Article
Engineering, Marine
Mina Tadros, Manuel Ventura, Carlos Guedes Soares
Summary: This paper compares the performance of different types of propellers and evaluates the performance of selected propeller series on a bulk carrier through optimization procedures. The importance of considering hull-propulsor interaction in propeller selection is highlighted, with calculations performed in open-water conditions to validate the optimized parameters.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Marine
Chenyang Zhu, Tomaso Gaggero, Nicholas C. Makris, Purnima Ratilal
Summary: This study analyzes the characteristics of underwater sound radiated by a ship equipped with a controllable pitch propeller and quantifies them using power spectral density, temporal coherence, and spectral coherence. The study finds that the 50% pitch is a crucial point for this ship where tonal characteristics of its underwater radiated sound reach their peak values.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Mina Tadros, Manuel Ventura, C. Guedes Soares
Summary: The study investigates the effects of hull and propeller roughness on ship performance using a combined NavCad and Matlab model. Different combinations of hull and propeller roughness are considered based on ITTC recommendations and expert opinions. The dominant effect is found to be the hull roughness due to its large area, but adding the effect of propeller roughness leads to 1-4% increase in loading ratio and 2-4% increase in fuel consumption. It is concluded that considering both hull and propeller roughness is important for more accurate results compared to considering hull roughness alone.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Mina Tadros, Roberto Vettor, Manuel Ventura, Carlos Guedes Soares
Summary: This study presents a practical optimization procedure that couples the NavCad power prediction tool and a nonlinear optimizer integrated into the Matlab environment, aiming to select a propeller at the engine operating point with minimum fuel consumption. The model takes into account propeller efficiency and engine specific fuel consumption, focusing on reducing fuel consumption for the expected operational profile of the ship.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Antonio Bacciaglia, Alessandro Ceruti, Alfredo Liverani
Summary: This paper presents a methodology for designing and optimizing controllable pitch propellers for small leisure boats, utilizing Particle Swarm Optimization to minimize fuel consumption. Output includes blade geometry and performance data, with a case study demonstrating improved efficiency with this approach.
ENGINEERING WITH COMPUTERS
(2021)
Article
Engineering, Marine
Xu Bai, Hao Ling, Xiao-fang Luo, Yu-shan Li, Li Yang, Ji-chuan Kang
Summary: This study applied the D-S evidence theory and dynamic Bayesian network to establish a novel approach for assessing the reliability and availability of the controllable pitch propeller hydraulic system. The proposed approach included analyzing the working principle of the system, establishing a reliability block diagram, transforming it into a DS-DBN model, learning the parameters and structure of the model, and calculating the system reliability and availability while analyzing the importance of epistemic uncertainty and weak links. The applicability of the approach was verified by comparison with Markov calculations.
Article
Engineering, Marine
Veronica Vigna, Massimo Figari
Summary: This paper presents a method and code for the preliminary sizing of a ship propulsion plant based on a diesel engine, a controllable pitch propeller, and one or more Flettner rotors. The rotor model is integrated into an existing diesel propulsion model to evaluate the ship's fuel consumption and compare wind-assisted propulsive solutions in terms of fuel consumption and CO2 emissions. A 3000-ton Ro-Ro/Pax ferry is used as a case study to analyze the parameters of rotor dimensions and propeller pitch optimization.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Ioli Gypa, Marcus Jansson, Robert Gustafsson, Sofia Werner, Rickard Bensow
Summary: Wind-powered ship propulsion (WPSP) is a concept that relies on wind as the primary source of thrust, while the traditional propulsion system operates as needed. WPSP can greatly reduce emissions, which is a goal of the shipping industry. The Oceanbird, for example, aims to cut emissions by up to 90%. This study focuses on the propeller design process for a wind-powered car-carrier (wPCC) like the Oceanbird, explores the challenges of WPSP, and discusses how to approach automated optimization. Controllable-pitch propellers are found to be suitable for wPCC operation, and functions such as windmilling, feathering, and harvesting are explored. The optimization procedure aims to minimize total energy consumption (TEC) based on a selection of conditions using the potential flow solver MPUF-3A, with blade designer evaluating cavitation through an interactive optimization method. The results show that designing and optimizing for the most highly loaded condition leads to solutions with the lowest TEC.
Article
Engineering, Marine
George Tzortzis, George Sakalis
Summary: This paper proposes a method for determining the optimal operational profile of a ship by adjusting its sailing speed, overcoming the challenge of decreasing accuracy in weather predictions by segmenting the total time horizon of the route into smaller time periods. The interdependency between individual sub-problems is established and examined through the definition of appropriate method parameters.
Article
Engineering, Marine
Nikolaos Charalambopoulos, Elias Xidias, Andreas Nearchou
Summary: This paper introduces the probabilistic roadmap (PRM) concept in maritime transportation to solve the ship weather routing (SWR) problem. A modified PRM algorithm is presented to determine the optimal path in terms of fuel consumption and travel time considering the ship's navigation area and weather conditions. The efficiency of the developed algorithm is demonstrated through simulations in the Aegean archipelagos and the Mediterranean Sea.
Article
Chemistry, Analytical
Wenguang Yang, Zhen Wang, Xiaowen Wang, Yibao Chen, Zhixing Ge, Haibo Yu
Summary: The ability to control pitch variation brings more forms of motion to micro-rotors. By combining CNTs with temperature-sensitive hydrogel material, the hydrogel can be driven by light to produce a recoverable and controlled deformation, demonstrated by the swimming of a bionic jellyfish. Additionally, the variable pitch form of helicopters is innovatively applied to micro-propellers, using a magnetic field for rotation and light illumination for pitch variation, enabling manipulation of the motion behavior of the micro-rotor robot.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Engineering, Aerospace
Keran Cong, Dongli Ma, Liang Zhang, Xinglu Xia, Yuan Yao
Summary: This study constructs a new design framework for passive variable-pitch propellers (PVPP) to simplify their balance module and increase their utility in vertical take-off and landing (VTOL) UAVs. By optimizing the position of the blade-pivot axis, the design results can work efficiently in multiple working conditions and achieve the highest efficiency at a specific advance ratio, which is of practical significance for reducing energy consumption and increasing payload in VTOL UAVs.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Marine
Thai Gia Tran, Hyun Cheol Kim
Summary: In ship design, the matching of engine, propeller, and hull is an analytical process to establish the optimal operating mode. This paper presents a new approach to determining the actual characteristics of the engine, hull, and propeller and how to use them to solve the matching problem under service conditions.
INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING
(2023)
Article
Engineering, Marine
Shukui Liu, Yu Heng Kee, Baoguo Shang, Apostolos Papanikolaou
Summary: This paper presents a transparent methodology for predicting the speed/power performance of a ship under various conditions, considering the influence of biofouling on ship's hull and propeller. The methodology analyzes the impact of surface roughness caused by biofouling on hull resistance and propeller characteristics separately. The results show the decrease in power reserve and increase in required power due to the development of biofouling, highlighting the significant impact of biofouling on ship operation.
Article
Environmental Studies
Hongchu Yu, Zhixiang Fang, Xiuju Fu, Jingxian Liu, Jinhai Chen
Summary: Ship voyage optimization is critical for efficient shipping operations, requiring bridging the gaps between stakeholders' expectations and actual ship operations, thoroughly investigating factors affecting fuel consumption, and integrating various aspects such as cargo operations, emissions, and emission control regulations. The literature on ship voyage optimization is expanding with the development of green maritime transport, and this paper reviews the latest research on emission control-driven voyage optimization to identify current trends and future research directions.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
(2021)
Article
Engineering, Marine
H. S. Abdelwahab, C. Guedes Soares
Summary: This paper presents the uncertainty modelling of experimental results for a physical model of a tanker moored to a terminal inside a port. The aim of the study is to obtain novel results for wave elevation, ship motions, and loads on mooring lines and fenders. The presented physical model study shows that the results can replicate waves and motions with uncertainties less than 9% of the significant amplitudes.
Article
Engineering, Marine
Depeng Liu, Shangmao Ai, Liping Sun, C. Guedes Soares
Summary: A novel structural dynamics model is proposed for the lowering process of a J-lay pipeline, which combines the absolute nodal coordinate formula with the arbitrary Lagrangian-Eulerian description. The material transport boundary and mesh scheme are validated through a pendulum example. A coupled analysis program is developed to study J-lay deployment by a vessel, considering the tensioner as a damper. The lowering process significantly impacts the dynamic characteristics of the touch-down zone.
Article
Engineering, Marine
Albena Veltcheva, C. Guedes Soares
Summary: The time series of wave-induced ship responses are analyzed using the Hilbert-Huang Transform (HHT) method. The results of analyzing numerically simulated motions and loads on a chemical tanker in head waves are compared with experimental data from laboratory model tests. The Empirical Mode Decomposition, a part of the HHT method, is applied to the sea surface elevations and wave-induced vertical motions and bending moments, with good agreement between experimental and numerical data.
Article
Engineering, Marine
Bin Liu, C. Guedes Soares
Summary: The paper reviews the developments in ship collision analysis and discusses the challenges faced by the Accidental Limit State (ALS) design method. It highlights the difficulties in finite element analysis, including the material failure criterion, accuracy of analytical formulas, and acceptance criterion in ALS design. While various material failure criteria have been proposed and validated in fine-meshed models, their accuracy in coarse-meshed models is unclear. Analytical calculations can accurately predict plastic responses of ship structures, but fracture predictions still lack a universal approach. The semi-analytical method shows promise in ALS design, but further improvements in accuracy are necessary. The paper summarizes the technical challenges in ship collision analysis for accurately assessing structural damage using numerical and theoretical methods.
Article
Engineering, Marine
Huidong Zhang, Xinmei Liao, Zhongxu Xin, Hongda Shi, Guedes Soares
Summary: This article experimentally studies the dynamic pressure under wave crests in three scenarios and reveals the influence of nonlinearity and the dispersive effect. In regular waves, nonlinearity modifies the upper and lower sections of the dynamic pressure under the wave crests, with the boundary determined by the strength of nonlinearity. In irregular waves, the dynamic pressure is mainly affected by individual waves within the same wave group, and the dispersive effect dominates its variation, with a greater magnitude than in regular waves. Focused waves show noticeable discrepancies in dynamic pressure due to fundamentally different nonlinearities involved in the focusing process. Thus, the dominant nonlinearity and the dispersive effect must be considered for accurate evaluation of dynamic pressure under wave crests in the ocean.
Article
Engineering, Marine
Arman Kakaie, C. Guedes Soares, Ahmad Kamal Ariffin, Wonsiri Punurai
Summary: This study investigates the fracture mechanics-based fatigue reliability analysis of a submarine pipeline using the Bayesian approach. The proposed framework allows for the estimation of submarine pipeline reliability based on limited experimental data. Bayesian updating method and Markov Chain Monte Carlo simulation are used to estimate the posterior distribution of parameters in a fracture mechanics-based fatigue model considering different uncertainties. The study evaluates failure load cycle distribution and reliability-based performance assessment of API 5L X56 submarine pipelines, and also examines the impact of various parameters on the reliability of the investigated submarine pipeline through sensitivity analysis. The approach used in this study can be applied for uncertainty modeling and fatigue reliability-based performance assessment of different types of submarine pipelines for maintenance and periodic inspection planning.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Lis M. R. Silva, He Li, C. Guedes Soares
Summary: Mixed-integer linear programming is used to translate the routing of service operation vessels for offshore floating wind farms maintenance into mathematical language. The models aim to provide decision-makers with quantified tools for optimal planning of preventive maintenance. By considering factors such as offshore base location, vessel routing, capacity, and fleet composition, the models minimize infrastructure cost. The integration of vehicle fleet size and mix, facility location-allocation, and vehicle-routing with time window improves the current state of the art.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
H. Diaz, C. Guedes Soares
Summary: This paper investigates the selection of an optimal port for offshore wind components storage and assembly to reduce transportation cost. The integrated multi-criteria decision method based on the Ranking Method and the Weighted Product Method is proposed. Twenty-one criteria are identified through data analysis and expert evaluation. Experts in the field evaluate the port selection criteria and establish a ranking to determine the best solution. The findings of this study could benefit port managers and marine transportation associations in improving port facilities and regulations.
Article
Engineering, Marine
Ravindra B. Kudupudi, Ranadev Datta, C. G. Soares
Summary: A 3D coupled method is used to model green water and study its effects on ship deck. Global vessel motions are obtained using impulse response function, while local hydrodynamic forces are computed using CFD solver and Volume of Fluid method. Results show that peak pressure due to green water increases with vessel speed but decreases with the increase of bow rake angle.
Article
Engineering, Marine
Mariana O. Costa, Ricardo M. Campos, C. Guedes Soares
Summary: Machine learning models trained with buoy data are used to develop deep neural networks for improving the quality of ERA5 wind speed and wave height data, with LSTM outperforming MLP significantly. Multiple metrics are used to evaluate the model performance.
Article
Engineering, Marine
Mohamed Hassan, C. Guedes Soares
Summary: This paper presents the performance of a new, floating, mono-hull wind turbine installation vessel (Nordic Wind) in the installation process. The vessel can transport pre-assembled wind turbines from the marshalling port to the offshore installation site. The primary difficulty lies in examining the multibody system's reactions when subjected to combined wind, current, and wave forces.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Haitong Xu, C. Guedes Soares
Summary: This study proposes a data-driven truncated LS-SVM method for estimating the hydrodynamic coefficients of a nonlinear manoeuvring model. The method is validated using experimental data and yields convincing results with reduced parameter uncertainty when using a large training set.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Dapei Liu, H. Rong, C. Guedes Soares
Summary: This study presents a shipping route modelling approach for maritime traffic identification and monitoring around port areas. The approach involves identifying ship trajectories of different motion patterns, estimating route centrelines and boundaries, and promoting maritime traffic safety and effective supervision.
Article
Engineering, Industrial
Dawei Gao, Kai Huang, Yongsheng Zhu, Linbo Zhu, Ke Yan, Zhijun Ren, C. Guedes Soares
Summary: This paper proposes a semi-supervised fault diagnosis method through feature perturbation and decision fusion. To improve the generalization capability of the model, a dual correlation model is constructed, and the structural parameters are adjusted. The final fusion diagnosis is achieved by analyzing high-confidence samples.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2024)
Article
Engineering, Industrial
Dawei Gao, Yongsheng Zhu, Ke Yan, C. Guedes Soares
Summary: This paper introduces a risk assessment framework based on the predictable Transformer network and clustering method, which addresses the issues of inaccurate indicator calculation and difficulty in training deep learning algorithms in traditional methods. The potential collision risk ships are first clustered using a clustering algorithm, and then the Transformer network is used to predict the possible future positions of ships. Finally, the collision risk for ship pairs and the regional collision risk are evaluated based on the predicted results.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2024)
