Ocean Engineering最新文献

{"title":"Structural response analysis of different submerged floating tunnel route selection conditions in the complex strait under the action of typhoon Sepat","authors":"Cheng Cui ,&nbsp;Bo Huang ,&nbsp;Minglin Chen ,&nbsp;Wenlong Luo ,&nbsp;Jianting Zhou ,&nbsp;Hao Ding ,&nbsp;Ke Li ,&nbsp;Liang Cheng ,&nbsp;Dan Zhong ,&nbsp;Jiawei Zhou","doi":"10.1016/j.oceaneng.2025.121072","DOIUrl":"10.1016/j.oceaneng.2025.121072","url":null,"abstract":"<div><div>The submerged floating tunnel (SFT), a newly proposed tunnel engineering concept, will replace traditional sea-crossing bridges potentially. The SFT has the advantages of the cost, environmental protection, and terrain adaptability. Existing route proposals for SFT suggest its possible construction in the strait on the western coast of the Pacific Ocean. However, these straits are frequently threatened by typhoon disasters, making it crucial to study the mechanical response of SFT under extreme marine environmental conditions. Therefore, this study has focused on the strait in it and utilized the ADCIRC hydrodynamic model and the SWAN wave model to assess storm surge disaster risks in the region. The finite element software ABAQUS has been used to model the SFT. The study has discussed the spatiotemporal heterogeneity of the coupled response between typhoon waves and the SFT, and the sensitivity of structural parameters under extreme marine conditions. The results indicate that: (1) The dynamic response of the SFT during the movement of the typhoon showed significant variation. (2) Increasing the elastic modulus and diameter of the cables significantly reduced the mechanical response fluctuation of SFT caused by typhoon. (3) The submerged depth of the SFT in the Penghu channel section was suggested to be set to 55–65 m when the typhoon is considered.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121072"},"PeriodicalIF":4.6,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725479","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}

{"title":"ADP-based secure trajectory tracking for unmanned surface vehicles with false data injections","authors":"Yanwei Huang,&nbsp;Guozhen Lai","doi":"10.1016/j.oceaneng.2025.121043","DOIUrl":"10.1016/j.oceaneng.2025.121043","url":null,"abstract":"<div><div>To suppress false data injection (FDI) attacks, a back-stepping (BS) control with the compensator of game approximate dynamic programming (GADP) (BS-GADP) is proposed to securely track trajectory for unmanned surface vehicle (USV). Firstly, a nonlinear parameter-varying (NPV) model with FDI is established for USV. Secondly, approximate dynamic programming (ADP) based virtual guidance law (VGL) is proposed with an equivalent VGL (EVGL) and a compensatory VGL (CVGL) by ADP to reduce the guidance cost. Thirdly, GADP compensator is proposed to improve the BS controller by the uniformly ultimately bounded (UUB) stability conditions, which is derived by the Lyapunov function of dynamic error for the affection of FDI. Moreover, GADP compensator is implemented by zero-sum game value iterative (ZSG-VI) algorithm. Finally, simulations and experiments show that BS-GADP system performance excels in resisting FDI for secure trajectory tracking.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121043"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725482","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}

{"title":"Finite-time terminal sliding mode control strategy for the unmanned surface vehicle with composite disturbances","authors":"Yixin Su ,&nbsp;Chenglong Gong ,&nbsp;Zhengying Li ,&nbsp;Danhong Zhang ,&nbsp;Ming Xu","doi":"10.1016/j.oceaneng.2025.121036","DOIUrl":"10.1016/j.oceaneng.2025.121036","url":null,"abstract":"<div><div>This work investigates the trajectory tracking control problem of an unmanned surface vehicle (USV) subject to composite disturbances, including both matched and unmatched disturbances, with unmeasurable velocities. To tackle this challenging issue, a finite-time control strategy is proposed that combines unknown state estimation with terminal sliding mode control (TSMC) techniques. First, a novel dynamic system for USV trajectory tracking is formulated, allowing the simultaneous handling of composite disturbances and unknown velocities within a unified control framework. Subsequently, an extended state observer (ESO) is designed to estimate the unknown states in the dynamic system, and to provide effective approximation of the unknown complex term with the finite-time convergence of estimation errors. Building on the ESO and the sliding mode control technique, a finite-time TSMC strategy with a dual-layer adaptive update law is proposed, achieving finite-time convergence of the closed-loop system while reducing chattering. Moreover, Lyapunov functions are constructed to prove the finite-time convergence of the USV's tracking errors and the stability of the dual-layer adaptive update law. Finally, the numerical simulation on a fully-actuated USV validates the effectiveness and superiority of the proposed control strategy.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121036"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725488","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}

{"title":"Construction accuracy evaluation of ship stiffened panel based on 3D model reconstruction","authors":"Jun Li ,&nbsp;Zhen Chen ,&nbsp;Puhao Lei ,&nbsp;Dongyang Li ,&nbsp;Junan Yi","doi":"10.1016/j.oceaneng.2025.121060","DOIUrl":"10.1016/j.oceaneng.2025.121060","url":null,"abstract":"<div><div>Fabrication-induced deformation throughout various stages of shipbuilding significantly affects construction accuracy. The accuracy evaluation of ship interim products is therefore essential for improving assembly quality and optimizing manufacturing process. However, traditional manual measurement methods merely yield discrete geometric information rather than overall structural deformation. This paper develops a comprehensive methodology for evaluating construction accuracy of ship stiffened panels based on 3D scanning technology. First, the scanning point clouds are divided into representative horizontal slices using a specific slicing strategy to simplify computational complexity. Then, a slice-based plane segmentation method is adopted to identify and segment different components of ship structures. On this basis, 3D surface parametric model of each component is reconstructed by higher-order panel element generation, facilitating accuracy assessment of structures. Experiments on two typical ship stiffened panels are conducted to verify the effectiveness of this method, and the construction accuracy of the specimens are systematically evaluated.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121060"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715567","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}

{"title":"Hydrodynamic performance and narrow gap resonance of WEC-floating breakwater hybrid system: An experimental study","authors":"Binzhen Zhou ,&nbsp;Chusen Lin ,&nbsp;Xu Huang ,&nbsp;Qi Zhang ,&nbsp;Yuan Yuming ,&nbsp;Hengming Zhang ,&nbsp;Peng Jin ,&nbsp;Yifeng Yang","doi":"10.1016/j.oceaneng.2025.121040","DOIUrl":"10.1016/j.oceaneng.2025.121040","url":null,"abstract":"<div><div>Wave energy is a significant ocean renewable resource with vast reserves and wide distribution. Integrating a wave energy converter (WEC) and a floating breakwater offers an effective answer to promote its commercialization. In this study, model tests are conducted to investigate the wave energy absorption and attenuation performance of the WEC-breakwater hybrid system with various WEC geometries, focusing on narrow-gap resonance. Optimal configurations for gap width and WEC dimensions were identified. The results reveal a significant improvement in both energy absorption and wave attenuation performance of the WEC-breakwater hybrid system compared to single WEC or single breakwater. Particularly, the hybrid system with an asymmetric triangle-baffle WEC exhibits broader efficiency range frequency and superior wave energy conversion efficiency, while also enhancing the wave reduction capabilities of the floating breakwater for short waves. Effects of the narrow gap resonance on the hybrid systems with symmetric and asymmetric WECs differ. The system with a narrower gap and a slender WEC exhibits better wave energy absorption performance, but the influence on wave attenuation is found to be limited. These findings could provide valuable recommendations for designing WEC-breakwater hybrid systems, helping to avoid unnecessary costs resulting from improper design.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121040"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725487","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}

{"title":"Machine learning approaches to predict significant wave height and assessment of model uncertainty","authors":"S. Sithara,&nbsp;Akhila Unni,&nbsp;S.K. Pramada","doi":"10.1016/j.oceaneng.2025.121039","DOIUrl":"10.1016/j.oceaneng.2025.121039","url":null,"abstract":"<div><div>Precise prediction of significant wave height (SWH) is crucial for marine operations and coastal management. Different methods like machine learning (ML) and numerical techniques can be used for SWH modeling. Quantifying the uncertainty in SWH predictions from these models is crucial for selecting the appropriate modeling approach. The SWH at three locations along India's west coast, Jaitapur, Mumbai, and Kochi, were modeled employing three different ML approaches: Artificial Neural Network (ANN), Support Vector Machine (SVM), and Long Short-Term Memory (LSTM). The critical ocean and atmospheric variables that impact SWH at these locations were determined to be total precipitation and horizontal and vertical wind speed components measured 10 m above the sea surface. The performance of the three ML models was evaluated using statistical metrics and graphical indicators. Uncertainty in SWH predictions stemming from each model was assessed using Bootstrap Resampling and Quantile Regression. The performance evaluation results revealed that ANN and LSTM outperformed the SVM model regarding SWH predictions. The trend in SWH from LSTM and ANN models matched reanalysis data trends at all three locations. Furthermore, it was discerned that the uncertainty in SWH predictions is higher with the SVM model, followed by the LSTM and ANN models.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121039"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725489","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}

{"title":"Fully-coupled load-stress analysis of a floating offshore wind turbine for a parked design load case using HydroQus","authors":"Dong Ho Yoon,&nbsp;Joonmo Choung","doi":"10.1016/j.oceaneng.2025.121004","DOIUrl":"10.1016/j.oceaneng.2025.121004","url":null,"abstract":"<div><div>For design of a floating offshore wind turbine (FOWT), time-domain load analysis including aerodynamic and hydrodynamic forces is essential. Because commonly used load analysis tools of OrcaFlex and OpenFAST do not account for non-slender substructure's elasticity, HydroQus, a hydrodynamic plug-in for Abaqus/Explicit, was used to obtain stress process in substructure. Load analysis for a 10MW FOWT, consisting of a semi-submersible substructure with three catenary mooring lines, was conducted for design load case (DLC6.2). Elastic and rigid shell elements were alternatively used for geometric modeling of the tower and substructure to view the elasticity effect. DLC6.2 represents a parked condition, so rotor aerodynamics were ignored and the rotor-nacelle assembly was modeled using rigid elements. The mooring lines were modeled using beam and joint elements. To apply the drag forces, additional beam elements were placed along the tower and substructure columns. The load analysis results using HydroQus were validated by comparing OrcaFlex results. For the rigid element model, HydroQus and OrcaFlex showed highly consistent motion and mooring tension histories. For the elastic element model, stress mostly developed at two interfaces: the substructure column-deck connections, and the tower base. Due to the substructure elasticity, HydroQus produced a reduced mooring tension history than OrcaFlex.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121004"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715565","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}

{"title":"Hierarchical speed control of an infinitely variable transmission in tidal current energy converters using integral reinforcement learning","authors":"Zhichang Qin ,&nbsp;Gang Li ,&nbsp;Weidong Zhu ,&nbsp;William Mayfield","doi":"10.1016/j.oceaneng.2025.121068","DOIUrl":"10.1016/j.oceaneng.2025.121068","url":null,"abstract":"<div><div>This paper presents a novel data-driven internal reinforcement learning (IRL)-based optimal speed control of an infinitely variable transmission (IVT) for tidal current energy converters (TCECs). The main objective of this study is to develop an effective control strategy that can maintain a stable output speed of the IVT system under varying tidal current conditions without relying solely on a dynamic model. The proposed method integrates a crank length controller with an IRL-based speed controller. The crank length controller adjusts the speed ratio of the IVT in real time, while the IRL-based speed controller optimizes the input speed using only sampled input-output data. An actor-critic neural network architecture is used to approximate the optimal control policy. The performance of the proposed approach is validated through simulations under both constant and time-varying tidal speed scenarios. Control results demonstrate that the data-driven IRL-based speed control approach of the IVT can effectively regulate its output speed with average tracking errors of 2.6 % for time-varying inputs and 6.3 % for constant inputs, outperforming traditional proportional-derivative control. This data-driven method eliminates the need for complex dynamic modeling of the IVT system, offering a more practical and adaptable solution for TCEC applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121068"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725486","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}

{"title":"A novel two-way coupled algorithm of time-domain hydro-elastic analysis for free-end offshore floating structures using inertia relief method","authors":"Min Jun Lee ,&nbsp;Miaozi Zheng ,&nbsp;Seung Jae Lee ,&nbsp;Yu Zhang ,&nbsp;Jae Hyuk Hwang ,&nbsp;Menglan Duan","doi":"10.1016/j.oceaneng.2025.121032","DOIUrl":"10.1016/j.oceaneng.2025.121032","url":null,"abstract":"&lt;div&gt;&lt;div&gt;This study proposes an efficient two-way coupling algorithm between fluid and structure domains, integrating a Boundary Element Method (BEM) solver for potential fluid analysis with a Finite Element Method (FEM) solver for shell theory calculations. To represent realistic physical phenomena without artificial boundary conditions, an inertia relief method is implemented at the fluid-structure interface. The fluid domain analysis is conducted through a Fortran-based numerical code that calculates incident, diffraction, and radiation potentials, while ABAQUS serves as the FEM solver for structural analysis with subroutine interfaces. The algorithm introduces an element-based calculation approach, where frequency-dependent hydrodynamic properties, including pressure transfer functions, added mass, and linear damping coefficients, are pre-processed through the subroutine interface. These properties are transformed into time-dependent coefficients using the expanded Impulse Response Function (IRF) theory, incorporating added mass at infinite frequency, retardation functions, and wave exciting pressures. The coupling mechanism facilitates continuous communication between two domains through the exchange of motion and force vectors at each time step, enabling efficient representation of fluid-structure interactions. The validation process consisted of three phases: (1) verification of the expanded IRF theory by comparing element-based calculations with conventional methods; (2) comparison of rigid body motion Response Amplitude Operators (RAOs) with commercial software ANSYS AQWA and RADIS (Radiation and Diffraction Solver, developed by Korea Maritime and Ocean University); and (3) validation of elastic responses through experimental data comparison, focusing on vertical displacement RAOs. The comparisons showed good agreement across various wave heading angles and frequencies, with minor discrepancies observed at the longitudinal edges of the model, which were primarily attributed to the simplified drift-control system in the experimental setup and scale effects. The comprehensive validation demonstrates the reliability of the proposed method within the tested parameter ranges. Regarding computational efficiency, the method requires approximately 5 times real-time processing (i.e., 1 s of simulation requires 5.16 s of computation using a single CPU core), making it practical for engineering applications. Additionally, the validated method was applied to a large-scale Floating Offshore Wind Turbine (FOWT), incorporating mooring system and aerodynamic loads sequentially. Results were compared with OpenFAST (open-source code) and OrcaFlex (commercial software) to verify the analytical reliability. While differences in transient section and low-frequency motion were observed due to variations in mooring system analysis methods and aerodynamic load interaction algorithms, these aspects warrant further investigation in future work. Previous studies ","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121032"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715566","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}

{"title":"Wave power absorption by floating plates with application to piezoelectric or other bending-based absorption","authors":"Michael H. Meylan ,&nbsp;Vivien J. Challis ,&nbsp;Ngamta Thamwattana ,&nbsp;Zachary J. Wegert ,&nbsp;Ben Wilks","doi":"10.1016/j.oceaneng.2025.120931","DOIUrl":"10.1016/j.oceaneng.2025.120931","url":null,"abstract":"<div><div>The wave scattering, motion, and energy absorption for a floating elastic plate that has an imaginary part to the bending rigidity in the frequency domain is found using an expansion in modes and a Green’s function. This imaginary part appears when energy is extracted from bending and arises in particular when the piezoelectric effect is used to absorb wave energy. However, it can also appear in other flexible wave-energy converters. The solution for a single plate is extended to multiple plates and various boundary conditions are investigated. A general energy identity is found showing that the energy absorption must be proportional to an integral over the plate of the imaginary part of the bending stiffness multiplied by the second derivative of the displacement squared. Various results investigating the absorption of energy are given, and simulations are presented in the time domain.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 120931"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725483","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}