Article
Engineering, Marine
Atefeh Neisi, Hassan Ghassemi, Mehdi Iranmanesh
Summary: Investigating mooring line failure is crucial for ensuring safety in floating wind turbine platform operations. This study evaluates the performance of two mooring systems (OC4-DeepCwind and MSM-BMW) in intact and failure scenarios, and finds that the MSM-BMW system performs better.
Article
Engineering, Marine
Zhou Huang, Xinfeng Yin, Yang Liu, Shenghua Tang
Summary: A novel bridge scour detection method is proposed in this study, using a bridge-vehicle-wave interaction model and a Siamese neural network to capture the structural changes of real bridges caused by scour damage. Field test results show the effectiveness of the method.
Article
Engineering, Marine
Jie-feng Liu, Sa Li, Zhen-yi Shen, Shun-tao Fan
Summary: Investigation into the strain-softening behavior of clay is crucial for offshore geotechnical engineering. This study proposes an exponential strength degradation model and verifies its accuracy by comparing it with other models. The effectiveness of the model is confirmed through a finite element analysis of pipe-clay interaction. Accurately evaluating the degradation of undrained shear strength of clay is essential.
Article
Engineering, Marine
Lin Ma, Ping Yang, Diju Gao, Chunteng Bao
Summary: This study proposes a multi-objective optimization model of ship energy efficiency based on the multi-objective particle swarm optimization algorithm. The model optimizes the main engine speed to reduce fuel consumption and sailing time. The impact of different sea conditions on sailing state is taken into account, and corresponding optimization solutions are provided. The results show that the proposed solutions effectively reduce fuel consumption and sailing time.
Article
Engineering, Marine
Aolin Gu, Weihong Peng, Zefeng Li, Chenhua Hu, Shuo Yang, Qiqi Zhang
Summary: This paper explores the weakening effect of different spoiler components on vortex-induced vibration (VIV) through numerical simulations. A novel concept of a semi-ring diversion type component is proposed for further optimization. The results show that traditional spoiler components have inherent shortcomings in weakening efficiency, while the diversion component effectively reduces the resonance frequency and vibration amplitude of VIV.
Article
Engineering, Marine
Shi Liu, Yi Yang, Xinran Guo, Yu Zhou, Dezhi Ning
Summary: This paper investigates the hydrodynamic properties of an offshore stationary platform with triple oscillating water column wave energy converters. It is found that there is a phase lag between the surface elevation and the air pressure measured in the chamber of the water columns. The wave energy capturing capability of the seaward water column is significantly improved when the incident wave approaches the platform with certain angles. The average efficiency of the three water columns at the resonant frequency is enhanced when the device spacing is four times larger than the diameter of the water columns.
Article
Engineering, Marine
Yexuan Ma, Zhiyou Song, Jingyu Xu, Wanhai Xu
Summary: This research presents a laboratorial study on flow-induced vibration exhibited by four flexible cylinders positioned within a square geometric arrangement. The study provides insights into the FIV features through analyzing the vibration modes, frequencies, amplitudes, and motion trajectories.
Article
Engineering, Marine
Kemeng Xi, Ian A. Milne, Scott Draper, Lifen Chen
Summary: The application of computational fluid dynamics and overset meshing is important for predicting the roll response of ships. This study demonstrates that these methods can effectively model complex vortex flows and reliably estimate damping coefficients.
Article
Engineering, Marine
Shuai Li, Yanhui Wang, Muhua Ren, Wendong Niu, Ming Yang, Shaoqiong Yang, Xuehao Wang, Shuai Fa
Summary: This study establishes and verifies two-dimensional (2D) and three-dimensional (3D) models of an underwater glider (UG) and the target location. The 3D model shows a smaller error in station keeping against currents and enhances the travel efficiency and path tracking of UGs. The results suggest that the proposed 3D model is practical and effective.
Article
Engineering, Marine
Bradley Campbell, Vadim Belenky, Vladas Pipiras, Kenneth Weems, Themistoklis P. Sapsis
Summary: This article summarizes the development and application of the Envelope Peak-over-Threshold (EPOT) method for the roll motion of a ship in irregular waves. The method utilizes an envelope of the peaks to decluster the data, offering a statistical model with physical considerations. By studying the behavior of the shape parameter on large-volume samples using a data-driven Generalized Pareto distribution (GPD), the theoretical prediction of the tail structure is confirmed. The physics-informed statistical model approximates data above a suitable threshold with a Pareto distribution, determined by a prediction error criterion.
Article
Engineering, Marine
Freddy Alejandro Portillo Morales, Ricardo Serfaty, Joao Marcelo Vedovotto, Aldemir Cavallini Jr, Millena Martins Villar, Aristeu da Silveira Neto
Summary: This paper presents the mathematical modeling and numerical simulations of fluid-structure interaction problems using Cartesian block-structured mesh, Finite Volume Method for the fluid domain, and Immersed Boundary Method for the solid-fluid interface. The simulations focus on a pipeline system in the oil and gas industry, predicting the surface response using machine learning.
Article
Engineering, Marine
V. Piscopo, A. Scamardella
Summary: This paper focuses on the influence of wind spectrum and turbulence intensity on the design of stationkeeping systems for Floating Offshore Wind Turbines. It introduces two commonly used wind spectra and emphasizes the importance of their selection in the proper design of the system. Through numerical investigation, it is found that both the wind spectrum and turbulence model play a crucial role in optimizing the design and selecting the appropriate parameters for the system.
Article
Engineering, Marine
Mingxiao Sun, Houxin Lian, Tiantian Luan, Xiaoshuang Zhang, Baoqi Wu, Hanxu Wang
Summary: This study proposes a full speed range lift calculation method for analyzing the impact of the operating mode of the Magnus rotating roll stabilizer on anti-rolling performance. By correcting the lift model through hydrodynamic simulation analysis and using RBF neural networks, the Magnus rotating stabilizer achieves excellent anti-rolling performance in different operating modes. Simulation results show that the corrected lift model has good predictive performance, with a maximum anti-roll efficiency of over 93%.
Article
Engineering, Marine
Jorge Antonio Velasco-Parra, Fabuer R. Valencia, Alberto Lopez-Arraiza, Bladimir Ramon-Valencia, German Castillo-Lopez
Summary: This study aims to investigate the mechanical feasibility of using jute-fiber-reinforced-bioepoxy (JFRB) as a substitute for glass-fiber-reinforced-plastics (GFRP) in naval applications. Results show that JFRB exhibits reduced tensile properties after seawater immersion, but still holds potential as an environmentally friendly reinforcement material for ship hulls. Design analysis of a recreational boat hull demonstrates that the use of JFRB is mechanically feasible under certain conditions, albeit with increased material thickness.
Article
Engineering, Marine
Bin Xu, Xi Shen, Desheng Zhang, Jian Chen
Summary: This paper proposes an innovative methodology to improve hydrodynamic performance by optimizing blade shape. By using modified Blade Element Momentum (BEM) theory and particle swarm optimization algorithm, better performance of tidal current turbine can be achieved.
Article
Engineering, Civil
Adeola M. Dahunsi, Olusegun A. Dada, Frederic Bonou, Ezinvi Baloitcha
Summary: The densely populated coast of the Gulf of Guinea is experiencing escalating erosion from climate change. By analyzing past and future sediment transport, it is found that sediment transport is continuously increasing in most locations, leading to accelerated erosion.
COASTAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Gerardo Cano-Perea, Edgar Mendoza, Boris Miguel Lopez-Rebollar
Summary: This paper describes the numerical performance of a system consisting of a duct coupled to a 30 cm diameter horizontal axis water turbine. The performance of the system was assessed using two different approaches, and it was found that the ducted turbine produced 1.42 to 1.48 times more power than its bare counterpart. Additionally, several alternative advantages for exploiting ocean currents with low energetic flow conditions were identified and discussed.
JOURNAL OF OCEAN ENGINEERING AND MARINE ENERGY
(2023)
Article
Energy & Fuels
Joseph G. Wallwork, Athanasios Angeloudis, Nicolas Barral, Lucas Mackie, Stephan C. Kramer, Matthew D. Piggott
Summary: This study examines the accuracy and sensitivity of tidal array performance assessment using goal-oriented mesh adaptation. The results demonstrate that the goal-oriented methodology improves the accuracy of the discontinuous Galerkin method and enables more efficient extraction of energy compared to fixed mesh simulations.
JOURNAL OF OCEAN ENGINEERING AND MARINE ENERGY
(2023)
Article
Engineering, Civil
Shuaishuai Li, Xiang Gao, Zexiao Xie
Summary: This article presents a underwater binocular measurement system that combines binocular vision and multicolor structured light to address the issue of autonomous grasping by underwater robots. The system offers high measurement accuracy, efficiency, stability, and reliability, allowing for underwater target survey, positioning, and autonomous grasping. Experimental results demonstrate the effectiveness and accuracy of the proposed measurement model and matching algorithm.
IEEE JOURNAL OF OCEANIC ENGINEERING
(2023)
Article
Engineering, Civil
Takehiko Nose, Tomotaka Katsuno, Takuji Waseda, Shuki Ushio, Jean Rabault, Tsubasa Kodaira, Joey Voermans
Summary: A drifting wave-ice buoy (Medusa-766) was deployed in the Lutzow-Holm Bay in Antarctica to study the wave influence on the unstable fast ice. The buoy survived the Antarctic winter and detected evidence of wave signals, which were likely generated by an extratropical cyclone in the Southern Ocean. Wave-induced ice breakup potential was found to extend hundreds of kilometers into the ice field. However, during the summer months, the buoy did not detect significant wave energy, even during on-ice wave events.
COASTAL ENGINEERING JOURNAL
(2023)
