Related references
Note: Only part of the references are listed.
Article
Engineering, Marine
Haichao Chang et al.
Summary: As the number of design variables increases, hull form optimization becomes more challenging due to the curse of dimensionality. Traditional sensitivity analysis methods are time-consuming as they require extensive computational fluid dynamics (CFD) computations and analyze the effects of all variables on the output. Therefore, it is crucial to develop a rapid and effective dimensionality reduction method. The Karhunen-Loeve (K-L) transform method projects data from a high-dimensional space onto a low-dimensional space by analyzing the relationship between variables and extracting principal components that represent hull geometric characteristics. The K-L transform-based dimensionality reduction method significantly reduces optimization time while maintaining acceptable performance.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Suleyman Duman et al.
Summary: The consideration of shallow water effects becomes increasingly important for inland operations. The interaction between catamarans and the riverbed complicates the shallow water problem due to their complex interference phenomenon. Catamarans are highly sensitive to speed changes and shallow water effects, making their design more challenging than monohulls. The larger wetted surface of catamarans poses a disadvantage at lower speeds, but can turn into an advantage at higher speeds.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Thi Loan Mai et al.
Summary: This paper examines the roll-related hydrodynamic derivatives of several surface ships through pure roll tests and analyzes the flow using Computational Fluid Dynamics (CFD) simulation. The results show that the catamaran has the greatest roll moment, and the bilge keels and surface shape contribute to increasing roll damping moment. Additionally, the CFD simulation method accurately predicts the roll-related derivatives, which is challenging to achieve through experimental methods.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Lifei Song et al.
Summary: This paper proposes a PID parameter tuning and optimizing method based on deep reinforcement learning for controlling the heading of unmanned surface vessels (USVs). By establishing a dynamics model, designing guidance laws and PID controllers, and using the soft actor-critic auto method for dynamic PID parameter adjustment, the optimization of path planning and heading control system is achieved.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Jose M. Perez-Canosa et al.
Summary: This paper continues the authors' recent research on the sudden loss of stability in fishing vessels and cargo shifting in merchant fleets. Mathematical models were used to study ship rolling motion in both static and dynamic conditions, providing operators with information to improve a ship's behavior and seakeeping.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Mina Tadros et al.
Summary: This paper presents the effect of selecting a contra-rotating propeller (CRP) on a bulk carrier. The geometry of the CRP was selected using an optimization model. The research shows that the CRP outperforms the fixed pitch propeller (FPP) in terms of efficiency, cavitation, and fuel economy.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Mina Tadros et al.
Summary: This study aims to improve the energy efficiency and reduce emissions of a bulk carrier by optimizing the propeller cup design, which can effectively reduce propeller cavitation and fuel consumption.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Hafizul Islam et al.
Summary: This study investigates the aerodynamic loads on a naval patrol vessel using computational fluid dynamic simulations. The results provide reliable aerodynamic load data for developing reliable manoeuvring models, which is crucial for high-speed vessels with sophisticated superstructures.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Ganbo Zhang et al.
Summary: Propeller-induced longitudinal vibration resonance in marine propulsion shafting systems is harmful to the hull structure and a major source of shipboard noise. Integrating a friction damper with thrust bearings can effectively control the transmission of longitudinal vibration. Experimental and theoretical studies confirm the effectiveness of the damper-integrated thrust bearing in suppressing shafting vibration response.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Savas Sezen et al.
Summary: This study investigates the influence of roughness on hydrodynamic performance, especially for the hub vortex cavitation, of a benchmark propeller. The results show that the degradation effects of roughness on propeller performance are negligible, while there are favorable impacts of roughness on the hub vortex, enabling the mitigation of hub vortex cavitation.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Jeong Cheol Park et al.
Summary: This paper presents a semi-analytical method to analyze the hydrodynamics of a floating polygonal platform within a floating polygonal ring structure under wave action. The interactions inside the ring structure are studied by considering different oscillation scenarios. The formulation and code are verified against commercial software and parametric studies are performed to understand the effects of dimension changes on hydrodynamic quantities.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Sarat Chandra Mohapatra et al.
Summary: This paper formulates a mathematical model to study the interaction between solitary waves and a pontoon-type rigid floating structure, and validates and compares three different models. The results show good agreement among the models, and analyze the effects of various factors on the solitary wave profiles.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Suli Lu et al.
Summary: This article presents a case study on ship rudders to investigate the impacts of different mesh properties on the accuracy of hydrodynamic coefficients obtained by CFD methods. Recommended mesh properties, including Reynolds numbers, domain sizes, and node distributions, are provided for airfoil-shaped profiles. The study clarifies the influences of mesh properties on rudder hydrodynamics and offers applicable settings for other airfoil-shaped profiles.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Marine
Qingze Gao et al.
Summary: This study predicts wave-induced motions and steady wave forces for the oil tanker KVLCC2 in regular head and oblique waves using an expanded RANS solver based on OpenFOAM. The results show that inertial effects due to wave-induced ship motions are significant in large amplitude wave-induced motions, and the influence of wave amplitude on added resistance is analyzed. Comparisons with experimental data show good agreements between the numerical predictions and experimental results.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Marine
Luca Braidotti et al.
Summary: Research has explored using machine learning to assess damage consequences in ship flooding situations, finding that random forests are effective in evaluating the fate of ships and damaged compartments as well as estimating time-to-flood. Training random forests with precalculated flooding simulations, multiple database generation methods were tested to facilitate the development of sensor-agnostic decision support systems for flooding emergencies.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Review
Engineering, Marine
Serge Sutulo et al.
Summary: The article provides a detailed analysis of the basic principles of safety standards and manoeuvrability standards in naval architecture, discussing the possible ways to extend existing standards to accommodate adverse sea and wind conditions, and considering modification of current standards as a possible solution.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Marine
Hui Li et al.
Summary: This paper introduces an approach to determine the optimal bow of polar ships based on numerical simulations and experimental studies, considering both ice resistance and calm-water resistance with navigation time. By analyzing sensitivities to different angles, bow configurations with superior icebreaking capability are obtained. The overall resistance index proposed in this approach can be used to evaluate the integrated resistance performance of polar ships operating in various conditions.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
