Ocean Engineering最新文献

英文中文

OWP-LIO: A method and experimental study for pose measurement of offshore wind power O&M vessels using Lidar-Inertial odometry

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120107

Yu Deng , Wenhan Zhang , Weikang Li , Songlin Zhou , Xianchao Zhao , Weixing Chen

Accurate vessel positioning is crucial for operating and maintaining wind power access systems. This study explores Lidar-Inertial Odometry (LIO) as a cost-effective alternative to traditional, expensive IMUs. In offshore wind power operations and maintenance, traditional LIO faces challenges in gravity estimation during initialization and map updating due to vessel movement and limited motion range, complicating high-dynamic scenarios. To address these issues, we propose OWP-LIO, which integrates three components: preprocessing with plane reference gravity estimation for initialization, state estimation using IEKF, and real-time map updating. Experiments in offshore environments, using traditional IMU measurements as ground truth, show that OWP-LIO, using the plane reference gravity estimation method, achieves a 24.6% reduction in RMSE in the heave direction compared to conventional methods. Additionally, land-based ablation experiments simulating highly dynamic and short-range motion demonstrate that the real-time map update reduces point cloud map size by 38.8% and processing time per frame by 8.7%, leading to decreased system resource consumption. In offshore trials, in which traditional IMU data serves as the ground truth, OWP-LIO maintains RMSE within 1 cm in heave and 0.1° in roll and pitch, while reducing costs to 9.6% of traditional IMUs.

{"title":"OWP-LIO: A method and experimental study for pose measurement of offshore wind power O&M vessels using Lidar-Inertial odometry","authors":"Yu Deng , Wenhan Zhang , Weikang Li , Songlin Zhou , Xianchao Zhao , Weixing Chen","doi":"10.1016/j.oceaneng.2024.120107","DOIUrl":"10.1016/j.oceaneng.2024.120107","url":null,"abstract":"<div><div>Accurate vessel positioning is crucial for operating and maintaining wind power access systems. This study explores Lidar-Inertial Odometry (LIO) as a cost-effective alternative to traditional, expensive IMUs. In offshore wind power operations and maintenance, traditional LIO faces challenges in gravity estimation during initialization and map updating due to vessel movement and limited motion range, complicating high-dynamic scenarios. To address these issues, we propose OWP-LIO, which integrates three components: preprocessing with plane reference gravity estimation for initialization, state estimation using IEKF, and real-time map updating. Experiments in offshore environments, using traditional IMU measurements as ground truth, show that OWP-LIO, using the plane reference gravity estimation method, achieves a 24.6% reduction in RMSE in the heave direction compared to conventional methods. Additionally, land-based ablation experiments simulating highly dynamic and short-range motion demonstrate that the real-time map update reduces point cloud map size by 38.8% and processing time per frame by 8.7%, leading to decreased system resource consumption. In offshore trials, in which traditional IMU data serves as the ground truth, OWP-LIO maintains RMSE within 1 cm in heave and 0.1° in roll and pitch, while reducing costs to 9.6% of traditional IMUs.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120107"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094788","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

Effectiveness of deck-isolation and viscous dampers supplement on enhancing seismic performance of offshore jacket platforms

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120039

S. Dashti , K. Tarbali , C. Zhou , J.G. Chase

Offshore structures, mainly used for oil production, are increasingly being adapted for renewable energy applications. Seismic performance assessment of these structures is generally conducted using a limited number of ground motions without taking due account of the site's seismic hazard. In this study, a detailed seismic assessment is performed on a typical offshore jacket platform as well as its two modified versions, equipped with an isolation system comprising low-damping rubber bearings and dampers. These dampers include velocity-dependent 1–4 viscous dampers, direction- and displacement-dependent 2–4 dampers, and direction- and displacement-dependent 1–3 dampers. For each structure, 13 ensembles of ground motions are selected (each containing 20 records) compatible with the site's seismic hazard at 13 exceedance levels using the generalized conditional intensity measure methodology. The results at both the jacket cap and deck level are presented in terms of the reductions in median and maximum displacement and acceleration, as well as the base shear. Application of 1–4 damper with 20% damping ratio in the isolated structure resulted in reductions up to 84% and 34% in median displacement and 56% and 88% in median acceleration at the jacket cap and deck levels, respectively, while also decreasing median base shear by up to 71%.

{"title":"Effectiveness of deck-isolation and viscous dampers supplement on enhancing seismic performance of offshore jacket platforms","authors":"S. Dashti , K. Tarbali , C. Zhou , J.G. Chase","doi":"10.1016/j.oceaneng.2024.120039","DOIUrl":"10.1016/j.oceaneng.2024.120039","url":null,"abstract":"<div><div>Offshore structures, mainly used for oil production, are increasingly being adapted for renewable energy applications. Seismic performance assessment of these structures is generally conducted using a limited number of ground motions without taking due account of the site's seismic hazard. In this study, a detailed seismic assessment is performed on a typical offshore jacket platform as well as its two modified versions, equipped with an isolation system comprising low-damping rubber bearings and dampers. These dampers include velocity-dependent 1–4 viscous dampers, direction- and displacement-dependent 2–4 dampers, and direction- and displacement-dependent 1–3 dampers. For each structure, 13 ensembles of ground motions are selected (each containing 20 records) compatible with the site's seismic hazard at 13 exceedance levels using the generalized conditional intensity measure methodology. The results at both the jacket cap and deck level are presented in terms of the reductions in median and maximum displacement and acceleration, as well as the base shear. Application of 1–4 damper with 20% damping ratio in the isolated structure resulted in reductions up to 84% and 34% in median displacement and 56% and 88% in median acceleration at the jacket cap and deck levels, respectively, while also decreasing median base shear by up to 71%.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120039"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094279","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

AIS data-driven analysis for identifying cargo handling events in international trade tankers

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120016

Ran Zhang , Daozhu Dong , Xiaohui Chen , Bing Zhang , Yixuan Zhang , Lin Ye , Bing Liu , Ying Zhao , Chunyan Peng

Accurate identification of vessel cargo handling events in maritime transportation is pivotal for analyzing dynamics in international commodity trade. However, existing methods for identifying vessel cargo handling events based on Automatic Identification System data are constrained by the time lag of draught attributes, leading to deviations in the spatiotemporal attributes of event identification results and compromising the accuracy of cargo transportation monitoring. To address this issue, our study proposes an identification process for international trade tanker cargo handling events. The process first identifies significant changes in vessel draught, calculates the current loading or unloading quantities using the change in draught combined with the Tons per Centimeter Immersion metric, and extracts candidate trajectory segments. Subsequently, for these candidate segments, a Gaussian Mixture Model is employed to dynamically calculate the mooring speed threshold, enabling the identification of the vessel's mooring point closest in time to the draught change. The duration and location of the mooring point are then used to determine the time and location of the vessel cargo handling event. Experimental results demonstrate that the proposed process effectively overcomes the time lag in AIS draught attributes, reduces missed identifications and significantly improves the precision of tanker cargo handling event identification.

{"title":"AIS data-driven analysis for identifying cargo handling events in international trade tankers","authors":"Ran Zhang , Daozhu Dong , Xiaohui Chen , Bing Zhang , Yixuan Zhang , Lin Ye , Bing Liu , Ying Zhao , Chunyan Peng","doi":"10.1016/j.oceaneng.2024.120016","DOIUrl":"10.1016/j.oceaneng.2024.120016","url":null,"abstract":"<div><div>Accurate identification of vessel cargo handling events in maritime transportation is pivotal for analyzing dynamics in international commodity trade. However, existing methods for identifying vessel cargo handling events based on Automatic Identification System data are constrained by the time lag of draught attributes, leading to deviations in the spatiotemporal attributes of event identification results and compromising the accuracy of cargo transportation monitoring. To address this issue, our study proposes an identification process for international trade tanker cargo handling events. The process first identifies significant changes in vessel draught, calculates the current loading or unloading quantities using the change in draught combined with the Tons per Centimeter Immersion metric, and extracts candidate trajectory segments. Subsequently, for these candidate segments, a Gaussian Mixture Model is employed to dynamically calculate the mooring speed threshold, enabling the identification of the vessel's mooring point closest in time to the draught change. The duration and location of the mooring point are then used to determine the time and location of the vessel cargo handling event. Experimental results demonstrate that the proposed process effectively overcomes the time lag in AIS draught attributes, reduces missed identifications and significantly improves the precision of tanker cargo handling event identification.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120016"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094667","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

Analysis of skewness/kurtosis evolution and energy modulation induced by the interaction of focused waves with barrier arrays

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120118

Liang Kong , Chengguang Lai , Xuefang Li

Extreme waves, characterized by sudden onset and high destructiveness, present significant risks to offshore structures, vessels, and personnel due to their considerable energy and wave height. Research indicates that geometric focusing and abrupt depth transition are crucial in forming these waves. This study examined the interaction between focused waves and submerged barriers arrays using the OpenFOAM and its waves2Foam library. By varying operating conditions, the study investigated these interactions by analysing parameters such as wave focus amplitude, and barrier's width, height and number. The analysis covered statistical characteristics, energy distribution. The results show that the presence of a submerged barrier significantly increases skewness and slightly raises kurtosis at the structure's rear, while it also enhances the asymmetry coefficient and maximum wave height; Reflection and refraction effects at the barrier enhance energy in the second harmonic frequency range (1.5–2.5 Hz) for single structures, with arrays further amplifying energy at higher frequencies. This work exploits the propagation and evolution of the focused waves after interacting with the submerged barrier and helps to understand the complexity of the interaction between the submerged barrier and focused waves.

{"title":"Analysis of skewness/kurtosis evolution and energy modulation induced by the interaction of focused waves with barrier arrays","authors":"Liang Kong , Chengguang Lai , Xuefang Li","doi":"10.1016/j.oceaneng.2024.120118","DOIUrl":"10.1016/j.oceaneng.2024.120118","url":null,"abstract":"<div><div>Extreme waves, characterized by sudden onset and high destructiveness, present significant risks to offshore structures, vessels, and personnel due to their considerable energy and wave height. Research indicates that geometric focusing and abrupt depth transition are crucial in forming these waves. This study examined the interaction between focused waves and submerged barriers arrays using the OpenFOAM and its waves2Foam library. By varying operating conditions, the study investigated these interactions by analysing parameters such as wave focus amplitude, and barrier's width, height and number. The analysis covered statistical characteristics, energy distribution. The results show that the presence of a submerged barrier significantly increases skewness and slightly raises kurtosis at the structure's rear, while it also enhances the asymmetry coefficient and maximum wave height; Reflection and refraction effects at the barrier enhance energy in the second harmonic frequency range (1.5–2.5 Hz) for single structures, with arrays further amplifying energy at higher frequencies. This work exploits the propagation and evolution of the focused waves after interacting with the submerged barrier and helps to understand the complexity of the interaction between the submerged barrier and focused waves.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120118"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094706","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 wave forces on two side-by-side barges subjected to nonlinear focused wave groups

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120056

Chenglong Mi , Junliang Gao , Zhiwei Song , Yingyi Liu

Violent fluid resonance may occur in the narrow gaps formed by multiple marine floating structures arranged side-by-side, which heavily threatens the safety of operation, more seriously, and leads to the catastrophic failure of marine equipment. Based on a two-dimensional viscous flow model, this work aims to study the impacts of incident wave parameters, e.g., amplitude and spectral peak period, on the nonlinear transient features of wave loads acting on two side-by-side boxes, where the transient focusing wave group close to the real sea state is mainly concerned. At the same time, the weather-side box is allowed to freely heave motion using the overset mesh method, which overcomes the problem of calculation divergence caused by excessive motion of the traditional moving mesh. In addition, the effect of higher-order harmonic components on the overall hydrodynamic wave force is also investigated using the four-phase combination method. It is found that the period for the peak values of the amplitude-period curve of wave force and moment on the lee-side box is always larger than that on the weather-side box. Moreover, the impact of different incident parameters on the higher-order harmonic components is also distinct for varied physical quantities.

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引用次数: 0

Numerical investigations of ship hydroelasticity of a 20,000 TEU containership based on CFD-MBD method

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120061

Wenjie Zhang , Jianhua Wang , Hao Guo , Yi Liu , Decheng Wan

In this paper, a fully coupled fluid-structure interaction method is proposed to study ship hydroelastic responses. A two-way coupling of CFD (Computational Fluid Dynamics) and MBD (Multi-Body Dynamics) solvers is applied to the numerical study of a 20,000 TEU containership. The flow field is solved using the RANS equations in OpenFOAM, while the structural dynamic responses are calculated using a beam model in MBDyn. Another open-source library, preCICE, is utilized for data exchange between the fluid and structural components in the coupling algorithm. The numerical results for the Response Amplitude Operators (RAOs) of ship motion and vertical bending moment (VBM) at midship are validated against experimental data under different wavelengths. Additionally, the hydroelastic responses are analyzed. The longitudinal distribution trends of the VBM under different wavelengths show a consistent pattern, with maximum hogging and sagging values occurring around the midship area. The maximum VBM responses are observed under conditions of λ/L = 0.8 and λ/L = 0.9, exhibiting significant high-frequency harmonic components. The comparison between numerical predictions of VBM for elastic and rigid ship body structures reveals a significant underestimation of VBM for rigid ships, even in relatively low sea conditions. This finding demonstrates the necessity of considering elasticity in the calculations of hydroelastic responses for ultra-large container ships.

{"title":"Numerical investigations of ship hydroelasticity of a 20,000 TEU containership based on CFD-MBD method","authors":"Wenjie Zhang , Jianhua Wang , Hao Guo , Yi Liu , Decheng Wan","doi":"10.1016/j.oceaneng.2024.120061","DOIUrl":"10.1016/j.oceaneng.2024.120061","url":null,"abstract":"<div><div>In this paper, a fully coupled fluid-structure interaction method is proposed to study ship hydroelastic responses. A two-way coupling of CFD (Computational Fluid Dynamics) and MBD (Multi-Body Dynamics) solvers is applied to the numerical study of a 20,000 TEU containership. The flow field is solved using the RANS equations in OpenFOAM, while the structural dynamic responses are calculated using a beam model in MBDyn. Another open-source library, preCICE, is utilized for data exchange between the fluid and structural components in the coupling algorithm. The numerical results for the Response Amplitude Operators (RAOs) of ship motion and vertical bending moment (VBM) at midship are validated against experimental data under different wavelengths. Additionally, the hydroelastic responses are analyzed. The longitudinal distribution trends of the VBM under different wavelengths show a consistent pattern, with maximum hogging and sagging values occurring around the midship area. The maximum VBM responses are observed under conditions of λ/L = 0.8 and λ/L = 0.9, exhibiting significant high-frequency harmonic components. The comparison between numerical predictions of VBM for elastic and rigid ship body structures reveals a significant underestimation of VBM for rigid ships, even in relatively low sea conditions. This finding demonstrates the necessity of considering elasticity in the calculations of hydroelastic responses for ultra-large container ships.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120061"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094713","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

Assessing long short-term memory network significant wave height forecast efficacy in the Caribbean Sea and Northwestern Atlantic Ocean

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120045

Brandon J. Bethel , Changming Dong , Shuyi Zhou , Wenjin Sun , Yilin Bao

Precise wave forecasts are crucial, but few studies have directly tested artificial intelligence forecast efficacies in different wave regimes. Using ten years of buoy observations and Simulating WAves Nearshore (SWAN) simulations, the wave climates of the Caribbean Sea (CS) and Northwestern Atlantic Ocean (NWAO) are studied from 2010 to 2019. SWAN simulations are used to replace fragmentary buoy observations and then forecasting using the Long Short-Term Memory (LSTM) network is initiated on six sites throughout the CS and NWAO. Although expected, results illustrate that regardless of test site, LSTM forecasts were highly accurate, reaching correlation values of >0.8, root-mean-square errors <0.4 m, and mean average percentage errors of <14% up to 12-hr forecast horizons. Location-specific geographic and metocean attributes led to divergent forecast outcomes between test sites. Forecast correlations were higher near, but not directly under the Caribbean Low-Level Jet, leading to the best forecast results in the western CS, followed by the central CS, and was poorest in the NWAO. It was conclusively determined NWAO and CS wave fields are sufficiently different to ensure that forecasting using information from either subregion on its counterpart would lead to low correlations and unacceptably high levels of error.

{"title":"Assessing long short-term memory network significant wave height forecast efficacy in the Caribbean Sea and Northwestern Atlantic Ocean","authors":"Brandon J. Bethel , Changming Dong , Shuyi Zhou , Wenjin Sun , Yilin Bao","doi":"10.1016/j.oceaneng.2024.120045","DOIUrl":"10.1016/j.oceaneng.2024.120045","url":null,"abstract":"<div><div>Precise wave forecasts are crucial, but few studies have directly tested artificial intelligence forecast efficacies in different wave regimes. Using ten years of buoy observations and Simulating WAves Nearshore (SWAN) simulations, the wave climates of the Caribbean Sea (CS) and Northwestern Atlantic Ocean (NWAO) are studied from 2010 to 2019. SWAN simulations are used to replace fragmentary buoy observations and then forecasting using the Long Short-Term Memory (LSTM) network is initiated on six sites throughout the CS and NWAO. Although expected, results illustrate that regardless of test site, LSTM forecasts were highly accurate, reaching correlation values of >0.8, root-mean-square errors <0.4 m, and mean average percentage errors of <14% up to 12-hr forecast horizons. Location-specific geographic and metocean attributes led to divergent forecast outcomes between test sites. Forecast correlations were higher near, but not directly under the Caribbean Low-Level Jet, leading to the best forecast results in the western CS, followed by the central CS, and was poorest in the NWAO. It was conclusively determined NWAO and CS wave fields are sufficiently different to ensure that forecasting using information from either subregion on its counterpart would lead to low correlations and unacceptably high levels of error.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120045"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094716","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

Very short-term forecasting of ship multidimensional motion using two coupled models based on deep operator networks

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120044

Jinxiu Zhao , Yong Zhao

To achieve simultaneous learning and prediction of multi-degree-of-freedom (DOF) motion, thereby improving the efficiency and accuracy of ship motion forecasting, two multi-DOF coupled motion prediction models: the Single-Branch Coupled Model and the Multi-Branch Coupled Model, are constructed based on the Deep Operator Network (DeepONet) framework in this paper. By segmenting and augmenting the Branch net for multi-dimensional inputs, and dividing the dot product results of the Branch net and Trunk net output data into multi-dimensions for multi-dimensional outputs, both models are respectively used for single and multi-DOF forecasts employing ship model towing experiment data. The prediction results clearly demonstrate the significant advantages of the two models in terms of prediction accuracy and step size. Compared to the DeepONet model, when conducting single-step predictions, under the Mean Squared Error (MSE) standard, the prediction accuracy of the Single-Branch coupled model increased by 97.49%, while that of the Multi-Branch coupled model improved by 112.46%. By employing motion data from multiple DOF to predict roll, pitch, and heave, the approach enables simultaneous forecasts for these three DOF. The Multi-Branch Coupled Model constructed in this paper has not only improved efficiency but also significantly enhanced accuracy, indicating a clear advantage in the very short-term application of ships.

{"title":"Very short-term forecasting of ship multidimensional motion using two coupled models based on deep operator networks","authors":"Jinxiu Zhao , Yong Zhao","doi":"10.1016/j.oceaneng.2024.120044","DOIUrl":"10.1016/j.oceaneng.2024.120044","url":null,"abstract":"<div><div>To achieve simultaneous learning and prediction of multi-degree-of-freedom (DOF) motion, thereby improving the efficiency and accuracy of ship motion forecasting, two multi-DOF coupled motion prediction models: the Single-Branch Coupled Model and the Multi-Branch Coupled Model, are constructed based on the Deep Operator Network (DeepONet) framework in this paper. By segmenting and augmenting the Branch net for multi-dimensional inputs, and dividing the dot product results of the Branch net and Trunk net output data into multi-dimensions for multi-dimensional outputs, both models are respectively used for single and multi-DOF forecasts employing ship model towing experiment data. The prediction results clearly demonstrate the significant advantages of the two models in terms of prediction accuracy and step size. Compared to the DeepONet model, when conducting single-step predictions, under the Mean Squared Error (MSE) standard, the prediction accuracy of the Single-Branch coupled model increased by 97.49%, while that of the Multi-Branch coupled model improved by 112.46%. By employing motion data from multiple DOF to predict roll, pitch, and heave, the approach enables simultaneous forecasts for these three DOF. The Multi-Branch Coupled Model constructed in this paper has not only improved efficiency but also significantly enhanced accuracy, indicating a clear advantage in the very short-term application of ships.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"317 ","pages":"Article 120044"},"PeriodicalIF":4.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094717","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

Application of tomographic reconstruction techniques to quantify multiphase flows during sloshing model tests

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120034

Simon Tödter , Hemant Sagar , Michael Thome , Dirk Michaelis , Knut Mannel , Jens Neugebauer , Ould el Moctar , Thomas E. Schellin

Sloshing in partially filled tanks induces dynamic loads on tank walls and structures inside the tank. Internal structures influence the flow and may lead to ventilation effects that generate a gas-liquid mixture. Entrapped and dissolved gas alters the properties of the liquid phase, which typically reduces impact loads. In the present study, non-invasive tomographic reconstruction techniques were applied to optically capture entrapped air in a sloshing model-scale tank. The simultaneous multiplicative algebraic reconstruction technique (SMART) and the multiplicative line-of-sight (MLOS) technique were used to quantify entrapped air. Results showed that the accuracy of the calculated air volumes depends significantly on the image pre-processing as well as on the selected reconstruction settings. A predefined test case was used to adjust the processing and to validate the reconstruction results. Induced single bubbles were captured while the tank oscillated, exciting the fluid in resonance. Associated trajectories of the rising bubbles were captured, compared, and analyzed. The applied tomographic techniques were capable to reconstruct the required volume of interest for single bubbles and bubble clouds. Tank motions did not limit measurement capabilities as the camera setup moved along with tank motions.

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引用次数: 0

A numerical and experimental research on solitary wave impacts on a flexible wall

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.oceaneng.2024.120072

Jian Yang , Zhaochen Sun , Jiayang Gu , Xiaojian Ma , Shuxiu Liang

Hydroelastic effects play a significant role in the structural response during water wave impacts. This paper investigates three kinds of solitary wave impacts on a flexible wall, specifically slightly-breaking impacts, low-aeration impacts, and high-aeration impacts. To carry out this research, a method combining model experiments and numerical simulations is employed. For the simulations, a two-way coupling method is utilized to capture the intricate fluid-structure interaction that occurs during impacts. This numerical approach can substantially reduce the need for simplification when tackling complex real-world problems, thereby enhancing the precision of the simulations. The experimental and numerical results can reveal some characteristics of wave surface evolution, flow field, impact pressure, and structural response. Notably, the structural deformation curve exhibits a saddle-shaped feature. The envelopes of impact pressure time histories follow similar trends as the structural deflection, but in aeration impacts, the pressures can oscillate at higher frequencies. Vorticity is observed above the wave front and in the trapped air bubbles during the impact, but minimal vorticity in the water. In addition, the analysis of the energy of the structure reveals that the strain energy accounts for a significant proportion of the total energy, while the kinetic energy contributes only a small fraction.

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引用次数: 0

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