Marine Structures最新文献

{"title":"A study on the scantling formulae of a stiffener against lateral pressure under the simultaneous action of axial load","authors":"Daoyang Zhang ,&nbsp;Zihan Xu ,&nbsp;Tetsuo Okada ,&nbsp;Yasumi Kawamura ,&nbsp;Ginga Hayakawa ,&nbsp;Kinya Ishibashi ,&nbsp;Hiroyuki Koyama","doi":"10.1016/j.marstruc.2024.103595","DOIUrl":"https://doi.org/10.1016/j.marstruc.2024.103595","url":null,"abstract":"<div><p>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 simultaneous axial stress is considered differently by the rule as a coefficient for reducing the allowable stress. In this study, based on the fully plastic moment under the action of axial stress, the stiffener bending strength corresponding to the plastic hinge formation criteria (initial hinge and plastic collapse) was determined using simple theoretical formulae considering the additional lateral force induced by the axial stress on the deflected stiffener. Subsequently, the structural behaviors were investigated comprehensively by theoretical parametric studies based on various stiffener scantlings and loading combinations, which were further compared with the results of finite element analysis (FEA) based on the residual deflection criterion, thereby verifying the validity of the theoretical proposals. Consequently, by combining the findings from the theoretical and numerical investigations, the effect of the axial stress on the stiffener bending strength was expressed as closed-form coefficients. These proposed axial stress coefficients were verified to govern the actual structural behaviors well and are expected to provide a rational basis and contribute to improving rule-scantling formulae.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103595"},"PeriodicalIF":3.9,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0951833924000236/pdfft?md5=9f6d4854a21f2b9740d7b04e6d47e628&pid=1-s2.0-S0951833924000236-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140041714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A numerical tool for efficient analysis and optimization of offshore wind turbine jacket substructure considering realistic boundary and loading conditions","authors":"Zhenyu Wang,&nbsp;Selase Kwame Mantey,&nbsp;Xin Zhang","doi":"10.1016/j.marstruc.2024.103605","DOIUrl":"https://doi.org/10.1016/j.marstruc.2024.103605","url":null,"abstract":"<div><p>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 for jacket substructures was firstly proposed. The generated models took into account realistic loading conditions, including self-weight, wind load and section-dependent wave load, and soil-pile interaction. Parametric studies were conducted afterwards to investigate the trends of the mass and response of the jacket substructure with respect to the variation of geometric and sectional parameters. Optimizations of the jacket substructure were carried out using parametric optimization and numerical genetic algorithm (GA) optimization under three different optimization strategies corresponding to three groups of objective and constraint functions. The trends obtained by parametric analysis were used to guide the parameter selection in parametric optimization, while a rank-based mutation GA was established with the proposed efficient FEM embedded in as the solver to the optimization objective and constraint functions. Parametric optimization gained its advantage in computational efficiency, and the mass reduction were 6.2%, 10% and 14.8% for the three strategies respectively. GA optimization was more aggressive as the mass reductions were 16.8%, 22.3% and 34.3% for the three strategies, but was relatively more computational intense. The two proposed optimization methods and the three optimization strategies are both expected to be applied in practical engineering design of OWT jacket substructure with good optimization output and high computational efficiency.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103605"},"PeriodicalIF":3.9,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140015840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Robotic welding techniques in marine structures and production processes: A systematic literature review","authors":"Sufian Imam Wahidi ,&nbsp;Selda Oterkus ,&nbsp;Erkan Oterkus","doi":"10.1016/j.marstruc.2024.103608","DOIUrl":"https://doi.org/10.1016/j.marstruc.2024.103608","url":null,"abstract":"<div><p>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 and guidelines. The review encompasses various facets, including welding techniques, processed materials, types of robotic welding, technological advancements, potential advantages, and challenges encountered when implementing robotic welding systems in the maritime sector. The results spotlight the pivotal role of gas metal arc welding (GMAW) in propelling robotic welding technology forward, while wire arc additive manufacturing (WAAM) has experienced a notable surge in popularity, signifying its potential to catalyze significant changes in maritime manufacturing processes. Notably, the predominant use of robotic welding centers on carbon steel materials. However, ongoing advancements indicate a growing diversification, with the incorporation of advanced materials like high-strength alloys on the horizon. Additionally, the utilization of 6-axis robot welding in conjunction with fully autonomous systems has emerged as a versatile and potent instrument that has revolutionized welding methodologies across various maritime research domains. Robotic welding provides a number of advantages, such as increased productivity, higher quality, adherence to industry standards, adaptation to confined and dangerous locations, and facilitation of innovative construction techniques. Nevertheless, adoption of this cutting-edge technology is not without challenges. By synthesizing the results from several investigations, this research study offers useful insights into the current knowledge gaps, emerging trends, and future prospects for the growth of robotic welding in maritime applications.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103608"},"PeriodicalIF":3.9,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0951833924000364/pdfft?md5=fc6590cd6330f5b48aa183b1d18d6ff5&pid=1-s2.0-S0951833924000364-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139993208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wave impact pressure and pressure impulse on a square column with an overhanging deck in regular waves","authors":"Nianfan Zhang ,&nbsp;Longfei Xiao ,&nbsp;Tao Peng ,&nbsp;Yinghao Guo ,&nbsp;Gang Chen","doi":"10.1016/j.marstruc.2024.103604","DOIUrl":"https://doi.org/10.1016/j.marstruc.2024.103604","url":null,"abstract":"<div><p>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, wave impact tests on a square column with overhanging deck were carried out under a series of regular waves. Wavelet denoising technique and empirical mode decomposition (EMD) method were employed to remove the noise interference and the dynamic amplification effect from raw data. Considering the stochastic feature, statistical analysis of pressure impulse was performed based on generalized extreme value (GEV) and two-parameter Weibull distribution models. The results show the strong variability of the wave pressure impulse and the necessity of statistical analysis even in regular waves. The peak impact pressure is more sensitive to the variation of initial air gap and column incline angle than the pressure impulse. The probability distribution of extreme pressure impulse agrees well with the GEV distribution and is mainly distinguished by the shape parameter. Furthermore, the probability distribution of extreme pressure impulse is significantly affected by the initial air gap, and the effect is also related to wave parameters. The present research reveals the probability distribution of wave pressure impulse in regular waves and lays a foundation for the statistical analysis of pressure impulse in irregular waves.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103604"},"PeriodicalIF":3.9,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139999858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solving for hydroelastic ship response using a high-order finite difference method on overlapping grids at zero speed","authors":"Baoshun Zhou ,&nbsp;Mostafa Amini-Afshar ,&nbsp;Harry B. Bingham ,&nbsp;Yanlin Shao ,&nbsp;Šime Malenica ,&nbsp;Matilde H. Andersen","doi":"10.1016/j.marstruc.2024.103602","DOIUrl":"https://doi.org/10.1016/j.marstruc.2024.103602","url":null,"abstract":"<div><p>This work extends an existing seakeeping tool (<em>OceanWave3D-seakeeping</em>) to allow for the efficient and accurate evaluation of the hydroelastic response of large flexible ships sailing in waves. <em>OceanWave3D-seakeeping</em> 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, but we focus on the zero speed case here. The implementation of the hydroelastic solution is validated against experimental measurements and reference numerical solutions for three test cases. The ship girder is approximated by an Euler–Bernoulli beam, so only elastic bending deformation is considered and sheer effects are neglected. Some controversy has long existed in the literature about the correct form of the linearized hydrostatic stiffness terms for flexible modes, with Newman (1994) and Malenica and Bigot (2020) arriving at different forms. We provide here a complete derivation of both forms (including the gravitational terms) and demonstrate the equivalence of the buoyancy terms for pure elastic motions.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103602"},"PeriodicalIF":3.9,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0951833924000303/pdfft?md5=4696b220913724a646396cc15dfe1959&pid=1-s2.0-S0951833924000303-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139993207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cabin noise analysis of polar transport vessels under ship‒ice‒water‒air coupling continuous icebreaking based on the S-ALE algorithm","authors":"Yuanhe Shi ,&nbsp;Deqing Yang ,&nbsp;Qing Li ,&nbsp;Jiangxuan Qin","doi":"10.1016/j.marstruc.2024.103601","DOIUrl":"https://doi.org/10.1016/j.marstruc.2024.103601","url":null,"abstract":"<div><p>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 performs numerical studies of the ice load, compares the ice resistance values of experimental and empirical formulas through the ship-ice-water‒air coupled collision method, and gives the sound source load excitation. Then, in the frequency domain acoustic analysis, the acoustic response of the typical cabin noise under icebreaking excitation and coupling excitation is calculated by using the acoustic-structure coupling analysis model and statistical energy analysis model, respectively. The effect of ship transient cabin noise on personnel comfort is analyzed according to the standard of ship noise. The results show that the transient cabin noise is scattered from the collision position to the stern at a certain angle and decays along the length, width, and superstructure of the ship as the frequency increases. The transient cabin noise under coupled excitation shows an M-shape distribution in the ship ranges. The icebreaking excitation mainly affects the transient cabin noise within 1000 Hz, with strong nonlinearity at a low-frequency band. The sound source excitation has a more obvious effect on the cabin noise in the middle-high frequency bands. The A-weighted sound pressure level of transient cabin noise in accommodation cabins and wheel houses during icebreaking operations of polar ships exceeds 5–20 dB(A) of the standard limit, which seriously affects the comfort of people on board. The research results of this paper can provide a reference for the study of ship-ice collision-induced transient cabin noise and the formulation of relevant standards.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103601"},"PeriodicalIF":3.9,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139993209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation and arrangement optimization on VIV response of marine towing cable with suppression device","authors":"Li Guo ,&nbsp;Yuchao Yuan ,&nbsp;Wenyong Tang ,&nbsp;Hongxiang Xue","doi":"10.1016/j.marstruc.2024.103598","DOIUrl":"https://doi.org/10.1016/j.marstruc.2024.103598","url":null,"abstract":"<div><p>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, a numerical VIV model is proposed to predict the VIV response of marine towing cable with buoyancy modules. The steady-state and VIV characteristics of marine towing cable with different coverage, layout and slenderness ratio are studied firstly. The parameters have a nonlinear relationship with the VIV response of cable and excessive arrangement of buoyancy module will enlarge the vibration displacement. Where to install a limited number of suppression devices is a challenge for practical engineering. Genetic algorithm is introduced to solve the optimization problem of the suppression device arrangements in this paper. The suppression device arrangement of towing cable will evolve in the direction of decreasing cable VIV displacement until reaching the optimal arrangement. The proposed method is demonstrated by comparing with some typical working conditions. It turns out that the proposed method can perform the optimization design of the suppression device arrangement efficiently. The VIV displacement of cable can be reduced obviously through the optimization design.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103598"},"PeriodicalIF":3.9,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139935563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A data-driven approach for scour detection around monopile-supported offshore wind turbines using Naive Bayes classification","authors":"Satish Jawalageri ,&nbsp;Ramin Ghiasi ,&nbsp;Soroosh Jalilvand ,&nbsp;Luke J. Prendergast ,&nbsp;Abdollah Malekjafarian","doi":"10.1016/j.marstruc.2023.103565","DOIUrl":"https://doi.org/10.1016/j.marstruc.2023.103565","url":null,"abstract":"<div><p>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 is used to simulate the acceleration responses along the tower for a healthy structure, and a structure affected by progressive scour. A data segmentation process is initially performed on the collected data, which is followed by a feature selection scheme based on the analysis-of-variance (ANOVA) algorithm, to eliminate irrelevant characteristics from the time domain feature set of responses. The proposed framework consists of two main components: (a) offline training, and (b) real-time classification. The acceleration responses collected from the healthy structure and the structure subjected to three different damage scenarios (different scour depths) and under various load conditions, are used in the offline training mode. The selected feature vector from the feature extraction process is used as input to a Naive Bayes classifier (NBC) algorithm to train the model. In the real-time classification, a prediction of the scour depth affecting the structure is performed using a new dataset simulated from unseen load cases and scour conditions of the OWT. The results show that the model trained in the offline stage can predict the scour depth in the real-time monitoring stage with performance measures over approximately 94%.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103565"},"PeriodicalIF":3.9,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139935562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FRF-based optimization strategies of actuator on/off status for active vibration isolation systems in underwater vehicle applications","authors":"Di Wu ,&nbsp;Shiruo Zheng ,&nbsp;Xiling Xie ,&nbsp;Zhiyi Zhang","doi":"10.1016/j.marstruc.2024.103603","DOIUrl":"https://doi.org/10.1016/j.marstruc.2024.103603","url":null,"abstract":"<div><p>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 position of the actuators is fixed during the design stage, and only the on/off status of the actuators is adjustable. Additionally, the structural complexity of the practical system poses challenges to the conventional state-space-equation-based optimization methods. In this paper, an optimization strategy based on frequency response functions (FRFs) is proposed to optimize the on/off status of the actuators. The optimization problem of actuator status is formulated as an 0–1 nonlinear programming, which can be solved by teaching-learning based optimization (TLBO), a heuristic algorithm. Simulation and experimental results demonstrate that the proposed optimization strategy can effectively determine the optimal actuator configuration under specific disturbance conditions, with only a subset of the actuators being activated to achieve sufficient vibration suppression.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103603"},"PeriodicalIF":3.9,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139914769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new analytical model to evaluate ship side collisions with large indentation considering interaction effects between structural components","authors":"Yichi Zhang ,&nbsp;Yuchao Yuan ,&nbsp;Jiayou Zhou ,&nbsp;Wenyong Tang","doi":"10.1016/j.marstruc.2024.103596","DOIUrl":"https://doi.org/10.1016/j.marstruc.2024.103596","url":null,"abstract":"<div><p>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 understand the mechanisms of structural deformation of primary structural members. The side structure is divided into different key components and a new analytical model for evaluating the hull shell plating and stiffeners under large indentation subjected to lateral impact was developed. The model considered the shell plating deformation in three different phases, denting, ruptured and tearing phase. Different formulas were derived to cover the analysis from minor deflection to large indentation. Combined with other existing formulas for stiffened decks under in-plane loads, an integrated method was proposed to predict the total resistance and energy dissipation of the side structure. The newly developed method innovatively considered the coupling effects and interactions between various structural members in the collision analysis by dynamically correcting some parameters theoretically. The newly developed method was verified against numerical simulations of full-scale ship collisions through five typical scenarios and good accuracy was achieved. The newly developed method is valuable for use in the preliminary design phase, especially for severe collision scenarios.</p></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"95 ","pages":"Article 103596"},"PeriodicalIF":3.9,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139744342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}