로 CFD 등의 수치계산용 격자 또는 NURBS(Non-Uniform Rational B-Splines) Surface 등의 Surface 로 선형을 정의하는 방법이 다. 이러한 Mesh 또는 Surface 기반의 정의 방법은 오프셋 기 반의 선형 정의 방법에 비해 보다 정교하게 선형을 정의할 수 있다는 장점은 있으나 선형의 개발과정에서 선형을 수정할 시 다중 파라메트릭 변환곡선 기반 선수 선형 변환기법","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121370623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Noise Removal of Radar Image Using Image Inpainting 基于图像补漆的雷达图像去噪
Journal of The Society of Naval Architects of Korea Pub Date : 2022-04-20 DOI: 10.3744/snak.2022.59.2.118
Dongmin Jeon, Sang-jin Oh, Chae-og Lim, Sung-Chul Shin
{"title":"Noise Removal of Radar Image Using Image Inpainting","authors":"Dongmin Jeon, Sang-jin Oh, Chae-og Lim, Sung-Chul Shin","doi":"10.3744/snak.2022.59.2.118","DOIUrl":"https://doi.org/10.3744/snak.2022.59.2.118","url":null,"abstract":"해양 기상은 선박의 안전에 영향을 미치고, 경제적인 운항을 결정하는 데에 중요한 요소이기 때문에, 이를 파악하는 것은 선 박 운항을 스스로 제어하는 자율운항 기술에 필수적으로 선행 되어야 하는 연구 중 하나이다. 최근에는 4차 산업과 관련하여 각종 카메라, 레이다와 같은 센서들과 ICT(Information Communication Technology) 기술이 접목된 해상 상태 정보 수 집에 관한 연구가 이루어지고 있고 (Seol, 2018), 레이다 이미 지 또한 해상환경 정보를 담고 있으나, 획득한 레이다 이미지에 나타나는 노이즈로 인해 이미지가 손상되거나 파랑을 제외한 해상에 존재하는 선박과 같은 부유체 및 객체(부표, 육지, 섬, 기타 장애물 등)에 의해 명확하고 정확한 분석을 할 수 없게 되 는 경우가 발생한다. 이 때문에 효과적인 해상환경 예측을 위해 서 레이다 이미지상에 존재하는 해상정보가 아닌 부분들을 제 거하고, 제거된 자리를 주변 이미지와 부합되도록 복원하는 이 미지 재생산에 대한 전처리 과정이 필요하다. 1.2 관련 연구 현황","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"247 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115249959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Study on the Reflection of a Solitary Wave by a Vertical Wall Using the Improved Boussinesq Equation with Stokes Damping 基于Stokes阻尼的改进Boussinesq方程的垂直壁面反射孤波的数值研究
Journal of The Society of Naval Architects of Korea Pub Date : 2022-04-20 DOI: 10.3744/snak.2022.59.2.64
Jinsoo Park, T. Jang
{"title":"Numerical Study on the Reflection of a Solitary Wave by a Vertical Wall Using the Improved Boussinesq Equation with Stokes Damping","authors":"Jinsoo Park, T. Jang","doi":"10.3744/snak.2022.59.2.64","DOIUrl":"https://doi.org/10.3744/snak.2022.59.2.64","url":null,"abstract":"In this paper, we simulate the collision of a solitary wave on a vertical wall in a uniform water channel and investigate the effect of damping on the amplitude attenuation. In order to take into account the damping effect, we introduce the Stokes damping whose dissipation is dependent on the velocity of wave motion on the surface of a thin layer of oil. That is, we use the improved Boussinesq equation with Stokes damping to describe the damped wave motion. Our work mainly focuses on the amplitude attenuation of a propagating solitary wave, which may depend on the Stokes damping together with the initial position and initial amplitude of the wave. We utilize the method of images and a powerful numerical tool (functional iteration method) for solving the improved Boussinesq equation, yielding an effective numerical simulation. This enables us to find the amplitudes of the incident wave and reflected one, whose ratio is a measure of the (wave) amplitude attenuation. Accordingly, we have shown that the reflection of a solitary wave by a vertical wall is dependent on not only the initial amplitude and position of a solitary but the Stokes damping.","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130984827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the Reconstruction of Pressure Field in Sloshing Simulation Using Super-Resolution Convolutional Neural Network 基于超分辨率卷积神经网络的晃动仿真压力场重建研究
Journal of The Society of Naval Architects of Korea Pub Date : 2022-04-20 DOI: 10.3744/snak.2022.59.2.72
Hyo Ju Kim, Donghun Yang, Jung Yoon Park, Myunggwon Hwang, Sang Bong Lee
{"title":"Study on the Reconstruction of Pressure Field in Sloshing Simulation Using Super-Resolution Convolutional Neural Network","authors":"Hyo Ju Kim, Donghun Yang, Jung Yoon Park, Myunggwon Hwang, Sang Bong Lee","doi":"10.3744/snak.2022.59.2.72","DOIUrl":"https://doi.org/10.3744/snak.2022.59.2.72","url":null,"abstract":"Deep-learning-based Super-Resolution (SR) methods were evaluated to reconstruct pressure fields with a high resolution from low-resolution images taken from a coarse grid simulation. In addition to a canonical SRCNN(super-resolution convolutional neural network) model, two modified models from SRCNN, adding an activation function (ReLU or Sigmoid function) to the output layer, were considered in the present study. High resolution images obtained by three models were more vivid and reliable qualitatively, compared with a conventional super-resolution method of bicubic interpolation. A quantitative comparison of statistical similarity showed that SRCNN model with Sigmoid function achieved best performance with less dependency on original resolution of input images.","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132946065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Strength Characteristics of Passive Fire Protection Material Applied Structural Members on Fire Load 应用于构件的被动防火材料在火灾荷载下的强度特性
Journal of The Society of Naval Architects of Korea Pub Date : 2022-02-20 DOI: 10.3744/snak.2022.59.1.29
Sang-Chan Jo, S. Yu, J. Seo
{"title":"Strength Characteristics of Passive Fire Protection Material Applied Structural Members on Fire Load","authors":"Sang-Chan Jo, S. Yu, J. Seo","doi":"10.3744/snak.2022.59.1.29","DOIUrl":"https://doi.org/10.3744/snak.2022.59.1.29","url":null,"abstract":"","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116073326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Plate-Shaped Structures on Wind Load Against Variation of Draft 吃水变化时板形结构对风荷载的影响
Journal of The Society of Naval Architects of Korea Pub Date : 2022-02-20 DOI: 10.3744/snak.2022.59.1.9
S. Yeon, C. Kwon, Yoo-Chul Kim, Kwangsoo Kim
{"title":"Effect of Plate-Shaped Structures on Wind Load Against Variation of Draft","authors":"S. Yeon, C. Kwon, Yoo-Chul Kim, Kwangsoo Kim","doi":"10.3744/snak.2022.59.1.9","DOIUrl":"https://doi.org/10.3744/snak.2022.59.1.9","url":null,"abstract":"","PeriodicalId":135330,"journal":{"name":"Journal of The Society of Naval Architects of Korea","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122432074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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