Journal of Ocean Engineering and Science最新文献_第4页

A systematic review of state-of-the-art technologies for monitoring plastic seafloor litter 对监测海底塑料垃圾的最新技术进行系统回顾

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2023-07-22 DOI: 10.1016/j.joes.2023.07.004

Matthias Sandra , Lisa I. Devriese , Andy M. Booth , Bavo De Witte , Gert Everaert , Jesus Gago , Francois Galgani , Kobus Langedock , Amy Lusher , Thomas Maes , Hans Pirlet , Josie Russell , Christopher K. Pham

Plastic litter has been widely documented in our oceans, leading to growing worldwide concerns regarding its potential impact on the marine environment. A large proportion of this plastic accumulates at the bottom of the ocean, resulting in a need to monitor and quantify seafloor litter. Seafloor litter monitoring is mostly performed using benthic beam trawls, which have several limitations and environmental implications. New innovative ways to document and address seafloor litter are therefore necessary and requested by the United Nations Sustainable Development Goal 14 (SDG 14.1.1b), the Oslo Paris Convention (OSPAR) and the International Council for the Exploration of the Sea (ICES). This systematic review gives an overview of the state-of-the-art of 14 current underwater technologies that are eligible for future in situ detection of plastic litter on the seafloor based on 101 publications. A set of objectives and a Technology Readiness Level (TRL) scale were used to benchmark the technologies and revealed that the most suitable system is often very scenario-specific and, therefore, demands investments in more than one specific group of technologies. A decision tool was established to determine the most suitable technique for a range of different situations. This review indicates that most of these technologies are currently at low-middle TRLs, requiring several more development, testing and commercialization steps before they can be applied effectively in marine field conditions. However, these technologies, alone or in combination, have the potential to contribute to the establishment of more robust global environmental indicators and monitoring programs for plastic pollution.

塑料垃圾在我们的海洋中被广泛记录，导致全球越来越关注其对海洋环境的潜在影响。这种塑料的很大一部分积聚在海底，因此需要对海底垃圾进行监测和量化。海底垃圾监测主要是使用底栖梁拖网进行的，这有一些限制和环境影响。因此，联合国可持续发展目标14 （SDG 14.1.1b）、《奥斯陆-巴黎公约》（OSPAR）和国际海洋探索理事会（ICES）要求采用新的创新方法记录和处理海底垃圾，这是必要的。本系统综述概述了基于101份出版物的14项当前水下技术的最新进展，这些技术可用于未来海底塑料垃圾的原位检测。一组目标和技术准备水平（TRL）规模用于对技术进行基准测试，并揭示出最合适的系统通常是非常特定于场景的，因此，需要在多个特定的技术组中进行投资。建立了一个决策工具，以确定最适合各种不同情况的技术。这一综述表明，大多数这些技术目前处于中低trl水平，需要更多的开发、测试和商业化步骤，才能有效地应用于海洋油田条件。然而，这些技术，单独或结合起来，有可能有助于建立更强大的全球环境指标和塑料污染监测计划。

{"title":"A systematic review of state-of-the-art technologies for monitoring plastic seafloor litter","authors":"Matthias Sandra , Lisa I. Devriese , Andy M. Booth , Bavo De Witte , Gert Everaert , Jesus Gago , Francois Galgani , Kobus Langedock , Amy Lusher , Thomas Maes , Hans Pirlet , Josie Russell , Christopher K. Pham","doi":"10.1016/j.joes.2023.07.004","DOIUrl":"10.1016/j.joes.2023.07.004","url":null,"abstract":"<div><div>Plastic litter has been widely documented in our oceans, leading to growing worldwide concerns regarding its potential impact on the marine environment. A large proportion of this plastic accumulates at the bottom of the ocean, resulting in a need to monitor and quantify seafloor litter. Seafloor litter monitoring is mostly performed using benthic beam trawls, which have several limitations and environmental implications. New innovative ways to document and address seafloor litter are therefore necessary and requested by the United Nations Sustainable Development Goal 14 (SDG 14.1.1b), the Oslo Paris Convention (OSPAR) and the International Council for the Exploration of the Sea (ICES). This systematic review gives an overview of the state-of-the-art of 14 current underwater technologies that are eligible for future in situ detection of plastic litter on the seafloor based on 101 publications. A set of objectives and a Technology Readiness Level (TRL) scale were used to benchmark the technologies and revealed that the most suitable system is often very scenario-specific and, therefore, demands investments in more than one specific group of technologies. A decision tool was established to determine the most suitable technique for a range of different situations. This review indicates that most of these technologies are currently at low-middle TRLs, requiring several more development, testing and commercialization steps before they can be applied effectively in marine field conditions. However, these technologies, alone or in combination, have the potential to contribute to the establishment of more robust global environmental indicators and monitoring programs for plastic pollution.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 6","pages":"Pages 879-896"},"PeriodicalIF":11.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48437503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Evaluating hydrothermal degradation of GFRP composites under sustained loading using explainable machine learning 使用可解释的机器学习评估GFRP复合材料在持续载荷下的水热降解

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2025-05-30 DOI: 10.1016/j.joes.2025.05.005

Mudassir Iqbal , Xiao-Ling Zhao , Hui Li , Daxu Zhang , Pei-Fu Zhang , Xuan Zhao , Congshui Yu

The understanding of GFRP composites under hydrothermal conditions and sustained loading offers valuable insights into their performance in challenging environments such as coastal areas, deep-sea structures, and environmentally friendly and long-lasting infrastructure solutions. This study examined the mechanical response of GFRP composites subjected to synergic sustained loading and hydrothermal degradation. A prediction application based on the XGBoost machine learning model was developed to estimate the residual mechanical response. The developed model was used to calculate the conversion factor accounting for moisture and temperature-based degradation in FRP composites. The SHAP analysis corroborated the experimental findings such that GFRP-based composites experience an initial rapid decline in mechanical properties when exposed to harsh environments, followed by a slower degradation rate over time. The pultruded vinyl ester-based GFRP composites depict less degradation than polyester-based composites and composites made via vacuum infusion. It was inferred that sustained loading below 30 % has no negative impact on the mechanical characteristics of hydrothermal-aged GFRP composites. The degradation became worse for the sustained loading beyond 30% of the ultimate strength of the GFRP composite. Comments are also made on the current recommendations in technical specifications by the European Committee for Standardization CEN/TS 19101 related to moisture and temperature conversion factors. The current work is limited to the mechanical investigation of GFRP composites subjected to hydrothermal degradation. It needs to be extended to other composites such as CFRP and BFRP.

了解GFRP复合材料在热液条件和持续载荷下的性能，可以为其在沿海地区、深海结构以及环保和持久的基础设施解决方案等具有挑战性的环境中的性能提供有价值的见解。本研究考察了GFRP复合材料在协同持续载荷和水热降解下的力学响应。开发了基于XGBoost机器学习模型的预测应用程序来估计残余力学响应。建立的模型用于计算玻璃钢复合材料的湿度和温度基降解的转换因子。SHAP分析证实了实验结果，即gfrp基复合材料在暴露于恶劣环境时，其机械性能最初会迅速下降，随后随着时间的推移，降解速度会减慢。拉伸乙烯基酯基GFRP复合材料比聚酯基复合材料和真空灌注复合材料具有更小的降解性。由此推断，30%以下的持续载荷对水热老化GFRP复合材料的力学特性没有负面影响。当持续载荷超过GFRP复合材料极限强度的30%时，降解恶化。还对欧洲标准化委员会CEN/TS 19101技术规范中有关湿度和温度转换因子的当前建议进行了评论。目前的工作仅限于水热降解下GFRP复合材料的力学研究。它需要扩展到其他复合材料，如CFRP和BFRP。

{"title":"Evaluating hydrothermal degradation of GFRP composites under sustained loading using explainable machine learning","authors":"Mudassir Iqbal , Xiao-Ling Zhao , Hui Li , Daxu Zhang , Pei-Fu Zhang , Xuan Zhao , Congshui Yu","doi":"10.1016/j.joes.2025.05.005","DOIUrl":"10.1016/j.joes.2025.05.005","url":null,"abstract":"<div><div>The understanding of GFRP composites under hydrothermal conditions and sustained loading offers valuable insights into their performance in challenging environments such as coastal areas, deep-sea structures, and environmentally friendly and long-lasting infrastructure solutions. This study examined the mechanical response of GFRP composites subjected to synergic sustained loading and hydrothermal degradation. A prediction application based on the XGBoost machine learning model was developed to estimate the residual mechanical response. The developed model was used to calculate the conversion factor accounting for moisture and temperature-based degradation in FRP composites. The SHAP analysis corroborated the experimental findings such that GFRP-based composites experience an initial rapid decline in mechanical properties when exposed to harsh environments, followed by a slower degradation rate over time. The pultruded vinyl ester-based GFRP composites depict less degradation than polyester-based composites and composites made via vacuum infusion. It was inferred that sustained loading below 30 % has no negative impact on the mechanical characteristics of hydrothermal-aged GFRP composites. The degradation became worse for the sustained loading beyond 30% of the ultimate strength of the GFRP composite. Comments are also made on the current recommendations in technical specifications by the European Committee for Standardization CEN/TS 19101 related to moisture and temperature conversion factors. The current work is limited to the mechanical investigation of GFRP composites subjected to hydrothermal degradation. It needs to be extended to other composites such as CFRP and BFRP.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 6","pages":"Pages 982-1001"},"PeriodicalIF":11.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145469014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Passive flow control technique for enhancing power efficiency of vertical-axis wind turbines: Leading-edge slot structure 提高垂直轴风力机功率效率的被动流控技术：前缘槽结构

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2025-05-14 DOI: 10.1016/j.joes.2025.05.002

Rui Zhang , Lingyu Zhan , Limin Kuang , Redili Yushan , Yu Tu , Hongbo Zhu , Jie Su , Zhaolong Han , Dai Zhou

Vertical-axis wind turbines (VAWTs) are receiving growing interest in offshore wind energy exploitation. However, they often exhibit suboptimal energy conversion efficiency, particularly at low tip speed ratios (TSRs). One critical challenge is suppressing flow separation and dynamic stall on the blades. Passive flow control techniques have shown potential in improving blade aerodynamics, yet a simple and effective approach is still desired. This study proposes a novel leading-edge slot structure aimed at enhancing the power efficiency of VAWTs without additional energy input. The structure facilitates natural suction and blowing flows on the suction side of the blades. High-fidelity computational fluid dynamics simulations incorporating a transition shear stress transport model are employed to examine turbine aerodynamics. The power performance and aerodynamic loads of VAWTs with various slotted blade designs (different start locations, 0.02c ≤ x_I ≤ 0.31c, and end locations, 0.1c ≤ x_II ≤ 0.35c, where c denotes the blade chord length) are compared to identify the relatively optimal slot configuration. The analysis of blade boundary layer phenomena and flow state in the slot further elucidates the flow control mechanism. Results indicate that the leading-edge slot structure significantly enhances the power efficiency of the VAWT at low TSRs. The relatively optimal slot configuration (x_I = 0.16c, x_II = 0.2c) yields an average power increase of 38.33 % under studied operating conditions. Laminar separation bubble bursting is delayed or even eliminated for slotted blades at low and moderate TSRs. The leading-edge slot structure also delays trailing-edge separation, suppresses dynamic stall vortex formation, and reduces shedding vortex strength, thereby increasing the blade lift-to-drag ratio. This study would facilitate the blade design of VAWTs.

垂直轴风力涡轮机（VAWTs）在海上风能开发中受到越来越多的关注。然而，它们经常表现出次优的能量转换效率，特别是在低叶尖速比（tsr）下。一个关键的挑战是抑制流动分离和叶片的动态失速。被动流动控制技术在改善叶片空气动力学方面已经显示出潜力，但仍然需要一种简单有效的方法。本研究提出了一种新的前缘槽结构，旨在提高vawt的功率效率，而无需额外的能量输入。这种结构有利于叶片吸力侧的自然吸力和吹气流动。采用高保真计算流体动力学模拟，结合过渡剪应力输运模型对涡轮空气动力学进行了研究。对比不同开槽叶片设计（开始位置为0.02c≤xI≤0.31c，结束位置为0.1c≤xII≤0.35c，其中c为叶片弦长）的vawt的动力性能和气动载荷，确定相对最优的开槽构型。通过对叶片边界层现象和槽内流动状态的分析，进一步阐明了流动控制机理。结果表明，前缘槽结构显著提高了低tsr时VAWT的功率效率。在研究的工作条件下，相对最佳的槽位配置（xI = 0.16c, xII = 0.2c）的平均功率增加了38.33%。在中低tsr条件下，狭缝叶片可延迟甚至消除层流分离气泡的破裂。前缘槽结构还可以延缓尾缘分离，抑制动态失速涡的形成，降低脱落涡强度，从而提高叶片升阻比。本文的研究将为vawt叶片的设计提供参考。

{"title":"Passive flow control technique for enhancing power efficiency of vertical-axis wind turbines: Leading-edge slot structure","authors":"Rui Zhang , Lingyu Zhan , Limin Kuang , Redili Yushan , Yu Tu , Hongbo Zhu , Jie Su , Zhaolong Han , Dai Zhou","doi":"10.1016/j.joes.2025.05.002","DOIUrl":"10.1016/j.joes.2025.05.002","url":null,"abstract":"<div><div>Vertical-axis wind turbines (VAWTs) are receiving growing interest in offshore wind energy exploitation. However, they often exhibit suboptimal energy conversion efficiency, particularly at low tip speed ratios (TSRs). One critical challenge is suppressing flow separation and dynamic stall on the blades. Passive flow control techniques have shown potential in improving blade aerodynamics, yet a simple and effective approach is still desired. This study proposes a novel leading-edge slot structure aimed at enhancing the power efficiency of VAWTs without additional energy input. The structure facilitates natural suction and blowing flows on the suction side of the blades. High-fidelity computational fluid dynamics simulations incorporating a transition shear stress transport model are employed to examine turbine aerodynamics. The power performance and aerodynamic loads of VAWTs with various slotted blade designs (different start locations, 0.02<em>c</em> ≤ <em>x<sub>I</sub></em> ≤ 0.31<em>c</em>, and end locations, 0.1<em>c</em> ≤ <em>x<sub>II</sub></em> ≤ 0.35<em>c</em>, where <em>c</em> denotes the blade chord length) are compared to identify the relatively optimal slot configuration. The analysis of blade boundary layer phenomena and flow state in the slot further elucidates the flow control mechanism. Results indicate that the leading-edge slot structure significantly enhances the power efficiency of the VAWT at low TSRs. The relatively optimal slot configuration (<em>x<sub>I</sub></em> = 0.16<em>c, x<sub>II</sub></em> = 0.2<em>c</em>) yields an average power increase of 38.33 % under studied operating conditions. Laminar separation bubble bursting is delayed or even eliminated for slotted blades at low and moderate TSRs. The leading-edge slot structure also delays trailing-edge separation, suppresses dynamic stall vortex formation, and reduces shedding vortex strength, thereby increasing the blade lift-to-drag ratio. This study would facilitate the blade design of VAWTs.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 6","pages":"Pages 945-959"},"PeriodicalIF":11.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145469018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Investigation of methods for the localization and reconstruction of the wave impact on a floating wind turbine pontoon 浮式风力机浮桥波浪冲击定位与重建方法研究

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2025-08-19 DOI: 10.1016/j.joes.2025.08.006

Zhou Yang , Yuwang Xu , Liying Shi , Chaochao Zhu , Yichen Bao

Wave impact under extreme sea conditions poses significant risks to offshore structures, such as the pontoons of floating wind turbines. Monitoring the structures and inverting the impact loads are crucial for structural safety design. In this study, an indirect approach is proposed for the localization and reconstruction of waves impacting flat plates, curved plates and floating wind turbine pontoons. For impact load localization, the correlation dimension method and the long short-term memory (LSTM) neural network method are employed. The correlation dimension method achieves accurate localization results only for flat plates, whereas the LSTM method shows good performance for all structures. For load time history reconstruction, the Tikhonov regularization method is applied. Reconstruction is achieved with very high accuracy. This work can provide guidelines for inverse estimation of environmental loads acting on offshore structures.

极端海况下的波浪冲击对海上结构构成了重大风险，例如浮动风力涡轮机的浮桥。结构的监测和冲击荷载的反演是结构安全设计的关键。在本研究中，提出了一种间接的方法来定位和重建波浪冲击平板，弯曲板和浮式风力发电浮桥。针对冲击载荷定位，采用了相关维数法和长短期记忆神经网络方法。相关维数法仅对平面结构具有准确的定位结果，而LSTM方法对所有结构都具有较好的定位效果。对于载荷时程重建，采用了Tikhonov正则化方法。重建以非常高的精度实现。这项工作可以为作用在海上结构物上的环境荷载的逆估计提供指导。

引用次数: 0

2D CNN‐based multi‐feature fusion detection method for the magnetic anomaly generated by submarine wake 基于二维CNN的潜艇尾流磁异常多特征融合检测方法

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2023-11-07 DOI: 10.1016/j.joes.2023.11.001

Ran Hui , Xiaofeng Liang , Chao Zuo , Zuoshuai Wang

A Two-Dimensional Convolutional Neural Network (2D-CNN)-based multi-feature fusion detection method is proposed to improve the detection performance of the submarine wake magnetic anomaly in view of its characteristics of low frequency and low signal-to-noise ratio (SNR). The method involves pre-processing the original signal by using the Savitzky-Golay (S–G) filter, followed by Residual Structure processing to extract the time-domain information, FFT to extract the frequency domain information and Minimum-Entropy Filter (MEF) for noise analysis. The 2D-CNN model with three processing branches is utilised for further feature extraction and signal judgement. To train the method, Simulated target signal dataset is obtained through the submarine wake magnetic anomaly simulation model, and the simulated original signal is acquired by stacking measured noise. The proposed method exhibits great detection performance for signals with different Signal-to-Noise Ratios (SNRs) and various types of noise, achieving a recognition accuracy of 90% for signals with SNRs above -10dB. The theoretical detection range of the submarine has been increased to over 1 km, outperforming similar neural networks based on magnetic dipole models.

针对潜艇尾流磁异常频率低、信噪比低的特点，提出了一种基于二维卷积神经网络（2D-CNN）的多特征融合检测方法。该方法采用Savitzky-Golay （S-G）滤波器对原始信号进行预处理，然后进行残差结构处理提取时域信息，FFT提取频域信息，最小熵滤波（MEF）进行噪声分析。利用具有三个处理分支的2D-CNN模型进行进一步的特征提取和信号判断。为了训练该方法，通过潜艇尾流磁异常仿真模型获得模拟目标信号数据集，通过叠加实测噪声获得模拟原始信号。该方法对不同信噪比（SNRs）和不同类型噪声的信号具有良好的检测性能，对信噪比在-10dB以上的信号的识别准确率达到90%。潜艇的理论探测距离已增加到1公里以上，优于基于磁偶极子模型的类似神经网络。

{"title":"2D CNN‐based multi‐feature fusion detection method for the magnetic anomaly generated by submarine wake","authors":"Ran Hui , Xiaofeng Liang , Chao Zuo , Zuoshuai Wang","doi":"10.1016/j.joes.2023.11.001","DOIUrl":"10.1016/j.joes.2023.11.001","url":null,"abstract":"<div><div>A Two-Dimensional Convolutional Neural Network (2D-CNN)-based multi-feature fusion detection method is proposed to improve the detection performance of the submarine wake magnetic anomaly in view of its characteristics of low frequency and low signal-to-noise ratio (SNR). The method involves pre-processing the original signal by using the Savitzky-Golay (S–G) filter, followed by Residual Structure processing to extract the time-domain information, FFT to extract the frequency domain information and Minimum-Entropy Filter (MEF) for noise analysis. The 2D-CNN model with three processing branches is utilised for further feature extraction and signal judgement. To train the method, Simulated target signal dataset is obtained through the submarine wake magnetic anomaly simulation model, and the simulated original signal is acquired by stacking measured noise. The proposed method exhibits great detection performance for signals with different Signal-to-Noise Ratios (SNRs) and various types of noise, achieving a recognition accuracy of 90% for signals with SNRs above -10dB. The theoretical detection range of the submarine has been increased to over 1 km, outperforming similar neural networks based on magnetic dipole models.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 6","pages":"Pages 1139-1154"},"PeriodicalIF":11.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135509793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Torsional failure analysis of steel strip reinforced flexible pipes connected with end fittings 带端件连接的钢带增强挠性管扭转失效分析

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2025-08-20 DOI: 10.1016/j.joes.2025.08.005

Yuteng Zhang, Pan Fang, Mohsen Saneian, Wenshu Liu, Yong Bai, Liang Zhao

Flexible pipes function effectively in practical applications only when they are securely connected to specific components using specially designed end fittings. These end fittings must be precisely manufactured to ensure a tight connection, preventing any potential leakage. Otherwise, even perfectly manufactured flexible pipes will fail to perform their intended function. Although extensive research exists on the mechanical analysis of flexible pipes, studies on pipes connected to end fittings are scarce. The primary challenge in investigating this combined structure lies in the complex interaction between flexible pipes and end fittings after assembly, in addition to the already intricate structural behavior of flexible pipes. This paper presents both experimental and numerical analyses. Experimentally, we conducted comprehensive torsion tests on steel strip reinforced flexible pipes connected to commonly used end fittings, observing various torsional failure modes. On the numerical side, we developed a method to model the interaction between flexible pipes and end fittings. The proposed approach enables the prediction of torsional failure modes in practical applications and lays the groundwork for further failure analysis under different loading conditions and for various end fitting designs.

在实际应用中，柔性管只有在使用特殊设计的末端管件安全地连接到特定组件时才能有效地发挥作用。这些末端配件必须精确制造，以确保紧密连接，防止任何潜在的泄漏。否则，即使是完美制造的柔性管道也无法发挥其预期的功能。虽然对柔性管件的力学分析已经有了大量的研究，但对末端管件连接的柔性管件的研究却很少。研究这种组合结构的主要挑战在于，除了柔性管本身已经很复杂的结构行为外，装配后柔性管与末端管件之间的复杂相互作用。本文进行了实验和数值分析。实验中，我们对连接常用端件的钢带增强挠性管进行了综合扭转试验，观察了各种扭转破坏模式。在数值方面，我们开发了一种方法来模拟柔性管道和末端管件之间的相互作用。所提出的方法能够在实际应用中预测扭转失效模式，并为进一步分析不同载荷条件下的失效和各种端件设计奠定基础。

{"title":"Torsional failure analysis of steel strip reinforced flexible pipes connected with end fittings","authors":"Yuteng Zhang, Pan Fang, Mohsen Saneian, Wenshu Liu, Yong Bai, Liang Zhao","doi":"10.1016/j.joes.2025.08.005","DOIUrl":"10.1016/j.joes.2025.08.005","url":null,"abstract":"<div><div>Flexible pipes function effectively in practical applications only when they are securely connected to specific components using specially designed end fittings. These end fittings must be precisely manufactured to ensure a tight connection, preventing any potential leakage. Otherwise, even perfectly manufactured flexible pipes will fail to perform their intended function. Although extensive research exists on the mechanical analysis of flexible pipes, studies on pipes connected to end fittings are scarce. The primary challenge in investigating this combined structure lies in the complex interaction between flexible pipes and end fittings after assembly, in addition to the already intricate structural behavior of flexible pipes. This paper presents both experimental and numerical analyses. Experimentally, we conducted comprehensive torsion tests on steel strip reinforced flexible pipes connected to commonly used end fittings, observing various torsional failure modes. On the numerical side, we developed a method to model the interaction between flexible pipes and end fittings. The proposed approach enables the prediction of torsional failure modes in practical applications and lays the groundwork for further failure analysis under different loading conditions and for various end fitting designs.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 6","pages":"Pages 1086-1102"},"PeriodicalIF":11.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145469103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 study on dynamic characteristics of nodule particles in multi-field coupling during the Coandă-effect-based hydraulic collection 基于协同效应的水力集流过程中多场耦合中结核颗粒动态特性的实验研究

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2025-04-26 DOI: 10.1016/j.joes.2025.04.003

Zihan Liu , Yong Yang , Guocheng Zhao , Longfei Xiao

The Coandă-effect-based hydraulic collection, celebrated for its high pick-up efficiency, has become a focus in deep-sea mining. However, prevailing research mainly focused on the performance in clear water environments, overlooking the impact of seabed sediments. This experimental study aims to examine the dynamic characteristics of nodule particles within the "fluid-solid-soil" multi-field under Coandă-effect-based hydraulic collection. The sediments were simulated in the laboratory by mixing the bentonite and water in specific proportions to replicate the physical and mechanical properties of in-situ sediments. A detailed analysis was conducted on the mechanical and motion characteristics of particles under various jet parameters and sediment shear strengths. The results illuminated that the shear strength of the sediment predominantly influenced the soil adhesion force, exhibiting an approximately linear correlation. Subsequent to assessing the collection performance, a criterion for particle incipient motion was proposed, and an empirical formula was established for predicting the maximum lifting force and experimentally confirmed to possess a maximum error below 20%. The pick-up efficiency experiments further demonstrated that when the jet parameters aligned with the critical conditions delineated by using the empirical formula, there was a significant increase to nearly 100% in pick-up efficiency, underscoring the practicality and accuracy of the predictive model. The results can offer theoretical guidance for selecting optimal jet parameters, to ensure efficient collection while minimizing potential environmental impacts due to excessive hydrodynamic forces and sediment erosion.

基于协同效应的液压采集技术以其高采集效率而闻名，已成为深海采矿领域的研究热点。然而，目前的研究主要集中在清水环境下的性能，忽视了海底沉积物的影响。本实验旨在研究基于协同效应的水力收集下“流-固-土”多场中结核颗粒的动态特性。在实验室中，通过将膨润土与水按特定比例混合来模拟沉积物，以复制原位沉积物的物理力学特性。详细分析了不同射流参数和泥沙抗剪强度下颗粒的力学和运动特性。结果表明，泥沙的抗剪强度对土体黏附力的影响最大，表现为近似线性相关关系。在对收集性能进行评价的基础上，提出了颗粒初始运动判据，建立了预测最大举升力的经验公式，实验证实最大误差在20%以下。实验结果进一步表明，当射流参数与经验公式所描述的临界条件一致时，提取效率显著提高至接近100%，表明了预测模型的实用性和准确性。研究结果可以为选择最佳射流参数提供理论指导，以确保高效收集，同时最大限度地减少由于过大的水动力和泥沙侵蚀造成的潜在环境影响。

{"title":"Experimental study on dynamic characteristics of nodule particles in multi-field coupling during the Coandă-effect-based hydraulic collection","authors":"Zihan Liu , Yong Yang , Guocheng Zhao , Longfei Xiao","doi":"10.1016/j.joes.2025.04.003","DOIUrl":"10.1016/j.joes.2025.04.003","url":null,"abstract":"<div><div>The Coandă-effect-based hydraulic collection, celebrated for its high pick-up efficiency, has become a focus in deep-sea mining. However, prevailing research mainly focused on the performance in clear water environments, overlooking the impact of seabed sediments. This experimental study aims to examine the dynamic characteristics of nodule particles within the \"fluid-solid-soil\" multi-field under Coandă-effect-based hydraulic collection. The sediments were simulated in the laboratory by mixing the bentonite and water in specific proportions to replicate the physical and mechanical properties of in-situ sediments. A detailed analysis was conducted on the mechanical and motion characteristics of particles under various jet parameters and sediment shear strengths. The results illuminated that the shear strength of the sediment predominantly influenced the soil adhesion force, exhibiting an approximately linear correlation. Subsequent to assessing the collection performance, a criterion for particle incipient motion was proposed, and an empirical formula was established for predicting the maximum lifting force and experimentally confirmed to possess a maximum error below 20%. The pick-up efficiency experiments further demonstrated that when the jet parameters aligned with the critical conditions delineated by using the empirical formula, there was a significant increase to nearly 100% in pick-up efficiency, underscoring the practicality and accuracy of the predictive model. The results can offer theoretical guidance for selecting optimal jet parameters, to ensure efficient collection while minimizing potential environmental impacts due to excessive hydrodynamic forces and sediment erosion.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 6","pages":"Pages 916-928"},"PeriodicalIF":11.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145469119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Optimization of drag embedment anchors applying multi-objective evolutionary algorithm NSGA-II 基于NSGA-II多目标进化算法的拖曳嵌入锚点优化

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2025-07-28 DOI: 10.1016/j.joes.2025.07.002

Kacper Cerek, Elnaz Hadjiloo, Jürgen Grabe, Duy Anh Dao

Establishing renewables on a floating platform in the deep sea needs secure anchoring to the seabed, commonly achieved with drag embedment anchors (DEAs). The conventional design process relies heavily on empirical testing and is often time and resource-intensive, potentially leading to suboptimal designs. This research aims to overcome these limitations by applying an evolutionary optimization algorithm to existing analytical solutions for DEAs, identifying optimal anchor fluke and shank lengths. By leveraging an optimization strategy, we aim to enhance the design process while diminishing the dependency on exhaustive physical testing and high computational cost. We employ the Non-Dominated Sorting Genetic Algorithm II (NSGA-II) to optimize anchor shapes, with a focus on three key objectives: maximizing embedment depth and bearing capacity, and minimizing anchor volume. The methodology presents a Pareto front, encompassing all optimal solutions based on the formulated objectives, and demonstrates the efficiency of NSGA-II as a tool for optimizing anchor shapes.

在深海的浮动平台上建立可再生能源需要在海床上安全锚定，通常使用拖曳嵌入锚（dea）来实现。传统的设计过程严重依赖于经验测试，通常是时间和资源密集型的，可能导致次优设计。本研究旨在通过将进化优化算法应用于dea的现有解析解来克服这些局限性，确定最佳锚爪和杆长。通过利用优化策略，我们的目标是增强设计过程，同时减少对详尽的物理测试和高计算成本的依赖。我们采用非支配排序遗传算法II （NSGA-II）来优化锚形状，重点关注三个关键目标：最大化嵌入深度和承载能力，以及最小化锚体积。该方法呈现了一个帕累托前沿，包含了基于制定目标的所有最优解，并展示了NSGA-II作为优化锚形工具的效率。

{"title":"Optimization of drag embedment anchors applying multi-objective evolutionary algorithm NSGA-II","authors":"Kacper Cerek, Elnaz Hadjiloo, Jürgen Grabe, Duy Anh Dao","doi":"10.1016/j.joes.2025.07.002","DOIUrl":"10.1016/j.joes.2025.07.002","url":null,"abstract":"<div><div>Establishing renewables on a floating platform in the deep sea needs secure anchoring to the seabed, commonly achieved with drag embedment anchors (DEAs). The conventional design process relies heavily on empirical testing and is often time and resource-intensive, potentially leading to suboptimal designs. This research aims to overcome these limitations by applying an evolutionary optimization algorithm to existing analytical solutions for DEAs, identifying optimal anchor fluke and shank lengths. By leveraging an optimization strategy, we aim to enhance the design process while diminishing the dependency on exhaustive physical testing and high computational cost. We employ the Non-Dominated Sorting Genetic Algorithm II (NSGA-II) to optimize anchor shapes, with a focus on three key objectives: maximizing embedment depth and bearing capacity, and minimizing anchor volume. The methodology presents a Pareto front, encompassing all optimal solutions based on the formulated objectives, and demonstrates the efficiency of NSGA-II as a tool for optimizing anchor shapes.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 6","pages":"Pages 1019-1030"},"PeriodicalIF":11.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145469023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Self-motion of an ellipsoid with controllable rotation in potential flow 势流中可控旋转椭球体的自运动

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2025-05-23 DOI: 10.1016/j.joes.2025.05.003

Zeyu Zhang , Qi Su , Yarong Zhou , Ren Sun

The moving behaviors of a prolate spheroidal complex with the controllable rotation in an ideal fluid without vortex shedding are investigated to find out the self-propelled mechanism of a non-spherical swimmer via the self-controlled rotation coupled with shift of its internal mass. Based on the model, algebraic velocity vector equations for the complex are derived from the Kirchhoff equations. Several simple cases reveal that the single non-spherical body can push itself to move persistently forward to break the kinematic time-reversal symmetry through coupling the specially-appointed rotation with the corresponding cyclic shift of the internal mass, and some typical self-motion patterns such as trochoids in two dimensions and unidirectional spatial helical motions are identified. The study aims to provide a potential swimming manner of underwater vehicles.

研究了具有可控旋转的长形球体配合物在理想流体中无涡脱落的运动特性，探讨了非球形游泳体通过自我控制旋转和内部质量漂移实现游动的机理。在此基础上，由Kirchhoff方程导出了复体的速度矢量代数方程。几个简单的例子表明，单个非球面体可以通过耦合指定的旋转和相应的内部质量的周期位移来推动自身持续向前运动，从而打破运动学时间反转对称性，并确定了一些典型的自运动模式，如二维tro仿体和单向空间螺旋运动。本研究旨在为水下航行器提供一种潜在的游泳方式。

引用次数: 0

Nonlinear hydroelastic FSI model for stability analysis of foam sandwich beams under viscous water flow 粘性水流作用下泡沫夹层梁稳定性分析的非线性水弹性FSI模型

IF 11.8 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science

Pub Date : 2025-12-01 Epub Date: 2025-09-01 DOI: 10.1016/j.joes.2025.09.001

Ehsan Taati

Within the framework of an equivalent single-layer beam theory incorporating moderately large deformations at contact surface, a nonlinear hydroelastic fluid-structure interaction (FSI) model is developed to investigate the buckling and postbuckling behavior of foam sandwich beams in viscous flow. The sandwich beam is assumed to consist of two orthotropic face sheets and a metal foam core, with a symmetric porosity distribution along the thickness direction. For the first time, the nonlinear pressure distribution of incompressible viscous flow along the beam length is derived based on the exponential variation of velocity components through the thickness, the nonlinear impermeability condition, the continuity equation, and the Navier–Stokes equation. Then, Timoshenko beam equations with von Kármán’s geometric nonlinearity are solved via the Galerkin method, to present the closed-form expressions of static equilibrium paths (in both prebuckling and postbuckling regimes), buckling compressive load

(N_{a, c r})

, and critical upstream speed

(U_{\infty, c r})

. The numerical results indicate that the critical values are highly sensitive to the decay rate, therefore its accurate determination is crucial for understanding the effect of viscous flow on the mechanical behavior of foam sandwich beams. Furthermore, the findings reveal that the linear hydroelastic FSI model by neglecting the geometric nonlinearities is inadequate for predicting the buckling behavior.

在等效单层梁理论框架下，结合接触面的中等大变形，建立了非线性水弹性流固相互作用（FSI）模型，研究了泡沫夹层梁在粘性流动中的屈曲和后屈曲行为。假设夹层梁由两个正交各向异性面板和一个金属泡沫芯组成，沿厚度方向孔隙率分布对称。基于速度分量随厚度的指数变化、非线性抗渗条件、连续性方程和Navier-Stokes方程，首次推导了不可压缩粘性流动沿梁长方向的非线性压力分布。然后，通过Galerkin方法求解具有几何非线性的von Kármán Timoshenko梁方程，得到静力平衡路径（前屈曲和后屈曲状态）、屈曲压缩载荷（Na,cr）和临界上游速度（U∞,cr）的封闭表达式。数值计算结果表明，该临界值对衰减率非常敏感，因此其准确确定对于理解粘性流动对泡沫夹层梁力学性能的影响至关重要。此外，研究结果表明，忽略几何非线性的线性水弹性FSI模型不足以预测屈曲行为。

{"title":"Nonlinear hydroelastic FSI model for stability analysis of foam sandwich beams under viscous water flow","authors":"Ehsan Taati","doi":"10.1016/j.joes.2025.09.001","DOIUrl":"10.1016/j.joes.2025.09.001","url":null,"abstract":"<div><div>Within the framework of an equivalent single-layer beam theory incorporating moderately large deformations at contact surface, a nonlinear hydroelastic fluid-structure interaction (FSI) model is developed to investigate the buckling and postbuckling behavior of foam sandwich beams in viscous flow. The sandwich beam is assumed to consist of two orthotropic face sheets and a metal foam core, with a symmetric porosity distribution along the thickness direction. For the first time, the nonlinear pressure distribution of incompressible viscous flow along the beam length is derived based on the exponential variation of velocity components through the thickness, the nonlinear impermeability condition, the continuity equation, and the Navier–Stokes equation. Then, Timoshenko beam equations with von Kármán’s geometric nonlinearity are solved via the Galerkin method, to present the closed-form expressions of static equilibrium paths (in both prebuckling and postbuckling regimes), buckling compressive load <span><math><mrow><mo>(</mo><msub><mi>N</mi><mrow><mi>a</mi><mo>,</mo><mspace></mspace><mi>c</mi><mi>r</mi></mrow></msub><mo>)</mo></mrow></math></span>, and critical upstream speed <span><math><mrow><mo>(</mo><msub><mi>U</mi><mrow><mi>∞</mi><mo>,</mo><mspace></mspace><mi>c</mi><mi>r</mi></mrow></msub><mo>)</mo></mrow></math></span>. The numerical results indicate that the critical values are highly sensitive to the decay rate, therefore its accurate determination is crucial for understanding the effect of viscous flow on the mechanical behavior of foam sandwich beams. Furthermore, the findings reveal that the linear hydroelastic FSI model by neglecting the geometric nonlinearities is inadequate for predicting the buckling behavior.</div></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"10 6","pages":"Pages 1219-1230"},"PeriodicalIF":11.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145469188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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