Marine Structures最新文献

{"title":"Mitigating load responses of high-speed catamarans via ride control systems: An experimental study in irregular waves, part1: Slam events","authors":"Ehsan Javanmard ,&nbsp;Javad A. Mehr ,&nbsp;Damien S. Holloway ,&nbsp;Michael R. Davis ,&nbsp;Jason Ali-Lavroff","doi":"10.1016/j.marstruc.2025.103816","DOIUrl":"10.1016/j.marstruc.2025.103816","url":null,"abstract":"<div><div>This study aims to investigate the influence of a Ride Control System (RCS) on the load responses of a 2.5 m hydroelastic segmented catamaran model, which represents a 112 m high-speed catamaran. The efficacy of different control algorithms in mitigating slam rates and magnitudes was quantified by comparing results with those obtained for a bare hull with the No RCS control mode. Towing tank experiments were conducted in irregular head seas with a forward speed of 2.89 m/s (37 knots full-scale) at two significant wave heights. The results revealed that the nonlinear pitch control algorithm was the most efficient, achieving an impressive 96% reduction in slam occurrence, a 70% reduction in maximum slam magnitude, and a 66% reduction in maximum slam-induced sagging bending moments in moderate waves. Additionally, it was revealed that increases in wave height elevated the probability of slams, amplified variance in the distribution of slam loads and slam-induced bending moments and reduced the influence of the RCS in mitigating structural loads on the catamaran model. It was shown that irregular sea slam responses can be predicted from regular sea data, based on regular tests at a frequency corresponding to the modal period of the irregular sea case, with an accuracy of within 8 % for moderate waves and within 15 % at large waves.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103816"},"PeriodicalIF":4.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891722","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":"CFD modeling of three-dimensional gap resonances between side-by-side barges under combined wave and current excitation","authors":"Yunfeng Ding ,&nbsp;Jens Honoré Walther ,&nbsp;Hui Liang ,&nbsp;Yanlin Shao","doi":"10.1016/j.marstruc.2025.103826","DOIUrl":"10.1016/j.marstruc.2025.103826","url":null,"abstract":"<div><div>The present study investigates three-dimensional gap resonance between two fixed side-by-side barges under combined wave and uniform current excitation using a fully nonlinear numerical wave tank based on the Navier–Stokes equations. It examines how currents aligned with regular waves affect the gap response under head and beam seas. In beam seas, the free surface in the gap primarily exhibits a modal-type response in the form of a standing wave. The maximum gap response, consistently occurring at the midpoint of the gap, increases gradually with the current speed. Conversely, in head seas, the maximum response decreases slightly with increasing current speed, and the occurring location shifts downstream. Moreover, resonant free-surface responses along the gap in head seas manifest as propagating waves rather than modal-type standing waves, consisting of a wider spectrum of wave components around the resonant ones and traveling faster than the incident waves regardless of current speed. The wavelengths of those resonant waves tend to increase with increasing current speed. Additionally, the presence of current significantly enlarges the transverse first-harmonic and mean-drift wave forces on the barges under beam-sea conditions. The study highlights the necessity of considering current effects on three-dimensional gap resonances in marine operations at coastal and offshore locations.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103826"},"PeriodicalIF":4.0,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886643","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":"Structural integration of glass in yacht superstructures through adhesive bonding – A numerical analysis","authors":"Danie Wium ,&nbsp;Evert Lataire ,&nbsp;Jan Belis","doi":"10.1016/j.marstruc.2025.103834","DOIUrl":"10.1016/j.marstruc.2025.103834","url":null,"abstract":"<div><div>Large luxury yachts often include expansive windows in their designs. The current method of bonding the glass window panes to the supporting structure using a flexible adhesive often necessitates reinforcement in the metallic structure as window size increases. This paper explores an alternative solution where glass is structurally integrated into the yacht. The challenges of integrating glass using structural adhesive bonding is investigated using finite element analysis, focusing on yacht loads and structural deformation. A novel yacht concept with an expansive glazing structure is utilized for this investigation. Following a global load analysis, it is concluded that the glazing structure plays a near negligible role in global strength. Subsequently, a parametric study of the glazing structure is performed under local yacht loads, considering different adhesive bond stiffnesses and glass panel thicknesses. The adhesive bonds are modelled using a contact function with cohesive behaviour. An adhesive Young’s modulus ranging from 500 MPa to 2000 MPa resulted in acceptable stresses and deflections of the glazing structure. A submodel of a region of the glazing structure is created for a more realistic representation of the adhesive material. The geometry of the adhesive significantly affects the magnitude and distribution of stresses within the adhesive material, which the contact function underestimates. Stresses in the adhesive are compared to the strengths of an epoxy adhesive with similar elasticity, but stresses are close to the epoxy’s limits. It was also found that the curvature of the glazing structure plays a role in the deformations experienced by the adhesive bonds.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103834"},"PeriodicalIF":4.0,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864558","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":"Statistical characterization on slamming and green water impact onto a chemical tanker in extreme sea conditions","authors":"Shan Wang ,&nbsp;C. Guedes Soares","doi":"10.1016/j.marstruc.2025.103818","DOIUrl":"10.1016/j.marstruc.2025.103818","url":null,"abstract":"<div><div>Characteristics of slamming and green water impact onto a chemical tanker in extreme waves are investigated using statistical analysis based on the model test data. Three extreme wave sequences which contain single real-world waves, the New Year wave, Three sisters waves and Yura wave are considered. The temporal variation of the wave surface elevation generated in the tests, along with the measured heave, pitch motions, and vertical bending moments amidships, are compared and analysed in relation to the probability of exceedance for the maxima and minima. The Weibull and Generalized Extreme Value (GEV) models are used to fit the peaks. Slamming pressures on various locations are discussed by comparing the time signals and analysing the peaks using the analytical distribution models for the three extreme waves. The green water column height and associated loading on the deck are presented and compared as well. Discussions are also provided for the results of slamming and green water impacts for the ship with a medium forward speed in the New Year waves. Statistical values including the largest peak, the mean of 1/10th, and 1/3rd highest value of the identified peaks on the pressures are calculated. In addition to the temporal variation of the slamming pressures, the statistical values of the peaks on 32 locations (26 on the bow and 6 on the stern) are calculated, providing insights on both the time variations and the distributions of the pressures.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103818"},"PeriodicalIF":4.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864557","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":"The inversion investigation of wave slamming response of air cushion vehicle skirt airbags based on mode superposition method","authors":"Junhong Wei ,&nbsp;Shengjie Xu ,&nbsp;Yuchao Yuan ,&nbsp;Wenyong Tang","doi":"10.1016/j.marstruc.2025.103821","DOIUrl":"10.1016/j.marstruc.2025.103821","url":null,"abstract":"<div><div>Air cushion vehicle (ACV) skirt airbags frequently encounter direct wave slams, which involve large deformations and complex gas-liquid-solid three-phase coupling. The direct slamming energy will break diverse sensors, bringing huge difficulty to accurately monitor the dynamic response among slamming areas. To effectively derive the dynamic behavior of ACVs under wave slamming, this paper identifies the response of the limited monitoring points outside the slamming area, then inverses the skirt airbag slamming response based on modal superposition and the least squares method. Firstly, a 3D finite element model of the skirt airbag is developed. The control volume method is used to simulate the inflated-forming process, and the overall modes database of the airbag is obtained. Next, based on the load forms, modal characteristics, and response features, the monitoring point arrangement and fundamental modal selection are determined. Finally, the inversion algorithm is employed to update modal weight factors in real time then superposing them to predict the focused response in the slamming areas. The proposed inversion method is applied to different scenarios with both symmetrical and asymmetrical loads, to verify the stress response prediction accuracy. The error between the inverted response and the actual response remains almost within 10 %, and the inversion method shows good numerical stability. The inversion method is convenient to implement with a friendly computation time and provides valuable insights for the consequent investigation into the complicated dynamic behaviors of ACV flexible airbags under actual marine environments.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103821"},"PeriodicalIF":4.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858973","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":"Ultimate bearing capacity analysis of reinforced butt joints of large marine composite structures: Numerical optimization and experimental verification","authors":"Zishuo Wang ,&nbsp;Lifei Song ,&nbsp;Jiwei Huang ,&nbsp;Lin Xu ,&nbsp;Wei Shen ,&nbsp;Mengzhen Li ,&nbsp;Yaoyu Hu","doi":"10.1016/j.marstruc.2025.103814","DOIUrl":"10.1016/j.marstruc.2025.103814","url":null,"abstract":"<div><div>With the increasing use of composite materials in large ship structures, bonded joints have become a crucial component of hull connection structures. This paper investigates the ultimate load-bearing capacity and failure mechanisms of large adhesive joints in stiffened composite sandwich structures. Full-scale experiments and numerical simulations are conducted to analyze the ultimate strength, strain distribution, and displacement behavior of the joints under various loading conditions. An improved progressive damage analysis method, combined with a cohesive zone model, is proposed to accurately predict the failure process and load-bearing capacity of the bonded joints at each stage. The impact of key factors, such as the overlapping width and reinforcement thickness, on the structure's bearing capacity is quantitatively analyzed. The findings offer valuable insights for optimizing the design and improving the efficiency of large-scale composite adhesive joints in marine applications.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103814"},"PeriodicalIF":4.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864556","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":"Winkler springs for laterally loaded bucket foundations","authors":"Xinyi Huang,&nbsp;Rui He","doi":"10.1016/j.marstruc.2025.103830","DOIUrl":"10.1016/j.marstruc.2025.103830","url":null,"abstract":"<div><div>Bucket foundations are considered to be environmentally friendly foundations. Their stiffness determines the resonant frequencies and fatigue life of the supported offshore wind turbines. This study proposes a rigorous three-dimensional (3D) elastic solution for the stiffness of laterally loaded bucket foundations in different soil profiles. The lumped spring stiffness acting on the top of the bucket and the exact distribution of the distributed soil spring stiffness along the bucket are first obtained from the analytical model. Closed-form formulae for the lumped spring stiffness are then fitted and verified with the existing studies. To facilitate the engineering application, the distributed soil spring stiffness is then averaged to a uniform distribution using the equivalent work method. Two types of simplified Winkler models are finally proposed and calibrated: one in which the spring stiffness is uniformly distributed along the bucket, and the other in which the distributed Winkler springs are divided into two parts bounded by the centre of rotation. The non-dimensional Winkler springs are mainly related to the bucket aspect ratio, the soil Poisson's ratio and the loading height. It is shown that the lateral soil springs alone, as <span><math><mrow><mi>p</mi><mo>−</mo><mi>y</mi></mrow></math></span> springs for piles, are not sufficient for bucket foundations. The combined two-part <span><math><mrow><mi>p</mi><mo>−</mo><mi>y</mi></mrow></math></span> springs and uniform rotational springs are suggested to obtain accurate bucket foundation responses.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103830"},"PeriodicalIF":4.0,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855949","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":"Implementation of seismic soil-structure interaction in OpenFAST and application to an offshore wind turbine on jacket structure","authors":"Amir M. Kaynia ,&nbsp;Daniel Martens Pedersen ,&nbsp;Henrik Askheim ,&nbsp;Carlos Romero-Sánchez","doi":"10.1016/j.marstruc.2025.103832","DOIUrl":"10.1016/j.marstruc.2025.103832","url":null,"abstract":"<div><div>One of the challenges in design of offshore wind turbines (OWTs) is that the analyses are performed using specialized software dedicated to hydro-aero-servo-elasto-dynamic analyses which often cannot rigorously perform seismic soil-structure interaction (SSI) analyses. This work presents a methodology to extend these tools to include seismic SSI analyses in these tools with a specific application in the open source OWT analysis tool OpenFAST. The developed method is applied to 10 MW offshore wind turbine on a jacket structure founded on piles. The SSI is implemented using a multi-step sub-structuring method. The method is based on the SSI stiffness and kinematic interaction. The jacket base is attached to pile foundation springs, and excited by forces calculated from the pile-head motions during the earthquake. The spring stiffness and pile-head motions can be determined using well-established methods. In this, they are obtained using the finite element program Abaqus. A complementary integrated Abaqus model of the jacket and tower is then used to verify the implementation of the multi-step method in OpenFAST. The IEA 10 MW reference OWT established in the European research project INNWIND is used in the verification. Using the developed model, the study then attempts to investigate some of the characteristic earthquake responses of the OWT structure. Simulations show how the top of tower displacements are dominated by the wind-induced forces during production form the rotor-nacelle-assembly, while the tower top accelerations and base overturning moments are dominated by the earthquake-induced loads.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103832"},"PeriodicalIF":4.0,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847477","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":"Probabilistic analysis of the pipeline embedment in spatially variable clay","authors":"Fei Liu ,&nbsp;Po Cheng ,&nbsp;Jiang Tao Yi ,&nbsp;Chao Fan Liu ,&nbsp;Jun Hu ,&nbsp;Yu Zhou Sun ,&nbsp;Zhi Ming Jia","doi":"10.1016/j.marstruc.2025.103829","DOIUrl":"10.1016/j.marstruc.2025.103829","url":null,"abstract":"<div><div>Offshore pipelines are generally laid directly on the seabed without any additional stabilization measures. The pipeline embedment is an important factor that determines the resistance of soil in the axial and lateral movement of the pipeline during operation. Although natural soil properties show considerable spatial variability, the majority of existing studies on pipeline embedment are deterministic. This study shows a probabilistic analysis of the pipeline embedment in the randomness soil using three-dimensional large-deformation random finite-element calculations with the Monte Carlo framework. The results indicate that the randomness of soil strength not only affects the failure mechanisms during the pipeline penetration process but also alters the pipeline penetration resistance. The mean penetration resistance in the randomness soil is less than the deterministic value. Consequently, deterministic analysis may lead to a non-conservative solution without considering soil spatial variability. The required safety factor (<span><math><mrow><mi>S</mi><mi>F</mi></mrow></math></span>) is 2.0 to ensure that the failure probability (<span><math><mrow><mi>F</mi><mi>P</mi></mrow></math></span>) of the pipeline embedment is no &gt;0.1 %. Finally, a methodology is proposed for determining the <span><math><mrow><mi>S</mi><mi>F</mi></mrow></math></span> corresponding to different levels of <span><math><mrow><mi>F</mi><mi>P</mi></mrow></math></span> considering soil spatial variability. This is likely beneficial for engineers to evaluate the <span><math><mrow><mi>F</mi><mi>P</mi></mrow></math></span> for the deterministic design of the pipeline embedment according to the <span><math><mrow><mi>S</mi><mi>F</mi></mrow></math></span>.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103829"},"PeriodicalIF":4.0,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843775","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":"An analytical model for dynamic responses of one operating offshore wind turbine structure supported by bucket foundation","authors":"Yuchao Li ,&nbsp;Xiaofeng Dong ,&nbsp;Jijian Lian ,&nbsp;Xu Yang ,&nbsp;Zhuo Miao","doi":"10.1016/j.marstruc.2025.103831","DOIUrl":"10.1016/j.marstruc.2025.103831","url":null,"abstract":"<div><div>Recently, the bucket foundation has gained prominence in offshore wind farm (OWF) due to their superior bearing capacity and lower costs. However, higher towers and larger blades may pose significant vibration safety issues to offshore wind turbine (OWT) structures when OWFs continue developing towards deep-sea areas. It is increasingly crucial to accurately simulate the dynamic response of OWT supported by bucket foundation with the current challenges, including the need to corroborate finite element simulations with actual measurement data and the consideration of bucket-soil interaction and dynamic stiffness. In this research, a analytical model of dynamic responses for one operating OWT supported by bucket foundation was firstly established based on the multi-degree-of-freedom vibration theory. In response to the limitations of existing models, a novel bucket-soil interaction model was introduced considering the dynamic changes in foundation stiffness under external excitation and the influence of soil inside the bucket. The global model simulated wind loads, operational loads, and aerodynamic damping, and the Crayfish Optimization Algorithm (COA) was applied to correction formula of aerodynamic damping based on the measurement data. Furthermore, its accuracy was validated in both shutdown and operating modes by comparing the displacement and acceleration responses at the tower top. Finally, the structural responses were studied under extreme conditions such as earthquakes, wind, waves, and typhoons. It is concluded that the observed response growth trends of the tower-top displacement and acceleration of the established model are consistent with the actual trends observed in the prototype under the operating and shutdown conditions. In operating mode, the average deviations of the displacement and acceleration between the analytical model and the actual OWT structure are 7.18 % and 4.14 %, respectively. The model is suitable for OWT response analysis under seismic intensities below 0.3 g and typhoon of return period of 20 year. It is indicated that the proposed analysis model has good engineering application value for the vibration response simulation of actual OWT.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"103 ","pages":"Article 103831"},"PeriodicalIF":4.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833553","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}