Marine Structures最新文献_第5页

Methods for the local mechanical analysis of submarine power cables: A systematic literature review

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-19 DOI: 10.1016/j.marstruc.2024.103763

Pan Fang , Xiao Li , Xiaoli Jiang , Hans Hopman , Yong Bai

引用次数: 0

PSO-based design and optimization of jacket substructures for offshore wind turbines

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-18 DOI: 10.1016/j.marstruc.2024.103759

Borja Benítez-Suárez, Román Quevedo-Reina, Guillermo M. Álamo, Luis A. Padrón

{"title":"PSO-based design and optimization of jacket substructures for offshore wind turbines","authors":"Borja Benítez-Suárez, Román Quevedo-Reina, Guillermo M. Álamo, Luis A. Padrón","doi":"10.1016/j.marstruc.2024.103759","DOIUrl":"10.1016/j.marstruc.2024.103759","url":null,"abstract":"<div><div>The search for more and better wind resources pushes offshore wind farms further into deeper waters, where jacket support structures become a competitive alternative to monopiles for bottom-fixed offshore wind turbines. In this context, this paper proposes a cost-effective methodology for the autonomous design that facilitates the generation of preliminary candidate designs of jacket substructures, reaching a level of detail suitable for the initial design phase. A Particle Swarm Optimization algorithm, with precomputed initial swarms, is used as a search and optimization tool. The proposed strategy is able to find candidate designs that satisfy, with a minimum use of material, a wide range of Ultimate Limit States, Fatigue Limit States and Geometrical Restrictions. It is shown that the use of a precomputed initial swarm generated taking into account a starting concept design of the structures with a low computational cost, instead of a standard random population, significantly improves the efficacy and efficiency of the algorithm. A reference case, based on the NREL-5MW wind turbine and its OC4 reference jacket support structure, is used for studying and illustrating the capabilities of the proposal.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"101 ","pages":"Article 103759"},"PeriodicalIF":4.0,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147709","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}

引用次数: 0

Ultimate strength of deck grillages recovered from a decommissioned warship

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-18 DOI: 10.1016/j.marstruc.2024.103764

Malcolm Smith , Ken Nahshon , Teresa Magoga , Radu Chiritoiu , Prahshanth Sivapalan

{"title":"Ultimate strength of deck grillages recovered from a decommissioned warship","authors":"Malcolm Smith , Ken Nahshon , Teresa Magoga , Radu Chiritoiu , Prahshanth Sivapalan","doi":"10.1016/j.marstruc.2024.103764","DOIUrl":"10.1016/j.marstruc.2024.103764","url":null,"abstract":"<div><div>Cyclic ultimate strength testing of four deck grillage structures recovered from a decommissioned naval destroyer was conducted at Naval Surface Warfare Center Carderock Division to explore the behavior of in-service ship structure and generate data for modeling and simulation comparisons. The test articles spanned 3 or 4 complete frame bays of the original structure and included features typical of ship construction such as non-uniform thickness and frame spacing, hatch openings, and weld seams. Prior to strength testing, thickness and shape measurements were conducted on all test specimens, including full LiDAR scanning, and material properties were measured from coupons recovered from each grillage. Measured ultimate strength, post-collapse strength, load-shortening response collapse mode and location are compared with nonlinear FEA and Smith's method predictions. Numerical assessments were performed in two modelling configurations: nominal configuration, using design scantlings and material properties; and the actual configuration, using all pre-test measured data. Nonlinear FEA predictions indicate interframe collapse modes in a central frame bay, consistent with the test results, although differences in the collapse location and collapse mode of individual stiffeners are observed. Prediction of ultimate and post-collapse strength is shown to be greatly improved in the actual configuration, in particular when using measured material properties. Agreement between predictions and measured ultimate strengths is good, and Smith's method strength predictions are found to be comparable to FEA predictions.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"101 ","pages":"Article 103764"},"PeriodicalIF":4.0,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146727","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}

引用次数: 0

Flow past two tandem cylinders with a slight misalignment angle between them

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-13 DOI: 10.1016/j.marstruc.2024.103762

Qin Zhang , Xinyu Wang , Ming Zhao , Tianyuan Wang

{"title":"Flow past two tandem cylinders with a slight misalignment angle between them","authors":"Qin Zhang , Xinyu Wang , Ming Zhao , Tianyuan Wang","doi":"10.1016/j.marstruc.2024.103762","DOIUrl":"10.1016/j.marstruc.2024.103762","url":null,"abstract":"<div><div>This paper investigates the flow past two tandem cylinders with a slight misalignment angle between them. Unlike previous studies of flow past two parallel cylinders, the two cylinders are not on a same plane as the downstream cylinder is rotated slightly along an axis that is in the flow direction. Simulations are conducted for a cylinder length equal to 100 diameters, Reynolds numbers of 100 and 500 and the gap ratios of 0.5, 1, 2 and 4. If <em>Re</em>=100 and the gap ratio is 0.5, 1 and 2, intermittent vortex dislocation occurs, but the location of vortex dislocation varies between 15 and 35 diameters from the midsection. At gap ratios of 1 and 2, another vortex dislocation always occurs at the midsection because there is not vortex shedding at this location. This vortex dislocation at the midsection was not observed at <em>Re</em>=500 because there is vortex shedding at this position. The sectional drag coefficients of the two cylinders are nearly the same as those of two parallel cylinders with the same staggered distance. The standard derivation of the sectional lift coefficients of two cylinders at a section near the cylinder centres is smaller than those of two parallel cylinders with the same staggered distance.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"101 ","pages":"Article 103762"},"PeriodicalIF":4.0,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147548","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}

引用次数: 0

Experimental study on vibration responses of flexible riser transporting spiral flow in deep sea mining: Part II - solid-liquid two-phase transportation

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-13 DOI: 10.1016/j.marstruc.2024.103757

Jiayu Zhang , Nian-Zhong Chen , Svein Sævik , Aichun Feng

{"title":"Experimental study on vibration responses of flexible riser transporting spiral flow in deep sea mining: Part II - solid-liquid two-phase transportation","authors":"Jiayu Zhang , Nian-Zhong Chen , Svein Sævik , Aichun Feng","doi":"10.1016/j.marstruc.2024.103757","DOIUrl":"10.1016/j.marstruc.2024.103757","url":null,"abstract":"<div><div>An experimental study is carried out to investigate the responses of flow-induced vibration (FIV) on a flexible riser within a large-scale particle mixing transport device utilized in deep-sea mining, in which both spiral and straight solid-liquid flows are examined. The three-dimensional displacement field of the flexible riser is measured using a non-contact optical measurement system in time domain. The influence of fluid dynamic effects on the FIV responses of the riser, including velocity of straight flow, circumferential velocity of spiral flow, average concentration of solid-liquid two-phase flow, and internal flow density waves are investigated. For the mode of straight flow transport, the presence of internal flow density wave leads to the variation of dynamic load inside the riser, manifesting as periodic, significantly large-amplitude flutter of the riser, and noticeable bending deformation of the riser. Conversely, the flow pattern of the spiral flow results in a relatively uniform distribution of dynamic pressure, suppressing riser bending deformation, reducing the pulsation effects induced by internal flow density fluctuations. It is observed in frequency domain analysis that the riser vibration system transporting spiral flow exhibits multiple vibration modes, with higher-order frequencies being dominated and strong nonlinear characteristics.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"101 ","pages":"Article 103757"},"PeriodicalIF":4.0,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147549","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}

引用次数: 0

Experimental investigation on mechanical behavior of damaged HMPE mooring ropes under service loads

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-12 DOI: 10.1016/j.marstruc.2024.103760

Yushun Lian , Zhenghu Pan , Jinhai Zheng , WenXing Chen , Solomon C. Yim

{"title":"Experimental investigation on mechanical behavior of damaged HMPE mooring ropes under service loads","authors":"Yushun Lian , Zhenghu Pan , Jinhai Zheng , WenXing Chen , Solomon C. Yim","doi":"10.1016/j.marstruc.2024.103760","DOIUrl":"10.1016/j.marstruc.2024.103760","url":null,"abstract":"<div><div>This paper investigates the residual strength and stiffness evolution characteristics of high-modulus polyethylene (HMPE) ropes used in seaweed farms service. In some cases, polypropylene (PE) ropes commonly used in seaweed farms are more prone to failure in severe marine conditions, and HMPE ropes may be a more suitable alternative. Normally, damages occur during the service life of ropes in marine environments, such as marine biofouling, corrosion and internal abrasion from fine sand infiltration into the strands. Early studies on the mechanical properties of aged ropes (due to field service) suggest that both the strength and stiffness may be affected. In addition, the damage patterns of artificially induced cutting may not faithfully replicate the damaged state of the ropes in field service marine environments. Hence, the residual strength and stiffness evolution of the aged ropes with damage induced under service loads is investigated by using experimental testing techniques of fiber ropes. Additionally, by analyzing the residual strength, as well as the static and dynamic stiffness of the new (i.e., intact) and aged HMPE ropes, the damage that occurred by artificial cutting is compared with the damage that occurred under service loads.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"101 ","pages":"Article 103760"},"PeriodicalIF":4.0,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147547","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}

引用次数: 0

Experimental and theoretical studies of particle damping for the suppression of vortex-induced vibrations in different branches

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-12 DOI: 10.1016/j.marstruc.2024.103756

Wenchi Ni , Wenzha Yang , Xu Zhang , Yuan Du , Cheng Zhang , Yong Ma , Liangbin Xu , Gengqing Tian , Lina Yi , Zhuang Kang

{"title":"Experimental and theoretical studies of particle damping for the suppression of vortex-induced vibrations in different branches","authors":"Wenchi Ni , Wenzha Yang , Xu Zhang , Yuan Du , Cheng Zhang , Yong Ma , Liangbin Xu , Gengqing Tian , Lina Yi , Zhuang Kang","doi":"10.1016/j.marstruc.2024.103756","DOIUrl":"10.1016/j.marstruc.2024.103756","url":null,"abstract":"<div><div>Although particle damping has proven to be an effective passive vibration control technique widely applied across a variety of industries, research on its effectiveness and mechanism for suppressing vortex-induced vibrations (VIV) in marine structures remains unclear. This paper investigates the effects of particle dampers on VIV in different branches of a cylinder, determining rules and mechanisms of vibration suppression through a combination of experimental and theoretical analysis methods. Key conclusions drawn from our study include: 1. Optimal filling ratios vary for different VIV branches, with the highest overall VIV suppression effect at a filling rate of approximately 85 %, resulting in amplitude suppression ratios of 30 %-40 %. 2. Particle dampers exhibit an amplitude modulation effect on VIV, with the ability to excite a vibration mode that has the same frequency as the vortex shedding frequency of stationary cylinders. Furthermore, a parameterized study of particle damping systems is conducted in this paper, based on experimental results and theoretical models. Our findings demonstrate the feasibility of applying particle damping to suppress VIV in marine engineering structures, providing valuable reference for selecting optimal parameters of particle dampers.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"101 ","pages":"Article 103756"},"PeriodicalIF":4.0,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147681","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}

引用次数: 0

Hydroelastic analysis of VLFS integrated with porous floating box breakwater using multi-domain boundary element method

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-09 DOI: 10.1016/j.marstruc.2024.103747

S. Hemanth, D. Karmakar

{"title":"Hydroelastic analysis of VLFS integrated with porous floating box breakwater using multi-domain boundary element method","authors":"S. Hemanth, D. Karmakar","doi":"10.1016/j.marstruc.2024.103747","DOIUrl":"10.1016/j.marstruc.2024.103747","url":null,"abstract":"<div><div>The present study analyses the feasibility of integrating a Very Large Floating Structure (VLFS) with a porous floating box-type breakwater kept fixed in its position to analyze the hydroelastic responses within the integrated system based on linearized wave theory. The integrated VLFS-breakwater system, comprising the VLFS and the porous box-type breakwater assures in mitigating the structural effects induced by waves. The coupled Multi-Domain Boundary Element Method (MDBEM) and Finite Difference Method (FDM) are employed to investigate the performance of integrated VLFS-breakwater system. The computational framework employs the MDBEM to model the fluid domain and the floating breakwaters, while the VLFS is modeled using the FDM approach. The study considers three distinct relative positions of the VLFS integrated with a floating breakwater on (i) the leeside, (ii) the seaside, and (iii) on both leeside and seaside of the VLFS. The numerical study is performed based on thin-plate theory and small amplitude wave theory. The study corroborates its numerical findings with existing literature, supporting the validity of its methodology. The integrated system effectively reduces forces acting on the VLFS by absorbing the primary impact of waves. Consequently, the hydroelastic response of the VLFS is reduced, preserving its structural integrity and enhancing overall safety. The study signifies the importance of integrating the porous box-type breakwater with the VLFS. The importance of the orientation of the structure towards the sea waves, the porosity of the breakwater, the effect of relative spacing between the breakwater and VLFS and variations in hydrodynamic responses with respect to the placement of the floating breakwater are thoroughly discussed. The study performed will be helpful in the design and implementation of integrated VLFS-breakwater system, enhancing their robustness and safety in maritime environments.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"101 ","pages":"Article 103747"},"PeriodicalIF":4.0,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147680","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}

引用次数: 0

Springing responses of ships with forward speed based on a multi-module hydroelastic method

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-07 DOI: 10.1016/j.marstruc.2024.103733

Shiyuan Zhang , Shixiao Fu , Zhiyuan Pan , Kaijia Han , Yusong Ye

{"title":"Springing responses of ships with forward speed based on a multi-module hydroelastic method","authors":"Shiyuan Zhang , Shixiao Fu , Zhiyuan Pan , Kaijia Han , Yusong Ye","doi":"10.1016/j.marstruc.2024.103733","DOIUrl":"10.1016/j.marstruc.2024.103733","url":null,"abstract":"<div><div>A hydroelastic analysis method for flexible ships with forward speed is developed based on the beam-connected-discrete-modules (BCDM) approach. In this method, the flexible ship is first discretized into multiple rigid modules connected by a hull girder, thereby establishing the hydroelastic analysis model. The time-domain Rankine source method, which incorporates steady flow through the double body flow model, is employed to calculate the hydrodynamic forces acting on the multi-module system. The subsequent application of Fourier transformation facilitates the conversion of these forces into the frequency domain, where they are coupled with the structural stiffness of the hull girder to formulate the hydroelastic equations for advancing ships. Additionally, the time-domain hydroelastic equation is derived based on Cummins’ equation. The validity of the proposed method is conducted by comparing the zero-speed hydroelastic responses and the motions of advancing ships with the published data and numerical results from commercial software. Furthermore, the global responses of both flexible and rigid ships under varying forward speed conditions are thoroughly investigated. The results demonstrate that the flexible deformation plays a crucial role in the global responses of advancing ships, and hydrodynamic forces associated with forward speed have significant contribution to the hydroelastic responses.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"101 ","pages":"Article 103733"},"PeriodicalIF":4.0,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147662","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}

引用次数: 0

Corrigendum to “Non-linear dynamic behavior of T0 and T90 mesopelagic trawls based on the Hilbert–Huang transform” [Marine Structures, Volume 100, 15 March 2025, 103727]

IF 4 2区工程技术

Marine Structures Pub Date : 2024-12-04 DOI: 10.1016/j.marstruc.2024.103741

Bruno Thierry Nyatchouba Nsangue , Hao Tang , Ruben Mouangue , Wei Liu , Achille Njomoue Pandong , Liuxiong Xu , Fuxiang Hu , Leopold Tcham

引用次数: 0