Article
Engineering, Marine
Yajun Ren, Vengatesan Venugopal, Wei Shi
Summary: This paper presents the design and dynamic analysis of a multi-column tension leg platform floating offshore wind turbine with broken tendons. The study examines the impact of tendon failure on the system performance, demonstrating the turbine's stability under various environmental conditions.
Article
Engineering, Marine
Wenbing Wu, Zijian Yang, Xin Liu, Yunpeng Zhang, Hao Liu, M. Hesham El Naggar, Meijuan Xu, Guoxiong Mei
Summary: This paper investigates the horizontal dynamic response of a pile embedded in unsaturated soil considering the effect of construction disturbance. Analytical solutions are derived using the Laplace transform and transfer matrix method. Parametric study reveals that the horizontal dynamic response of the pile head is significantly influenced by the range and degree of construction disturbance.
Article
Engineering, Marine
He Li, Cheng-Geng Huang, C. Guedes Soares
Summary: This paper proposes an FMEA-BN model for determining the inspection and opportunistic maintenance strategies of floating offshore wind turbines. The model utilizes a mapping algorithm to establish a mirrored Bayesian Network (BN) model based on failure mode and effect analysis (FMEA) structure, allowing for efficient consideration of common cause failures. By updating the failure probabilities of components using the BN sub-model, and utilizing the FMEA sub-model, this model suggests inspection and maintenance strategies for floating offshore wind turbines under various operation scenarios. The validation of the results demonstrates the effectiveness of the model in supporting real-time inspection and maintenance strategies determination for complex systems like floating offshore wind turbines.
Article
Engineering, Civil
Weidong Zhang, Yudong Wang, Chongyi Li
Summary: This article proposes a method to address the quality degradation issues in underwater images through attenuated color channel correction and detail preserved contrast enhancement. Experimental results demonstrate the effectiveness of the method in enhancing underwater images, as well as low-light images and hazy images.
IEEE JOURNAL OF OCEANIC ENGINEERING
(2022)
Article
Engineering, Marine
Yapo Wang, Wei Shi, Constantine Michailides, Ling Wan, Hyungoo Kim, Xin Li
Summary: In this study, a combined concept consisting of a floating offshore wind turbine and a wave energy converter is proposed and investigated. Different shapes of the wave energy converter were compared in terms of hydrodynamic performance and dynamic responses. It was found that the use of a concave-shaped wave energy converter resulted in better dynamic responses.
Article
Engineering, Marine
Bing Bai, Rui Zhou, Guangchang Yang, Weilie Zou, Wei Yuan
Summary: A multiphase constitutive model of hydrate-bearing sediment is established within a granular thermodynamic framework, considering the energy dissipation caused by hydrate dissociation and granular rearrangement at the micro level. This model captures the complex behavior of the sediment by incorporating the nonlinear expression of bonding stress, considering the relative velocities of the gas and liquid phases, and introducing the coupling effect of heat conduction.
Article
Engineering, Marine
T. Sadeghifar, G. F. C. Lama, P. Sihag, A. Bayram, O. Kisi
Summary: This study investigated the performance of different soft-computing approaches in predicting wave heights. The results showed that the M5P model outperformed other models and is suitable for estimating wave heights in the Persian Gulf area.
Article
Engineering, Marine
Ning Fan, Jianxiong Jiang, Youkou Dong, Lin Guo, Laifu Song
Summary: This study focuses on the instantaneous impact process of submarine slides on pipelines and evaluates its effect using numerical simulations. It provides an approach to evaluate the instantaneous impact forces and verifies its effectiveness.
Article
Engineering, Marine
Mohammad Heidarzadeh, Aditya Riadi Gusman, Takeo Ishibe, Ramtin Sabeti, Jadranka Sepic
Summary: The 15 January 2022 Tonga volcanic tsunami was a unique event where waves were created by a dual-mechanism generation process involving atmospheric pressure waves and eruption-induced water displacements. The study found that the maximum overall coastal tide gauge amplitudes ranged from 4.2 to 148.8 cm, while DARTs recorded maximum amplitudes of 3.6 to 21.4 cm.
Article
Engineering, Ocean
Xiaoniu Yu, Hui Rong
Summary: Research has shown that the use of seawater-based microbial-induced carbonate precipitation technology can be applied in the construction of ocean islands and reefs. Different pH values of seawater-based UPB can induce calcium carbonate deposition at different times, with the strength and carbonate content of sand blocks cemented using the two-phase method being greater than that of the one-phase method.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Marine
Fei Lei, Feifei Tang, Shuhan Li
Summary: This paper applies the advanced YOLOv5 algorithm to underwater target detection and improves it by combining with methods suitable for the underwater environment. The improved network model achieves impressive results in detecting underwater targets.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Kai Hu, Chenghang Weng, Yanwen Zhang, Junlan Jin, Qingfeng Xia
Summary: This paper focuses on the importance of underwater video images in human exploration and development of the ocean, analyzes the imaging principle and quality issues of underwater images, and introduces existing enhancement methods and technologies. It also presents standard underwater datasets and evaluation indexes, and discusses possible future developments in this area.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Md Rezwan Ahamed Fahim, Purobi Rani Kundu, Md Ekramul Islam, M. Ali Akbar, M. S. Osman
Summary: The (3+ 1)-dimensional Kadomtsev-Petviashvili and the modified KdV-Zakharov-Kuznetsov equations have significant impact in modern science, and this article analyzes their effects on wave contours and extracts different standard wave configurations. Wave solutions are obtained using the sine-Gordon expansion method, and the efficiency of this approach in solving high-dimensional nonlinear evolution equations is established. The study provides closed-form solutions and discusses them through diagrams.
JOURNAL OF OCEAN ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Marine
Yuan Fang, Zhenwei Huang, Jinyun Pu, Jinsong Zhang
Summary: This study successfully applies deep reinforcement learning to achieve posture control of under-actuated and X-rudder AUV, demonstrating significant performance in position-tracking and trajectory control tasks.
Article
Engineering, Marine
Xingsen Guo, Thorsten Stoesser, Tingkai Nian, Yonggang Jia, Xiaolei Liu
Summary: This paper investigates the influence of pipeline surface roughness on the interaction between submarine landslides and pipelines. The study establishes a methodology to estimate peak impact forces, providing a basis for risk assessment of submarine pipelines.
Article
Engineering, Marine
Guangnian Xiao, Tian Wang, Xinqiang Chen, Lizhen Zhou
Summary: The role of the shipping industry in international logistics has become increasingly important, but it has also brought about environmental problems. This study analyzed the ship pollutant emissions in the ports of Los Angeles and Long Beach based on data from 2020, and found that there is a significant difference in emissions based on ship types and sailing states. Additionally, the effectiveness of ECA policies in controlling pollutant emissions varies.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Bin Du, Bin Lin, Chenming Zhang, Botao Dong, Weidong Zhang
Summary: This paper presents a safe learning scheme for the USV interception mission using a safe Lyapunov boundary deep deterministic policy gradient algorithm. By applying a single neuron proportional adaptive control for pre-training, the proposed method quickly converges to feasible solutions subject to safety constraints and demonstrates high performance in stability and safety.
Review
Engineering, Marine
Ailong Fan, Jian Yang, Liu Yang, Da Wu, Nikola Vladimir
Summary: This study conducted a literature review on ship fuel consumption (SFC) models using the bibliometric tool CiteSpace, analyzing the different types of SFC models, their advantages and disadvantages, influencing factors, and suitable applications. Improvement suggestions and future research directions were proposed.
Article
Engineering, Marine
H. Diaz, A. P. Teixeira, C. Guedes Soares
Summary: A Monte Carlo simulation procedure is developed to select the optimum location of wind farms by combining major decision criteria and subjective judgments from decision-makers. The method utilizes Monte Carlo simulation, conventional Analytic Hierarchy Process, and Fuzzy Analytic Hierarchy Process. It is applied to offshore wind farms in Spain to rank the most suitable turbine positioning locations.
Article
Engineering, Marine
Jun-Hwa Kim, Namho Kim, Yong Woon Park, Chee Sun Won
Summary: SMD-Plus is an improved version of SMD dataset with corrected annotations and addresses the issues of noisy labels and imprecisely located bounding boxes. It utilizes an online transformation technique called Copy & Paste to solve the class-imbalance problem in the training dataset and applies mix-up technique for augmentation in YOLO-V5 model. Experimental results show improved detection and classification performance of modified YOLO-V5 using SMD-Plus.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
