Applied Ocean Research最新文献_第6页

Analysis of sediment disturbance and plume dispersion characteristics induced by deep-sea polymetallic nodule hydraulic collectors

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-20 DOI: 10.1016/j.apor.2025.104462

Zhengqi Wu , Xiuzhan Zhang , Shuai Jin , Jiancheng Liu , Xixi Liu , Lei Li , Fengluo Chen , Xuguang Chen , Jiakang Wei , Hao Li

{"title":"Analysis of sediment disturbance and plume dispersion characteristics induced by deep-sea polymetallic nodule hydraulic collectors","authors":"Zhengqi Wu , Xiuzhan Zhang , Shuai Jin , Jiancheng Liu , Xixi Liu , Lei Li , Fengluo Chen , Xuguang Chen , Jiakang Wei , Hao Li","doi":"10.1016/j.apor.2025.104462","DOIUrl":"10.1016/j.apor.2025.104462","url":null,"abstract":"<div><div>Environmental disturbances caused by seabed mining have garnered significant international attention. Deep-sea hydraulic mining inevitably disrupts seafloor sediments, transforming them into fine particles that remain suspended, posing long-term threats to marine ecosystems. This study systematically investigates sediment disturbance characteristics under varying jet parameters through model experiments, aiming to assess the environmental impact of jetting operations and optimize jet parameters. The jet parameters investigated include jet velocity, target distance, and nozzle height. Results indicate that seabed disturbance process can be divided into three stages: critical suspension, critical erosion, and plume dispersion. Seabed morphology exhibits distinct V-shaped or U-shaped features, with target-to-nozzle height ratios (<em>B</em>/<em>H</em>) equals to 1 identified as the critical threshold for shape transition. Plume transformation rate increases with jet velocity, ranging from 15% to 55%. After disturbance, the plume suspended concentration decreases with increasing nozzle height, reaching a maximum reduction of up to 70%. These findings provide valuable data for minimizing environmental disturbance in deep-sea jetting operations. Based on experimental results, a new method for calculating the relationship between jet parameters and plume dispersion is proposed, offering a theoretical and technical basis for reducing environmental impact in deep-sea mining.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"156 ","pages":"Article 104462"},"PeriodicalIF":4.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445959","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

Linear active disturbance rejection control with linear quadratic regulator for Stewart platform in active wave compensation system

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-20 DOI: 10.1016/j.apor.2025.104469

Wenxuan Wang , Yinghao Ning , Yang Zhang , Peng Xu , Bing Li

{"title":"Linear active disturbance rejection control with linear quadratic regulator for Stewart platform in active wave compensation system","authors":"Wenxuan Wang , Yinghao Ning , Yang Zhang , Peng Xu , Bing Li","doi":"10.1016/j.apor.2025.104469","DOIUrl":"10.1016/j.apor.2025.104469","url":null,"abstract":"<div><div>Offshore operations are vulnerable to the vessel motions caused by waves in harsh sea conditions. To compensate for the wave-included motions of the vessel, the shipborne Stewart platform with a gangway mechanism offers an effective means to enhance operator safety and extend the window period for offshore activities. The gangway endures off-center heavy loads and low-frequency vibrations, while the shipborne Stewart platform faces time-varying ship motions caused by waves. In addition, there is a strong motion coupling between the limbs of the Stewart platform. These challenges pose a formidable task in attaining precise control accuracy for wave compensation. In this study, a linear active disturbance rejection control with a linear quadratic regulator is proposed for the shipborne Stewart platform. The original proportional-derivative gain is substituted with a linear quadratic regulator (LQR), thereby effectively addressing the previous challenge of channel parameter tuning. Additionally, a linear extended state observer is devised to enhance system robustness by estimating and counteracting overall disturbance. The proposed controller is designed based on joint-space and its stability is verified using the Lyapunov theory. Simulation results validate that the proposed controller demonstrates superior performance in terms of compensation accuracy, anti-disturbance capability, and decoupling effect compared to the PI and LQR controllers.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"156 ","pages":"Article 104469"},"PeriodicalIF":4.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445960","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

Energy-harvesting performance of a fully-passive coupled-pitching hydrofoil: A numerical study

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-19 DOI: 10.1016/j.apor.2025.104468

Zhen Liu , Xinyu Song , Yangshun Zhu

引用次数: 0

Data-driven dynamic modeling for precise trajectory tracking of a bio-inspired robotic fish

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-17 DOI: 10.1016/j.apor.2025.104463

Zhiping Wang , Zonggang Li , Guangqing Xia , Huifeng Kang , Bin Li , Qingquan Li , Lixin Zheng

{"title":"Data-driven dynamic modeling for precise trajectory tracking of a bio-inspired robotic fish","authors":"Zhiping Wang , Zonggang Li , Guangqing Xia , Huifeng Kang , Bin Li , Qingquan Li , Lixin Zheng","doi":"10.1016/j.apor.2025.104463","DOIUrl":"10.1016/j.apor.2025.104463","url":null,"abstract":"<div><div>We propose utilizing an attention mechanism and deep neural networks to develop a hydrodynamic identification model, integrated with a time-triggered nonlinear model predictive controller (ENMPC) for precise trajectory tracking of a robotic fish. A central pattern generator (CPG) network was employed to design a synergistic gait controller for the robotic fish that could coordinate its pectoral fins and flexible body/caudal fins to enable multimodal motion. We derived a nonlinear map between the driving parameters and the thrust/torque of the robotic fish using a computational fluid dynamics (CFD) simulation dataset. The attention mechanism was applied to incorporate laminar flow effects and construct a hydrodynamic identification model based on a bidirectional long short-term memory (Bi-LSTM) network. This identification model serves as the foundation for learning a control transformation model that operates as its inverse. Finally, event-triggered nonlinear model predictive constraints were adjusted to account for external disturbances and thereby ensure the convergence of robotic fish tracking errors while minimizing computational costs.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"156 ","pages":"Article 104463"},"PeriodicalIF":4.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419353","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

Integrated path planning for AUV communication efficiency and obstacle avoidance based on ant colony optimization and three-dimensional dynamic window algorithm

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-16 DOI: 10.1016/j.apor.2025.104465

Xiaoyu Yuan , Jiawei Wang , Chengchang Tong , Hongbo Wang

{"title":"Integrated path planning for AUV communication efficiency and obstacle avoidance based on ant colony optimization and three-dimensional dynamic window algorithm","authors":"Xiaoyu Yuan , Jiawei Wang , Chengchang Tong , Hongbo Wang","doi":"10.1016/j.apor.2025.104465","DOIUrl":"10.1016/j.apor.2025.104465","url":null,"abstract":"<div><div>In tasks such as deep-sea exploration, underwater resource surveying, and archaeological excavation, autonomous underwater vehicles (AUVs) significantly improve the success rate of missions while lowering costs and safety risks. However, AUVs encounter challenges such as poor communication environments, low acoustic communication rates, and dynamic obstacle avoidance during underwater operations. To tackle these issues, this study proposes a multiobjective path planning approach that involves combining improved ant colony optimization (ACO) with a three-dimensional (3D) dynamic window approach (DWA) to optimize the global path planning of AUVs while avoiding obstacles and minimizing path length and communication propagation loss. By introducing nondominated sorting, enhanced heuristic functions, and pheromone update rules, the improved 3D ACO algorithm successfully solves multiobjective optimization problems and balances path length and propagation loss. Moreover, by incorporating the improved 3D-DWA method, the AUV can dynamically avoid obstacles in real time based on the global route supplied by the 3D ACO, guaranteeing safe navigation in dynamic marine environments. By allocating diverse weights to the pitch velocity regions in the DWA method, AUVs can respond to dynamic obstacles in the environment more flexibly, further increasing mission efficiency and safety. Experimental results show that compared with the traditional methods, this method demonstrates significant benefits in terms of path length and communication efficiency, stressing its potential application in complex marine environments.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"156 ","pages":"Article 104465"},"PeriodicalIF":4.3,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419351","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

Combination of backscatter calculation and image segmentation for denoising gated light ranging and imaging in fishing net detection

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-16 DOI: 10.1016/j.apor.2025.104455

Zhensong Xu , Xinwei Wang , Liang Sun , Bo Song , Yue Zhang , Pingshun Lei , Jianan Chen , Jun He , Yan Zhou , Yuliang Liu

{"title":"Combination of backscatter calculation and image segmentation for denoising gated light ranging and imaging in fishing net detection","authors":"Zhensong Xu , Xinwei Wang , Liang Sun , Bo Song , Yue Zhang , Pingshun Lei , Jianan Chen , Jun He , Yan Zhou , Yuliang Liu","doi":"10.1016/j.apor.2025.104455","DOIUrl":"10.1016/j.apor.2025.104455","url":null,"abstract":"<div><div>Underwater fishing net detection and location plays a crucial role in applications such as safe navigation of unmanned underwater vehicles, protection of marine ecology and marine ranching. However, due to difficulties in detecting fishing nets and noise interference in underwater environments, underwater fishing net detection and location at long distance remains unsolved. In this paper, we use gated light ranging and imaging (LiRAI) as the detection hardware, and propose an underwater fishing net location algorithm based on the physical prior of backscatter noise. The proposed method utilizes the prior knowledge about the distributions of backscatter noise in the target and background regions. An image segmentation network based on deep learning and the initial depth information provided by gated LiRAI are employed to estimate the backscatter noise based on the prior knowledge. Our method can effectively eliminate the backscatter noise and obtain accurate fishing net location results. Field experiments show our method achieves 0.001 absolute relative error (Abs Rel) and 0.156 root mean square error (RMSE) at 27 m in water with <span><math><mrow><mi>0</mi><mi>.26</mi><msup><mrow><mi>m</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></math></span> attenuation coefficient. Moreover, experiments in underwater environments with different turbidity further validate the effectiveness and generalization of our method.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"156 ","pages":"Article 104455"},"PeriodicalIF":4.3,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419352","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

Modeling inline oscillating foils using periodic conformal mapping

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-16 DOI: 10.1016/j.apor.2025.104459

Wei-Kuo Yen , Derek A. Paley

{"title":"Modeling inline oscillating foils using periodic conformal mapping","authors":"Wei-Kuo Yen , Derek A. Paley","doi":"10.1016/j.apor.2025.104459","DOIUrl":"10.1016/j.apor.2025.104459","url":null,"abstract":"<div><div>Inline oscillating foils can obtain hydrodynamic benefits by adequately maintaining their spacing and interacting with the oncoming wakes. Since the complexity increases with the group size, this work explores the hydrodynamic performance of in-phase oscillating foils with inline configuration using periodic conformal mapping. An array of infinite foils in the physical domain is mapped from a circle in the complex circular domain with a branch cut designed for the periodic boundary condition. The flow field is described by complex potential functions that satisfy the corresponding boundary conditions. The wake generated by each foil is represented as point vortices shed from the trailing edge of the foil. The thrust coefficient, power coefficient, and propulsive efficiency of the foils with various sway amplitudes, maximum angles of attack, Strouhal numbers, and along-stream separation distances are compared in simulations. Based on the results, the velocity agreement between the foil motion and the oncoming vortex-induced flow affects the thrust production and power consumption of the foils. The foils obtain efficiency enhancement when the separation distance between each foil is close to an integer multiple of wavelength. The results can help explore the flow interactions between inline oscillating foils and may be beneficial to forming schooling control strategies.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"156 ","pages":"Article 104459"},"PeriodicalIF":4.3,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419349","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

Effect of soil remoulding on loss of embedment and bearing capacity of square plate anchors in clay

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-16 DOI: 10.1016/j.apor.2025.104470

Li Cheng , Yuxia Hu , Yunrui Han , M.S. Hossain , Zhichao Shen

{"title":"Effect of soil remoulding on loss of embedment and bearing capacity of square plate anchors in clay","authors":"Li Cheng , Yuxia Hu , Yunrui Han , M.S. Hossain , Zhichao Shen","doi":"10.1016/j.apor.2025.104470","DOIUrl":"10.1016/j.apor.2025.104470","url":null,"abstract":"<div><div>This paper investigates the keying behaviour and capacity of square plate anchors in clay through three-dimensional large deformation finite element (LDFE) analysis. Strain rate dependency of the undrained shear strength and shear induced remoulding of clay (strain softening) are accounted for. The current LDFE results are first validated against existing centrifuge test data, theoretical and numerical results; with good agreement obtained. The soil remoulding effect on the anchor behaviour is then explored varying soil strength heterogeneity, soil sensitivity, anchor embedment ratio after installation, load eccentricity, and load inclination at the mudline. The clay surrounding the anchor undergoes significant remoulding during keying, resulting in a significant reduction of anchor embedment depth and capacity under subsequent loading. Design expressions and charts are proposed for assessing loss of embedment and ultimate bearing capacity. The keying behaviours of square plate anchors are compared with existing those of strip plate anchors. The square anchors show higher capacities and lower loss of embedment in both uniform and normally consolidated clays, which demonstrate that a simple shape factor cannot be applied from strip to square plate anchors.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"156 ","pages":"Article 104470"},"PeriodicalIF":4.3,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419350","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

Study of multiobjective speed optimization and multivariate analysis considering the carbon intensity indicator (CII) regulation

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-14 DOI: 10.1016/j.apor.2025.104466

Li Xuebin, Yang Luchun, Tang Zhengmao, Jin Zhao, Zhang Wenjin

{"title":"Study of multiobjective speed optimization and multivariate analysis considering the carbon intensity indicator (CII) regulation","authors":"Li Xuebin, Yang Luchun, Tang Zhengmao, Jin Zhao, Zhang Wenjin","doi":"10.1016/j.apor.2025.104466","DOIUrl":"10.1016/j.apor.2025.104466","url":null,"abstract":"<div><div>Low-carbon shipping plays a pivotal role in ship operations, and this study is dedicated to optimizing economic benefits and environmental friendliness concurrently while adhering to carbon intensity indicator (CII) regulation. The study proposes a comprehensive flowchart incorporating multiobjective optimization and multivariate analysis, aimed at maximizing economic benefits and minimizing fuel consumption, with the CII regulation serving as a key constraint. By leveraging the Multi-objective Bonobo optimizer (MOBO), the study identifies the Pareto set to determine the final compromise solution using the multi-attribute decision-making (MADM) approach, TOPSIS, coupled with entropy weighting. The study employs four multivariate analysis (MVA) methods - self-organizing mapping (SOM), hierarchical clustering analysis (HCA), principal component analysis (PCA), and Student <em>t</em>-test - to gain in-depth insights into the decision variable space and corresponding performance space. The efficacy and versatility of the proposed flowchart are demonstrated through the analysis of two oil carriers, showcasing the impact of CII regulations and operational parameters on economic benefits and fuel consumption. Upgrading rank B to A will lead to a 3.50 % and 1.64 % reduction in total distance traveled at full load, while degrading to rank C will result in a 5.74 % and 6.93 % improvement in the distance for these two ships. This study underscores the ability to achieve trade-offs within the same CII rank and unveils valuable relationships between speeds, proportions, and overall performance through MVA. Ultimately, the study offers solid support for ship operations in compliance with CII regulations.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"156 ","pages":"Article 104466"},"PeriodicalIF":4.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419347","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

Adaptive informative path planning for active reconstruction of spatio-temporal water pollution dispersion using Unmanned Surface Vehicles

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-02-14 DOI: 10.1016/j.apor.2025.104458

Song Ma , Cunjia Liu , Christopher M. Harvey , Richard Bucknall , Yuanchang Liu

{"title":"Adaptive informative path planning for active reconstruction of spatio-temporal water pollution dispersion using Unmanned Surface Vehicles","authors":"Song Ma , Cunjia Liu , Christopher M. Harvey , Richard Bucknall , Yuanchang Liu","doi":"10.1016/j.apor.2025.104458","DOIUrl":"10.1016/j.apor.2025.104458","url":null,"abstract":"<div><div>Real-time pollution monitoring is critical for marine environmental management, where accurate tracking and reconstruction of pollutant dispersion are essential to mitigate ecological impacts. This paper introduces an adaptive informative path planning (IPP) framework designed to address the challenges of reconstructing spatio-temporally varying dynamic environments, focusing on pollutant dispersion in marine environments. The framework combines a Finite Element Analysis (FEA)-based pollutant dispersion model with a recursive Bayesian estimator to capture spatio-temporal dynamics in complex marine environments accurately. Two information-based utility functions are developed to quantify and reduce system state uncertainty, enabling more effective and targeted data collection by Unmanned Surface Vehicles (USVs). Monte Carlo Tree Search (MCTS)-based path planning strategies are employed in the proposed framework with thorough comparative studies against the myopic path planning methods. The proposed framework is rigorously evaluated across three scenarios, investigating its performance under different starting positions and pollutant source terms. The testing scenarios, which reflects real-world conditions such as oil spills and chemical leaks, help assess the robustness and adaptability of the framework. A sensitivity analysis is conducted to guide the fine tuning of the path planning strategy. Comparative studies highlight the superior performance of the proposed framework, with the combination of expected information gain (EIG)-based utility and MCTS consistently achieving the lowest reconstruction error and demonstrating enhanced robustness in dynamic and uncertain environments. These results establish the framework as a significant advancement in autonomous environmental monitoring, offering a new solution for dynamic pollution tracking and management.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"156 ","pages":"Article 104458"},"PeriodicalIF":4.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419348","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