Applied Ocean Research最新文献_第3页

Deep reinforcement learning for collision avoidance in unmanned surface vehicles: State-of-the-art 无人水面车辆避碰的深度强化学习：最新进展

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-18 DOI: 10.1016/j.apor.2025.104778

Yuqin Li , Defeng Wu , Zheng You , Guoquan Chen , Dongjie Wu

{"title":"Deep reinforcement learning for collision avoidance in unmanned surface vehicles: State-of-the-art","authors":"Yuqin Li , Defeng Wu , Zheng You , Guoquan Chen , Dongjie Wu","doi":"10.1016/j.apor.2025.104778","DOIUrl":"10.1016/j.apor.2025.104778","url":null,"abstract":"<div><div>In recent years, deep reinforcement learning (DRL) has attracted growing attention in the field of collision avoidance for unmanned surface vehicles (USVs). The collision avoidance problem can be naturally formulated as a Markov decision process (MDP), where sequential decision-making is required under dynamic and uncertain maritime conditions. By integrating the perception capabilities of deep learning with the decision-making strengths of reinforcement learning, DRL demonstrates strong adaptability and robustness in solving such MDP-based problems. This review systematically summarizes the frameworks and principles of DRL algorithms for USVs collision avoidance, with emphasis on value-based methods, policy-based methods, and multi-agent DRL methods. Key research topics are systematically reviewed, including reward function design, state-space representation, exploration strategies, integration of safety regulations, robustness to disturbances, environment modeling, and application domains. Challenges in current studies are analyzed, and potential future research directions are proposed to advance DRL methodologies and promote their practical deployment in USVs navigation. This work aims to provide researchers with a consolidated understanding of DRL-based collision avoidance, fostering innovation and accelerating the engineering implementation of autonomous maritime systems.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"164 ","pages":"Article 104778"},"PeriodicalIF":4.4,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097315","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

Reliability modelling and assessment of subsea oil and gas pipelines considering competing failures caused by dropped object impact and corrosion degradation 考虑掉落物冲击和腐蚀退化导致的竞争失效的海底油气管道可靠性建模与评估

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-18 DOI: 10.1016/j.apor.2025.104783

Wei Zeng , Yuxuan Han , Xumin Tian , Jun Zhao

{"title":"Reliability modelling and assessment of subsea oil and gas pipelines considering competing failures caused by dropped object impact and corrosion degradation","authors":"Wei Zeng , Yuxuan Han , Xumin Tian , Jun Zhao","doi":"10.1016/j.apor.2025.104783","DOIUrl":"10.1016/j.apor.2025.104783","url":null,"abstract":"<div><div>Reliability assessment of subsea pipelines is critical for preventing leaks and ensuring operational safety. This study addresses pipelines subjected to concurrent dropped-object impacts and corrosion degradation. By establishing both a competitive-failure reliability model that accounts for failure mode interactions and its corresponding parameter determination methodology, an integrated reliability assessment framework is proposed specifically for subsea pipeline systems under competing failure scenarios. Case studies on DN400 pipelines reveal that traditional single-mode assessments exhibit excessive conservatism, compromising result accuracy. The model demonstrates that ultimate failure stems from temporal competition between failure modes: corrosion dominates late-stage degradation while impacts govern acute structural responses during mid-to-late service phases. Comparative analyses show the competitive- failure model achieves more rational residual life predictions than conventional methods. The framework provides a theoretical basis for optimizing inspection intervals and maintenance strategies, particularly for pipelines in high-risk zones with complex environmental loads. Finally, the proposed methodology was extended to reliability assessment of subsea pipelines with different steel grades and specifications, yielding corresponding reliability analysis results. These findings advance reliability methodologies by reconciling multi-failure physics, offering practical references for design optimization and safety management of subsea energy infrastructure. The model's adaptability shows potential for extension to other marine structures exposed to combined mechanical and environmental stressors.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"164 ","pages":"Article 104783"},"PeriodicalIF":4.4,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097304","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

Three-dimensional submarine-volcano-generated tsunamis: Numerical and physical model comparisons 三维海底火山产生的海啸：数值和物理模型比较

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-17 DOI: 10.1016/j.apor.2025.104769

Richards C. Sunny , Juan Horrillo , Wei Cheng , Yibin Liu , Hermann M. Fritz

{"title":"Three-dimensional submarine-volcano-generated tsunamis: Numerical and physical model comparisons","authors":"Richards C. Sunny , Juan Horrillo , Wei Cheng , Yibin Liu , Hermann M. Fritz","doi":"10.1016/j.apor.2025.104769","DOIUrl":"10.1016/j.apor.2025.104769","url":null,"abstract":"<div><div>A recent submarine volcanic eruption in Tonga renewed interest in the dynamics and impacts of tsunamis generated by volcanic activity. Laboratory experiments were performed to investigate tsunami generation by sudden vertical deformation using a novel pneumatic Volcanic Tsunami Generator (VTG), which rapidly displaces a 1.2 m-diameter water column by up to 0.3 m in under one second. Eight representative VTG runs, spanning water depths of 0.9–1.2 m and piston pressures of 40–145 psi, were instrumented with four wave gauges. Three-dimensional simulations solving the full Navier–Stokes equations (TSUNAMI3D) were performed and validated against the experimental data in the time, frequency, and time–frequency (wavelet) domains. Across all gauge locations and cases, correlation coefficients exceeded 84% (up to 96% in the far field) and RMSE remained within 20% of the peak wave heights, demonstrating that TSUNAMI3D reliably captures low-frequency dispersion and transient nonlinearity. Because the VTG imposes rapid vertical volume expansion with a time-varying wetted area, this source-specific validation addresses eruption-analog forcing rather than idealized bottom uplifts. While TSUNAMI3D captures the overall wave dynamics well, near-field nonlinear and multiphase effects remain underresolved; future work should refine grid resolution and free-surface treatment to better capture high-frequency, source-proximal behavior. A validated submarine volcanic tsunami numerical model can support agencies such as the National Tsunami Hazard Mitigation Program in refining inundation and evacuation mapping, thereby enhancing community preparedness and safeguarding lives and property.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"164 ","pages":"Article 104769"},"PeriodicalIF":4.4,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097415","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

Envelope of bearing capacity for gravity anchors in strain-softening soils under VHM loading: A Cosserat continuum FEM study VHM荷载下应变软化土重力锚杆承载力包络：连续连续有限元研究

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-15 DOI: 10.1016/j.apor.2025.104766

Xiangji Ye , Wencheng Wei , Xiaolong Ye , Hongxiang Tang , Zezhou Ji , Xin zhao

{"title":"Envelope of bearing capacity for gravity anchors in strain-softening soils under VHM loading: A Cosserat continuum FEM study","authors":"Xiangji Ye , Wencheng Wei , Xiaolong Ye , Hongxiang Tang , Zezhou Ji , Xin zhao","doi":"10.1016/j.apor.2025.104766","DOIUrl":"10.1016/j.apor.2025.104766","url":null,"abstract":"<div><div>In offshore foundation bearing capacity analysis, the failure envelope method is widely used because it clearly separates load components. However, previous studies on the bearing capacity of gravity anchors under combined loads have not effectively accounted for soil strain-softening behavior. To address this limitation, a Mohr-Coulomb-matched Drucker-Prager model is adopted within the Cosserat continuum framework (MC-matched DP model). Numerical simulations were conducted using Abaqus’s user-defined element (UEL) functionality. Validation against existing literature confirms the accuracy and applicability of the Cosserat continuum model for analyzing the bearing capacity of gravity anchors under VHM combined loading conditions. This approach successfully resolves numerical convergence difficulties and pathological mesh dependency issues commonly observed in finite element analyses of strain-softening soils. The model was then applied to conduct a comprehensive analysis of the bearing capacity envelopes of gravity anchors. Through parametric studies, the influences of anchor embedment depth, vertical load magnitude, and strain-softening degree on the bearing capacity envelope were systematically investigated. Normalized bearing capacity envelope formulas were derived for various scenarios, providing a robust framework for evaluating the performance of gravity anchors under different conditions.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"164 ","pages":"Article 104766"},"PeriodicalIF":4.4,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145061169","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

Structural optimization of offshore jacket platforms considering structure-pile-soil interactions, using a continuous genetic algorithm 考虑结构-桩-土相互作用的海上导管架平台结构优化

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-14 DOI: 10.1016/j.apor.2025.104767

Naser Shabakhty, Hamid Reza Karimi, Abbas Yeganeh-Bakhtiary, Mahdi Ghanbarian

{"title":"Structural optimization of offshore jacket platforms considering structure-pile-soil interactions, using a continuous genetic algorithm","authors":"Naser Shabakhty, Hamid Reza Karimi, Abbas Yeganeh-Bakhtiary, Mahdi Ghanbarian","doi":"10.1016/j.apor.2025.104767","DOIUrl":"10.1016/j.apor.2025.104767","url":null,"abstract":"<div><div>Offshore platforms must withstand large structural, operational, and environmental loads for decades while maintaining adequate structural safety and minimizing construction costs. In this regard, structural optimization can serve as an efficient approach. In this research, a meta-innovation method, based on a genetic algorithm, is used to optimize the cross-sectional characteristics (diameter and thickness of members) of an offshore jacket-type platform. With this aim, several decision variables, including the diameter and thickness of members, were considered by defining constraints such as design criteria (stress and buckling for members and drifts of the whole platform), by adding the weight of the platform as a parameter to reflect the construction cost. As minimizing the weight of the platform may affect its stability on the seabed, the nonlinear effect of structure-pile-soil interaction on the optimization process is also considered. To model this interaction, nonlinear P-y, T-z, and Q-z springs have been considered, based on API standards and the geotechnical characteristics of the soil. The results show that considering the structure-pile-soil interaction results in more accurate results. In other words, the dynamic properties of the platform, influenced by the soil-pile interaction, will alter the optimization of the jacket platform to reduce its structural cost.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"164 ","pages":"Article 104767"},"PeriodicalIF":4.4,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057295","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 modelling of gravel transportation by a tsunami with the extended XBeach-G 扩展XBeach-G的海啸碎石输运数值模拟

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-13 DOI: 10.1016/j.apor.2025.104765

Masashi Watanabe , Gerd Masselink , Daisuke Ishimura , Masaki Yamada , Adam D. Switzer

{"title":"Numerical modelling of gravel transportation by a tsunami with the extended XBeach-G","authors":"Masashi Watanabe , Gerd Masselink , Daisuke Ishimura , Masaki Yamada , Adam D. Switzer","doi":"10.1016/j.apor.2025.104765","DOIUrl":"10.1016/j.apor.2025.104765","url":null,"abstract":"<div><div>Estimating coastal erosion by a tsunami is essential for land use planning, assessing hazards for current structures (e.g., coastal nuclear power plants), and for paleotsunami reconstruction. Such estimations are currently available only for sandy beaches, using sand sediment transport models, which are not applicable to gravel beaches, which are the most common beach type in high-latitude settings. This study extended the one-dimensional cross-shore XBeach-G model to account for two-dimensional gravel transport by a tsunami. First, this study confirmed that the extended XBeach-G model can simulate a time series of waveforms of solitary waves during laboratory experiments. The proposed model was then applied to gravel transport by the 2011 Tohoku-oki tsunami at Koyadori, Japan, and found that the simulation results were consistent with observations of gravel deposits in previous studies. It was revealed that infiltration and exfiltration have an impact on morphological change caused by a tsunami on gravel coasts. In the simulation, inundation depth over land by the tsunami increased due to groundwater exfiltration, which increased the onshore deposition volume of gravel tsunami deposits. The groundwater flow calculation has not been incorporated so far for tsunami modelling, but this is important for modelling tsunami inundation at gravel beaches and gravel sediment transport by a tsunami. However, choosing appropriate values for the sediment friction factor and multiplier in the equation for gravel transport is more critical to reproducing the deposition of gravel sediments by a tsunami because these parameters are more sensitive than the parameter of groundwater flow. Although the presented model has been developed for tsunami simulation on any gravel beach, further testing and validation are recommended.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"164 ","pages":"Article 104765"},"PeriodicalIF":4.4,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047406","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

Effect of sloshing on a local structural system in a partially filled tank 局部充液槽内晃动对局部结构系统的影响

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-12 DOI: 10.1016/j.apor.2025.104763

S.K. Kleivane, B.J. Leira

引用次数: 0

Establishing AEM structural framework within SPH-MBD coupling for hydro-viscoelastic response of very flexible floating structures 建立了SPH-MBD耦合下的AEM结构框架，研究了非常柔性浮体结构的水粘弹响应

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-11 DOI: 10.1016/j.apor.2025.104760

Rafail Ioannou , Vasiliki Stratigaki , Eva Loukogeorgaki , Peter Troch

{"title":"Establishing AEM structural framework within SPH-MBD coupling for hydro-viscoelastic response of very flexible floating structures","authors":"Rafail Ioannou , Vasiliki Stratigaki , Eva Loukogeorgaki , Peter Troch","doi":"10.1016/j.apor.2025.104760","DOIUrl":"10.1016/j.apor.2025.104760","url":null,"abstract":"<div><div>Very Flexible Floating Structures (VFFS), deployed into offshore environments by the renewable energy sector, have set the ground for new marine applications. Characterized by very thin and elongated structural layouts, while composed of highly flexible materials, they exhibit non-linear structural behaviour when subjected to wave-induced loads. To numerically predict their hydro-viscoelastic response, the Applied Element Method (AEM), commonly used in non-linear structural dynamics, is introduced into the existing coupling scheme of the Smoothed Particle Hydrodynamics (SPH) solver, DualSPHysics, and the Multibody Dynamics (MBD) module of Project Chrono. In this paper, the coupling scheme is modified to implicitly define the timestep of Project Chrono, facilitating the development of AEM formulated structures. The structural response accuracy of the proposed framework is validated against analytical and experimental data in both dry and wet conditions, covering linear and non-linear deformations, as well as elastic and viscous material properties. Fluid response is also verified through wave reflection and wave dissipation, demonstrating the suitability of the developed numerical framework for modelling non-linear fluid-flexible structure interaction applications.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"164 ","pages":"Article 104760"},"PeriodicalIF":4.4,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047404","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

A novel cylinder lifting system design and simulation with integrated drill pillar compensation function 一种集成钻柱补偿功能的新型油缸提升系统设计与仿真

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-10 DOI: 10.1016/j.apor.2025.104629

Jingxi Lei , Qiang Wang , Huan Li , Rui Su , Lijun Wang , Chao Liu

{"title":"A novel cylinder lifting system design and simulation with integrated drill pillar compensation function","authors":"Jingxi Lei , Qiang Wang , Huan Li , Rui Su , Lijun Wang , Chao Liu","doi":"10.1016/j.apor.2025.104629","DOIUrl":"10.1016/j.apor.2025.104629","url":null,"abstract":"<div><div>Offshore drilling rigs equipped with cylinder lifting systems have been increasingly adopted in newly constructed drilling vessels, offering significant advantages over traditional winch-based lifting systems. These advantages include improved control over the ship's center of gravity, reduced installed power requirements, enhanced maintainability, and greater energy efficiency. In this study, the feasibility and performance of the drilling string compensation function provided by the new cylinder lifting system are investigated. The mechanism underlying the drilling string compensation function is analyzed, and the longitudinal vibration characteristics of the drilling string are examined during offshore deep-hole drilling operations. To further assess the system's capabilities, a detailed simulation model of the drilling string compensation function is developed using the AMESim software platform. This model allows for the evaluation of the system's performance under varying operating conditions and different drilling depths. The results demonstrate that the cylinder lifting system is capable of achieving both passive and semi-active compensation of the drilling string. Notably, the system can effectively control compensation load and mitigate fluctuations in bottomhole pressure, thereby meeting operational requirements. While operating conditions have a greater impact on passive compensation, the introduction of semi-active compensation significantly reduces the influence of these conditions, ensuring more stable and efficient drilling operations.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"164 ","pages":"Article 104629"},"PeriodicalIF":4.4,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027246","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

Hydrodynamic performance of floating solar arrays with articulated modules for optimal wave adaptation 具有铰接模块的浮动太阳能电池阵列的水动力性能，以达到最佳的波浪适应

IF 4.4 2区工程技术

Applied Ocean Research Pub Date : 2025-09-10 DOI: 10.1016/j.apor.2025.104762

Guiyong Zhang , Fangyi Bao , Changqing Jiang , Ould el Moctar , Zenghui Xu , Bo Zhou

{"title":"Hydrodynamic performance of floating solar arrays with articulated modules for optimal wave adaptation","authors":"Guiyong Zhang , Fangyi Bao , Changqing Jiang , Ould el Moctar , Zenghui Xu , Bo Zhou","doi":"10.1016/j.apor.2025.104762","DOIUrl":"10.1016/j.apor.2025.104762","url":null,"abstract":"<div><div>The hydrodynamic performance of articulated floating photovoltaic (FPV) arrays remains insufficiently understood, despite their potential for large-scale offshore deployment. This study investigates a novel modular FPV system composed of interconnected buoyant units with articulated joints, designed to optimize wave adaptation. A hybrid approach is employed, integrating viscous-flow effects from computational fluid dynamics (CFD) into a potential-flow solver to enhance motion response predictions. The calibrated solver is validated against CFD simulations, demonstrating strong agreement in surge, heave, and pitch responses for both single and multi-module configurations. Parametric studies reveal that hydrodynamic behaviors are highly sensitive to the number and arrangement of modules, particularly near natural frequencies. Articulated connections effectively reduce inter-module loads and enhance stability, with larger arrays exhibiting progressive motion damping along the chain. Parallel configurations further suppress resonant responses compared to linear chains, highlighting the role of geometric arrangement in load distribution. Our key findings indicate that mid-body hinges experience higher forces, while trailing modules exhibit reduced motion amplitudes due to wave energy dissipation. These insights inform the wave-adaptive design and offshore deployment of articulated FPV systems.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"164 ","pages":"Article 104762"},"PeriodicalIF":4.4,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027247","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