Article
Engineering, Marine
Zhipeng Shen, Xuechun Fan, Liangyu Zhang, Haomiao Yu
Summary: This study proposes a novel hybrid neural network scheme based on convolutional neural network (CNN) and long short-term memory (LSTM) for multi-step wind speed prediction. Experimental results show that the proposed scheme outperforms other benchmark models in terms of accuracy and stability.
Review
Engineering, Marine
Ulku Ozturk, Melih Akdag, Tarik Ayabakan
Summary: This review explores the path planning algorithms of autonomous maritime vehicles and highlights the need to address various traffic rules, as well as the calibratability of algorithms after regulation amendments.
Article
Engineering, Marine
Hasan Ugurlu, Ismail Cicek
Summary: Our research study shows that the expected decrease in maritime accidents over the past few decades has not occurred. Collisions and contact incidents have consistently been the most frequent types of accidents. Violation of COLREG rules was found to be the most significant factor contributing to collision accidents, with maneuvering and perception errors also playing a vital role. In fact, 94.7% of collision accidents were found to be related to human error.
Review
Engineering, Marine
Zeinab Elmi, Prashant Singh, Vamshi Krishna Meriga, Krzysztof Goniewicz, Marta Borowska-Stefanska, Szymon Wisniewski, Maxim A. Dulebenets
Summary: Each shipping line needs to establish a reliable operating model and the design of ship schedules plays a crucial role in long-term profits. Managing the time factor is critical in the current liner service design as shipping schedules are prone to disruptions. This article provides a comprehensive review on uncertainties in liner shipping operations and ship schedule recovery strategies, offering mathematical models for future research.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Lu Liu, Lichuan Zhang, Guang Pan, Shuo Zhang
Summary: Autonomous underwater vehicles (AUVs) have significant research attention in marine science and technology due to their wide applications and ability to replace humans in dangerous operations. In this study, a robust fractional-order proportional-integral-derivative (FOPID) controller design for an AUV yaw control system is proposed. The simulation results demonstrate the superior robustness and transient performance of the proposed control algorithm.
Article
Engineering, Marine
Yu Zhang, Wei Shi, Dongsheng Li, Xin Li, Yuanfeng Duan, Amrit Shankar Verma
Summary: This paper proposes a novel framework for modeling floating offshore wind turbines (FOWTs) based on the vector form intrinsic finite element (VFIFE) method. The framework includes multi-body dynamics for rigid body motion, VFIFE for structural deformation analysis and governing equation solution. It also considers a dynamic and flexible mooring system model, and verifies and compares the results.
Article
Engineering, Ocean
Qian Sun, Zhong Tang, Jingpeng Gao, Guochang Zhang
Summary: The study introduces a new hybrid prediction model of ship motion attitude based on LSTM and GPR, combining the advantages of both models to achieve high-accuracy point prediction results and reliable interval prediction results simultaneously.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Marine
Min Tang, Bin Ji, Xiaoping Fang, Samson S. Yu
Summary: This study established a mixed-integer linear programming model for the continuous berth allocation and quay crane assignment problem and proposed a large neighborhood search algorithm and discretization strategy to improve the efficiency of solving the problem. Numerical results showed that the algorithm can effectively optimize solutions for small-scale instances.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Yangping Lu, Lei Tan, Yadong Han, Ming Liu
Summary: Cavitation and vibration are important characteristics in pumps, and there is a strong correlation between the two. A synchronous experimental system was built to measure cavitation and vibration in pumps under different rotational speed accelerations. Results show that high-amplitude vibrations occur after cavitation, and a new criterion method is proposed to judge cavitation occurrence.
Article
Engineering, Ocean
Zhibo He, Chenguang Liu, Xiumin Chu, Rudy R. Negenborn, Qing Wu
Summary: This article proposes a dynamic collision avoidance path planning algorithm based on the A-star algorithm and ship navigation rules, which can solve the path planning problem with dynamic obstacles in multi-ship encounter scenarios and strike a balance between navigation risk and economical efficiency.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Civil
Y. Pan, S. Yin, Y. P. Chen, Y. B. Yang, C. Y. Xu, Z. S. Xu
Summary: Reduced-scale mobile-bed flume tests were conducted to study the evolution of a submerged berm under low-energy conditions. The results showed that wave height had a significant impact on the evolution patterns of the submerged berm, and velocity skewness, wave height, and local water depth were the major factors affecting onshore sediment transport.
COASTAL ENGINEERING
(2022)
Article
Engineering, Marine
Brian Murray, Lokukaluge Prasad Perera
Summary: This study presents a method that uses historical AIS data to predict the future trajectory of a selected vessel. By evaluating historical ship behavior and applying machine learning techniques, the method predicts behavior modes and trajectories for the selected vessel. The approach clusters relevant trajectory segments to extract better historical ship behavior modes and utilizes enhanced data for trajectory predictions.
JOURNAL OF OCEAN ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Marine
Aliyu Abdullahi, Subhamoy Bhattacharya, Chao Li, Yiqing Xiao, Ying Wang
Summary: The study focuses on the behavioural patterns of offshore wind turbines, particularly large ones supported on monopiles, to prevent negative impacts on their serviceability arising from modal property and foundation tilt changes. Data collected over 10 years is used to analyze load cases and estimating forces and moments acting on a prototype 10 MW OWT, revealing the potential underestimation of natural frequencies and tilt by fixed amplitude cyclic loads. By conducting long term model tests, the study aims to bridge the gap in understanding and predicting OWT behaviors.
Article
Engineering, Marine
Meiyan Zou, Mingsheng Chen, Ling Zhu, Lin Li, Wenhua Zhao
Summary: This study presents a Constant Parameter Time Domain Model (CPTDM) that combines the damping lid method and state-space model to evaluate the wave-induced dynamics of floating structures. The study finds that a larger damping lid factor helps to decrease the amplitude of the impulse response functions, and the developed model performs well for different wave frequencies and headings.
Article
Engineering, Marine
Lanre Akinyemi, Mehmet Senol, M. S. Osman
Summary: The generalized Riccati equation mapping method (GREMM) is used to obtain various soliton solutions for the nonlinear Schrödinger equation with higher dimension in the regime of anomalous dispersion. The q-homotopy analysis method combined with the Laplace transform (q-HATM) is employed to obtain approximate solutions for bright and dark optical solitons, which are represented as rapidly convergent series. The proposed techniques are demonstrated to be useful, efficient, and reliable mathematical methods for extracting soliton solutions.
JOURNAL OF OCEAN ENGINEERING AND SCIENCE
(2022)
Review
Engineering, Marine
Nerea Portillo Juan, Vicente Negro Valdecantos
Summary: This article reviews the application of Artificial Neural Networks (ANNs) in ocean and maritime engineering, covering its origins and current state. After analyzing over 90 studies, the article presents general rules and common methods for applying ANNs in ocean engineering, as well as identifying gaps in research.
Article
Engineering, Marine
Jieyan Chen, Moo-Hyun Kim
Summary: As international efforts to address climate change grow, many countries and companies have set clear net zero goals by accelerating renewable energy development. Offshore wind energy, as a renewable energy source, has attracted attention and is an active research area. However, the design of offshore wind turbine structures faces challenges, requiring advanced optimization technology to address them.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Rong Zhen, Ziqiang Shi, Jialun Liu, Zheping Shao
Summary: This paper proposes a novel method for assessing regional ship collision risk in complex waters by combining density clustering and multiple influence factors. The method accurately quantifies ship collision risk and effectively identifies high-risk ships.
Article
Engineering, Marine
Zhenzhou Zhao, Ruifang Jiang, Junxin Feng, Huiwen Liu, Tongguang Wang, Wenzhong Shen, Ming Chen, Dingding Wang, Yige Liu
Summary: This paper provides a comprehensive review of state-of-the-art vortex generators (VGs) tested in the wind turbine field. It illustrates the basic principle of VG-related flow control and discusses the effects of VGs on wind turbine blades. The paper also proposes future research directions and discusses aerodynamic factors impacting VG behavior.
Article
Engineering, Ocean
Wei Shi, Lixian Zhang, Madjid Karimirad, Constantine Michailides, Zhiyu Jiang, Xin Li
Summary: In this paper, fully coupled time-domain analysis is conducted to investigate the impact of second-order wave hydrodynamic loads combined with aerodynamic loads on the dynamic responses of three different semisubmersible floating offshore wind turbines (semi-FOWTs) under normal and extreme sea conditions. The simulation results show that the second-order hydrodynamic loads play a significant role in the motion and structural responses under extreme sea conditions, while the aerodynamic loads greatly affect the dynamic responses under normal operational conditions. The findings also suggest that water depth has a larger impact on the motion and force responses of the semi-FOWTs under extreme sea conditions.
APPLIED OCEAN RESEARCH
(2023)
