Article
Engineering, Ocean
Wentao He, Lingjun Xie, Shuqing Wang, Zhiqiang Hu, De Xie, Changzi Wang
Summary: This paper presents a universal time-domain fatigue evaluation method for mooring fatigue analysis of marine structures. The tension history of the mooring lines is calculated through hydrodynamic analysis, converted into mooring tension cycles, and characterized using a self-integrated program. A comparative study is conducted to investigate the fatigue performance at different positions and corrosion rates of the mooring lines.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Mechanical
Qingrong Zou, Jianxi Zhao, Jici Wen
Summary: In this paper, a quantile regression framework is proposed for modeling fatigue curves, which eliminates the problem of distribution assumption and exhibits robustness in handling non-constant scale issues.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Ocean
Xutian Xue, Nian-Zhong Chen, Yongchang Pu, Lei Chen, Liang Wang
Summary: This paper investigates the effects of curved surfaces on the fatigue lives of mooring chain links tensioned over curved surfaces using fracture mechanics. The results show that fatigue lives decrease significantly on curved surfaces, especially when the diameter of the curved surface decreases.
APPLIED OCEAN RESEARCH
(2021)
Article
Engineering, Mechanical
Anis Mohabeddine, Jose Correia, Pedro Aires Montenegro, Abilio De Jesus, Jose Miguel Castro, Filippo Berto
Summary: The study evaluates experimental fatigue data of retrofitted non-cracked open-hole steel specimens with bonded CFRP, showing significant extension of fatigue life but decreasing extension ratio with higher stress levels. Probabilistic methods are adopted to model the complex behavior of CFRP retrofitted specimens, with the nonlinear CFC model fitting the data well and proposing P-S-N curves for these specimens.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Natalia Ribeiro Marinho, Mariano Andres Arbelo, Geraldo Mauricio Candido, Rita de Cassia Mendonca Sales, Mauricio Vicente Donadon
Summary: This study investigated the Mode I delamination fatigue crack growth behavior in a carbon-epoxy prepreg fabric laminate by evaluating the mean load effects. Results showed that the fatigue crack growth rate was determined as a function of the maximum Mode I strain energy release rate, while the delamination growth rate curve was strongly affected by the applied mean load.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Physical
Simon Moser, Yanxia Feng, Oncay Yasa, Stefanie Heyden, Michael Kessler, Esther Amstad, Eric R. Dufresne, Robert K. Katzschmann, Robert W. Style
Summary: Inspired by the cellular design of plant tissue, this study presents a method for making versatile, tough, highly water-swelling composites. By embedding highly swelling hydrogel particles inside tough, water-permeable, elastomeric matrices, the resulting composites inherit the properties of both hydrogels and elastomers. These hydroelastomers are easy to fabricate, based on widely-available materials, and can be molded or extruded into complex swelling geometries, making them excellent candidates for soft robotics and swelling-based actuation.
Article
Materials Science, Multidisciplinary
P. Carrara, M. Ortiz, L. De Lorenzis
Summary: This study extends the model-free data-driven paradigm to rate-dependent fracture and sub-critical fatigue. The problem is formulated by combining governing equations from variational principles with a set of data points encoding fracture constitutive behavior. The solution is found by satisfying meta-stability conditions and minimizing distances based on closest-point projection. Testing involved different setups with various rate-dependent fracture and fatigue models, with or without white noise.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Engineering, Marine
Yuliang Zhao, Sheng Dong
Summary: This study focuses on predicting fatigue damage of bimodal tension process using surrogate models like artificial neural network and kriging models, aiming to improve accuracy and efficiency. A parametric study, fatigue failure probability calculation, and long-term fatigue analysis under arbitrary wave conditions are conducted. The results show that the surrogate models-based approach provides a more accurate assessment of fatigue failure probability compared to spectral-based methods.
Article
Engineering, Marine
Peng Yang, Jingru Li, Wei Zhang, Dongwei Wu, Xuekang Gu, Qinfen Ma
Summary: The study focuses on the uncertainties of wave loads in structural fatigue analysis of offshore platforms and the influence of model tests on wave loading transfer function. Corrected formulas are derived through statistical regression, factors affecting different seasonal sea states are analyzed, and the distribution law of wave loads and fatigue life of a semi-submersible platform are investigated.
Article
Engineering, Mechanical
Qingrong Zou, Jici Wen
Summary: This study proposes a Bayesian model averaging (BMA) method for estimating the probability density of fatigue life, and verifies its performance through numerical experiments. The results demonstrate that the BMA method is more robust and reliable compared to individual models.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Marine
Engin Balli, Yunlong Zheng
Summary: Recent studies and developments in the wind industry show a trend of larger power ratings for floating offshore wind turbines (FOWTs). However, the increase in turbine size also brings challenges in terms of fatigue damage and maintenance cost of the hull structure. This paper introduces a pseudo-coupled analysis approach to reduce computational expense while maintaining accuracy in fatigue prediction for FOWTs.
Article
Engineering, Mechanical
A. Tridello, C. Boursier Niutta, F. Berto, M. M. Tedesco, S. Plano, D. Gabellone, D. S. Paolino
Summary: In this study, three methodologies for estimating fatigue design P-S-N curves are compared. Experimental validation shows that all three methods provide reliable estimations of the design curves, and the test duration and data requirements can be significantly reduced with appropriate testing strategies.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Review
Engineering, Mechanical
Andrea Tridello, Carlo Boursier Niutta, Massimo Rossetto, Filippo Berto, Davide S. Paolino
Summary: The paper provides a comprehensive review of models for stress-life relation in Very High Cycle Fatigue (VHCF), covering different methods, failure modes, statistical distribution of fatigue life, and characteristics of P-S-N curves. The research aims to highlight the strengths and weaknesses of current models and guide future research directions.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Mechanical
Xiaolu Wei, Chi Zhang, Siyu Han, Zixi Jia, Chenchong Wang, Wei Xu
Summary: A novel method combining LSTM and transfer learning was proposed to predict S-N curves, which can significantly reduce the cost of fatigue property evaluation and realize the conversion among fatigue curves with different test costs.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Physical
Michal Bohm, Adam Nieslony, Szymon Derda, Robert Owsinski, Miloslav Kepka, Ivana Zetkova, Miroslav Zetek, Sarka Houdkova, Mariusz Prazmowski
Summary: Currently, finding a reliable source for design S-N curves is crucial, especially for new 3D-printed materials, due to advancements in fatigue calculation models. Steel components obtained from 3D-printing are popular for important parts of dynamically loaded structures. EN 1.2709 tool steel is commonly used and exhibits good strength properties and high abrasion resistance with the ability to be hardened. However, research has shown that fatigue strength for this material may vary depending on the printing method, resulting in a wide range of fatigue life. This paper presents selected S-N curves and conclusions regarding the fatigue resistance of EN 1.2709 steel after printing using the selective laser melting method, particularly in the tension-compression state. A combined general mean reference and design fatigue curve is provided, incorporating experimental results and literature data for tension-compression loading, which can be used by engineers and scientists for fatigue life calculations using the finite element method.
Article
Materials Science, Multidisciplinary
Guanghong Zhu, Yeping Xiong, Zigang Li, Ling Xiao, Ming Li, Xianxu 'Frank' Bai
Summary: Magnetorheological elastomers (MREs) are smart materials widely used in intelligent structures and devices, with a nonlinear model developed to represent their dynamic behavior. Model parameters were identified through experimental data fitting, showing good repeatability and consistency, and were analyzed for their dependence on strain amplitudes and magnetic fields. The model demonstrated excellent agreement with experimental results regarding the dependence of dynamic moduli on strain amplitudes and magnetic fields.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2021)
Article
Mathematics, Interdisciplinary Applications
Yuan Chen, Yu Qian, Zhixiong Lu, Shuang Zhou, Maohua Xiao, Petr Bartos, Yeping Xiong, Guanghu Jin, Wei Zhang
Summary: HMCVT is able to bear large torque and is suitable for high-power tractors; wet clutch is a crucial component for smooth power transmission; through simulation study and testing, the dynamic characteristics and wet clutch function are verified.
Article
Engineering, Marine
Xifeng Gao, Xiaoyong Liu, Xutian Xue, Nian-Zhong Chen
Summary: This paper summarized a study on the applicability of a fracture mechanics-based approach for calculating the fatigue lives of mooring lines of a floating offshore wind turbine. The results showed that the approach provides a reasonable estimate of fatigue lives and is sensitive to stress concentration factor and initial crack size. Parametric studies and comparative analysis of different mooring designs were conducted to further investigate the effects and applicability of each design.
Article
Thermodynamics
Wei Zhang, Luling An, Yuan Chen, Yeping Xiong, Yabing Liao
Summary: This study proposes a systematic procedure to optimize assembly clamping force, using the concept of equivalent surface and a mathematical optimization model, and employing an improved genetic algorithm to solve the problem while ensuring the safety of composite parts.
ADVANCES IN MECHANICAL ENGINEERING
(2021)
Article
Mechanics
Zhiwei Zhou, Meixia Chen, Yeping Xiong, Wenchao Jia, Wenkai Dong, Kun Xie
Summary: Free and forced vibrations of Z-reinforced sandwich plates stiffened by steel ribs are investigated using experimental and mixed analytical-numerical techniques. The MA-NM method demonstrates high accuracy, with the core material having a greater influence on natural frequencies and the ribs significantly enhancing bend stiffness of the structure.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Marine
Yuanhang Hou, Yeping Xiong, Yonglong Zhang, Xiao Liang, Linfang Su
Summary: Research focuses on finding the optimal engine speed to reduce the Energy Efficiency Operation Index (EEOI) for vessels in operation, taking into account the uncertainty in ice environments. Optimization and analysis considering uncertainty in ice loads and water velocity are necessary for energy efficiency design in vessels sailing in ice areas.
Article
Chemistry, Multidisciplinary
Zhongsheng Chen, Yeping Xiong, Yongxiang Wei
Summary: A binary-like topology optimization scheme is proposed to optimize the bandgap of a piezoelectric metamaterial plate (PMP), along with a coupling model for a self-powered synchronized charge extraction circuit. The results demonstrate that maximum bandgap can be achieved at a given frequency through extended genetic algorithm and numerical analysis.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Ocean
Xutian Xue, Nian-Zhong Chen, Yongchang Pu, Lei Chen, Liang Wang
Summary: This paper investigates the effects of curved surfaces on the fatigue lives of mooring chain links tensioned over curved surfaces using fracture mechanics. The results show that fatigue lives decrease significantly on curved surfaces, especially when the diameter of the curved surface decreases.
APPLIED OCEAN RESEARCH
(2021)
Article
Engineering, Marine
Huande Wang, Yuanhang Hou, Yeping Xiong
Summary: This research aims to improve the energy-saving effect of the YUKUN ship by minimizing the value of the energy efficiency operation index (EEOI) through speed optimization. Uncertainty factors and their mutual coupling effects on EEOI during ship operation are analyzed to determine the design variables for optimized design. The results show that flow velocity and ship wet surface area can enhance EEOI energy-saving effect, while ship cargo loading rate decreases it, and multiple uncertain factors inhibit EEOI.
Article
Engineering, Marine
Yuejin Wan, Yuanhang Hou, Chao Gong, Yuqi Zhang, Yonglong Zhang, Yeping Xiong
Summary: This paper investigates the resistance performance of a submersible surface ship (SSS) in different working cases and scales using experimental and numerical analysis. The resistance of the SSS is predicted using a combination of genetic algorithm and neural network. The research results provide a theoretical reference for optimal design of the SSS resistance in practical applications.
JOURNAL OF MARINE SCIENCE AND APPLICATION
(2022)
Article
Engineering, Marine
Jia Guo, Yuanhang Hou, Xiao Liang, Hongyu Yang, Yeping Xiong
Summary: This paper investigates the path planning problem of unmanned submersible ships. The improved genetic algorithm is utilized to carry out the path planning under single navigation state and multi-navigation states with the aim of energy savings. The results indicate that the energy consumption of navigation paths is influenced by diving depth and velocity. The findings of this research are of great practical significance for path planning of cross-domain unmanned ships.
Article
Engineering, Marine
Yuejin Wan, Yuanhang Hou, Yeping Xiong, Zhenpeng Dong, Yuqi Zhang, Chao Gong
Summary: This paper investigates the integrated design of submersible surface ships and proposes a self-fusion method to modify the ship form. By establishing a surrogate model and using interval optimization analysis, uncertainty in the optimization problem is addressed. The results show a reduction in resistance for the optimized ship, verifying the feasibility of hull shape interval optimization.
Article
Materials Science, Multidisciplinary
Guanghong Zhu, Zigang Li, Hulun Guo, Xianxu Frank Bai, Yeping Xiong, Ming Li
Summary: A fractional rheological model was developed to study the influence of material elasticity and viscosity on MRE-based isolation systems. The model parameters were identified by fitting experimental data, and the model showed good consistency and repeatability. The transmissibility was calculated theoretically and numerically, with excellent agreement between the two methods. The analysis of model parameters provided insights into the dynamic behavior of vibration isolation systems. A control strategy based on coincidence frequency was developed to protect sensitive equipment against periodic vibrations. The effectiveness of fuzzy control algorithm in isolating sensitive equipment against random motions was validated through comparison with passive isolation.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Engineering, Marine
Shaojuan Su, Yujie Wu, Yeping Xiong, Fangxin Guo, Haibo Liu, Qixiang Cheng
Summary: In this paper, a new type of shallow-water seismic survey vessel is proposed to tackle the issues faced by traditional vessels in shallow-water marine resources exploration. By conducting ship model experiments and employing numerical methods, the resistance and shallow-water characteristics of the proposed vessel are obtained, revealing the influence of shallow water effect on resistance and flow field. The experimental data obtained from the ship model experiment were used to validate the numerical methods, and the numerical results showed good agreement with the experimental results. The paper also provides insights into the distribution of wave, pressure, and flow fields under different water depth conditions, explaining the causes of increased resistance in shallow water and providing design references for shallow-water seismic survey vessels.
Article
Computer Science, Information Systems
Zhongsheng Chen, Hao Sheng, Lianying Liao, Chengwu Liu, Yeping Xiong
Summary: This paper proposes a method that combines deep learning with blade tip-timing (BTT) vibration reconstruction. By utilizing a specific convolutional neural network (CNN) and building a multi-coset BTT measurement model, this method achieves accurate and efficient reconstruction of vibration orders under variable speeds, outperforming classical compressed sensing (CS) algorithms.
Article
Engineering, Marine
Alba Ricondo, Laura Cagigal, Beatriz Perez-Diaz, Fernando J. Mendez
Summary: This research presents a site-specific metamodel based on the SWASH numerical model simulations, which can predict coastal hydrodynamic variables in a fast and efficient manner. The metamodel uses downscaled and dimensionality reduced synthetic database to accurately reproduce wave setup, wave heights associated with different frequency bands, and wave runup. This method has great potential in coastal risk assessments, early warning systems, and climate change projections.
Article
Engineering, Marine
Xiao Yu, Wangjun Ren, Bukui Zhou, Li Chen, Xiangyun Xu, Genmao Ren
Summary: This study investigated and compared the compression responses and energy absorption capacities of coral sand and silica sand at a strain rate of approximately 1000 s-1. The results showed that coral sand had significantly higher energy absorption capacity than silica sand due to its higher compressibility. The study findings suggest that using poorly graded coral sand can improve its energy absorption capacity.
Article
Engineering, Marine
Jingxi Zhang, Junmin Mou, Linying Chen, Pengfei Chen, Mengxia Li
Summary: This paper proposes a cooperative control scheme for ship formation tracking based on Model Predictive Control. A predictive observer is designed to estimate the current motion states of the leader ship using delayed motion information. Comparative simulations demonstrate the effectiveness and robustness of the proposed controller.
Article
Engineering, Marine
Yu Yao, Danni Zhong, Qijia Shi, Ji Wu, Jiangxia Li
Summary: This study proposes a 2DH numerical model based on Boussinesq equations to investigate the impact of dredging reef-flat sand on wave characteristics and wave-driven current. The model is verified through wave flume experiments and wave basin experiments, and the influences of incident wave conditions and pit morphological features on wave characteristics are examined.
Article
Engineering, Marine
Jayanta Shounda, Krishnendu Barman, Koustuv Debnath
Summary: This study investigates the double-average turbulence characteristics of combined wave-current flow over a rough bed with different spacing arrangements. The results show that a spacing ratio of p/r=4 offers the highest resistance to the flow, and the double-average Reynolds stress decreases throughout the flow depth. The advection of momentum-flux of normal stress shows an increase at the outer layer and a decrease near the bed region after wave imposition. Maximum turbulence kinetic energy production and diffusion occur at different layers. The turbulence structure is strongly anisotropic at the bottom region and near the outer layer, with a decrease in anisotropy observed with an increase in roughness spacing.
Article
Engineering, Marine
Meng Zhang, Lianghui Sun, Yaoguo Xie
Summary: The research proposes a method for online identification of wave bending and torsional moment in hull structures. For structures without large openings, the method optimizes sensor positions and establishes a mathematical model to improve accuracy. For structures with large openings, a joint dual-section monitoring method is proposed to simultaneously identify bending and torsional moments in multiple key cross sections.
Article
Engineering, Marine
Longming Chen, Shutao Li, Yeqing Chen, Dong Guo, Wanli Wei, Qiushi Yan
Summary: This study investigated the dynamic response characteristics and damage modes of pile wharves subjected to underwater explosions. The results showed that the main damaged components of the pile wharf were the piles, and inclined piles had a higher probability of moderate or more significant damage compared to vertical piles. The study also suggested that replacing inclined piles with alternative optimized structures benefits the blast resistance of pile wharves.
Article
Engineering, Marine
I. -C Kim, G. Ducrozet, V. Leroy, F. Bonnefoy, Y. Perignon, S. Bourguignon
Summary: Previous research focused on the accuracy and efficiency of short-term wave fields in specific prediction zones, while we developed algorithms for continuous wave prediction based on the practical prediction zone and discussed important time factors and strategies to reduce computational costs.
Article
Engineering, Marine
Hang Xie, Xianglin Dai, Fang Liu, Xinyu Liu
Summary: This study investigates the load characteristics of a three-dimensional stern model with pitch angle through a drop test, and reveals complex characteristics of pressure distribution near the stern shaft. The study also shows that the vibration characteristics of the load are influenced by the drop height and pitch angle, with the drop height having a greater effect on the high-frequency components.
Article
Engineering, Marine
Hangyuan Zhang, Wanli Yang, Dewen Liu, Xiaokun Geng, Wangyu Dai, Yuzhi Zhang
Summary: The deep-water bridge is more vulnerable to earthquake damage than the bridge standing in air. The larger blocking ratio has a significant impact on the added mass coefficient, which requires further comprehensive study. The generation mechanism of block effect is analyzed using numerical simulation software ANSYS Fluent. The results show that the recirculation zone with focus reduces the pressure on the back surface of the cylinder, resulting in the peak value of in-line force not occurring synchronously with the peak value of acceleration. The change in position and intensity of the recirculation zone with focus, as well as the change in water flow around the cylinder surface, are identified as the generation mechanism of the block effect, which has a 10% influence on the hydrodynamic force. The changing rule of the added mass coefficient with blocking ratio is discussed in detail, and a modification approach to the current added mass coefficient calculation method is suggested. Physical experiments are conducted to validate the modification approach, and the results show that it is accurate and can be used in further study and real practice.
Article
Engineering, Marine
Golnesa Karimi-Zindashti, Ozgur Kurc
Summary: This study examines the performance of an in-house code utilizing a deterministic vortex method on the rotation of circular and square cylinders. The results show that rotational motion reduces drag forces, suppresses fluctuating forces, and increases lift forces. The code accurately predicts vortex shedding suppression and identifies the emergence of near-field wakes in the flow over rotating square cylinders.
Article
Engineering, Marine
George Dafermos, George Zaraphonitis
Summary: The survivability of damaged ships is of great importance and the regulatory framework is constantly updated. The introduction of the probabilistic damage stability framework has rationalized the assessment procedure. Flooding simulation tools can be used to investigate the dynamic response of damaged ships.
Article
Engineering, Marine
Xuyue Chen, Xu Du, Chengkai Weng, Jin Yang, Deli Gao, Dongyu Su, Gan Wang
Summary: This paper proposes a real-time drilling parameters optimization method for offshore large-scale cluster extended reach drilling based on intelligent optimization algorithm and machine learning. By establishing a ROP model with long short-term memory neurons, and combining genetic algorithm, differential evolution algorithm, and particle swarm algorithm, the method achieves real-time optimization of drilling parameters and significantly improves the ROP.
Article
Engineering, Marine
Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
Summary: This study investigates the dynamic behavior of a moored submerged floating tunnel (SFT) under tsunami-like waves through numerical simulations and sensitivity tests. The results show that design parameters significantly affect the dynamics of the SFT system and mooring tensions, with shorter-duration and higher-elevation tsunamis having a greater impact.
Article
Engineering, Marine
G. Clarindo, C. Guedes Soares
Summary: Environmental contours are constructed using the Inverse-First Order Reliability Method based on return periods. The paper proposes the use of the Burr distribution to model the marginal distribution of long-term significant wave heights. The newly implemented scheme results in different environmental contours compared to the reference approach.
