A machine learning method for the prediction of ship motion trajectories in real operational conditions

Ocean Engineering, Journal Year: 2023, Volume and Issue: 283, P. 114905 - 114905

Published: June 16, 2023

This paper presents a big data analytics method for the proactive mitigation of grounding risk. The model encompasses dynamics ship motion trajectories while accounting kinematic uncertainties in real operational conditions. approach combines K-means and DB-SCAN (Density-Based Spatial Clustering Applications with Noise) clustering methods Principal Component Analysis (PCA) to group environmental factors. A Multiple-Output Gaussian Process Regression (MOGPR) is consequently used predict selected dynamics. Ship sway defined as deviation between her trajectory centreline. Surge accelerations are idealise time-varying manoeuvring ships various routes. Operational conditions simulated by Automatic Identification System (AIS), General Bathymetric Chart Oceans (GEBCO), nowcast hydro-meteorological records. Dynamic Time Warping (DTW) adopted identify centre-line along paths. machine learning algorithm applied predictions Ro-Pax operating two ports Gulf Finland. visualised ship's route using Progress (GPR) flow method. Results indicate that present methodology may assist predicting probabilistic distribution (speed, distance, drift angle, surge accelerations) risk

Language: Английский

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Research on risk, safety, and reliability of autonomous ships: A bibliometric review

Safety Science, Journal Year: 2023, Volume and Issue: 167, P. 106256 - 106256

Published: July 25, 2023

The safety and reliability of autonomous ships are critical for the successful realization an maritime ecosystem. Research collaboration between governments, industry, academia vital in achieving this goal. This paper conducts a bibliometric review research on risk, safety, aiming to provide researchers stakeholders with structured overview topics, development trends, networks field. 417 papers published 2011 2022 were identified covering 940 authors, 31 countries, 227 journals. Three main themes determined domain: "safety engineering risk assessment decision making", "navigation collision avoidance", "cybersecurity analysis". Meanwhile, it was that cybersecurity shipping is moving overlap which requires future co-analysis methods. Additionally, analysis most cited 30 suggests further needed topics unmanned machinery operation risks, online tools, system-theoretic analysis, human factor, determination suitable acceptance criteria ships. Furthermore, revealed unambiguous COLREGs regulation crucial safe avoidance algorithms MASS. It publication by Fan et al., (2020) key field, while journals Ocean Engineering, Reliability Engineering & System Safety, Safety Science publishing ship reliability.

Language: Английский

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A large-scale review of wave and tidal energy research over the last 20 years

Ocean Engineering, Journal Year: 2023, Volume and Issue: 282, P. 114995 - 114995

Published: June 12, 2023

Over the last two decades, a large body of academic scholarship has been generated on wave and tidal energy related topics. It is therefore important to assess analyse research direction development through horizon scanning processes. To synthesise such large-scale literature, this review adopts bibliometric method scrutinises over 8000 wave/tidal documents published during 2003–2021. Overall, 98 countries contributed with top ten mainly developed plus China produced nearly two-thirds research. A thorough analysis marked emergence four broad themes (dominated by subjects): (A) resource assessment, site selection, environmental impacts/benefits; (B) converters, hybrid systems, hydrodynamic performance; (C) vibration harvesting piezoelectric nanogenerators; (D) flow dynamics, turbines, turbine design. Further, nineteen sub-clusters, corresponding broader themes, were identified, highlighting trending An interesting observation was recent shift in focus from solely evaluating resources ideal sites integrating schemes into wider coastal/estuarine management plans developing multicriteria decision-making frameworks promoting novel designs cost-sharing practices. The results presented may provide insights evolution science its multiple topics, thus helping inform future decisions.

Language: Английский

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What makes an informative and publication-worthy scientometric analysis of literature: A guide for authors, reviewers and editors

Transportation Research Interdisciplinary Perspectives, Journal Year: 2023, Volume and Issue: 22, P. 100956 - 100956

Published: Nov. 1, 2023

In light of the proliferation scientometric/bibliometric software and its accessibility to a wide array researchers, we have witnessed substantial increase in literature analyses founded these methods across diverse scientific domains. With gaining popularity, influx similar papers seeking publication is expected continue forthcoming years. However, persistent questions remain regarding benchmarks for well-justified, informative, publication-worthy scientometric review paper. This concern resonates not only with authors but also holds significance editors reviewers tasked evaluating quality, rigour, relevance such contributions. this context, paper furnishes concise guide elucidating fundamental criteria underpinning analysis. Encompassing entire spectrum steps integral review, addresses rationale benefits undertaking an includes all relevant aspects as scoping, data procurement search methodologies, visualisation, result delineation interpretation. Furthermore, range prevalent misconceptions common errors respect genre scholarly publications. It concludes by proposing quality checklist that can be used standard benchmark assessing studies employ methodologies

Language: Английский

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Bilinear form, auto-Bäcklund transformations, Pfaffian, soliton, and breather solutions for a (3 + 1)-dimensional extended shallow water wave equation

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(8)

Published: Aug. 1, 2023

Study of the water waves remains central to fluid physics, ocean dynamics, and engineering. In this paper, a (3 + 1)-dimensional extended shallow wave equation is investigated via symbolic computation. Bilinear form two kinds bilinear auto-Bäcklund transformations with some solutions are given Hirota method. The Nth-order Pfaffian worked out by means technique, where N positive integer. N-soliton exported through solutions. By virtue asymptotic analysis, elastic inelastic interactions between solitons on periodic backgrounds discussed. Interaction among three illustrated graphically. higher-order breather complex parameter relation. Elastic breathers depicted Hybrid consisting obtained. one soliton background presented.

Language: Английский

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Numerical validations and investigation of a semi-submersible floating offshore wind turbine platform interacting with ocean waves using an SPH framework

Applied Ocean Research, Journal Year: 2023, Volume and Issue: 141, P. 103757 - 103757

Published: Oct. 19, 2023

In this work, we propose numerical validations of the DeepCwind semi-submersible floating platform configuration for a single horizontal axis wind turbine using data from two experimental testing investigations. A Smoothed Particle Hydrodynamics solver is employed to estimate fluid induced loads, whereas mooring connections are handled via an external library. The first validation setup based on offshore concept moored with system taut-lines and tested free-decay surge heave motion (OC6-Phase Ia). damping evaluation yields fair estimation behavior, much more dissipation experienced surge. second features full hydrodynamic characterization frequency-related load patterns by three different sea-state representations (mono-, bi-chromatic, irregular waves) Ib). model accurately matches whole spectrum investigated wave components, perfectly capturing non-linear behavior shown considered patterns. This work concludes systematic study response, tension, pressure vorticity, suggesting that: steepness criterion alone cannot identify most restrictive case; waves spectral characteristics close resonance period lead higher tensions in systems, maximum fluid-induced loads hull decoupled displacement peaks, showing average reduction 30% respect maxima; very steep maximize likelihood overtopping slamming resulting locally overpressure free-board up 100% than expected similar heights milder profiles. input these last tests released sake reproduction.

Language: Английский

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A comprehensive bibliometric analysis and assessment of high-impact research on the berth allocation problem

Ocean Engineering, Journal Year: 2024, Volume and Issue: 300, P. 117163 - 117163

Published: March 13, 2024

Language: Английский

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A review on the hydrodynamics of planing hulls

Ocean Engineering, Journal Year: 2024, Volume and Issue: 303, P. 117046 - 117046

Published: April 8, 2024

The topology of planing hulls entails some the most innovative specifications found in modern advanced marine vehicles. Planing hull designs can vary depending on their intended use and hence sound understanding influence hydrodynamics craft stability performance is key within context design for safety sustainability requirements. motions stepless or stepped surfaces, be it steady unsteady are strongly coupled with nonlinear fluid flows. Consequently, calm water performance, seakeeping maneuvering waves, idealised by a diverse array analytical simulation-based models. In this paper, we holistically review scholarly studies subject, discuss research challenges opportunities ahead. A conclusion drawn that, although mathematical models, especially ones that simulate motions, require further development to account complexities operating real-world environment, they mostly limited monohull without steps. It also suggested emergence new-generation artificial intelligence algorithms opens up new prospects hydrodynamic modelling as accounting dynamic motion predictions. holistic optimization hulls, realm yet overlooked hydrodynamics, identified an important interesting future opportunity. Pairing AI methods recommended direction intelligent boat systems.

Language: Английский

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Climate change science is evolving toward adaptation and mitigation solutions

Wiley Interdisciplinary Reviews Climate Change, Journal Year: 2024, Volume and Issue: 15(4)

Published: March 24, 2024

Abstract Synthesizing the extensive and ever‐growing climate change literature is becoming increasingly challenging using conventional review processes, yet crucial to understand key trends, including knowledge policy related gaps, managing widespread impacts, prioritizing future efforts. Here, we employ a systematic approach interrogate ~130,000 international peer‐reviewed articles published between 1990 2021. We examine time–space evolution of research topics collaborations, providing insights into broad scale themes, how they are developed and/or interconnected. Our analyses indicate that significant thematic adjustments have occurred over past three decades. Whilst all major areas grown in output metrics, there has been relative shift from understanding physical science basis toward evaluating adaptation, mitigation. There also internationalization with ratio domestic increasing 0.05 nearly 0.60 These findings reveal growing need for collective coupled adaptation‐mitigation actions address change. The repeatable method overall results presented herein can help complement existing large‐scale assessments, such as IPCC reports. This article categorized under: Climate, History, Society, Culture > Disciplinary Perspectives Integrated Assessment Climate Change Methods

Language: Английский

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A lever-type piezoelectric wave energy harvester based on magnetic coupling and inertial vibration

Sustainable Energy Technologies and Assessments, Journal Year: 2024, Volume and Issue: 62, P. 103605 - 103605

Published: Jan. 9, 2024

Language: Английский

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