Готові списки джерел за темами / Mooring design

Добірка наукової літератури з теми "Mooring design"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Mooring design"

1

Peters, Donald B., John N. Kemp, and Albert J. Plueddemann. "Coastal Surface Mooring Developments for the Ocean Observatories Initiative (OOI)." Marine Technology Society Journal 56, no. 6 (December 15, 2022): 70–74. http://dx.doi.org/10.4031/mtsj.56.6.2.

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Abstract Multiple mooring components have been developed at Woods Hole Oceanographic Institution (WHOI) that represent significant advancements in mooring technology. The Ocean Observatories Initiative (OOI) Coastal Surface Moorings are a unique coalescence of these elements into a robust and capable electromechanical mooring design. This paper describes innovative design elements in three key areas that are used operationally on OOI moorings: (1) components at the interface between buoy base and mooring riser, (2) electro-mechanical mooring riser components, and (3) an integrated seafloor anchor and instrument frame. These elements work together as a system that not only provides the necessary mechanical integrity for the mooring, but also provides mounting points for instrumentation and a reliable electrical pathway from the surface to the seafloor.
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2

Wood, S. L., and R. A. Skop. "Architecture of an Expert System for Oceanographic Mooring Design." Journal of Offshore Mechanics and Arctic Engineering 111, no. 2 (May 1, 1989): 138–43. http://dx.doi.org/10.1115/1.3257087.

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Анотація:
Methods for the design and analysis of oceanographic moorings are well established (Berteaux, 1976). However, as with most engineering design problems, there are certain “rules-of-thumb” or “tricks-of-the-trade” that streamline the design process and enhance the performance of the final product. These rules-of-thumb are normally known to only a small cadre of people—experts—who have deep involvement and experience in the particular engineering design problem. These rules-of-thumb and other knowledge of several experts are incorporated to develop the fundamental architecture of an expert system for the design of single-point, subsurface, oceanographic moorings. Such moorings are used worldwide to collect oceanographic and acoustic data. The projected end user of this expert system is the oceanographer or acoustician who wishes to design and/or cost out a mooring but has not the access to or support for a mooring design group.
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3

De Robertis, Alex, Robert Levine, and Christopher D. Wilson. "Can a bottom-moored echo sounder array provide a survey-comparable index of abundance?" Canadian Journal of Fisheries and Aquatic Sciences 75, no. 4 (April 2018): 629–40. http://dx.doi.org/10.1139/cjfas-2017-0013.

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A small number of stationary echo sounders have the potential to produce abundance indices where fish repeatedly occupy localized areas (e.g., spawning grounds). To investigate this possibility, we deployed three trawl-resistant moorings with a newly designed autonomous echo sounder for ∼85 days during the walleye pollock (Gadus chalcogrammus) spawning season in Shelikof Strait, Alaska. Backscatter observed from the moorings was highly correlated with ship-based acoustic surveys, suggesting that the mooring observations reflect abundance over much larger areas than the observation volume of the acoustic beam. A retrospective analysis of a 19-year time series of prespawning walleye pollock surveys was used to select mooring locations and determine that three to five moorings can produce an index of walleye pollock backscatter comparable to that produced by a ship-based survey covering ∼18 000 km2 (mean prediction error of <11% for five moorings). The three moorings deployed in Shelikof Strait yielded a backscatter estimate that was within ∼15%–20% of that observed during the survey. Thus, it appears feasible to design a relatively sparse mooring array to provide abundance information and other aspects of fish behavior in this environment.
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4

Kwan, C. T. "Design Practice for Mooring of Floating Production Systems." Marine Technology and SNAME News 28, no. 01 (January 1, 1991): 30–38. http://dx.doi.org/10.5957/mt1.1991.28.1.30.

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Анотація:
A draft "API Recommended Practice for Design, Analysis, and Maintenance of Mooring for Floating Production Systems" was developed recently by the API Task Group on Mooring Design for Floating Structures. This document is closely related to API RP-2P, "Recommended Practice for the Analysis of Spread Mooring Systems for Floating Drilling Units." because both documents address mooring of floating units. However, this document is also different in many ways from API RP-2P because there are significant differences between a floating drilling mooring system and a floating production mooring system. Major differences of this document from API RP-2P are:The design environment is significantly more severe.Dynamic instead of quasistatic mooring analysis is recommended; tension limits are relaxed.Guidelines for thruster-assisted mooring are included.Fatigue analysis is required. In the course of developing the Draft RP, the API Task Group has done some fundamental work to establish a rational design practice for FPS mooring systems. This paper highlights the new design practice, presents its basis, and points out areas where future work is needed.
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Kery, Sean. "Dynamic Modeling of Ship-to-Ship and Ship-to-Pier Mooring Performance." Marine Technology Society Journal 52, no. 5 (September 1, 2018): 87–93. http://dx.doi.org/10.4031/mtsj.52.5.10.

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AbstractTraditional methods for the design of ship-to-pier moorings in normal and storm conditions and for ship-to-ship moorings under normal conditions are currently based on static calculations. These calculations have served well for many years, first with natural fiber ropes and later with nylon and other low- to medium-modulus synthetics. Key to the success of this simplistic approach is lines that can elongate enough under tension to share the loads between multiple lines. When wire rope mooring lines are introduced, an increased weight catenary and the use of constant tension winches allowed enough compliance for the moorings to load share successfully.Now, we have very lightweight, high-modulus synthetic lines like High Modulus Polyethylene (HMPE), Aramid, and Liquid Crystal Polymer (LCP), where there is almost no stretch and very little weight to form a weight catenary. When used with constant tension winches that allow the mooring load to be shared across multiple lines, these can work well. However, when they are used from bollard to chock to bit with no compliance, they are unable to share the load between multiple lines, and high tension failures occur where a weaker but more compliant mooring line would be fine.This article describes advanced dynamic modeling of ships loaded by wind, waves, and currents in these conditions and the tension sharing between mooring lines of different materials and constructions. The need to share the mooring load between multiple lines is the crux of the issue.
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6

Boo, Sung Youn, and Steffen Allan Shelley. "Design and Analysis of a Mooring Buoy for a Floating Arrayed WEC Platform." Processes 9, no. 8 (August 10, 2021): 1390. http://dx.doi.org/10.3390/pr9081390.

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This paper presents the design and analysis of a mooring buoy and its mooring systems to moor a floating platform mounting an arrayed Wave Energy Converters (WECs). The mooring buoy allows the WEC platform to weathervane around the mooring buoy freely by the prevailing environment directions, which enables consistent power generation. The WEC platform is connected to the buoy with synthetic hawsers, while station-keeping of the buoy is maintained with catenary mooring lines of chains tied to the buoy keel. The buoy also accommodates a power cable to transfer the electricity from the WEC platform to the shore. The WEC platform is designed to produce a total of 1.0 MW with multiple WECs installed in an array. Fully coupled time-domain analyses are conducted under the site sea states, including extreme 50 y and survival 100 y conditions. The buoy motions, mooring tensions and other design parameters are evaluated. Strength and fatigue designs of the mooring systems are validated with requirements according to industry standards. Global and local structural designs of the mooring buoy are carried out and confirm the design compliances.
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Nielsen, Kim, and Jonas Thomsen. "KNSwing—On the Mooring Loads of a Ship-Like Wave Energy Converter." Journal of Marine Science and Engineering 7, no. 2 (February 1, 2019): 29. http://dx.doi.org/10.3390/jmse7020029.

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Анотація:
The critical function of keeping a floating Wave Energy Converter in position is done by a mooring system. Several WECs have been lost due to failed moorings, indicating that extreme loads, reliability and durability are very important aspects. An understanding of the interaction between the WEC’s motion in large waves and the maximum mooring loads can be gained by investigating the system at model scale supported by numerical models. This paper describes the testing of a novel attenuator WEC design called KNSwing. It is shaped like a ship facing the waves with its bow, which results in low mooring loads and small motions in most wave conditions when the structure is longer than the waves. The concept is tested using an experimental model at scale 1:80 in regular and irregular waves, moored using rubber bands to simulate synthetic moorings. The experimental results are compared to numerical simulations done using the OrcaFlex software. The experimental results show that the WEC and the mooring system survives well, even under extreme and breaking waves. The numerical model coefficient concerning the nonlinear drag term for the surge motion is validated using decay tests. The numerical results compare well to the experiments and, thereby, the numerical model can be further used to optimize the mooring system.
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Shi, Ji Wei, Hong Yuan Li, and Bing Zhen Li. "The Design of the Hawse Pipe and Intelligent Positioning." Advanced Materials Research 912-914 (April 2014): 824–28. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.824.

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The ship mooring system is an important installation for anchoring, the performance of ship mooring system affects the safety operation of the ship. Hawse pipe arrangement is the most important part of the ship mooring equipment layout design, the hawse pipe layout will directly affect the feasibility and convenience of ship mooring system in use. During traditional ship mooring equipment layout design, designers should firstly calculate the outfitting number, and inspect the specification manually to select mooring equipments, then design the hawse pipe layout with their experience by hand. In the previous ship mooring design work, the work efficiency is low. If ship line or general layout changes, designers need to re-check the mooring function and once mooring system can't meet the requirements, they need to re-design. This affects the overall design of the ship adversely. This paper is based on CAD platform, it researches the ship mooring system especially the hawse pipe intelligent layout design. Through using computer programs, drawing the hawse pipe section automatically and selecting optimal layout of the hawse pipe is achieved. This method improved the rationality of the design of the ship mooring system arrangement. This method can reduce the traditional burden of manually inspecting, and make the hawse pipe layout design more efficient.
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Pan, Qi, and Po Wen Cheng. "Cost-based mooring designs and a parametric study of bridles for a 15 MW spar-type floating offshore wind turbine." Journal of Physics: Conference Series 2265, no. 4 (May 1, 2022): 042013. http://dx.doi.org/10.1088/1742-6596/2265/4/042013.

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Abstract This paper highlights a cost-based design method for feasible and cost-effective mooring configurations. A parametric study of mooring designs considering bridle impact is performed for a 15 MW spar-type floating offshore wind turbine (FOWT). This site-specific FOWT is based on the preliminary model from EU funded H2020 Project COREWIND. Without running numerical simulations, the cost-based design method generates 1443 mooring configurations with normalized costs ranging from 1.00 to 1.667. Six configurations with the lowest normalized costs are selected for OpenFAST simulations. The ultimate test results verify the structural strength of mooring configurations. Bridle designs cause significant impact on the ultimate mooring tensions and floater motions in surge, sway and yaw, which is clearly influenced by the mass ratio of a bridle to a mooring line. When the mass ratio decreases from 13% to 5%, peak mooring tensions increase by up to 17%. The influence of bridle designs on mooring tension fatigue is less prominent and the effect of mass ratio on mooring fatigue varies with wind speed. Near the rated wind speed, deviations in mooring fatigue loads are within 5% for all six configurations. This cost-based method promotes feasible and economical mooring designs. The parametric study of bridle designs provides solid support for optimal mooring designs of spar-type FOWTs.
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Gözcü, Ozan, Stavros Kontos, and Henrik Bredmose. "Dynamics of two floating wind turbines with shared anchor and mooring lines." Journal of Physics: Conference Series 2265, no. 4 (May 1, 2022): 042026. http://dx.doi.org/10.1088/1742-6596/2265/4/042026.

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Abstract Floating wind farms present the opportunity to harvest wind resources located in deep water sites. Shared mooring designs can contribute in making floating wind energy more cost-competitive, and it is important to understand the new system dynamics that arise. We are presenting here HAWC2Farm, an extension of HAWC2 that can model multiple wind turbines with shared mooring lines. We apply the new modeling capabilities to simulate two 15 MW floating wind turbines on spar floaters with shared mooring lines. We consider two different sites and we identify and compare the natural frequencies and mode shapes of the shared mooring designs with those of an individual moored turbine. Furthermore, we investigate the influence of design parameters on the systems’ natural frequencies and we show that it is possible for a shared mooring design to achieve similar characteristics as a single turbine design. Finally, we test the response of the shared mooring design in steady wind and regular waves and find that the surge displacement of the upstream turbine and its mooring line loads are considerably larger compared to the single turbine case.
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Більше джерел

Дисертації з теми "Mooring design"

1

Briggs, Robert Clayton. "Mechanical Design of a Self-Mooring Autonomous Underwater Vehicle." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/36344.

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The Virginia Tech self-mooring autonomous underwater vehicle (AUV) is capable of mooring itself on the seafloor for extended periods of time. The AUV is intended to travel to a desired mooring location, moor itself on the seafloor, and then release the mooring and return to a desired egress location. The AUV is designed to be an inexpensive sensor platform. The AUV utilizes a false nose that doubles as an anchor. The anchor is neutrally buoyant when attached to the AUV nose. When the vehicle moors it releases the false nose, which floods the anchor making it heavy, sinking both the anchor and AUV to the seafloor. At the end of the mooring time the vehicle releases the anchor line and travels to the recovery location. A prototype vehicle was constructed from a small-scale platform known as the Virginia Tech 475 AUV and used to test the self-mooring concept. The final self-mooring AUV was then constructed to perform the entire long duration mission. The final vehicle was tested successfully for an abbreviated mission profile. This report covers the general design elements of the self-mooring AUV, the detailed design of both the prototype and final AUVs, and the results of successful field trials with both vehicles.
Master of Science
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2

Udoh, Ikpoto Enefiok. "Development of design tool for statically equivalent deepwater mooring systems." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3215.

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3

Hordvik, Tore. "Design analysis and optimisation of mooring system for floating wind turbines." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15571.

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Анотація:
Lately, focus is put on renewable energy resources as the environmental concerns regarding exploitation of hydrocarbons are increasing. The enormous energy potential found in offshore wind fields is proposed utilized by installing floating wind turbines in interconnected wind farms. As for all other floating structures operating within a limited area, stationkeeping is needed in order to keep the motions of the floating structure within permissible limits. In this study, methods for selecting and optimising the mooring system for floating wind turbines in shallow water are investigated. The design of the mooring system is checked against the governing rules and standards. Initially, the forces and moments associated with such structures are identified as the various terms in the equations of motions. Furthermore, the different mooring system concepts investigated in the study are described. They include distributed mass-, clump weight-, and buoyancy element mooring system. They are all based on the Hywind design with three distributed main mooring lines, each split into two delta-lines. Software programs suitable for analysing the system behaviour are recognized as SIMO, Riflex and TDHMILL3D. The analysis methods include quasi-static catenary analysis, eigenvalue analysis and decay analysis, in addition to integrated time domain analysis. The mooring system concepts are studied, and the clump weight mooring system is shown to be the preferred one with respect to limiting peak tensions in the mooring lines. The selected design concept is subjected to an optimisation procedure, where the main focus is to select mooring line segments with adequate breaking strength to sustain the maximum line tension with sufficient margins and to avoid vertical forces on the anchors. From parameter studies, the size of the clump weight is shown to be the most influential design parameter. Other parameters investigated include the position of the clump weight, pretension, overall length of the mooring system, chain and wire weight/dimension, vertical fairlead position and the delta-line length. Finally, the intact optimised mooring system is checked against the Ultimate limit state, while Accidental limit state control is performed for the mooring system in damaged condition. Both the cases of loss of line and loss of clump weight are investigated. The Troll field is selected as design location. For the Ultimate limit state, the criteria given in the standards are fulfilled for all directions. For the Accidental limit state, the mooring system design fails to meet the criteria given in the standards. Lack of redundancy is shown as this may cause loss of additional anchorlines.
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Wilson, Taylor Boyde. "Mechanical Design of a Trawl-Resistant Self-Mooring Autonomous Underwater Vehicle." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/64504.

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The Virginia Tech Trawl-Resistant Self-Mooring Autonomous Underwater Vehicle (TRSMAUV) is designed to reside on the seafloor for extended periods of time. The TRSMAUV shape allows for deployment in areas where trawl fisheries are conducted. TRSMAUV is a two stage vehicle. The ingress vehicle is the delivery device, and it is constructed from two symmetric halves. The top half contains the ingress vehicle propulsion system and control surfaces. The bottom half is the trawl-resistant mooring package. A smaller vehicle, the egress vehicle, is housed within the bottom ingress half and provides the guidance, navigation and control algorithms for the TRSMAUV. This report covers the general design elements of the TRSMAUV, the detail design of several prototypes, the results of the field trials, and the next steps that will be taken to build the final vehicle.
Master of Science
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FERREIRA, Fábio Martins Gonçalves. "Otimização de Sistema de Ancoragem equivalente em Profundidade Truncada." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17553.

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Ao esgotar as reservas de hidrocarbonetos em terra e águas rasas, a indústria vem explorando e produzindo petróleo em águas profundas e ultraprofundas. No entanto, a verificação hidrodinâmica de novos sistemas flutuantes de produção continua usando as metodologias consagradas, especialmente os ensaios em tanques oceânicos de laboratório. A utilização de modelos em escala reduzida vem sendo adotada desde os primeiros projetos em águas rasas e continua até hoje nos projetos em águas ultraprofundas. No entanto, os ensaios em profundidades superiores a 1.500m necessitam de um fator de escala muito elevado, com diversos problemas associados, dentre eles as dificuldades de acomodar as linhas de ancoragem e as incertezas relacionadas a modelos muito pequenos. Dentre as soluções possíveis, os ensaios híbridos (numérico-experimental) se apresentam como a solução mais viável para verificação experimental em águas ultraprofundas, em especial o ensaio híbrido passivo. Esse tipo de ensaio é organizado em etapas, sendo a primeira delas responsável pela definição do sistema truncado. Se essa etapa não for executada de forma satisfatória, o sucesso do ensaio pode ser comprometido. Assim, a fim de minimizar essa questão, propõe-se nesta tese de doutorado uma forma sistemática para encontrar sistemas truncado equivalentes, considerando os efeitos estáticos e dinâmicos, através da utilização de ferramentas de otimização. Nesse sentido, a abordagem adotada utiliza um simulador para análise estática e dinâmica de estruturas offshore denominado Dynasim e um algoritmo de otimização baseado em gradiente através do sistema Dakota. Também é utilizada a metodologia de planejamento de experimentos para identificar os fatores que influenciam as respostas estática e dinâmica do problema, evitando o uso de variáveis de projeto irrelevantes no estudo da otimização. Ressalta-se que essa metodologia não foi aplicada em outros trabalhos no contexto de sistemas de ancoragem truncado, segundo nosso conhecimento. Além disso, analisa-se o projeto ótimo do sistema truncado em várias condições ambientais, cujo interesse é verificar a concordância dele com o sistema de ancoragem na profundidade completa. Devido ao elevado custo computacional envolvido nessa verificação, utiliza-se a computação de alto desempenho, com processamento paralelo, para viabilizar a realização dessas análises. Como é demonstrado neste trabalho, a metodologia proposta facilita a busca de sistemas de ancoragem truncado equivalente preservando as características estáticas e dinâmicas do sistema de ancoragem completo. São apresentados e discutidos quatro casos, os dois primeiros se referem a casos simplificados, o terceiro é baseado na literatura e o quarto é baseado em um cenário real. Os resultados obtidos nos casos estudados mostram que os sistemas truncados equivalentes encontrados conseguem reproduzir o comportamento dos sistemas completos para as condições verificadas.
With the depletion of onshore and offshore shallow-water reserves, the industry has exploited and produced oil in deep water and ultra-deepwater. However, the hydrodynamic verification of new floating production systems continues using the established methodologies, especially by carrying out tests on ocean basin laboratories. Small-scale model tests have been used since the first projects in shallow water and continue today in the projects in ultra-deepwater. However, tests in depths above 1,500m require a very high scale factor, which poses several complications, among them the difficulties to accommodate the mooring lines and the small models related uncertainties. Among the possible solutions, the hybrid testing (numerical and experimental) are the most feasible solution to experimental verification in ultra-deepwater, especially the hybrid passive systems test. Such test is divided into steps, the first one responsible for the definition of the truncated system. If this step is not performed satisfactorily, the success of the test may be compromised. Thus, in order to minimize this issue, a systematic way to find equivalent truncated systems, considering the static and dynamic effects through the use of the optimization tools is proposed in this doctoral thesis. Accordingly, the approach adopted uses a numerical simulator, called Dynasim, for static and dynamic analysis of offshore structures, and a gradient based optimization algorithm, given in Dakota computational system. Additionally, the design of experiments methodology is used to identify the factors that influence the static and dynamic responses of the problem, avoiding the use of irrelevant design variables in the optimization process. It has to be emphasized that this methodology has not been used in other works in the context of truncated mooring systems, to our knowledge. Furthermore, the optimal design of the truncated system is analyzed for several environmental conditions. The aim is to verify the agreement of the truncated mooring system with system in the full-depth. Due to the high computational cost involved in the verification, we use the high-performance computing, with parallel computation, to perform the analyzes. As shown in this work, the proposed methodology easy the search for equivalent truncated mooring systems preserving the static and dynamic characteristics of full-depth mooring systems. Four case studies are presented and discussed. The first two refer to simplified cases; the third is based on the literature and the fourth is based on a real scenario. The results in each case show that the truncated equivalent system found can reproduce the behavior of full-depth system for the verified conditions.
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CARVALHO, LUCIANA GRETHER DE MELLO. "ABAYOMI: THE MOORINGS DESIGN FROM THE FEMININE THREAD COOPERATIVE ENSIGN." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8967@1.

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Анотація:
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
Esta dissertação aborda o design vernacular na confecção das bonecas negras de pano sem cola ou costura da Cooperativa Abayomi. Uma cooperativa do Rio de Janeiro, composta por mulheres que desenvolveu uma linguagem visual na criação das peças, baseada na fé e no poder das imagens, transformando as artesãs mestres de sua própria realidade. Cada boneca nasce envolvida numa história e sentimentos, caracterizando-se em padrões estabelecidos por princípios Abayomi na cor e na forma; na sugestão de movimentos e gestos, que a individualiza. Utilizando refugos da indústria têxtil e o mínimo de ferramentas em seu processo construtivo, as artesãs aproximam os meios de produção: matéria-prima, processo e produto final. A pesquisa foi desenvolvida a partir da convivência com Lena Martins, artesã fundadora da cooperativa, no movimento da Arte Abayomi, reconhecendo-se o universo material e a produção de sentidos no fazer do grupo. Este estudo é um relato de um design participativo no processo de tradução de linguagem visual de uma ilustração com personagens Abayomi e suas temáticas, desenvolvidas a partir da tradição oral, gestual e tridimensional da cooperativa, reforçadas perante as questões estéticas que a criação das peças suscitam.
This dissertation deals with the design vernacular of the Abayomi Cooperative black fabric dolls, which are created without any glue or stitches. The Abayomi Cooperative is from Rio de Janeiro; composed of women who designed a visual language in the dolls creation based on faith and power of images, wherein the artists are considered masters of their own craft. Each element used to build a doll has an important meaning for these women. The poses, colors and shapes reinforce what the doll is intended to express by the Abayomi as each one represents a unique story. The creative process excludes textile industrial elements, using a minimum of tools in the design process; therefore the artists approach the manner of production: raw material, process and product. This research was developed from the relationship with Lena Martins, cooperative artist founder, recognizing the Abayomi design, the general material wrought and the senses produced by the group perform. This essay is a participated design project report in the visual language translation, processed with illustration from Abayomi characters and their themes, the cooperative oral, gesture and three- dimensional traditions in face on esthetics matter those pieces make appear.
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Chen, Wen. "Uniaxial behaviour of suction caissons in soft deposits in deepwater." University of Western Australia. School of Civil and Resource Engineering, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0136.

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Suction caissons are a cost-effective alternative to traditional piles in deep to ultradeep waters. No design rule has been available on the axial capacity of suction caissons as part of the mooring system in soft sediments. In this research, a series of centrifuge tests were performed using instrumented model caissons, to investigate the axial capacity and radial stress changes around caissons during installation, consolidation and vertical pullout in normally consolidated, lightly overconsolidated and sensitive clays. Total pressure transducers instrumented on the caisson wall were calibrated for various conditions. The radial total stress acting on the external wall varied almost linearly during penetration and extraction of the caisson, with smaller gradients observed during post-consolidation pullout. Minimum difference was found in the penetration resistance and the radial total stress for caissons installed by jacking or by suction, suggesting that the mode of soil flow at the caisson tip is similar under these two types of installation. Observed soil heave showed that the soil particles at the caisson tip flow about evenly outside and inside the caisson during suction installation. Comparison was made between measurements and various theoretical predictions, on both the radial stress changes during caisson installation, and the radial effective stress after consolidation. Significant under-predictions on excess pore pressure changes, consolidation times and external shaft friction ratios were found for the NGI Method, based on the assumption that the caisson wall is accommodated entirely by inward motion of the clay during suction installation. Obvious over-predictions by the MTD approach were found in both stress changes and shaft capacity of the caissons. A simple form of cavity expansion method was found to give reasonable estimations of stress changes and post-consolidation external shaft friction. A model for predicting the penetration resistance of suction caissons in clay was evaluated. Upper and lower bound values of external shaft friction ratio during uplift loading after consolidation were derived. Uplift capacity of caissons under sustained loading and cyclic loading were investigated, revealing approximately 15 to 30% reduction of the capacity compared to that under monotonic loading. External shaft friction ratios and reverse end-bearing capacity factors were both found to be significantly lower than those under monotonic loading
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8

Mousavi, Mir Emad. "Reliability-based Design of Offshore Mooring Systems." Thesis, 2013. http://hdl.handle.net/1969.1/149292.

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This study proposes new methods for the reliability-based design of structural systems, with emphasis on offshore mooring systems. After a brief introduction to the mooring systems, two main objectives are discussed in this dissertation. The first objective is the calculation of the probability of failure of a structural system, which is an important input for a reliability-based design or any quantitative risk assessment. Two different methods are proposed for calculation of the probability of failure: a method based on the Monte Carlo simulations and a method based on the basic rules of probability, which is called the Progressive Reliability Method (PRM). Both methods are flexible to the definition of system failure. For example, the probability of a serviceability or ultimate-strength failure can be assessed using any of the two methods. It is shown that the two methods produce similar results, but PRM is preferred because it is exact and usually faster to implement. The second main objective in this dissertation is to develop a method for the optimization of the design of a structural system, given a target probability of failure. In this method, using the structural analysis of a preliminary design, the ratio of the optimal to the preliminary mean capacity of each component, which is called the Optimality Factor, is determined. Two design strategies are considered. First, an optimal design is intended to achieve the maximum system integrity. System integrity is defined as the balanced contribution of system components to its reliability. To quantify the system integrity, the Integrity Index is defined, and its calculation for various systems is discussed. Second, a designated failure scenario is considered, where some components serve as a fuse to protect some other components. This design strategy is especially applicable to mooring systems with drag anchor foundations because normally, if a drag anchor is pulled out from the seabed, it can cause significant damages to nearby subsea facilities. Using the rules of probability, a method is then developed to calculate the optimality factor of each component.
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9

Chang-Chien, Hung-Hsun, and 張簡宏勛. "Design and Analysis of Mooring System for Current Generator." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/50812157383280799779.

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Анотація:
碩士
國立臺灣大學
工程科學及海洋工程學研究所
97
For the exploitation of the huge ocean energy, development of Kuroshio current generator network system may be a chance for Taiwan. One of the biggest challenges of the ocean energy technology is how to moor the generators on the deep sea and resist the strong currents to keep them in right positions. This study explores different mooring systems for a pilot marine current power plant of 10MW located at 5km off shore. The feasibility of the design and construction of a mooring system for a current power generator of 1GW installed on a sea area of 25 square kilometers was considered. The design of the mooring system in this work contains two kinds of frame structures and a spherical-joint connected-pipe structure. The stress analysis for three designs were conducted to compare their advantages. The tension and the shape of the cable in the mooring system were analyzed to examine the mooring force of connected points and the floating condition of mooring structures.
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10

TE-KEN, WANG, and 王得根. "Mooring Systems Design and Deployment Technology Improvement on Data Buoy." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/61874797708635956629.

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Анотація:
碩士
國立高雄海洋科技大學
海洋環境工程研究所
99
Data buoy is the most common tool to observer ocean meteorology, as it has advantages of good reliability, durability, and no constraint on water depth. In addition, data buoy is the major key component in either oceanic environmental monitoring network or marine disaster predication system due to its abilities of all-weather, long-term continuous, and on-site monitoring, which make it impossible to be replaced by other marine monitoring alternatives. The objective of this study is to improve the buoy mooring design and deployment technology of data buoy according to water depth and location circumstances. The conventional COMC data buoy was designed for near coastal use. To be deployed in deep ocean and be operating functionally at such stringent environment, buoy body was modified and a new buoy mooring system was designed in this study to secure data buoy against severe sea conditions. Since the mooring system in coastal ocean is quite different from the one in deep ocean, the corresponding disparate deployment technologies were then discussed. A caisson-type floating vehicle, connected to data buoy and towed by a fishing boat, was developed to carry the heavy mooring system, including anchor and mooring chains, out into nearshore area. To deploy data buoy in deep water, the available operational vessels were evaluated and a step-by-step procedures was proposed. Finally, several typical drifting buoy cases were discussed and their consequent solutions were provided.
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Книги з теми "Mooring design"

1

Lawrence-Slavas, Noah. KEO mooring engineering analysis. Seattle, Wash: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Office of Oceanic and Atmospheric Research, Pacific Marine Environmental Laboratory, 2006.

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2

AWARE, Project. Mooring buoy planning guide. Rancho Santa Margarita, CA: International PADI, 1996.

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3

Greenslade, Erik. Design concepts for injury prevention among New Zealand waterfront workers. Wellington: IPSO, 1994.

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4

Takahashi, Hironao. NILIM-AIS ni yoru kontena bāsu e no chakugan rigan no tame no hakuchi kibo ni kansuru bunseki. Yokosuka-shi: Kokudo Gijutsu Seisaku Sōgoʹ Kenkyūjo, 2009.

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5

Design of marine facilities for the berthing, mooring, and repair of vessels. New York, NY: Van Nostrand Reinhold, 1990.

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6

International, Symposium on Deepwater Mooring Systems: Concepts Design Analysis and Materials. Deepwater mooring systems: Concepts, design, analysis, and materials : proceedings of the international symposium, October 2-3, 2003, Houston, Texas. Reston, VA: American Society of Civil Engineers, 2004.

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7

Paul, Walter. Design considerations for stretch conductors in oceanographic moorings. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1995.

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8

Paul, Walter. Hose elements for buoy moorings: Design, fabrication and mechanical properties. Woods Hole, Mass: WHOI, 2004.

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9

Gaudet, Laurel. Acoustics measurement buoy. [Durham, N.H.]: University of New Hampshire, New Hampshire Sea Grant, 2006.

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10

Hutto, Lara. CBLAST 2003 field work report. Woods Hole, MA: Woods Hole Oceanographic Institution, Upper Ocean Processes Group, 2005.

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Частини книг з теми "Mooring design"

1

Bergdahl, Lars. "Mooring Design for WECs." In Handbook of Ocean Wave Energy, 159–202. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39889-1_7.

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2

Wang, Hongwei. "Design of Mooring System." In Encyclopedia of Ocean Engineering, 1–6. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-6963-5_147-1.

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3

Wang, Hongwei. "Design of Mooring System." In Encyclopedia of Ocean Engineering, 314–19. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-10-6946-8_147.

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4

Gaythwaite, John W. "Mooring Loads and Design Principles." In Design of Marine Facilities, 235–311. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784414309.ch06.

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5

Liu, Yuliang, Zuoyu Zhou, and Xiaomin Shi. "Design of Visual Embedded Mooring Control System." In Lecture Notes in Electrical Engineering, 95–100. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4796-1_12.

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6

Hernandez, A., O. Altuzarra, V. Petuya, Ch Pinto, and E. Amezua. "A Robot for Welding Inspection in Offshore Mooring Chains." In Mechanism Design for Robotics, 406–12. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00365-4_48.

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7

Yttervik, R., G. Ersdal, and N. Oma. "On the safety of offshore mooring systems." In Advances in the Analysis and Design of Marine Structures, 773–79. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003399759-85.

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8

Wu, Bo, Xiaoming Cheng, Ying Chen, Xinyun Ni, and Kai Zhang. "Design Automation of Mooring Systems for Floating Structures." In Lecture Notes in Civil Engineering, 579–94. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4680-8_40.

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9

Shao, X., J. W. Ringsberg, H. D. Yao, Z. Li, and E. Johnson. "Fatigue of mooring lines in wave energy parks." In Advances in the Analysis and Design of Marine Structures, 205–11. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003399759-23.

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10

Shue, Alex, and Arthur Roesler. "Design of Drilled Shafts for Unusual High Mooring Forces." In Proceedings of GeoShanghai 2018 International Conference: Advances in Soil Dynamics and Foundation Engineering, 646–53. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0131-5_70.

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Тези доповідей конференцій з теми "Mooring design"

1

Garrett, D. L., J. F. Chappell, R. B. Gordon, and Y. Cao. "Integrated Design of Risers and Moorings." In International Symposium on Deepwater Mooring Systems. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40701(2003)21.

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2

Hu, Zheng. "Design of mooring system." In 2017 2nd International Conference on Machinery, Electronics and Control Simulation (MECS 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/mecs-17.2017.16.

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3

Okkenhaug, Siril, Ivar Fylling, Sverre Haver, and Tom Marthinsen. "The Effect of Weather Dependent Line Tension Optimization in Design." In International Symposium on Deepwater Mooring Systems. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40701(2003)19.

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4

Wang, Yi. "Design of Offshore Mooring System." In Advances in Materials, Machinery, Electrical Engineering (AMMEE 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/ammee-17.2017.73.

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5

Qin, ZhongBin, Kuntao Lai, and Qiuqun Zheng. "Mooring System Design Optimization Model." In 2017 16th International Symposium on Distributed Computing and Applications to Business, Engineering and Science (DCABES). IEEE, 2017. http://dx.doi.org/10.1109/dcabes.2017.52.

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6

Petruska, David, Jeff Geyer, Rick Macon, Michael Craig, Alex Ran, and Neil Schulz. "Polyster Mooring for the Mad Dog Spar - Design Issues and Othe Considerations." In International Symposium on Deepwater Mooring Systems. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40701(2003)8.

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7

Newlin, J. A. "Suction Anchor Piles for the Na Kika FDS Mooring System Part 1: Site Characterization and Design." In International Symposium on Deepwater Mooring Systems. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40701(2003)3.

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8

Okkenhaug, Siril, Jan Mathisen, and Torfinn Hørte. "NorMoor JIP: On Safe Mooring Line Design." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83827.

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DNV is currently running a Joint Industry Project, “NorMoor JIP”, on calibration of safety factors for mooring lines together with several oil companies, engineering companies, rig-owners, manufacturers of mooring line components and Norwegian authorities. Our motivation for initiating a study on mooring line safety factors started out with questions raised with regards to the safety level given by the Norwegian regulations. However, this is equally important for other mooring regulations like ISO, API and class-regulations. What we see is that the mooring standards are interpreted and applied in different ways. The reliability level implied by the regulations is not known, and the present safety factors were set when frequency domain analysis was prevalent while time domain analysis is often applied today. DNV carried out the DeepMoor JIP [9] during 1995–2000 using frequency domain analysis and reliability-based calibration. Now, a decade later, the increase in computing capacity makes it feasible to carry out a similar calibration for time-domain analysis of the mooring systems. The objective of the project work is to investigate and compare the characteristic line tension calculated according to design standards with the annual extreme value distribution of the line tension. Further, to calibrate safety factors for mooring line design for the ultimate limit state (ULS) as a function of the target probability of failure. The original proposal for this JIP included calculations for chain and wire rope moorings on a typical drill rig and a turret moored FPSO at three different water depths at Haltenbanken. However, since this JIP has been very well received in the industry, the scope has been extended to include calculations for a production semisubmersible, for fibre rope systems and for Gulf of Mexico environmental conditions. This paper will focus on the reasons for doing this calibration study, and the importance of seeking to agree on unified calculation recipes and requirements. Preliminary results for characteristic tension and annual extreme value distributions of tension for some designs are presented and discussed. The calibration of safety factors will be carried out later in the project when all designs are finalized.
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9

Hørte, Torfinn, Siril Okkenhaug, and Øivind Paulshus. "NorMoor JIP, Mooring Design Code Calibration." In Offshore Technology Conference. Offshore Technology Conference, 2017. http://dx.doi.org/10.4043/27773-ms.

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10

Liu, Yating. "The design of the mooring system." In 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/msmee-17.2017.145.

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Звіти організацій з теми "Mooring design"

1

Brefort, Dorian, and Diana L. Bull. Mooring Design for the Floating Oscillating Water Column Reference Model. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1323372.

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2

Bigorre, Sebastien P., and Raymond Graham. The Northwest Tropical Atlantic Station (NTAS): NTAS-20 Mooring Turnaround Cruise Report Cruise On Board RV Pisces November 4-28, 2021 Newport, RI - Pascagoula, MS. Woods Hole Oceanographic Institution, February 2023. http://dx.doi.org/10.1575/1912/29647.

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The Northwest Tropical Atlantic Station (NTAS) was established to address the need for accurate air-sea flux estimates and upper ocean measurements in a region with strong sea surface temperature anomalies and the likelihood of significant local air–sea interaction on interannual to decadal timescales. The approach is to maintain a surface mooring outfitted for meteorological and oceanographic measurements at a site near 15°N, 51°W by successive mooring turnarounds. These observations are used to investigate air–sea interaction processes related to climate variability. The NTAS Ocean Reference Station (ORS NTAS) is supported by the National Oceanic and Atmospheric Administration’s (NOAA) Global Ocean Monitoring and Observing (GOMO) Program (formerly Ocean Observing and Monitoring Division). This report documents recovery of the NTAS-19 mooring and deployment of the NTAS-20 mooring at the same site. Both moorings used Surlyn foam buoys as the surface element. These buoys were outfitted with two Air–Sea Interaction Meteorology (ASIMET) systems. Each system measures, records, and transmits via satellite the surface meteorological variables necessary to compute air–sea fluxes of heat, moisture and momentum. The upper 160 m of the mooring line were outfitted with oceanographic sensors for the measurement of temperature, salinity and velocity. The mooring turnaround was done by the Upper Ocean Processes Group of the Woods Hole Oceanographic Institution (WHOI), onboard R/V Pisces, Cruise PC-21-07. The cruise took place from November 4 to 28, 2021. The NTAS-20 mooring was deployed on November 12, and the NTAS-19 mooring was recovered on November 13. Limited inter-comparison between ship and buoys were performed on this cruise. This report describes these operations and the pre-cruise buoy preparations. Other operations during PC-21-07 consisted of one CTD cast near the Meridional Overturning Variability Experiment (MOVE) subsurface mooring array MOVE 1-14. MOVE is designed to monitor the integrated deep meridional flow in the tropical North Atlantic.
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3

Grosenbaugh, Mark A., and Spyros A. Mavrakos. Design of Oceanographic Surface Moorings for Harsh-Weather Environments. Fort Belvoir, VA: Defense Technical Information Center, January 1995. http://dx.doi.org/10.21236/ada330378.

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4

Paul, Walter. Hose Elements for Buoy Moorings: Design, Fabrication and Mechanical Properties. Fort Belvoir, VA: Defense Technical Information Center, July 2004. http://dx.doi.org/10.21236/ada428108.

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5

Seelig, William N. EMOOR" - A Planning/Preliminary Design Tool for Evaluating Ship Moorings at Piers and Wharves". Fort Belvoir, VA: Defense Technical Information Center, May 1998. http://dx.doi.org/10.21236/ada362383.

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