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Numerical Simulation of the Effect of Buoy Geometries on PTO of Wave Energy Converters 浮标几何形状对波浪能转换器PTO影响的数值模拟
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-131
A. Hamada, M. Fürth
{"title":"Numerical Simulation of the Effect of Buoy Geometries on PTO of Wave Energy Converters","authors":"A. Hamada, M. Fürth","doi":"10.5957/smc-2021-131","DOIUrl":"https://doi.org/10.5957/smc-2021-131","url":null,"abstract":"Moving water has one of the highest energy densities, yet a major untapped and underutilized area of energy production is wave energy. With the recent interest in the Blue Economy, this is about to change. Point Wave Energy Converter (PWEC) absorbs the wave energy at a single point and is characterized by the buoy surface component and a longer subsurface component that is attached to the seabed. The motion of the top buoy is used to pump fluid or drive a linear generator, which in turn provides power. This paper numerically investigates different shaped surface buoys, with a focus on the power-generating ability of the system, for a single point WEC using a non-linear free surface approximation. Three-dimensional simulations of the buoys in various sea states were modeled in OpenFOAM using Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations with Finite Volume Method (FVM). The dynamic mesh module was integrated with the two-phase solver, and the mechanical system of the WEC was modeled with a forced oscillator mechanism. By studying the displacements, frequency responses, and design parameters, the optimal buoy shape for maximizing energy output was determined. Further, the guidance regarding the effect of changes in the geometry, represented by the length to diameter ratio of the shape, is discussed. The results showed that the spheroid buoy shape with a low length to diameter ratio is a good candidate shape to extract wave energy since it has a large waterplane area.","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124624021","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: 5
A Method of Automated Work Observation for Ship Production Using Deep Neural Networks 基于深度神经网络的船舶生产作业自动化观测方法
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-041
T. Shinoda, Takashi Tanaka, Hayato Okamoto, Daisuke Umemoto
{"title":"A Method of Automated Work Observation for Ship Production Using Deep Neural Networks","authors":"T. Shinoda, Takashi Tanaka, Hayato Okamoto, Daisuke Umemoto","doi":"10.5957/smc-2021-041","DOIUrl":"https://doi.org/10.5957/smc-2021-041","url":null,"abstract":"It is important to increase the productivity of every shipyard. Visualizing the actual work status during any industrial activity is essential. Work observation as one of the methods of industrial engineering has been applied in various fields in shipyards in Japan to increase productivity. However, current work observation requires both time and labor, and in some cases, shipyards hesitate to implement work observation. The aim of this study is to develop a methodology that uses deep neural networks to reduce the disadvantages of current work observation approaches while identifying work tasks and the accuracy of this observation.","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124850026","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
Sensor-Based Structural Health Monitoring for Marine and Offshore Structures 基于传感器的海洋和近海结构健康监测
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-021
Bo Wang, Meng-lung Liu, Yong Chen
{"title":"Sensor-Based Structural Health Monitoring for Marine and Offshore Structures","authors":"Bo Wang, Meng-lung Liu, Yong Chen","doi":"10.5957/smc-2021-021","DOIUrl":"https://doi.org/10.5957/smc-2021-021","url":null,"abstract":"The objective of this study is to develop the sensor-based structural health monitoring (SHM) system using a reduced order model (ROM) wherein a modal superposition method is implemented to reconstruct hull girder load distributions of the entire structure under wave-induced loads. Seakeeping and finite element (FE) analyses are performed to obtain the structural response for various wave conditions. A set of specific wave headings and frequencies is selected to construct base wave modes, and the structural response can be reconstructed under arbitrary wave loads. Case studies using a containership and an FPSO have been conducted to verify this new methodology.","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130985099","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
Bringing Big Data Technology to Wind Turbine Installation Vessels 将大数据技术应用于风力涡轮机安装船
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-062
Kayo Vanderheggen, Nate Meredith, J. Janssen, A. Morandi
{"title":"Bringing Big Data Technology to Wind Turbine Installation Vessels","authors":"Kayo Vanderheggen, Nate Meredith, J. Janssen, A. Morandi","doi":"10.5957/smc-2021-062","DOIUrl":"https://doi.org/10.5957/smc-2021-062","url":null,"abstract":"Digitalization is a key component of the ongoing Energy Transition. Although the offshore and maritime industries tend to be conservative in the adoption of new technologies, in recent years a digital journey was embraced to stay competitive, safe, and efficient. Data from mobile offshore units can be transformed into something valuable. However, collecting and processing of system’s data requires proper infrastructure, a software platform that handles data delivery and applications that translate the data into valuable information.\u0000 The challenge is therefore to turn good ideas and intentions into solutions that add real value. With this challenge in mind, in recent years GustoMSC | NOV worked on Big Data technology for wind turbine installation vessels (WTIVs). The purpose of this endeavor is to assist our end users in increasing the safety and efficiency of their operations.\u0000 This paper addresses some key aspects and components of this digital journey and shares experiences on merging Information Technology (IT) and Operational Technology (OT) environments in an ongoing effort to fulfill the promise that Industrial Internet of Things (IIoT) technology brings. A practical example is presented where Big Data is used to boost the performance of mobile offshore wind installation units.","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115000813","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
Long-Life Coatings for Offshore Structures 海上建筑用长寿命涂料
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-075
W. Darden
{"title":"Long-Life Coatings for Offshore Structures","authors":"W. Darden","doi":"10.5957/smc-2021-075","DOIUrl":"https://doi.org/10.5957/smc-2021-075","url":null,"abstract":"Coatings are used on offshore steel structures to prevent corrosion and to preserve their appearance. Conventional coating systems require repainting after only 10-15 years. Fluoropolymer coatings have been used on offshore structures since the mid-1980’s. These coatings offer excellent corrosion protection as well as good gloss and color retention for more than 30 years in some cases. Using fluorinated coating systems can substantially lower life cycle coating costs and require fewer maintenance cycles than conventional coatings.","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127182466","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
Tumblehome Ships - From Greek Triremes to the Zumwalt 从希腊特里勒姆河到朱姆沃尔特
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-016
R. Roddy
{"title":"Tumblehome Ships - From Greek Triremes to the Zumwalt","authors":"R. Roddy","doi":"10.5957/smc-2021-016","DOIUrl":"https://doi.org/10.5957/smc-2021-016","url":null,"abstract":"After almost a century the US Navy has reintroduced tumblehome into the design of naval combatants. This paper discusses some of the reasons tumblehome was originally designed into ships and why it served it owners well for many centuries. The transition from sail to steam power a little over a century ago led to a variety of problems with the combatant ships designed with tumblehome where the lack of damage stability caused a major loss of life as these ships sank so quickly. During World War I ships designed with tumblehome fell out of favor and some of the ships were actually modified to remove the tumblehome from the design. These changes in the design of tumblehome ships are discussed in this paper.","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122358080","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
Low Friction Recoating Performance Improvements Aboard A Passenger Ferry 客运渡轮上低摩擦涂层性能的改进
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-056
T. Harris, A. Kennedy
{"title":"Low Friction Recoating Performance Improvements Aboard A Passenger Ferry","authors":"T. Harris, A. Kennedy","doi":"10.5957/smc-2021-056","DOIUrl":"https://doi.org/10.5957/smc-2021-056","url":null,"abstract":"In recent years, there have been many technological advancements to support greener vessel operations and improved performance. The National Research Council of Canada evaluated the effect of a low friction hull coating from both a fuel consumption and power savings perspective. To quantify the variation in both fuel and power, an analysis methodology was adopted from the ISO 19030 standard for measuring the change in hull and propeller performance. The results of this analysis indicated that between 17.5 and 20.5 knots the power required to achieve cruising speed decreased by an average of 3.56% subsequent to the hull recoat. This translates to a fuel consumption reduction of 3.27% within the same speed range. The improvements in performance were most notable at 20.5 knots.","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134211253","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
Applied Data Analytics to Buoy Records for Weather Window Evaluation 应用数据分析浮标记录的天气窗口评估
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-082
Tirtharaj Bhaumik, Shiladitya Basu
{"title":"Applied Data Analytics to Buoy Records for Weather Window Evaluation","authors":"Tirtharaj Bhaumik, Shiladitya Basu","doi":"10.5957/smc-2021-082","DOIUrl":"https://doi.org/10.5957/smc-2021-082","url":null,"abstract":"This paper analyzes weather data recorded by typical oceanographic buoys using data analytics and regression techniques. Time series data over a period of more than four decades (1976 – 2020) are reviewed and profiled. A set of key variables including seasonality, wind speed, wind direction, wave period, wave direction, etc., are screened from the buoy measurements to build a predictive model based on multiple linear regression for significant wave height prediction. A sensitivity analysis is then conducted for the available weather window corresponding to specified threshold operational limits of the significant wave height. Key insights are presented along with suggestions for future work to assist marine operators in planning and derisking offshore operations. Utilizing the algorithms and workflows presented in this paper, a user can increase confidence in weather window prediction, and develop safer, efficient offshore operation plans.","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114949749","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 of Vortex Shedding behind a NACA 0009 Hydrofoil NACA 0009 水翼后涡流剪切的数值研究
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-053
Hestetraeet Johannessen
{"title":"Numerical Study of Vortex Shedding behind a NACA 0009 Hydrofoil","authors":"Hestetraeet Johannessen","doi":"10.5957/smc-2021-053","DOIUrl":"https://doi.org/10.5957/smc-2021-053","url":null,"abstract":"This paper addresses the propeller singing mitigation strategy of implementing an anti-singing edge so that the vortex shedding mechanism causing the excitation at the trailing edge of the propeller blade can be reduced. A Reynolds-Averaged Navier Stokes model with a k-ε turbulence formulation in 2D-flow was used to investigate the problem numerically. Simulations on a NACA 0009 hydrofoil with varying inflow velocity, angle of attack, and bevel angle were done. The content in this paper is a summary of the work done by the author during his MSc Individual Project at University College London (Johannessen, MSc thesis, 2020).","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129780329","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
Marine Applications of Plastic Piping – Requirements and Market Review 塑料管道的船舶应用。要求和市场评论
Day 3 Fri, October 29, 2021 Pub Date : 2021-10-18 DOI: 10.5957/smc-2021-025
Kevin Hein
{"title":"Marine Applications of Plastic Piping – Requirements and Market Review","authors":"Kevin Hein","doi":"10.5957/smc-2021-025","DOIUrl":"https://doi.org/10.5957/smc-2021-025","url":null,"abstract":"Plastic piping has become more common onboard marine vessels, but plastics have additional requirements over metallic piping materials. While plastics offer superior corrosion resistance and weight savings over metals these benefits must be weighed against the effect of fire on plastic piping. These requirements vary based on system, location, and regulatory ruleset which can cause confusion when discussing the application. This paper attempts to clearly summarize the requirements as well as highlight some of the benefits and weaknesses of various plastic piping materials.","PeriodicalId":243899,"journal":{"name":"Day 3 Fri, October 29, 2021","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129189787","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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