Ocean Engineering最新文献

英文中文

Experimental study of pressure distribution and wave forces on pile groups under extreme waves

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120872

Xi Yu, Jiajia Wang, Wanshui Han, Lili Xiao, Xin Xu, Kai Zhou, Silu Che, Xiaokun Chen, Mengqi Xia

Pile groups frequently subjected to extreme wave loading are crucial for the structural integrity of marine infrastructure. However, research on the pressure distribution and wave forces of pile groups under extreme wave conditions has not been explored in depth. This paper investigates the pressure distribution and wave forces on pile groups under laboratory-generated extreme waves, considering nine wave scenarios and three pile group configurations. Investigations were conducted on the integration of pressure along the circumferential direction (IPC), the peak value of wave forces (F_xm), and the ratio of the F_xm of pile groups to the F_xm of a single pile (R_c). Experimental results indicate that: In both the vertical and circumferential pressure distributions, pile groups with different configurations exhibit the same distribution characteristics as a single pile. Pressure, IPC, and F_xm are positively correlated with wave paddle velocity. Pressure generally increases with water depth, and the circumferential pressure distribution follows Bernoulli's principle. The analysis of the vertical pressure distribution reveal that the mechanisms governing the variation of static and dynamic pressure are different at above-water and underwater measuring points. The R_c values of side-by-side configuration are greater than 1 under most scenarios, whereas for tandem and 2 × 2 configurations, the R_c values are less than 1 basically. This research offers fundamental insights into the design of marine infrastructure under extreme oceanic conditions.

{"title":"Experimental study of pressure distribution and wave forces on pile groups under extreme waves","authors":"Xi Yu, Jiajia Wang, Wanshui Han, Lili Xiao, Xin Xu, Kai Zhou, Silu Che, Xiaokun Chen, Mengqi Xia","doi":"10.1016/j.oceaneng.2025.120872","DOIUrl":"10.1016/j.oceaneng.2025.120872","url":null,"abstract":"<div><div>Pile groups frequently subjected to extreme wave loading are crucial for the structural integrity of marine infrastructure. However, research on the pressure distribution and wave forces of pile groups under extreme wave conditions has not been explored in depth. This paper investigates the pressure distribution and wave forces on pile groups under laboratory-generated extreme waves, considering nine wave scenarios and three pile group configurations. Investigations were conducted on the integration of pressure along the circumferential direction (IPC), the peak value of wave forces (<em>F</em><sub><em>xm</em></sub>), and the ratio of the <em>F</em><sub><em>xm</em></sub> of pile groups to the <em>F</em><sub><em>xm</em></sub> of a single pile (<em>R</em><sub>c</sub>). Experimental results indicate that: In both the vertical and circumferential pressure distributions, pile groups with different configurations exhibit the same distribution characteristics as a single pile. Pressure, IPC, and <em>F</em><sub><em>xm</em></sub> are positively correlated with wave paddle velocity. Pressure generally increases with water depth, and the circumferential pressure distribution follows Bernoulli's principle. The analysis of the vertical pressure distribution reveal that the mechanisms governing the variation of static and dynamic pressure are different at above-water and underwater measuring points. The <em>R</em><sub>c</sub> values of side-by-side configuration are greater than 1 under most scenarios, whereas for tandem and 2 × 2 configurations, the <em>R</em><sub>c</sub> values are less than 1 basically. This research offers fundamental insights into the design of marine infrastructure under extreme oceanic conditions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"326 ","pages":"Article 120872"},"PeriodicalIF":4.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592087","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

Hierarchical feature extraction of intrinsic modes for ship-radiated noise classification

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120878

Shu-Ya Jin , Yu Su , Chi-Yuan Ma , Ya-Xian Fan , Zhi-Yong Tao

The complexity of marine acoustic environment, including background noise interference and variability in underwater transmission paths, presents significant challenges for accurately identifying ship-radiated noise (S-RN). To enhance the adaptability and precision of S-RN recognition, we propose a novel S-RN identification system that utilizes an improved empirical mode decomposition (EMD) algorithm combined with a hierarchical intrinsic mode function (IMF) selection and feature fusion approach. This system leverages the adaptive decomposition capabilities of the improved EMD algorithm to decompose original signals into a set of IMFs. It then selects those IMFs with high discriminative power based on the characteristics of the sample data, constructing a hierarchical feature extraction framework. Entropy and energy features are extracted separately from different IMFs to capture the diversity of underwater signals. The entropy features reveal the complexity and dynamic characteristics of high-frequency IMFs, while the energy intensity reflects the amplitude information in lower-frequency modes. By comparing various feature fusion strategies, the complementary features are optimally combined to enhance the discriminatory power for S-RN classification. The generated feature set is fed into different classifiers, and the classification accuracy and computational efficiency are evaluated based on the DeepShip and ShipsEar datasets. The experimental results demonstrate that the random forest (RF) model achieves a superior balance between the performance and efficiency, displaying high classification accuracy and rapid computation, and validating the potential of this method for practical signals recognition applications.

{"title":"Hierarchical feature extraction of intrinsic modes for ship-radiated noise classification","authors":"Shu-Ya Jin , Yu Su , Chi-Yuan Ma , Ya-Xian Fan , Zhi-Yong Tao","doi":"10.1016/j.oceaneng.2025.120878","DOIUrl":"10.1016/j.oceaneng.2025.120878","url":null,"abstract":"<div><div>The complexity of marine acoustic environment, including background noise interference and variability in underwater transmission paths, presents significant challenges for accurately identifying ship-radiated noise (S-RN). To enhance the adaptability and precision of S-RN recognition, we propose a novel S-RN identification system that utilizes an improved empirical mode decomposition (EMD) algorithm combined with a hierarchical intrinsic mode function (IMF) selection and feature fusion approach. This system leverages the adaptive decomposition capabilities of the improved EMD algorithm to decompose original signals into a set of IMFs. It then selects those IMFs with high discriminative power based on the characteristics of the sample data, constructing a hierarchical feature extraction framework. Entropy and energy features are extracted separately from different IMFs to capture the diversity of underwater signals. The entropy features reveal the complexity and dynamic characteristics of high-frequency IMFs, while the energy intensity reflects the amplitude information in lower-frequency modes. By comparing various feature fusion strategies, the complementary features are optimally combined to enhance the discriminatory power for S-RN classification. The generated feature set is fed into different classifiers, and the classification accuracy and computational efficiency are evaluated based on the DeepShip and ShipsEar datasets. The experimental results demonstrate that the random forest (RF) model achieves a superior balance between the performance and efficiency, displaying high classification accuracy and rapid computation, and validating the potential of this method for practical signals recognition applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"326 ","pages":"Article 120878"},"PeriodicalIF":4.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592082","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

Dynamic path planning for multi-USV in complex ocean environments with limited perception via proximal policy optimization

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120907

Xizhe Chen, Shihong Yin, Yujing Li, Zhengrong Xiang

This paper addresses the path planning problem for unmanned surface vehicles (USVs) under distributed control in dynamic maritime environments. A novel proximal policy optimization (PPO)-based algorithm is proposed to overcome the challenges posed by limited sensing capabilities and environmental variability. By integrating the reciprocal velocity obstacle method, the algorithm significantly improves obstacle avoidance efficiency while ensuring compliance with the International Regulations for Preventing Collisions at Sea (COLREGs). To address the sparse reward problem inherent in PPO algorithms, a customized reward mechanism is designed, and a bidirectional gated recurrent unit network is introduced to process variable-length observation data caused by dynamic obstacle scenarios. Extensive simulation results demonstrate that the proposed algorithm achieves notable advantages in convergence, robustness, and real-time decision-making. Furthermore, ablation and extended experiments validate the effectiveness and generalization capability of the algorithm, confirming that the multi-USV system can achieve safe, efficient, and COLREGs-compliant path planning in highly dynamic and complex environments.

{"title":"Dynamic path planning for multi-USV in complex ocean environments with limited perception via proximal policy optimization","authors":"Xizhe Chen, Shihong Yin, Yujing Li, Zhengrong Xiang","doi":"10.1016/j.oceaneng.2025.120907","DOIUrl":"10.1016/j.oceaneng.2025.120907","url":null,"abstract":"<div><div>This paper addresses the path planning problem for unmanned surface vehicles (USVs) under distributed control in dynamic maritime environments. A novel proximal policy optimization (PPO)-based algorithm is proposed to overcome the challenges posed by limited sensing capabilities and environmental variability. By integrating the reciprocal velocity obstacle method, the algorithm significantly improves obstacle avoidance efficiency while ensuring compliance with the International Regulations for Preventing Collisions at Sea (COLREGs). To address the sparse reward problem inherent in PPO algorithms, a customized reward mechanism is designed, and a bidirectional gated recurrent unit network is introduced to process variable-length observation data caused by dynamic obstacle scenarios. Extensive simulation results demonstrate that the proposed algorithm achieves notable advantages in convergence, robustness, and real-time decision-making. Furthermore, ablation and extended experiments validate the effectiveness and generalization capability of the algorithm, confirming that the multi-USV system can achieve safe, efficient, and COLREGs-compliant path planning in highly dynamic and complex environments.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"326 ","pages":"Article 120907"},"PeriodicalIF":4.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigation for shielding effects of two vessels in side-by-side configurations

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120766

Wei Wang , Dahui Ge , Guo Wang , Junbo Ge , Yihan Zhao , Aichun Feng

This study systematically investigates the shielding phenomenon that the weather-side vessel imposed on and lee-side vessel when the two vessels are positioned in side-by-side configurations. Shielding efficiency parameter is newly introduced to measure the shielding effects of three key parameters: horizontal distance, vertical distance, and wave angle. Two new concept, Theoretical wave amplitude (TWA) and Effective wave amplitude (EWA), are introduced to elucidate the physical mechanism of the shielding effect. The analysis includes a range of scenarios to study the effects of each parameter on roll, sway, and heave motions. The weather-side vessel with both free and fixed conditions is comparatively investigated to analyze the effects of vessel boundary condition on the shielding effect. Numerical results demonstrate that the three parameters significantly impact the shielding effects and the role of each parameter varies for different motion responses. The shielding effect is more pronounced for fixed condition than free case.

引用次数: 0

Joint optimization of ship traffic organization and berth allocation in a seaport with one-way channel

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120843

Fuquan Xu , Hongxiang Ren , Yating Duan , Ye Li , Tianhui Zhu

Numerous seaports operate with one-way navigation channels, requiring ships to queue for both entry and exit, which frequently results in substantial delays. With increasing volume of arriving vessels, the waiting times for dispatch rise significantly, especially in multi-harbor basins with intricate traffic conditions. To address this challenge, this study introduces a mixed-integer linear programming model for the integrated optimization of ship traffic organization and berth allocation in ports with one-way navigation channels and multi-harbor basins. The objective of this model is to minimize the weighted sum of the waiting times for all vessels. A hybrid genetic algorithm (HGA) is developed to solve the model efficiently within a reasonable time frame. Computational experiments conducted for a northern Chinese seaport demonstrate that: (i) the proposed HGA outperforms both the CPLEX solver and several heuristic algorithms, solving all problem instances within 1 min; and (ii) the joint scheduling model reduces waiting times by 32.18% compared with the traditional first-come-first-served rule. This research offers practical insights for port managers, aiming to enhance ship scheduling, reduce waiting times, and to improve the overall service quality of seaports.

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引用次数: 0

Fuzzy second-order integral terminal adaptive sliding mode control for marine cable-driven parallel grinding robot

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120784

Shilong Zhao , Shenghai Wang , Jian Li , Guangdong Han , Yunpeng He , Haiquan Chen , Weirong Luo , Yuqing Sun

During shipbuilding and maintenance, manual grinding is not only inefficient and highly risky in high-altitude operations, but also poses a threat to workers' lives due to the inhalation of metal dust. Consequently, this paper proposes a marine cable-driven parallel grinding robot (CDPGR). Firstly, a dynamic model of the CDPGR, incorporating ship motion, is established using the Lagrange method. The cable tensions are applied in the ADAMS virtual prototype to obtain the friction force and torque. Secondly, the CDPGR is highly sensitive to counter forces from the grinding mechanism, ship motion, impact loads, and other factors. Due to the insufficient control accuracy of existing controllers, a fuzzy second-order integral terminal adaptive sliding mode control (F-SOITASMC) is proposed based on the dynamic model. The stability of the control system is demonstrated using the Lyapunov theory. Furthermore, the effectiveness of the F-SOITASMC is validated through simulations under complex working conditions and compared with existing control strategies. Finally, the superiority of the F-SOITASMC is further confirmed via scaled-down prototype experiments. This study provides novel insights and methodologies for applying cable-driven parallel robots in marine environments.

{"title":"Fuzzy second-order integral terminal adaptive sliding mode control for marine cable-driven parallel grinding robot","authors":"Shilong Zhao , Shenghai Wang , Jian Li , Guangdong Han , Yunpeng He , Haiquan Chen , Weirong Luo , Yuqing Sun","doi":"10.1016/j.oceaneng.2025.120784","DOIUrl":"10.1016/j.oceaneng.2025.120784","url":null,"abstract":"<div><div>During shipbuilding and maintenance, manual grinding is not only inefficient and highly risky in high-altitude operations, but also poses a threat to workers' lives due to the inhalation of metal dust. Consequently, this paper proposes a marine cable-driven parallel grinding robot (CDPGR). Firstly, a dynamic model of the CDPGR, incorporating ship motion, is established using the Lagrange method. The cable tensions are applied in the ADAMS virtual prototype to obtain the friction force and torque. Secondly, the CDPGR is highly sensitive to counter forces from the grinding mechanism, ship motion, impact loads, and other factors. Due to the insufficient control accuracy of existing controllers, a fuzzy second-order integral terminal adaptive sliding mode control (F-SOITASMC) is proposed based on the dynamic model. The stability of the control system is demonstrated using the Lyapunov theory. Furthermore, the effectiveness of the F-SOITASMC is validated through simulations under complex working conditions and compared with existing control strategies. Finally, the superiority of the F-SOITASMC is further confirmed via scaled-down prototype experiments. This study provides novel insights and methodologies for applying cable-driven parallel robots in marine environments.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"326 ","pages":"Article 120784"},"PeriodicalIF":4.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592703","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

Performance evaluation of roll motion in offshore green hydrogen floating production storage and offloading (H2FPSO) with internal flow in liquid-hydrogen storage tanks

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120880

Byeongwon Park , Jae-Sang Jung , Yong-Guk Lee , Jong-Chun Park

This study investigated the design and motion characteristics of a floating offshore green hydrogen floating production and storage platform (H2FPSO) that uses offshore wind energy to produce, liquefy, store, and transport green hydrogen. The focus was on the influence of the internal flow within Type-C liquid-hydrogen (LH₂) storage tanks on the roll motion of the platform. This study examined the impact of different tank filling ratios through numerical simulations and physical model tests conducted in the Deep Ocean Engineering Basin (DOEB) of the Korea Research Institute of Ships & Ocean Engineering (KRISO). Two storage tank models, with capacities of 2,000 and 3,000 m³, were analyzed under both static and dynamic fluid motion scenarios. The interaction between the internal fluid dynamics and roll motion was assessed using free-decay tests and high-speed imaging. The results revealed a notable coupling effect when the natural period of the internal flow coincided with the platform's natural roll period, particularly in the 3,000 m³ tank. Moreover, as the roll amplitudes increased, the damping coefficient decreased owing to the phase discrepancies between the internal flow and platform motion. While the 2000 m³ tank exhibited minimal coupling effects, the 3,000 m³ tank exhibited substantial coupling under specific filling conditions.

{"title":"Performance evaluation of roll motion in offshore green hydrogen floating production storage and offloading (H2FPSO) with internal flow in liquid-hydrogen storage tanks","authors":"Byeongwon Park , Jae-Sang Jung , Yong-Guk Lee , Jong-Chun Park","doi":"10.1016/j.oceaneng.2025.120880","DOIUrl":"10.1016/j.oceaneng.2025.120880","url":null,"abstract":"<div><div>This study investigated the design and motion characteristics of a floating offshore green hydrogen floating production and storage platform (H2FPSO) that uses offshore wind energy to produce, liquefy, store, and transport green hydrogen. The focus was on the influence of the internal flow within Type-C liquid-hydrogen (LH<sub>2</sub>) storage tanks on the roll motion of the platform. This study examined the impact of different tank filling ratios through numerical simulations and physical model tests conducted in the Deep Ocean Engineering Basin (DOEB) of the Korea Research Institute of Ships & Ocean Engineering (KRISO). Two storage tank models, with capacities of 2,000 and 3,000 m<sup>3</sup>, were analyzed under both static and dynamic fluid motion scenarios. The interaction between the internal fluid dynamics and roll motion was assessed using free-decay tests and high-speed imaging. The results revealed a notable coupling effect when the natural period of the internal flow coincided with the platform's natural roll period, particularly in the 3,000 m<sup>3</sup> tank. Moreover, as the roll amplitudes increased, the damping coefficient decreased owing to the phase discrepancies between the internal flow and platform motion. While the 2000 m<sup>3</sup> tank exhibited minimal coupling effects, the 3,000 m<sup>3</sup> tank exhibited substantial coupling under specific filling conditions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"326 ","pages":"Article 120880"},"PeriodicalIF":4.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592086","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

Ship hydroelasticity responses in long-crested irregular waves by CFD-FEM simulation in comparison with segmented model experiment

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120886

Jialong Jiao , Zhenwei Chen , Shuai Chen , Caixia Jiang , Hailong Si

In this paper the CFD-FEM two-way fluid-structure coupled method is extended to simulate ship motions and wave load responses in long-crested irregular waves, and the results are comprehensively compared with segmented model tank experiment results. First, a numerical wave tank and a segmented ship model are established in CFD and FEM solvers. The numerical simulation scheme for ship responses in irregular waves by using high-performance computing platform is presented for high efficiency numerical computations. Then the irregular waves generated in the CFD solvers are compared with experimental and theoretical results. Furthermore, the CFD-FEM simulation results of ship motion and vertical bending moment in irregular waves are comprehensively discussed and also compared with the segmented model experiment results. The analysis includes time series, frequency spectra, statistical results, and probability distribution. The analysis reveals that the present CFD-FEM method can well simulate ship motions and loads in good accuracy and takes more advantages in cost and time-consumed compared with segmented model experiment.

{"title":"Ship hydroelasticity responses in long-crested irregular waves by CFD-FEM simulation in comparison with segmented model experiment","authors":"Jialong Jiao , Zhenwei Chen , Shuai Chen , Caixia Jiang , Hailong Si","doi":"10.1016/j.oceaneng.2025.120886","DOIUrl":"10.1016/j.oceaneng.2025.120886","url":null,"abstract":"<div><div>In this paper the CFD-FEM two-way fluid-structure coupled method is extended to simulate ship motions and wave load responses in long-crested irregular waves, and the results are comprehensively compared with segmented model tank experiment results. First, a numerical wave tank and a segmented ship model are established in CFD and FEM solvers. The numerical simulation scheme for ship responses in irregular waves by using high-performance computing platform is presented for high efficiency numerical computations. Then the irregular waves generated in the CFD solvers are compared with experimental and theoretical results. Furthermore, the CFD-FEM simulation results of ship motion and vertical bending moment in irregular waves are comprehensively discussed and also compared with the segmented model experiment results. The analysis includes time series, frequency spectra, statistical results, and probability distribution. The analysis reveals that the present CFD-FEM method can well simulate ship motions and loads in good accuracy and takes more advantages in cost and time-consumed compared with segmented model experiment.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"326 ","pages":"Article 120886"},"PeriodicalIF":4.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592088","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

Dynamics modeling of wind turbine blade-tower coupled system based on multibody system transfer matrix method and vibration suppression

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120821

Dongyang Chen , Xinsheng Zhang , Genjin Dong , Yang Luo , Guang Pan

As a typical thin-walled column structure, wind turbines are susceptible to strong wind, resulting in fluid-structure coupled vibration. For multi-rigid-flexible body systems represented by wind turbines, predicting vibration characteristics accurately and quickly is of great significance. This paper establishes the dynamic model of the wind turbine blade-tower coupled system based on the Multibody System Transfer Matrix Method (MSTMM). The accuracy of the model is verified through comparison with references. On this basis, the Nonlinear Energy Sink (NES) is added to the model to establish the dynamic model of the tower of the wind turbine with NES. By combining the wind load model to simulate the wake motion of the structure, the suppression of vortex-induced vibration of the structure with NES is conducted. The results show that for vortex-induced vibration of three-dimension cylinder structures at high Reynolds numbers, NES has better vibration suppression effects compared to TMD. Within a certain range, the higher the mass ratio, damping ratio, and stiffness ratio of NES, the more significant the vibration suppression effect. When the NES mass ratio is 3%, the damping ratio is 5%, the suppression effect of wind turbine is best. The higher the tower, the more obvious the effect, up to 20%. The stiffness ratio has little influence. The process of establishing the dynamic model of wind turbines proposed based on MSTMM is simple, only requiring the assembly of the transfer matrices of each element, while also having the advantages of high computational accuracy and speed. It can provide reference for the dynamic modeling of multi-rigid-flexible body systems and rotating machinery systems.

{"title":"Dynamics modeling of wind turbine blade-tower coupled system based on multibody system transfer matrix method and vibration suppression","authors":"Dongyang Chen , Xinsheng Zhang , Genjin Dong , Yang Luo , Guang Pan","doi":"10.1016/j.oceaneng.2025.120821","DOIUrl":"10.1016/j.oceaneng.2025.120821","url":null,"abstract":"<div><div>As a typical thin-walled column structure, wind turbines are susceptible to strong wind, resulting in fluid-structure coupled vibration. For multi-rigid-flexible body systems represented by wind turbines, predicting vibration characteristics accurately and quickly is of great significance. This paper establishes the dynamic model of the wind turbine blade-tower coupled system based on the Multibody System Transfer Matrix Method (MSTMM). The accuracy of the model is verified through comparison with references. On this basis, the Nonlinear Energy Sink (NES) is added to the model to establish the dynamic model of the tower of the wind turbine with NES. By combining the wind load model to simulate the wake motion of the structure, the suppression of vortex-induced vibration of the structure with NES is conducted. The results show that for vortex-induced vibration of three-dimension cylinder structures at high Reynolds numbers, NES has better vibration suppression effects compared to TMD. Within a certain range, the higher the mass ratio, damping ratio, and stiffness ratio of NES, the more significant the vibration suppression effect. When the NES mass ratio is 3%, the damping ratio is 5%, the suppression effect of wind turbine is best. The higher the tower, the more obvious the effect, up to 20%. The stiffness ratio has little influence. The process of establishing the dynamic model of wind turbines proposed based on MSTMM is simple, only requiring the assembly of the transfer matrices of each element, while also having the advantages of high computational accuracy and speed. It can provide reference for the dynamic modeling of multi-rigid-flexible body systems and rotating machinery systems.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"326 ","pages":"Article 120821"},"PeriodicalIF":4.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592551","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

Kinematic response of flexible suction caissons for offshore wind turbines to vertically incident shear waves

IF 4.6 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2025-03-11 DOI: 10.1016/j.oceaneng.2025.120750

Jacob D.R. Bordón, Cristina Medina, Juan C. Galván, Luis A. Padrón

This paper presents the translational and rotational kinematic interaction factors of flexible suction caissons considering structural and soil properties relevant to the seismic analysis of offshore wind turbines. Kinematic stresses developed along the foundation skirt are also presented and analyzed. The parametric analysis performed considers four height–to–diameter ratios between 0.5 and 2, three skirt thickness–to–diameter ratios between 0.5 % and 2.0 %, and four different relevant skirt–soil stiffness ratios for sand soils. The foundations are assummed to be founded in homogenous and non-homogeneous soils, and they are considered to be subjected to vertically–incident shear waves. The kinematic response of the foundations is computed through an advanced boundary element – finite element coupled numerical model. It is found that the kinematic interaction factors are fundamentally independent of the skirt–soil stiffness ratio. It is also found that the general pattern of the kinematic interaction factors is analogous to that of piles, and that significant filtering of the seismic input motions can be observed. Results are presented in ready–to–use dimensionless plots. Regarding kinematic stresses, shell-like or beam-like behaviour is observed depending on height–to–diameter ratio of the skirt.

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全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

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