Journal of Marine Science and Technology最新文献_第5页

A study on vibration-suppression mechanism for risers using flexible structural joints 使用柔性结构连接的立管振动抑制机制研究

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-01-02 DOI: 10.1007/s00773-023-00977-y

Tomo Fujiwara

{"title":"A study on vibration-suppression mechanism for risers using flexible structural joints","authors":"Tomo Fujiwara","doi":"10.1007/s00773-023-00977-y","DOIUrl":"https://doi.org/10.1007/s00773-023-00977-y","url":null,"abstract":"<p>These new mechanisms for suppressing vibration in large diameter intake pipes and pumping systems has been developed for use in Floating Liquefied Natural Gas (FLNG) facilities. Like existing devices such as fairings and strakes, this mechanism is designed for practical use and has a flow path inside the pipe. The mechanism is designed to suppress vibration caused by both float motion and vortex-induced vibration (VIV) due to currents. Experiments were conducted using a scale model, and numerical calculations were used to evaluate the mechanism’s ability to reduce vibration. As a result, the natural frequencies of the pipes were analyzed, and it was found that the vibration damping mechanism, when installed at appropriate locations, can provide effective vibration suppression against the motion of the upper float and vibration caused by VIV due to currents over the entire length of the pipe, even at limited installation locations. On the other hand, it was found that the vibration suppression effect could not be achieved without appropriate positioning, and that the longer the pipe length, the more limited the vibration damping capability.</p>","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139079896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Numerical Investigation into the Influence of Bionic Ridge Structures on the Cavitation Performance of Marine Propellers 仿生脊结构对船用螺旋桨气蚀性能影响的数值研究

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2024-01-02 DOI: 10.1007/s00773-023-00976-z

Jie Yang, Hongtao Gao, Yuying Yan

{"title":"A Numerical Investigation into the Influence of Bionic Ridge Structures on the Cavitation Performance of Marine Propellers","authors":"Jie Yang, Hongtao Gao, Yuying Yan","doi":"10.1007/s00773-023-00976-z","DOIUrl":"https://doi.org/10.1007/s00773-023-00976-z","url":null,"abstract":"<p>With the development of the large and high-speed ships, the cavitation and radiated noise of marine propellers have been more and more concerned. This paper presents a numerical simulation of marine propellers with the ridge structures, inspired by the airfoils with the bionic ridge surfaces. The bionic method is applied to redesign the blade sections of a marine propeller, and the ridge structures are arranged between the leading edge and the thickest point. Four bionic propellers are established by changing the style and distribution area of the ridge structures on the blade surface. The cavitation morphology, pressure distribution and open water characteristics are analyzed with the software STAR CCM + . The numerical model is validated with the test data and the results show that the ridged structures can make the low-pressure area on the blade surface more dispersed and suppress cavitation. Compared with the prototype propeller, the four bionic propellers with the ridge structures can reduce the cavitation area by 26% (with an advance speed coefficient of 0.5) to 30% (with an advance speed coefficient of 0.3) at medium and low advance speeds. Besides, one of the bionic propellers can improve the thrust and efficiency by 14.93% and 1.61% respectively at high advance speeds.</p>","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"20 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139079593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Machine Learning with Multi-Source Data to Predict and Explain Marine Pilot Occupational Accidents 利用多源数据进行机器学习，预测和解释海洋飞行员职业事故

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-12-15 DOI: 10.51400/2709-6998.2709

Gokhan Camliyurt, Youngsoo Park, Daewon Kim, Won Sik Kang, Sangwon Park

引用次数: 0

A PRELIMINARY STUDY ON FLOATING FLEXIBLE OTEC COLD WATER PIPE 关于浮动柔性奥泰克冷水管的初步研究

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-12-15 DOI: 10.51400/2709-6998.2710

Nai Kuang Liang, H. Peng

引用次数: 0

Evaluation of Operational Performance of Wusongkou Cruise Port Through Network Data Envelopment Analysis 通过网络数据包络分析评估吴淞口邮轮港的运营绩效

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-12-15 DOI: 10.51400/2709-6998.2708

Qianfeng Wang, Guo-Ya Gan, Xin-Liang Ye, Hsuan-Shih Lee

引用次数: 0

Linear and nonlinear analyses of the porpoising dynamics of high-speed planing craft using full-scale trial data 基于全尺寸试验数据的高速刨床船的动态线性和非线性分析

IF 2.6 4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-11-29 DOI: 10.1007/s00773-023-00972-3

Satoru Hamada, Atsuo Maki

引用次数: 0

Analysis of submerged vehicle wakes in stratified ocean 分层海洋水下航行器尾迹分析

4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-11-13 DOI: 10.1007/s00773-023-00961-6

Dawei Li, Kaibo Yu, Xiao Wang, Hang Sun

引用次数: 0

RAO-based translation process for estimating extreme value distribution of nonlinear ship response in irregular waves 不规则波浪中船舶非线性响应极值分布估计的基于rao的平移方法

4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-11-11 DOI: 10.1007/s00773-023-00973-2

Sadaoki Matsui, Masayoshi Oka

{"title":"RAO-based translation process for estimating extreme value distribution of nonlinear ship response in irregular waves","authors":"Sadaoki Matsui, Masayoshi Oka","doi":"10.1007/s00773-023-00973-2","DOIUrl":"https://doi.org/10.1007/s00773-023-00973-2","url":null,"abstract":"Abstract The authors propose a new method named the RAO-based Translation Process (RTP) method for simply estimating the extreme value distribution of the nonlinear ship response in irregular waves based on the nonlinear response in regular waves. The proposed method combines the existing idea of the Nonlinear Correction (NLC) method, which is based on wave height-dependent RAO, with the theory of the translation process, and thus has both simplicity and a clear theoretical background. Furthermore, it is positioned as an extension of the Equivalent Design Wave (EDW) method used in conventional ship structural design. The validity of the proposed method is confirmed through a numerical study on the extreme value distribution of hull-girder sectional forces considering body nonlinear effects. The proposed method can be used for various purposes, and in particular, it can reduce the computational demand for strength evaluation by Direct Load and Structure Analysis (DLSA), which is a computationally extensive analysis method. Therefore, the proposed method is expected to make a significant contribution to structural design.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"22 15","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135041688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modelling and high-gain adaptive control of chaotic yawing of ship under wave disturbance 波浪扰动下船舶混沌偏航建模及高增益自适应控制

4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-11-06 DOI: 10.1007/s00773-023-00970-5

Xu Han, Xianku Zhang

引用次数: 0

Reliability assessment of the ocean thermal energy conversion systems through Monte Carlo simulation considering outside temperature variation 考虑外部温度变化的海洋热能转换系统可靠性蒙特卡罗模拟评估

4区工程技术

Journal of Marine Science and Technology Pub Date : 2023-11-06 DOI: 10.1007/s00773-023-00967-0

Amir Ghaedi, Reza Sedaghati, Mehrdad Mahmoudian, Eduardo M. G. Rodrigues, Radu Godina

{"title":"Reliability assessment of the ocean thermal energy conversion systems through Monte Carlo simulation considering outside temperature variation","authors":"Amir Ghaedi, Reza Sedaghati, Mehrdad Mahmoudian, Eduardo M. G. Rodrigues, Radu Godina","doi":"10.1007/s00773-023-00967-0","DOIUrl":"https://doi.org/10.1007/s00773-023-00967-0","url":null,"abstract":"Abstract The ocean thermal energy conversion (OTEC) systems, as renewable energy-based power plants, have the potential to play a significant role in meeting future electricity demands due to the vast expanse of the world's oceans. These systems employ the temperature difference between surface ocean waters and deep ocean waters to drive a thermodynamic cycle and produce electricity. The temperature of deep ocean waters, approximately 1000 m below the surface, is approximately 4 °C, while surface ocean temperatures typically range between 20 and 30 °C. The generated power of OTEC systems is dependent on these temperature differences and may vary with changes in surface ocean temperatures. In this study, the main focus is to find the impact of temperature variation on the failure rates of OTEC system components and the generated power output of these plants. The findings indicate that as the demand for the power system increases, its reliability decreases. In order to improve the reliability of the power system, the integration of a new generation unit, such as the close cycle OTEC power plant under investigation, could be necessary. The findings also indicate the importance of considering temperature variation in the evaluation of the reliability of such types of power plants based on renewable energy.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135634067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0