Marine Structures最新文献_第3页

Tendon fatigue analysis of tension leg platform using a new time-domain quasi-dynamic method 使用新型时域准动态方法分析拉伸腿平台的肌腱疲劳问题

IF 4 2区工程技术

Marine Structures Pub Date : 2024-10-04 DOI: 10.1016/j.marstruc.2024.103701

Binbin Li , Wei Huang , Xiaobo Chen

{"title":"Tendon fatigue analysis of tension leg platform using a new time-domain quasi-dynamic method","authors":"Binbin Li , Wei Huang , Xiaobo Chen","doi":"10.1016/j.marstruc.2024.103701","DOIUrl":"10.1016/j.marstruc.2024.103701","url":null,"abstract":"<div><div>Due to the non-Gaussian characteristics of the tendon tension response of tension leg platform (TLP), the common statistical model is not adequate to estimate the fatigue damage accurately in the frequency domain, thus the time domain analysis is required. A new quasi-dynamic method is proposed to calculate the tendon tension response considering various factors. An equivalent analytical tendon model is employed and the post-treatment has been carried out for the reconstruction of the high-frequency stress response based on the vertical motion QTFs of each tendon by HydroSTAR. Forty sets of environmental cases are extracted from a scatter diagram. The rainflow counting method is applied to deal with the stress time series and the fatigue damage can be obtained combined with the relevant S-N curve. The number of cycles of tension for each tendon is discussed, considering the contribution of the first-order wave load, the second-order diff-frequency wave load, and the second-order sum-frequency wave load. The comparison of annual fatigue damage based on the quasi-dynamic method and coupled method by Orcaflex is carried out. The study proves that the quasi-dynamic method is an efficient way to estimate the fatigue life of each tendon in the time domain considering numerous cases of discrete sea states.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"99 ","pages":"Article 103701"},"PeriodicalIF":4.0,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Experimental investigation of nonlinear springing of ultra-large container ship in regular waves 超大型集装箱船在规则波浪中的非线性弹跳实验研究

IF 4 2区工程技术

Marine Structures Pub Date : 2024-10-04 DOI: 10.1016/j.marstruc.2024.103697

Hailong Si , Chao Tian , Jun Yang , Yanchao Geng , Nan Zhao , Jiajun Hu , Junhua Zhan

{"title":"Experimental investigation of nonlinear springing of ultra-large container ship in regular waves","authors":"Hailong Si , Chao Tian , Jun Yang , Yanchao Geng , Nan Zhao , Jiajun Hu , Junhua Zhan","doi":"10.1016/j.marstruc.2024.103697","DOIUrl":"10.1016/j.marstruc.2024.103697","url":null,"abstract":"<div><div>The issue of ship structural fatigue strength caused by springing is receiving increasing attention from designers. To investigate nonlinear springing more precisely on ultralarge container ships that have large-opening structural characteristics, a new segmented ship model with a U-shaped backbone was designed and fabricated in this paper. The novel U-shaped backbone can simultaneously simulate the vertical, horizontal, and torsional stiffnesses as well as the shear center of a full-scale container ship. Measurements of the vertical and horizontal bending moments of the ship model were achieved by assessing the corresponding bending strains of the U-shaped backbone. Integration of the shear flow method was developed for direct measurements of torsional moments. This method was validated through the calibration of the U-shaped backbone. On the basis of the new segmented ship model, vertical, horizontal, and torsional nonlinear springing tests were conducted successfully for the 20000 TEU container ship in the seakeeping basin of the CSSRC, and their characteristics and mechanisms were investigated. The test results reveal that nonlinear springing is a special case of high-frequency vibration that is induced by the harmonic excitation force. The resonance frequency component of the vertical bending moment of the midship is almost 2.5–4.5 times the corresponding wave frequency component when the ship experiences double-frequency vertical nonlinear springing at high speed under different wave headings. The severity of torsional nonlinear springing is not as pronounced as that of vertical nonlinear springing.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"99 ","pages":"Article 103697"},"PeriodicalIF":4.0,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Numerical assessment of marine hose load response during reeling and free-hanging operations under Ocean waves 对海洋波浪下卷绕和自由悬挂作业期间的海洋软管负载响应进行数值评估

IF 4 2区工程技术

Marine Structures Pub Date : 2024-10-02 DOI: 10.1016/j.marstruc.2024.103698

Chiemela Victor Amaechi , Ahmed Reda , Mohamed A. Shahin , Charles Agbomerie Odijie , Salmia Binti Beddu , Daud bin Mohamad , Agusril Syamsir , Idris Ahmed Ja'e , Xuanze Ju

{"title":"Numerical assessment of marine hose load response during reeling and free-hanging operations under Ocean waves","authors":"Chiemela Victor Amaechi , Ahmed Reda , Mohamed A. Shahin , Charles Agbomerie Odijie , Salmia Binti Beddu , Daud bin Mohamad , Agusril Syamsir , Idris Ahmed Ja'e , Xuanze Ju","doi":"10.1016/j.marstruc.2024.103698","DOIUrl":"10.1016/j.marstruc.2024.103698","url":null,"abstract":"<div><div>In recent times, the need for sustainable fluid transfer has necessitated the application of bonded hoses and composite risers. It has been considered increasingly within the marine-offshore industry, with advances in loading/offloading operations, and newer offshore platforms. This paper presents a reeling study under different operational and environmental conditions. In this study, finite element modelling (FEM) was used for the design of marine bonded reeling hoses, and two wave spectra were applied to two reeling hose operations. The design assessed the load response of the marine bonded hoses during two different operations, including free-hanging (static) and reeling (dynamic/loading), and assessments were made for reinforced and mainline hoses. The findings aid an understanding on the load response, tension profiles, stress profiles, strain distribution and hose curvature of marine reeling hoses. The study showed different fluid contents affect the performance of the hose differently parametrically. It justifies the use of design specifications for reeling hose under the operation modes for marine application. The recommendations obtained from this study can assist in developing standards and guidance for use by marine hose designers and manufacturers.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"99 ","pages":"Article 103698"},"PeriodicalIF":4.0,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiple-arc cylinder under flow: Vortex-induced vibration and energy harvesting 流动下的多弧圆柱体：涡流诱导振动和能量收集

IF 4 2区工程技术

Marine Structures Pub Date : 2024-10-01 DOI: 10.1016/j.marstruc.2024.103699

Rui Zhang , Lianzhong Huang , Kai Wang , Ranqi Ma , Zhang Ruan , Tian Lan , Boyang Li , Baoshou Zhang

{"title":"Multiple-arc cylinder under flow: Vortex-induced vibration and energy harvesting","authors":"Rui Zhang , Lianzhong Huang , Kai Wang , Ranqi Ma , Zhang Ruan , Tian Lan , Boyang Li , Baoshou Zhang","doi":"10.1016/j.marstruc.2024.103699","DOIUrl":"10.1016/j.marstruc.2024.103699","url":null,"abstract":"<div><div>The shape of a cylindrical cross-section affects the vibrational performance. The vortex-induced vibration (VIV) phenomena of multiple-arc cylinders were numerically investigated to assess their impact on hydrodynamic energy harvesting and potential vibration suppression across a flow velocity range of 0.2 m/s to 1.4 m/s (1.767 × 10<sup>4</sup><<em>R</em>e < 1.237 × 10<sup>5</sup>). The study involves five types of multiple-arc cylinders: 4-arc, 8-arc, 16-arc, 24-arc, and circular cylinders. The accuracy of the numerical method was validated through comparison with experimental data. Specifically, increasing the number of arcs generally enhances overall energy conversion efficiency. Then, the VIV response and energy conversion results of the 24-arc cylinder are similar to those of the circular cylinder with maximum efficiency. Notably, the 4-arc cylinder achieves a global maximum amplitude of 0.074 m (<em>A</em>∗ = 0.83) and a power output of 4.4 W with the new P + T mode, making it the most effective configuration for flow velocities between 0.7 and 0.9 m/s. For vibration suppression of multiple-arc cylinders, the appropriate arc structure effectively reduces amplitudes. The small vortices generated by the arc structures disrupt the separation of normal vortices from the boundary layer, leading to approximately a 50 % reduction in amplitude responses for 8-arc and 16-arc cylinders.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"99 ","pages":"Article 103699"},"PeriodicalIF":4.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Analysis of tubular joints in marine structures: A comprehensive review 海洋结构中的管状连接分析：全面回顾

IF 4 2区工程技术

Marine Structures Pub Date : 2024-09-28 DOI: 10.1016/j.marstruc.2024.103702

Esmaeil Zavvar , Paulo Rosa-Santos , Elyas Ghafoori , Francisco Taveira-Pinto

{"title":"Analysis of tubular joints in marine structures: A comprehensive review","authors":"Esmaeil Zavvar , Paulo Rosa-Santos , Elyas Ghafoori , Francisco Taveira-Pinto","doi":"10.1016/j.marstruc.2024.103702","DOIUrl":"10.1016/j.marstruc.2024.103702","url":null,"abstract":"<div><div>The use of tubular joints (TJs) is evident, although they are commonly utilized in different areas, such as buildings, bridges, offshore structures, and renewable energy structures. Many studies have been conducted on TJs to better understand their behavior from different perspectives, namely using the Stress Concentration Factor (SCF), Hot-Spot Stress (HSS), Fatigue, Stress Intensity Factor (SIF), Degree of Bending (DoB), Local Joint Flexibility (LJF), among others. This paper reviews the experimental and numerical studies published in Web of Science from 1965 until 2024. Several studies have been considered in order to enhance comprehension and summarize existing design guidelines, recommendations, and codes. It was found that single-planar joints had more interest among scholars, especially T, Y, and K-joints, therefore, multi-planar joints need extensive investigations. In addition, the most common studied loadings are axial, in-plane bending, and out-of-plane bending. Hence, to have more accurate results, it is suggested to direct future research to modeling and analysis of the whole platform under environmental conditions.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"99 ","pages":"Article 103702"},"PeriodicalIF":4.0,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A study on the mechanical behavior of umbilical cables under impact loads using experimental and numerical methods 利用实验和数值方法研究冲击载荷下脐带缆的机械行为

IF 4 2区工程技术

Marine Structures Pub Date : 2024-09-27 DOI: 10.1016/j.marstruc.2024.103700

Yandong Mao , Zhixun Yang , Gang Wang , Jinlong Chen , Jun Yan , Zexuan Wang

{"title":"A study on the mechanical behavior of umbilical cables under impact loads using experimental and numerical methods","authors":"Yandong Mao , Zhixun Yang , Gang Wang , Jinlong Chen , Jun Yan , Zexuan Wang","doi":"10.1016/j.marstruc.2024.103700","DOIUrl":"10.1016/j.marstruc.2024.103700","url":null,"abstract":"<div><div>Accidental impacts affect the structural integrity of umbilical cables during their life cycle. This study investigates the impact behavior of a steel tube umbilical cable using both experimental tests and numerical simulations. A series of impact tests are carried out to elucidate the failure modes and deformation responses of non-bonded multi-layer components. A three-dimensional finite element model is established and verified to capture time-history responses. Through the analysis of time-history responses, the impact energy dissipation mechanisms are investigated, and the impact resistance of armor layers is further evaluated. It is found that the armor layers and polymer sheaths dissipate only approximately one-third of the impact energy, demonstrating limited protection capability, while more impact energy is absorbed by internal functional components. The steel tube may have sustained severe damage, even though the armor layer and polymer sheath exhibit only minor damage. This work has provided a reference for the damage assessment and protection design of umbilical cables.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"99 ","pages":"Article 103700"},"PeriodicalIF":4.0,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Numerical and experimental investigation on active hydraulic tensioner system for a TLP under tether fails condition 系绳失效条件下 TLP 的主动液压拉伸器系统的数值和实验研究

IF 4 2区工程技术

Marine Structures Pub Date : 2024-09-15 DOI: 10.1016/j.marstruc.2024.103693

Jianwei Wang , Xuchu Liu , Jiachen Chai , Yuqing Wang , Xiaofan Jin , Ze He , Wei Cai , Rui Guo

{"title":"Numerical and experimental investigation on active hydraulic tensioner system for a TLP under tether fails condition","authors":"Jianwei Wang , Xuchu Liu , Jiachen Chai , Yuqing Wang , Xiaofan Jin , Ze He , Wei Cai , Rui Guo","doi":"10.1016/j.marstruc.2024.103693","DOIUrl":"10.1016/j.marstruc.2024.103693","url":null,"abstract":"<div><p>In this paper, a new active control system for hydraulic tensioners is proposed. Based on the three-dimensional potential flow theory, the dynamic response of TLP-riser-tensioner under tether fails is studied. It is found that when the tension-leg platform’ tethers fail instantaneously, not only the six-degree-of-freedom motion response of TLP will change, but also the tension 'jump' phenomenon will occur in the tension-riser (TTR). The experiment of the active control scheme based on the platform motion response is designed, and the stability of tension output of hydraulic tensioner under normal working conditions is verified by scale model experiment. Based on the joint simulation of AMESim and Simulink, the designed active hydraulic tensioner and its control strategy are effective for the tension control under the condition of second-order wave force failure. In the case of tethers fail, the fuzzy PID control method of active hydraulic tensioner designed in this paper has stronger robustness than the traditional PID control method.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"99 ","pages":"Article 103693"},"PeriodicalIF":4.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0951833924001217/pdfft?md5=da7f6e65a43c3306a2c07e9fcbad831c&pid=1-s2.0-S0951833924001217-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142233752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of internal defects in flush ground butt welds in marine structures 评估海洋结构中齐平地面对接焊缝的内部缺陷

IF 4 2区工程技术

Marine Structures Pub Date : 2024-09-11 DOI: 10.1016/j.marstruc.2024.103696

Inge Lotsberg

{"title":"Assessment of internal defects in flush ground butt welds in marine structures","authors":"Inge Lotsberg","doi":"10.1016/j.marstruc.2024.103696","DOIUrl":"10.1016/j.marstruc.2024.103696","url":null,"abstract":"<div><p>In this paper, acceptance criteria of internal planar defects for the highest design S-N curve for surface ground butt welds in fatigue design standards has been assessed based on fatigue tests of tethers containing internal defects. The results from crack growth analysis from defects placed close to the surface are compared with test data from constant amplitude testing of tethers with circumferential welds that includes flaws or small planar defects close to the surface. Floating structures and support structures are subjected to variable loads and the calculated response leads to a long-term stress range distribution with many small stress ranges. This means that if the cracks are small, the resulting stress intensity may be less than the threshold stress intensity factor and the crack does not grow for this stress cycle, or it grows at a reduced crack growth rate in the near threshold region. A methodology to account for this is presented based on a two-parameter Weibull long-term stress range distribution that is representative for load response of floating structures and for support structures for wind turbines. It is shown that the threshold value and the reduced crack growth rate in the near threshold region for small internal defect heights can be used to lift the fatigue test data from constant amplitude testing to be in better correspondence with a higher S-N curve when considering an actual long-term loading.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"99 ","pages":"Article 103696"},"PeriodicalIF":4.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0951833924001242/pdfft?md5=c245ce826f2f883b5717b98b652dcbe1&pid=1-s2.0-S0951833924001242-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142167377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polyester mooring system design and evaluation of a semi-platform in south China sea 中国南海半平台聚酯系泊系统的设计与评估

IF 4 2区工程技术

Marine Structures Pub Date : 2024-09-08 DOI: 10.1016/j.marstruc.2024.103686

Jingrui Zhao , Sean Bian , Zhishuai Liu , Xiang Lin

{"title":"Polyester mooring system design and evaluation of a semi-platform in south China sea","authors":"Jingrui Zhao , Sean Bian , Zhishuai Liu , Xiang Lin","doi":"10.1016/j.marstruc.2024.103686","DOIUrl":"10.1016/j.marstruc.2024.103686","url":null,"abstract":"<div><p>Polyester rope offers numerous advantages over traditional steel catenary mooring systems and is considered an appealing option for deep-water mooring systems. In this paper, the design and evaluation procedure of the polyester mooring system for a semi-submersible platform located in the South China Sea is presented. A fully coupled numerical model of the semi-submersible platform, including all risers and mooring lines, has been established and calibrated through wave basin testing. To simulate the elongation behavior of polyester, a static-dynamic stiffness model is employed, and the corresponding procedure for mooring evaluation is established to simulate the mooring response under extreme environmental conditions. A comprehensive fatigue analysis is also conducted for the polyester mooring system using time domain dynamic theory. The effects of Vortex-Induced Motion (VIM) on mooring fatigue damage are also considered. The results indicate that the polyester mooring system could be safely operated at the target offshore field throughout its service life. Additionally, model test calibration is a crucial procedure during the entire mooring evaluation process, and the numerical model should be adjusted appropriately to accurately reflect the dynamic behavior of the coupled system. This study also illustrates that the stiffness of the rope plays a crucial role in polyester mooring design and global performance calculations. The proposed evaluation methodology can provide a foundation for the design of polyester mooring systems and for evaluating their safety and reliability in engineering practice.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"99 ","pages":"Article 103686"},"PeriodicalIF":4.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S095183392400114X/pdfft?md5=92a28346c33576dbea09f15f007502fd&pid=1-s2.0-S095183392400114X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142163550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrosion-fatigue damage identification in submerged mooring chain links using remote acoustic emission monitoring 利用远程声发射监测识别水下系泊链节的腐蚀疲劳损伤

IF 4 2区工程技术

Marine Structures Pub Date : 2024-08-31 DOI: 10.1016/j.marstruc.2024.103685

Filippo Riccioli , Øystein Gabrielsen , Ingrid Skutle Høgsæt , Pedro Silva Barros , Lotfollah Pahlavan

引用次数: 0