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Plant biomass-based composites in the maritime industry: A review Mar. Struct. (IF 3.9) Pub Date : 2024-03-12 Kingsley O. Iwuozor, Taiwo Temitayo Micheal, Kehinde Temitope Micheal, Stephen Sunday Emmanuel, Ebuka Chizitere Emenike, Adewale George Adeniyi
Plant biomass-based composites have emerged as a sustainable alternative to synthetic fillers in the maritime industry. They have gained significant attention due to their unique advantages compared to traditional synthetic fillers. These advantages include greater flexibility, environmental friendliness, biodegradability, renewability, and low density. This study provides a comprehensive evaluation
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A study on the scantling formulae of a stiffener against lateral pressure under the simultaneous action of axial load Mar. Struct. (IF 3.9) Pub Date : 2024-03-05 Daoyang Zhang, Zihan Xu, Tetsuo Okada, Yasumi Kawamura, Ginga Hayakawa, Kinya Ishibashi, Hiroyuki Koyama
Stiffeners support lateral pressure and axial load and are one of the essential members of a ship structure composed of stiffened panels. Their scantling formulae are important to ensure adequate strength against lateral pressure and for the rapid and proper initial design of hull structures. However, the current rule scantling formulae are based on the elastic beam formulation, and the effect of the
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A numerical tool for efficient analysis and optimization of offshore wind turbine jacket substructure considering realistic boundary and loading conditions Mar. Struct. (IF 3.9) Pub Date : 2024-03-03 Zhenyu Wang, Selase Kwame Mantey, Xin Zhang
The jacket substructure is a critical component of the offshore wind turbine (OWT) that is the interface between the transition piece at the top and the grouted connection. This paper presents a comprehensive study on the optimization of a jacket substructure to achieve greater cost efficiency while maintain acceptable structural performance. A fast parametric finite element modelling (FEM) approach
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Robotic welding techniques in marine structures and production processes: A systematic literature review Mar. Struct. (IF 3.9) Pub Date : 2024-02-29 Sufian Imam Wahidi, Selda Oterkus, Erkan Oterkus
Robotic welding has garnered significant attention in the maritime industry for its potential to enhance marine structure quality and optimize production processes. This systematic literature review aims to provide a comprehensive overview of the current state of research in robotic welding for marine applications, encompassing marine structures and production processes, following the PRISMA statement
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Wave impact pressure and pressure impulse on a square column with an overhanging deck in regular waves Mar. Struct. (IF 3.9) Pub Date : 2024-02-29 Nianfan Zhang, Longfei Xiao, Tao Peng, Yinghao Guo, Gang Chen
As the main component of semi-submersible platforms, the deck-column structure is inevitably subjected to severe wave impacts in extreme ocean environments. The wave impact pressure and its time integral, impact pressure impulse, play an important role in the structural design, especially for the analysis of dynamic response. To investigate the characteristics of impact pressure and pressure impulse
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Cabin noise analysis of polar transport vessels under ship‒ice‒water‒air coupling continuous icebreaking based on the S-ALE algorithm Mar. Struct. (IF 3.9) Pub Date : 2024-02-28 Yuanhe Shi, Deqing Yang, Qing Li, Jiangxuan Qin
With the increasing number of ships navigating in polar regions, collisions between ships and sea ice are inevitable. The cabin noise problem caused by ship-ice collisions is significantly different from that of ships navigating in open water, and it seriously affects the comfort and safety of shipboard personnel. To explore the transient cabin noise response caused by ship-ice collisions, this paper
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Solving for hydroelastic ship response using a high-order finite difference method on overlapping grids at zero speed Mar. Struct. (IF 3.9) Pub Date : 2024-02-28 Baoshun Zhou, Mostafa Amini-Afshar, Harry B. Bingham, Yanlin Shao, Šime Malenica, Matilde H. Andersen
This work extends an existing seakeeping tool () to allow for the efficient and accurate evaluation of the hydroelastic response of large flexible ships sailing in waves. solves the linearized potential flow problem using high-order finite differences on overlapping curvilinear body-fitted grids. Generalized modes are introduced to capture the flexural responses at both zero and non-zero forward speed
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Numerical investigation and arrangement optimization on VIV response of marine towing cable with suppression device Mar. Struct. (IF 3.9) Pub Date : 2024-02-22 Li Guo, Yuchao Yuan, Wenyong Tang, Hongxiang Xue
Vortex-induced vibration will occur due to the vortex shedding around the marine towing cable during the towing movement, which will further affect the acquisition efficiency of the marine seismic exploration system. Suppression device is widely used to suppress the VIV response of the marine slenderness structures. In order to investigate the passive suppression mechanism on the marine towing cable
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A data-driven approach for scour detection around monopile-supported offshore wind turbines using Naive Bayes classification Mar. Struct. (IF 3.9) Pub Date : 2024-02-22 Satish Jawalageri, Ramin Ghiasi, Soroosh Jalilvand, Luke J. Prendergast, Abdollah Malekjafarian
This paper proposes a novel data-driven framework for scour detection around offshore wind turbines (OWTs), where damage features are derived from wind and wave-induced acceleration signals collected along the tower. A numerical model of the NREL 5 MW wind turbine, which considers aerodynamic and hydrodynamic loading with soil-structure interaction (SSI) and servo-dynamics, is developed. The model
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FRF-based optimization strategies of actuator on/off status for active vibration isolation systems in underwater vehicle applications Mar. Struct. (IF 3.9) Pub Date : 2024-02-20 Di Wu, Shiruo Zheng, Xiling Xie, Zhiyi Zhang
Active vibration isolation (AVI) is a state-of-the-art technique used to attenuate vibration and noise of the underwater vehicle's power machinery. In certain operational conditions, the pre-installed actuator in AVI system may be redundant, and only a subset of them is required for effective vibration suppression. Therefore, optimization of the actuator configuration is necessary. However, the installation
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A new analytical model to evaluate ship side collisions with large indentation considering interaction effects between structural components Mar. Struct. (IF 3.9) Pub Date : 2024-02-16 Yichi Zhang, Yuchao Yuan, Jiayou Zhou, Wenyong Tang
Ship collision accidents occur frequently and developing rapid prediction methods for structural crashworthiness analysis is of crucial importance in the design phase. This paper proposed a new analytical method to rapidly evaluate side structural responses impacted by a rigid raked bow in right-angle ship collisions with large indentation. Numerical simulations were carried out to help identify and
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Assessment of arresting performance of integral buckle arrestors for sandwich pipes using machine learning techniques Mar. Struct. (IF 3.9) Pub Date : 2024-02-15 Xipeng Wang, Chuangyi Wang, Lin Yuan, Zhi Ding
Integral buckle arrestors are regarded as the most effective arresting devices and can be perfectly adapted to innovative sandwich pipes. In the present study, hyperbaric chamber tests were performed on reduced-scale sandwich pipe specimens equipped with integral arrestors, and the effect of interface bonding behaviour on the crossover pressure was examined. Then, numerical frameworks were proposed
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Behaviour and confinement mechanism of circular concrete-filled aluminum alloy tubular stub columns under axial compression Mar. Struct. (IF 3.9) Pub Date : 2024-02-14 Xi-Feng Yan, Siqi Lin, Yan-Gang Zhao
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Simplified ultimate strength estimation method of rectangular plates under combined loads Mar. Struct. (IF 3.9) Pub Date : 2024-02-12 Kinya Ishibashi, Daisuke Shiomitsu, Akira Tatsumi, Masahiko Fujikubo
A simple method for estimating the ultimate strength of rectangular plates under combined biaxial and shear loads is proposed. Although numerous studies have been conducted to predict the ultimate strength of plates, most conventional methods rely on empirical approaches that involve plastic correction of the elastic buckling strength or curve fitting through nonlinear finite element analysis (NLFEA)
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VIV fatigue assessment by scaling of model test results Mar. Struct. (IF 3.9) Pub Date : 2024-02-08 R. Peek, O. Sequeiros, J. Wu, M. Witz, D. Yin, H. Lie
Bending strain data from 3 well-instrumented VIV model test programs on simply supported bare pipes under uniform flow are processed using rainflow counting to get fatigue damage rates directly. These are presented in terms a dimensionless fatigue-equivalent bending strain amplitude, ϵ, which for the structurally undamped simply supported span under constant axial force undergoing small rotations depends
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Optimal control of wave cycloidal rotors with passively morphing foils: An analytical and numerical study Mar. Struct. (IF 3.9) Pub Date : 2024-02-06 Abel Arredondo-Galeana, Andrei Ermakov, Weichao Shi, John V. Ringwood, Feargal Brennan
In this paper we perform an analytical and numerical study of the performance of a wave cycloidal rotor in irregular waves, with passively morphing foils and variable rotational velocity control. The performance is measured in two ways: Mechanical power, and fatigue damage in a sample stress hot spot located at the fixed end of the hydrofoils. We consider different strategies seeking to both maximise
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Experimental investigation of two shared mooring configurations for a dual-spar floating offshore wind farm in irregular waves Mar. Struct. (IF 3.9) Pub Date : 2024-01-30 Guodong Liang, Tomas Lopez-Olocco, Antonio Medina-Manuel, Leandro Antonio Saavedra-Ynocente, Antonio Souto-Iglesias, Zhiyu Jiang
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Experimental study on the mechanical properties and ultimate strength of accelerated corrosion on hull plates Mar. Struct. (IF 3.9) Pub Date : 2024-01-31 Liang Feng, Jiqian Zheng, Zhao Guo, Zhongyu Cui
This study employed an accelerated corrosion method to investigate the impact of corrosion on the mechanical properties and ultimate strength of S420 steel hull plates. Initially, corrosion was accelerated using H2O2 as a depolarizing agent, and corrosion parameters of the specimens were measured. Subsequently, ten tensile specimens representing five different corrosion states of S420 steel were prepared
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A simulation-based and data-augmented shear force inversion method for offshore platform connector Mar. Struct. (IF 3.9) Pub Date : 2024-01-29 Tao Zhang, Selda Oterkus, Erkan Oterkus, Xueliang Wang, Fang Wang, Song Shiqian
This study introduces a Simulation-Based and Data-Augmented method for shear force inversion to address the challenge of directly measuring shear force on connector pins in multi-module floating platforms. Stress sensors are strategically placed in adjacent areas. Extensive Finite Element simulation scenarios lead to the identification of optimal features sensitive to both force magnitude and direction
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Frequency-domain hydroelastic stress analysis considering local bending effect based on a two-step procedure Mar. Struct. (IF 3.9) Pub Date : 2024-01-29 Shiyuan Zhang, Shixiao Fu, Shuai Li, Torgeir Moan, Yuwang Xu, Zhiyuan Pan
In this study, a two-step stress analysis method to incorporate the global hydroelasticity and local bending effect is developed in the frequency domain. In the first step, the continuous structure is discretized into several rigid modules connected by elastic beams to evaluate global hydroelastic responses, known as the beam-connected-discrete-modules (BCDM) hydroelasticity method. In the second step
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Study on the bending behavior of reinforced thermoplastic pipes (RTPs): A theoretical continuum damage model and experimental tests Mar. Struct. (IF 3.9) Pub Date : 2024-01-27 Xindong Ding, Shuqing Wang, Wencheng Liu, Svein Sævik, Lu Hai
A novel theoretical model is proposed to study the continuum damage mechanical (CDM) behavior of reinforced thermoplastic pipes (RTPs) under bending moments, in which stress analysis of composites, failure evaluation and stiffness degradation are combined in loop calculation. Based on the existing homogenization assumption, the stress distribution of every ply could be calculated according to the equilibrium
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An experimental study on global motions and structural internal loads of a 5 MW floating wind turbine supported on a multi-segment semi-submersible hull in shallow water Mar. Struct. (IF 3.9) Pub Date : 2024-01-26 Yueyuan Ma, Shi Deng, Shuaishuai Wang, Peng Chen, Wenhua Zhao, Zhengshun Cheng
A good understanding of cross-sectional loads of the support structures of floating wind turbines (FWTs) serves as a basis for achieving a reasonable floater design to ensure its safety and reliability over the lifetime at a low cost. While many studies have investigated global motion responses of FWTs, minimal attention has been directed toward the structural load effect analysis of the support structures
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Fatigue analysis of steel catenary risers under coupled cross-flow and in-line vortex-induced vibrations with oblique incoming flow Mar. Struct. (IF 3.9) Pub Date : 2024-01-25 Depeng Liu, Shaojie Li, Shangmao Ai, Liping Sun, C. Guedes Soares
The paper presents a fatigue assessment method for offshore steel catenary risers (SCR) under vortex-induced vibrations (VIV) with multi-directional incoming flow. Firstly, the structural responses are obtained using the finite element method (FEM) in conjunction with a coupled cross-flow (CF) and in-line (IL) wake model. Subsequently, the cyclic stress associated with fatigue life is transformed into
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Optimal design of asymmetrically arranged moorings in a floating production system based on improved particle swarm optimization and RBF surrogate model Mar. Struct. (IF 3.9) Pub Date : 2024-01-17 Yang Yu, Mingren Zhao, Zhenmian Li, Baolei Zhang, Haoxue Pang, Lixin Xu
In offshore oil and gas production, the increasingly complex line system and relatively fixed incidence direction of external loadings have led to asymmetrically distributed mooring lines in floating production systems (FPSs). This study presents an approach for the optimal design of asymmetrically arranged mooring systems in FPSs, considering the mooring radius, azimuth, separate angle, number of
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Numerical analysis and optimization of CFRP buckle arrestors in subsea pipelines Mar. Struct. (IF 3.9) Pub Date : 2024-01-12 Mahmoud Alrsai
This research investigates the collapse mechanisms and crossover pressure capacity of carbon fiber-reinforced polymer (CFRP) buckle arrestors in subsea pipelines. A nonlinear three-dimensional finite element (FE) model was formulated using ANSYS framework, incorporating a nonlinear geometric algorithm to simulate the collapse and crossover failures. The study underscored a good agreement between the
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Vortex-induced vibration response of the cylinder inspired by Terebridae Mar. Struct. (IF 3.9) Pub Date : 2024-01-13 Wei Wang, Penghao Duan
Vortex-induced Vibration (VIV) responses of the three-dimensional cylinders inspired by Terebridae are numerically investigated at the Reynolds number ranges of 0.8 × 104 ≤ Re ≤ 8.0 × 104. By Terebridae, we mean that inspired by its slender structural shape, and whether it can be used to improve the VIV suppression performance of the traditional structures. Three different cylinders are considered
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Experimental and numerical evaluation of a rubber seal in a vacuum suction pad for an automatic mooring system Mar. Struct. (IF 3.9) Pub Date : 2024-01-11 Yeonhong Son, Taehyun Lee, Jung Yup Kim, Hwasup Jang, Jongjik Lee, Youngki Kim, Songkil Kim, Yongjin Kim
The utilization of automatic mooring systems is under extensive interest with the growing technological demands for autonomous ships and smart ports. A vacuum suction pad with a rubber seal, which endures external loads to the moored ship, such as mooring forces, is a critical element in an automatic mooring system. To develop a high-performance automatic mooring system, a vacuum suction pad and a
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Low frequency vibration isolation characteristics and intelligent design method of hull grillage metastructures Mar. Struct. (IF 3.9) Pub Date : 2024-01-12 Dingkang Chen, Yinggang Li, Yufeng Gong, Xunyu Li, Wu Ouyang, Xiaobin Li
In this paper, the wave propagation mechanics theoretical model of hull grillage metastructures with local resonators is established, and the intelligent design method of hull grillage metastructures is proposed based on deep learning. The flexural vibration isolation characteristics of periodic hull grillage structures and the proposed hull grillage metastructures are theoretically studied using the
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Reliability-based design optimization of river-sea-going ship based on agent model technology Mar. Struct. (IF 3.9) Pub Date : 2024-01-05 Yuhan Kang, Zhiyong Pei, Lei Ao, Weiguo Wu
The common ship structural optimization design is a deterministic method without considering uncertain factors, whereas the Reliability-Based Design Optimization (RBDO) can compensate for this deficiency. The RBDO of ship structure is a multi-parameter, high-dimensional, and high-nonlinear optimization solver. There exists a difficulty in guaranteeing accuracy and efficiency due to massive computation
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Empirical formula of buckle propagation pressure for sandwich pipes with polymer core material Mar. Struct. (IF 3.9) Pub Date : 2024-01-02 Guangming Fu, Shuxin Li, Pengkun Lian, Jiankun Yang, Segen F. Estefen, Baojiang Sun
The sandwich pipe, with its high hydraulic pressure resistance and thermal insulation properties, presents itself as a potential choice for deepwater oil and gas exploration. This study developed a 3D finite element numerical model using ABAQUS software to simulate the collapse propagation of sandwich pipes under the high external hydraulic pressure. A parametric analysis was undertaken using a numerical
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Numerical investigations of the effects of spanwise grooves on the suppression of vortex-induced vibration of a flexible cylinder Mar. Struct. (IF 3.9) Pub Date : 2024-01-03 Bo Han, Luchun Yang, Weiwen Zhao, Decheng Wan
Numerical investigations of Vortex-induced Vibration (VIV) suppression of a flexible cylinder with spanwise grooves in the uniform flow have been conducted by viv3D-FOAM-SJTU solver, which imports the thick strip model into OpenFOAM. The Reynolds-averaged Navier-Stokes (RANS) method is adopted to calculate hydrodynamic forces at each fluid strip. The vibrations of cylinder are solved through the Euler-Bernoulli
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Applying Bayesian optimization to predict parameters in a time-domain model for cross-flow vortex-induced vibrations Mar. Struct. (IF 3.9) Pub Date : 2024-01-04 Martin Lieberkind Andersen, Svein Sævik, Jie Wu, Bernt Johan Leira, Helge Langseth
As the demand for harvesting offshore energy increases worldwide, the need for slender structures, such as marine risers and power cables, will increase. The dominating loads for deep water applications will primarily be caused by current-structure interactions, where vortex-induced vibrations (VIV) are known to be a challenging response type to handle correctly during design. Semi-empirical time-domain
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Dynamic responses analysis of crane-blade coupling system for the single blade installation of offshore wind turbine considering the wind effect Mar. Struct. (IF 3.9) Pub Date : 2023-12-30 Li Yin, Dongsheng Qiao, Guoqiang Tang, Jun Yan, Lin Lu, Jinping Ou
The single blade installation method for large-scale offshore wind turbine has the advantage of reduced deck and crane requirements on the installation vessel. Accurately simulating the coupled dynamic responses of the system throughout the entire hoisting process is crucial to avoid spatial interference with surrounding structures. Additionally, the aerodynamic loads, particularly the turbulent wind
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A time-varying copula approach for describing seasonality in multivariate ocean data Mar. Struct. (IF 3.9) Pub Date : 2023-12-28 M.A. Pengfei, Yi Zhang
Characterizing multivariate ocean variables is quite critical for reliability design and risk assessment of marine structures. A robust, precise, and practical multivariate statistic model is necessary for comprehending ocean characteristics. As the time-varying characteristics exist in the ocean data, it is unreasonable to employ a simple constant statistical model to characterize all the multivariate
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Dynamic behaviors of RC caisson subjected to underwater explosions Mar. Struct. (IF 3.9) Pub Date : 2023-12-23 Y.D. Zhou, Y.H. Cheng, Z.Q. Chen, H. Wu
Due to the vulnerability of wharves against accidental attacks, the reinforced concrete (RC) caisson quay wall, as a widely adopted wharf form, is faced with the potential threat of underwater explosions. The present work aims to study the dynamic responses and damage modes of caisson against underwater explosions through the underwater explosion test and numerical simulations. Firstly, four shots
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Numerical study of slamming and whipping loads in moderate and large regular waves for different forward speeds Mar. Struct. (IF 3.9) Pub Date : 2023-12-22 Hui Li, Jian Zou, Yinghao Peng, Xueqian Zhou, Lin Lu, Shuzheng Sun
This paper describes the development of a time-domain hydroelastic numerical model for investigating the slamming and whipping loads imposed on a ship traveling at different forward speeds. The numerical model integrates a beam model, the 3-D Rankine panel model, and the 2-D modified Logvinovich model. The tilt angle of the 2-D profile in the slamming model is determined by the direction of relative
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A hybrid deep learning method for AE source localization for heterostructure of wind turbine blades Mar. Struct. (IF 3.9) Pub Date : 2023-12-18 Nian-Zhong Chen, Zhimin Zhao, Lin Lin
An acoustic emission (AE) and hybrid deep learning networks based damage source localization method for heterostructure of wind turbine blades is proposed in this paper. Firstly, comprehensive data preprocessing is performed, including AE signal denoising, feature extraction, feature selection and normalization. New training features including AE descriptors, features of time, frequency domains and
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Dynamic response analysis of the TetraSpar floater in waves: Experiment and numerical reproduction Mar. Struct. (IF 3.9) Pub Date : 2023-12-15 M. Borg, A. Pegalajar-Jurado, H. Stiesdal, F.J. Madsen, T.R.L. Nielsen, R.F. Mikkelsen, M. Mirzaei, A.K. Lomholt, H. Bredmose
The initial proof of concept model scale test campaign for the TetraSpar floating wind turbine substructure is presented here along with a detailed response analysis and numerical reproduction. The tests were conducted at scale 1:60 in wind and waves with the pitch-regulated DTU 10 MW wind turbine. The floater was tested in two configurations: semi-submersible and spar. The experimental setup and program
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Experimental study of liquid slamming in elastic rectangular tanks under the flip-through impact Mar. Struct. (IF 3.9) Pub Date : 2023-12-06 Limin Shen, Zhijun Wei, Shunying Ji, Dayong Zhang
This paper considers the hydroelasticity effect in liquid slamming. A series of experiments were designed and performed in a nearly two-dimensional (2D) rectangular tanks with four elastic materials. The effect of the Young's modulus on the kinematic and dynamic characteristics of fluid-structure interaction (FSI) during flip-through impact is investigated. Furthermore, the peak values of slamming
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Structural optimization model of confined polyhedral composite subsea pipelines under pressure and thermal fields Mar. Struct. (IF 3.9) Pub Date : 2023-12-07 Xinhui Xiao, Qian Zhang, Guoyong Chang, Yang Liu, Zhaochao Li
This paper investigates the structural optimization of a polyhedral composite subsea pipeline (cylinder) under pressure and thermal fields. The pipeline is confined tightly and deforms inward when it is subjected to external loadings. The interface is frictionless between the pipeline and its surrounding medium. Based on the above assumptions, thin-walled shell principles, and an admissible displacement
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Benchmark on the prediction of whipping response of a warship model in regular waves Mar. Struct. (IF 3.9) Pub Date : 2023-12-07 Joško Parunov, Timoteo Badalotti, Qiandong Feng, Xiechong Gu, Kazuhiro Iijima, Ning Ma, Wei Qiu, Shan Wang, Xueliang Wang, Peng Yang, Yuki Yoshida, Ziwen Zhang, C. Guedes Soares
Results are presented of a benchmark study organised by the Marstruct Virtual Institute on motion and global wave loads on a warship model in regular waves. The aim of the study is the quantification of the uncertainty in numerical whipping predictions. Nine institutions participated in the benchmark with 6 codes, quantifying the hydroelastic responses. The seakeeping methods employed include non-linear
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Impact of climate change on the design of multi-megawatt spar floating wind turbines Mar. Struct. (IF 3.9) Pub Date : 2023-11-29 Maria James, Sumanta Haldar, Subhamoy Bhattacharya
Increased frequency and intensity of extreme events can make offshore constructions unsafe due to the rapidly shifting wind-wave pattern. The consequences of climate change are disregarded by the current performance-based design of offshore wind turbines (OWT). The Statistical Downscaling Model (SDSM) and Artificial Neural Network (ANN) algorithm are used to present a simplified approach to enable
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Damage mechanism and failure risk analysis of offshore pipelines subjected to impact loads from falling object, considering the soil variability Mar. Struct. (IF 3.9) Pub Date : 2023-11-22 Fengyuan Jiang, Enjin Zhao
Trench and burial, as a primary and effective protection measurement for offshore pipelines from impact loads, has received much research attention recently. Previous studies were usually performed based on the assumption that the soil material was homogeneous with deterministic mechanical properties. The soil spatial variability, which is demonstrated to have significant influences on the soil capacity
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A study on auxetic-inspired side structure for enhanced crashworthiness Mar. Struct. (IF 3.9) Pub Date : 2023-11-22 Chunhao Jiang, Lin Lin, Nian-Zhong Chen
A novel type of side structure of ship is proposed, inspired by auxetic materials with a negative Poisson's ratio, for enhancing the crashworthiness of double-hull vessels. Three different unit cells (VRE, HRE, and ARR) are designed and numerical simulation is conducted to demonstrate their resistance to collision. A comparative study on the crashworthiness of the proposed side structures and those
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Concept design and floating installation method study of multi-bucket foundation floating platform for offshore wind turbines Mar. Struct. (IF 3.9) Pub Date : 2023-11-20 Jiale Li, Jijian Lian, Yaohua Guo, Haijun Wang
Efficient installation technologies for foundations and integrated offshore wind turbines play an important role in reducing the construction costs of offshore wind farms. The paper proposes a concept of a multi-bucket foundation floating platform (MBFFP) for the simultaneous transport of several bucket foundation-tower-turbine (BFTT) units, which relies on the fact that the bucket foundation can be
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Moored elastic sheets under the action of nonlinear waves and current Mar. Struct. (IF 3.9) Pub Date : 2023-11-15 Vasily K. Kostikov, Masoud Hayatdavoodi, R. Cengiz Ertekin
This study is concerned with the interaction between nonlinear water waves and uniform current with moored, floating elastic sheets, resembling floating solar panels, floating airports, tunnels and bridges, and floating energy systems. The Green–Naghdi theory is applied for the nonlinear wave–current motion, the thin plate theory is used to determine the deformations of the elastic sheet and Hooke’s
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Dynamics and power performance of a novel wave-powered unmanned surface vehicle Mar. Struct. (IF 3.9) Pub Date : 2023-11-15 LiGuo Wang, Hui Li
Unmanned surface vehicles (USVs) are playing a significant role in the marine science and engineering field, e.g., they have been widely used in measuring ocean waves and currents. However, their operation time and range are limited by the energy carried by internal batteries, and this challenge needs to be urgently addressed. In this study, a novel USV concept that can harvest vibration energy excited
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Heat treatment effects on collapse of JCO-E steel pipes under external pressure: Experiments and numerical predictions Mar. Struct. (IF 3.9) Pub Date : 2023-11-11 Ilias Gavriilidis, Aris G. Stamou, Christos Palagas, Efthimios Dourdounis, Nikos Voudouris, Athanasios Tazedakis, Spyros A. Karamanos
The paper examines the collapse resistance of thick-walled steel pipes, candidates for deep offshore applications, fabricated with the JCO-E process. It describes primarily a combined experimental, numerical and analytical work on the collapse of two JCO-E pipes, a 30-inch-diameter X60 pipe and a 24-inch-diameter X65 pipe, both with D/t ratio approximately equal to 20 and focuses on the effects of
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A prediction method for fatigue crack growth under high stress levels using accumulative plastic damage properties Mar. Struct. (IF 3.9) Pub Date : 2023-11-07 Yuelin Song, Qin Dong, Jiping Zhang, Guoqiang Li, Dongfang Xu, Ping Yang
The objective of this research is to elucidate the characteristics of low-cycle fatigue crack propagation from the perspective of accumulative plastic damage, proposing a reliable prediction model for assessing the crack growth in EH-36 steel subjected to high stress levels. The plastic damage of the crack-tip is measured by the plastic energy at the critical distance point from the crack-tip. And
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Predictions of multi-scale vortex-induced vibrations based on a multi-fidelity data assimilation method Mar. Struct. (IF 3.9) Pub Date : 2023-11-10 Lihua Xu, Jiasong Wang, Michael S. Triantafyllou, Dixia Fan
This paper presents a data assimilation method based on the POD-DeepONet structure to fuse two types of fidelity data from vortex-induced vibration (VIV) problems. The data is mainly focused on amplitude response in different oncoming flow cases from cross-flow (CF) and inline (IL) directions for new flow speed predictions. The low-fidelity data in this paper is calculated from a semi-empirical code
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Time-dependent responses and mooring tensions of a moored floating structure in tsunami waves Mar. Struct. (IF 3.9) Pub Date : 2023-11-10 Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
This study evaluates the effects of tsunami waves on the global performance of a spread-moored Floating Storage Unit (FSU) through tsunami-floater-mooring coupled dynamics simulations. The time-domain equations of motions for the FSU used the Cummins equation with a body-nonlinear method, in which the nonlinear Froude-Krylov and hydrostatic restoring forces were evaluated at the instantaneous tsunami
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Investigating the effects of Coating systems on the degradation behavior of 3D-Printed pressure vessels Mar. Struct. (IF 3.9) Pub Date : 2023-11-11 Birendra Chaudhary, Hewenxuan Li, Akongnwi Nfor Ngwa, Helio Matos
This study investigates the long-term performance of 3D-printed pressure vessels subjected to accelerated aging through water mass infusion. Thermoplastic composites were used to construct the pressure vessels using Material extrusion 3D printing, and subsequent submersion in an ocean water solution at elevated temperatures was employed to simulate accelerated aging. The effectiveness of various coating
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Wave-frequency and low-frequency motions of a deep-draft spar buoy in irregular waves based on a consistent second-order theory Mar. Struct. (IF 3.9) Pub Date : 2023-11-04 Zhiping Zheng, Yanlin Shao, Jikang Chen
This study investigates the effect of horizontal low-frequency (LF) displacements and velocities on the responses of floating structures in irregular waves, with a focus on a deep-draft spar buoy. It employs a consistent second-order hydrodynamic model in the time domain and its two variations to assess the influence of LF motions. To accurately estimate LF velocities from total velocities, an improved
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Ship grounding model tests in a water tank: An experimental study Mar. Struct. (IF 3.9) Pub Date : 2023-11-01 Ling Zhu, Zhihui Zhou, Preben Terndrup Pedersen
Ship grounding experiments are important benchmarks used to validate numerical analysis, analytical and empirical formulation. They are key to the understanding of damage mechanism. A set of small-scale ship model grounding tests over a sharp rock are conducted in a water tank considering the influence of surrounding water. Two damage modes are observed in the grounding tests, Mode I for discontinuous
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An efficient method for estimating the structural stiffness of flexible floating structures Mar. Struct. (IF 3.9) Pub Date : 2023-11-01 Baoshun Zhou, Zhixun Yang, Mostafa Amini-Afshar, Yanlin Shao, Harry B. Bingham
In the hydroelastic analysis of large floating structures, the structural and hydrodynamic analyses are coupled, and the structural stiffness plays an important role in the accurate prediction of the response. However, there is usually a large difference between the longitudinal and the cross-sectional scales of modern ships, and the sectional configurations are generally complex, making it difficult
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SPH numerical model of wave interaction with elastic thin structures and its application to elastic horizontal plate breakwater Mar. Struct. (IF 3.9) Pub Date : 2023-10-29 Yong-kun Chen, Domenico D. Meringolo, Yong Liu
This paper develops a Smoothed Particle Hydrodynamics (SPH) model to simulate wave interaction with elastic thin structures. This is achieved by coupling the δ-SPH and the Total Lagrangian SPH (TL-SPH) models for solving the fluid and structure phases, respectively. To this aim, a multiresolution algorithm within the ghost particles framework is introduced in order to treat the thin elastic components
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Assessing scour prediction models for monopiles in sand from the perspective of design robustness Mar. Struct. (IF 3.9) Pub Date : 2023-10-27 Xinwei Chen, Yang Yu, Lei Wang
Scour constitutes an inevitable occurrence around the monopile foundations of offshore wind turbines (OWTs). The internal forces and deformation of the monopile are profoundly influenced by the scour depth, which can be assessed using various scour prediction models. However, owing to the presence of uncertainties stemming from the intricate marine environment subjected to wave and current loads, these
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Methodology of load effect analysis and ultimate limit state design of semi-submersible hulls of floating wind turbines: With a focus on floater column design Mar. Struct. (IF 3.9) Pub Date : 2023-10-25 Shuaishuai Wang, Torgeir Moan
A main challenge in the design of hull structures of floating wind turbines (FWTs) is to properly estimate the load effects and resistance to perform the safety design check. While great efforts have been devoted to the load effects in terms of global motions, there is a lack of effective methods to calculate internal loads and lateral pressures of hulls in a fully coupled aero-hydro-servo-elastic