Article
Engineering, Marine
Teguh Putranto, Mihkel Korgesaar, Kristjan Tabri
Summary: This paper presents the application of the equivalent single layer (ESL) approach for assessing the ultimate strength of ship hull girder using numerical finite element (FE) simulations. The ESL approach replaces the stiffened panel with a single plate, simplifying the modeling process and saving computational time. Two case studies demonstrate the applicability of the ESL approach, with good agreement between ESL predictions, 3D FEM, and IACS incremental-iterative method.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Civil
Shen Li, Do Kyun Kim
Summary: This paper presents a ship hull girder residual strength prediction tool based on the damage index and Smith-type progressive collapse method, and compares it with previous approaches. Recommendations for future research are outlined.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Marine
Weijun Xu, Xueqian Zhou, Chenfeng Li, Huilong Ren
Summary: When the external load exceeds the ultimate strength of the hull girder, the load-carrying capacity is not completely lost due to the supporting and constraint between structure members. The collapse severity of the hull girder under extreme wave load is influenced by various factors, which are analyzed in this paper using an analytic approach. The equations of motion of the hull girder are derived to predict the final severity of collapse. The study also investigates the influence of capacity drop on the severity from an energy point of view. The findings provide important insights for the safety design of ship hull girders.
SHIPS AND OFFSHORE STRUCTURES
(2022)
Article
Engineering, Marine
Nan Zhao, Bai-Qiao Chen, Yan-Qiu Zhou, Zheng-Jie Li, Jia-Jun Hu, C. Guedes Soares
Summary: This paper presents an investigation on the ultimate strength of a ship hull girder model with openings. The experimental and numerical results are in good agreement, providing reference for the design of similar ship structures.
Article
Engineering, Marine
Jose P. Quispe, Segen F. Estefen, Marcelo Igor Lourenco de Souza, John H. Chujutalli, Diogo do Amaral M. Amante, Tetyana Gurova
Summary: This paper investigates the ultimate strength of a small-scale hull box girder through a four-point bending test. Numerical finite element models are developed and compared with experimental results, demonstrating that the IACS formulation better predicts the ultimate bending moment, with the additional advantage of estimating the curvature.
Article
Engineering, Marine
Hongyang Ma, Qinghu Wang, Deyu Wang
Summary: This study investigates the effect of bottom lateral pressure on the ultimate strength and collapse behavior of scaled hull girders. It proposes an empirical scaling criterion to improve the accuracy of converting the ultimate strength between scaled models and full-scale prototypes.
Article
Engineering, Marine
Maria Acanfora, Flavio Balsamo
Summary: This paper discusses fast numerical methods for modeling the behavior of a flooded hull in waves, with a focus on hull girder loads. It proposes a simplified numerical model and four different approaches for modeling damaged ship dynamics based on lumped mass technique. The research compares the outcomes for hull girder loads and ship dynamics in different wave scenarios.
Article
Engineering, Marine
Panayiotis A. Anastopoulos, Kostas J. Spyrou
Summary: The paper establishes a formal foundation for the extrapolation over significant wave height technique used in the Dynamic Stability Criteria of ships. Two new extrapolation models are proposed, accounting for both wave heights and periods, as well as the temporal dependence between consecutive wave heights. The accuracy and sensitivity of these models are evaluated for beam-sea rolling under different spectrum types, providing theoretical justification for their extrapolation capabilities.
Article
Engineering, Industrial
Shen Li, Do Kyun Kim, Simon Benson
Summary: The study proposes a probabilistic approach to evaluate the prediction uncertainty of the ultimate strength of ship hull girders, and discusses the computational uncertainties of the case study vessels. It shows that merchant ships are primarily influenced by the ultimate compressive strength of critical stiffened panels, while naval vessels are also sensitive to the post-collapse response of critical members.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2021)
Article
Engineering, Marine
Qiang Zhong, Guangming Wu, Zhengjun Han, Deyu Wang
Summary: This paper numerically investigates the ultimate strength characteristics of a hull girder with a laser-welded web-core sandwich upper deck. The results demonstrate that the stiffness and ultimate strength of the hull girder can be improved by using the laser-welded sandwich deck. Moreover, the ultimate strength interaction relationships for the hull girder under combined moments are established.
Review
Engineering, Marine
Omid Ferdowsi Hosseinabadi, Mohammad Reza Khedmati
Summary: Aluminium alloys are widely used in the marine industry, particularly in the construction of high-speed vessels. However, the ultimate strength prediction methods developed for steel structures cannot be directly applied to aluminium alloys due to their different material behavior. Factors such as initial imperfections and boundary conditions have a significant impact on the ultimate strength of aluminium ship hull girder elements.
Article
Engineering, Marine
Stamatios Fanourgakis, Manolis Samuelides
Summary: This study evaluates the ultimate bending moment capacity of a chemical oil/product carrier under different temperature conditions, proposing a modified calculation method which shows good agreement with finite element analysis results. The study also determines an analysis technique for stiffened panel ultimate strength analysis at elevated temperatures.
SHIPS AND OFFSHORE STRUCTURES
(2021)
Article
Engineering, Marine
Quang Thang Do, Teguh Muttaqie, Pham-Thanh Nhut, Mai The Vu, Nguyen Dang Khoa, Aditya Rio Prabowo
Summary: This study aims to predict the ultimate residual strength of dented submarine pressure hulls by developing numerical simulations and empirical equations. Dynamic collision and collapse simulations were conducted using numerical approaches, and the accuracy of the method was validated. Empirical equations were established based on the parametric studies and results from Nonlinear Finite Element Analysis (NFEA) database, and their reliability was evaluated.
Article
Engineering, Marine
Arturo Silva-Campillo, Francisco Perez-Arribas
Summary: This paper estimates the influence of torsion box dimensions on local stress distribution and fatigue strength in a 2400TEU feeder-class container ship using a numerical approach. The study compares different structural details through geometrical modifications and assesses the structural influence on stress distribution. Scantling criteria are obtained to improve the design of this important region in container ships.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Civil
Xinying Zheng, Haitao Li, Yi Zhu, Yansong Lv, Chi Zhang, Zhiyuan Mei
Summary: This paper investigates the influence of superstructure on the damage characteristics of ships subjected to a near field underwater explosion. Two hull girder models with different superstructures were designed and experimentally and numerically analyzed. The study discusses the impact of structural modifications and layout changes of the superstructure on the hull girder's damage and explores the overall and local coupling damage characteristics of the hull. The numerical simulations accurately predict the hull girder's damage mode and deformation and show that the presence of the superstructure increases the hull girder's resistance to bending deformation and reduces the damage to the hull bottom grillage.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Marine
M. Tadros, M. Ventura, C. Guedes Soares
Summary: A propeller optimization procedure is developed to reduce fuel consumption by optimizing the parameters such as diameter and pitch, contributing to maritime decarbonization and exhaust emission mitigation.
JOURNAL OF MARINE ENGINEERING AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Ehsan Bahmyari, C. Guedes Soares
Summary: This study develops a non-intrusive probabilistic method to analyze the vibration characteristics of cracked plates with uncertain parameters. Numerical simulations show that the uncertain parameters have a significant impact on the natural frequencies of the cracked plates.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Marine
Hugo Diaz, C. Guedes Soares
Summary: An approach is developed for planning the logistics and installation aspects of a floating wind farm, considering the complexity of the problem due to specific constraints in transportation and manufacturing. The planning tool is based on the analysis of different logistical solutions and aims to ensure the coherence between logistic methods and project performance. A case study is performed for the CENTEC TLP concept in Spanish and Irish waters, revealing the major aspects affecting design and logistics factors. The tool is applicable for the preliminary design of wind farms worldwide.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Civil
C. Lucas, D. Silva, C. Guedes Soares
Summary: This study provides a description of the sea wave climate through climatic directional spectra in three coastal locations. Two spectral wave models are used to produce a 12-year hindcast dataset, which is used to determine average directional spectra and analyze the differences between deep water and shallow water patterns. The study also investigates the probability of occurrence of different spectral classes and their corresponding parameters, providing valuable insights for the assessment of shipping safety near port entrances.
COASTAL ENGINEERING
(2023)
Article
Engineering, Marine
Pouria Amouzadrad, Sarat Chandra Mohapatra, Carlos Guedes Soares
Summary: An analytical model of the interaction between a current load and a moored floating flexible structure was developed using the Timoshenko-Mindlin beam theory. Theoretical solutions for displacement, reflection, and transmission coefficients were obtained using the matching technique and orthogonal model coupling relation. The results were compared with calculations and experimental data from literature, and were found to be consistent with a numerical model. This analysis can provide valuable information for marine engineers designing floating flexible platforms in the marine environment.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Review
Engineering, Marine
Mina Tadros, Manuel Ventura, C. Guedes Soares
Summary: This paper reviews the methods and techniques used to optimize ship hulls over the past six years (2017-2022). It shows the reduction in ship resistance and fuel consumption achieved through these methods to improve energy efficiency and promote maritime decarbonization. Operational research and machine learning are commonly used decision support methods, and four research areas are covered: hull form, hull structure, hull cleaning, and hull lubrication. The study finds that a combination of methods yields more accurate results, and recent research has focused on operational conditions, leading to improved energy efficiency. The findings contribute to mapping scientific knowledge in ship hull technologies, identifying research gaps and opportunities, and supporting holistic approaches for future sustainable solutions.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Hossam S. Abdelwahab, Shan Wang, Josko Parunov, C. Guedes Soares
Summary: This study compares the wave-induced ship motions and loads calculated by five numerical codes in regular waves using different seakeeping theories with existing experimental data. Multiple measures are applied to quantify the uncertainty in the calculated transfer functions. A new measure of uncertainty, the modified total difference, is proposed for determining the uncertainty of individual seakeeping codes based on experimental data. The results indicate that the codes show differences in their predicted results, and the wave-induced loads have higher uncertainties compared to motions.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
P. Pires da Silva, Serge Sutulo, C. Guedes Soares
Summary: Sensitivity analysis is applied to ship manoeuvring mathematical models to deal with uncertainties and simplify the models. The study conducted perturbed simulations of various manoeuvres and found that the model was most sensitive to linear and some nonlinear multivariable parameters. The use of Euclidean metric allowed for a more detailed analysis.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Ying Tang, Shi-Li Sun, Arash Abbasnia, C. Guedes Soares, Hui-Long Ren
Summary: A fully nonlinear hydroelastic numerical method is proposed for fluid-structure interactions of elastic ships. The method solves the boundary value problem using a three-dimensional boundary element method. An effective mesh optimization solution is developed to simulate the instantaneous evolution on the free surface. The results are compared with experimental data and show satisfactory agreement.
JOURNAL OF FLUIDS AND STRUCTURES
(2023)
Article
Engineering, Marine
Caglar Karatug, Yasin Arslanoglu, C. Guedes Soares
Summary: A decision support system based on the adaptive neuro-fuzzy inference system (ANFIS) approach is proposed for condition-based maintenance of ship machinery systems. A case study is conducted for a container ship's main diesel engine to predict the main engine power based on exhaust gas outlet temperatures of cylinders and the main engine shaft RPM. Comparative analyses are carried out to select a suitable ANFIS structure and its specific membership functions. The success of the constructed models is evaluated using error metrics, and the overall ANFIS model with 5 membership functions is determined as the best approach.
Article
Engineering, Marine
H. Diaz, C. Guedes Soares
Summary: This study proposes a cost and financial evaluation model for floating wind farm designs. The model evaluates the cost of offshore farms based on capacity, technical aspects, and implemented technology. It analyzes the costs involved in different phases of farm construction. Simplified equations for the model construction are presented. The study compares financial indicators for different floating concepts and applies the model to a farm of 34 10 MW turbines in a Life Cycle Analysis perspective, providing insights for selecting optimal floating platforms and solutions based on economic and financial aspects.
Article
Engineering, Marine
Yu Chan Guo, S. C. Mohapatra, C. Guedes Soares
Summary: A series of experiments were conducted to investigate the performance of a newly proposed multi-layered flexible membrane breakwater under regular and irregular waves. The effects of various parameters on the efficiency of breakwaters were studied and discussed, including edge conditions, spring stiffness of mooring lines, wave height, wave period, breakwater height, submergence depth, membrane porosity, and membrane length. The wave transmission, reflection, and dissipation coefficients were measured to estimate the performance of the breakwater. The results showed that there is no significant difference in the overall trend of the transmission and dissipation coefficients between regular and irregular waves, but the reflection coefficient behaves differently in these two types of waves.
Article
Engineering, Marine
Zhongchi Liu, C. Guedes Soares
Summary: A numerical model is developed to calculate the mooring forces and cage volumes for a gravity cage system. The effect of structural parameters on the cage capacity and mooring forces is evaluated, and linear wave theory is applied to analyze the influence of waves on the mooring forces.
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)
Article
Engineering, Mechanical
R. Allahvirdizadeh, A. Andersson, R. Karoumi
Summary: The operational safety of high-speed trains on ballasted bridges relies on preventing ballast destabilization. This study explores the impact of epistemic uncertainties on the system using ISRA. Neglecting these uncertainties can lead to overestimation of permissible train speeds and reduced system safety.
PROBABILISTIC ENGINEERING MECHANICS
(2024)
Article
Engineering, Mechanical
Lujie Shi, Leila Khalij, Christophe Gautrelet, Chen Shi, Denis Benasciutti
Summary: This study proposes an innovative Two-phase method based on the Langlie method and the D-optimality criterion to overcome the intrinsic shortcomings of the staircase method used in estimating the fatigue limit distribution. Through simulation-based study, it is demonstrated that the proposed method improves the estimation performance for the mean and standard deviation of the fatigue limit distribution.
PROBABILISTIC ENGINEERING MECHANICS
(2024)
Article
Engineering, Mechanical
Axay Thapa, Atin Roy, Subrata Chakraborty
Summary: This article compares different metamodeling approaches for reliability analysis of tunnels to evaluate their performance. The study found that Kriging and support vector regression models perform well in estimating the reliability of underground tunnels.
PROBABILISTIC ENGINEERING MECHANICS
(2024)
Article
Engineering, Mechanical
Jiaqi Wang, Zhenzhou Lu, Lu Wang
Summary: This paper proposes an efficient method to estimate the FP-GS using reliability updating, avoiding the time-consuming double-loop structure analysis. By utilizing the likelihood function and adaptive Kriging model, the unconditional FP and all conditional FPs can be estimated simultaneously.
PROBABILISTIC ENGINEERING MECHANICS
(2024)
Article
Engineering, Mechanical
Jiaxu Li, Ming Liu, Xu Yan, Qianting Yang
Summary: Wind pressure is essential for architectural design, and this study found that using different probabilistic distribution models can improve the accuracy of reference wind pressure calculation. In the research conducted in Liaoning Province, the extreme value type III model and moment method achieved the best fit. Additionally, probability density functions for wind speed and wind direction were established for further analysis of wind pressure.
PROBABILISTIC ENGINEERING MECHANICS
(2024)
Article
Engineering, Mechanical
Yufan Cheng, Xinchen Zhuang, Tianxiang Yu
Summary: This paper proposes a time-dependent kinematic reliability analysis method that takes into account the truncated random variables and joint clearances, effectively addressing the issues of dimension variables and correlation between joint clearance variables. The proposed method transforms time-dependent reliability into time-independent reliability, greatly reducing computational complexity and obtaining upper and lower bounds of failure probability.
PROBABILISTIC ENGINEERING MECHANICS
(2024)
