Готові списки джерел за темами / Keels Design and construction

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Добірка наукової літератури з теми "Keels Design and construction"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

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Статті в журналах з теми "Keels Design and construction"

1

Hasanudin, Jeng Horng Chen, I. Ketut Aria Pria Utama, and Haris Hendratmoko. "An Investigation into the Effect of Bilge Keels to the Roll Motion Response of Fishing Vessel." Applied Mechanics and Materials 862 (January 2017): 284–90. http://dx.doi.org/10.4028/www.scientific.net/amm.862.284.

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Анотація:
Stability of a ship is very influenced by ship’s roll motion, which is able to cause the ship to capsize. One of the main component which influence the roll motion, is the usage of motion damper at the ship’s hull. Bilge keel is a kind of passive damper whose construction is easy and does not require special system in the operation. The suitable bilge keel size is able to reduce excessive ship motion response when experiencing excitation force. This paper investigates the influence of bilge keel to the motion response of the ship by using a fishing vessel model with round bilge. The study was carried out by model experiment in the calm water and oblique wave using 6 types of bilge keel variation in its length and width. The results showed that the application of bilge keel is able to reduce about 37% motion response of the vessel; and the increase area of bilge keel also reduce the roll damping to 59%. It also can be concluded that common design bilge keel for merchant ship can be applied to the fishing vessel.
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2

Tier, L., M. Owen, and T. Sadler. "Practical Aspects of Canting Keel Design, Construction and Analysis." International Journal of Small Craft Technology 149, b2 (2007): 15. http://dx.doi.org/10.3940/rina.ijsct.2007.b2.6007.

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3

Yamamoto, Tomohiko, Atsushi Katoh, Yoshitaka Chikazawa, and Kazuo Negishi. "Design Evaluation Method of Steel-Plate Reinforced Concrete Structure Containment Vessel for Sodium-Cooled Fast Reactor." Journal of Disaster Research 7, no. 5 (October 1, 2012): 645–55. http://dx.doi.org/10.20965/jdr.2012.p0645.

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The Japan Sodium-Cooled Fast Reactor (JSFR) adopts the new concept of a containment vessel called a steel-plate-reinforced concrete containment vessel (SCCV). The SCCV is considered to be effective in shortening construction periods by the elimination of rebar work at a site compared with applying a reinforced concrete CV. In addition to this advantage, the SCCV achieves high-quality building structure because steel structural parts are fabricated at a factory prior to site construction. Although the SC structure has been used for buildings at a light-water reactor (LWR), etc., the SC structure has not yet been adopted for the CV. An SFR CV has a lower pressure environment than the LWR CV, although the environmental temperature of the SFR is much higher than that of the LWR in the postulated coolant leakage accident. It is therefore important to investigate its characteristics at high temperature to adopt the SC structure to the JSFR CV because the CV keeps containment functions in accidents to be assumed in design. This paper describes the construction of the design evaluation method from design (construction period shortening) and accident management, experimental, and analytical points of view.
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4

Wang, Hao, Quan Liu, Hongyang Zhang, Yinlong Jin, and Wenzhen Yu. "A Two-Stage Decision-Making Method Based on WebGIS for Bulk Material Transportation of Hydropower Construction." Energies 15, no. 5 (February 25, 2022): 1726. http://dx.doi.org/10.3390/en15051726.

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Bulk materials are necessary for hydropower construction. The bulk materials transportation (BMT) scheme is a guiding document for material supply, and its selection has a significant influence on hydropower construction. Since the BMT problem includes transportation planning and scheme selection issues simultaneously, only a small number of studies have focused on it. This paper presents a theoretical two-stage decision-making method (TDM), which innovatively combines the path optimization method and the multi-criteria decision-making (MCDM) method to solve the BMT problem. In the first stage, a multi-source path optimization model is established to optimize the transportation network and obtain a set of alternatives from each supply point to the construction site. In the second stage, considering the factors of economy, risk and construction progress, the MCDM method is adopted to select the optimal scheme from the alternatives. In addition, web crawler technology is used to obtain the transportation network data from the public WebGIS automatically. Case results show that the TDM can effectively solve this problem, and its result keeps consistent with engineering practice; with the help of the web crawler, it can reduce the design task time from months to days. Therefore, the TDM based on WebGIS can benefit hydropower construction design efficiency.
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5

Wen, Sen, and Qing Mei Kong. "Deformation Analysis on Deep Buried Tunnel of Weak Rock Mass Material with Material Properties under TBM Construction." Advanced Materials Research 675 (March 2013): 125–28. http://dx.doi.org/10.4028/www.scientific.net/amr.675.125.

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Deep buried tunnel of weak rock masses material is prone to generate large deformation; it’s easily trapped when TBM is used, so it’s important to predict the deformation in weak rock mass material. The method of orthogonal experimental design is adopted to design numerical experiment；Accordingly to the designed experiment, . FLAC3D is used to calculate and lots of data of deformation is derived. Percentage strain keeps the same when the diameter varies. Thorough analysis is carried out on derived data. The formulas of maximal strain in shied area, strain in tunnel face and supported area is regressed. The predictive value and test value have obvious linear relationship and it demonstrates that regressed formulas are credible.
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6

Guo, Ying. "Design of University Financial Information System Based on Data Mining Technology and IoT." Wireless Communications and Mobile Computing 2022 (August 22, 2022): 1–11. http://dx.doi.org/10.1155/2022/6830608.

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As China’s information construction level keeps getting better and higher education keeps getting better, new rules and regulations are being made and put into place. These new rules and regulations require colleges and universities to have comprehensive budget management, dynamic fund management, scientific forecast analysis and performance assessment, and the integration of campus cards and digital campuses. At present, the financial management concept and financial management software used by colleges and universities have been relatively lagging behind, which cannot adapt to the needs of current information and career development. Therefore, the financial information system of colleges and universities based on data mining technology is designed. The hardware part is designed with CORBA interceptor, B/S structure, and SQL converter. The software part first figures out what kind of financial information platform is needed. Then, using data mining technology, it builds a financial information model. Finally, it designs the functional module of financial information technology and builds the financial index system for colleges and universities. The results of the system tests show that the designed financial information system works well and has some use value.
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7

Qiu, Yu Liang, Xiao Xu Zhang, Bao Tong Shi, Rui Huang, and Qing Xia Zhang. "Checking Analysis of Lining Structural Strength in Aeolian Sand Tunnel." Advanced Materials Research 382 (November 2011): 307–11. http://dx.doi.org/10.4028/www.scientific.net/amr.382.307.

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Анотація:
The crushing and loosening arised from the characteristics such as single particle, bad gradation, lacking of self-stability, low cohesion, loose structure and shear strength happen frequently in the aeolian sand formation. These characteristics lead to tremendous difficulty for tunnel's design and construction. Loading such as formation pressure must be undertaken by secondary lining. In this paper, relying on Shen-Mu Tunnel of Yu-Shen expressway, the strength of lining section has been checked according to internal force combination through imitating the interaction of rock and lining by applying elastic resistance. The bearing force of secondary lining in aeolian sand tunnel has been discussed through calculation by ANSYS, which plays an important directive role on the construction process and keeps the project going on well.
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8

Sharafat, Abubakar, Muhammad Shoaib Khan, Kamran Latif, Waqas Arshad Tanoli, Wonyoung Park, and Jongwon Seo. "BIM-GIS-Based Integrated Framework for Underground Utility Management System for Earthwork Operations." Applied Sciences 11, no. 12 (June 20, 2021): 5721. http://dx.doi.org/10.3390/app11125721.

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Underground utilities are important assets that provide basic services for society’s daily life. They are generally very complex and remain unnoticed until they fail due to any particular reason. The stakeholders involved in the design, construction, and maintenance of utility infrastructure face many problems due to the traditional underground utility management system, resulting in injuries, loss of life, disruptions, project delays, and financial loss. The problem with the traditional system is that it uses 2D drawings and keeps unreliable information or a lack of updated information, which makes it an inefficient utility management system. With the advancement in construction information technology, we can address this effectively by integrating BIM and GIS. In this paper, a novel integrated BIM-GIS framework for underground utility management systems was developed on the basis of IFC to CityGML mapping. It provides an effective underground utility management system that facilitates designers in optimization of the design, assists in the excavator’s operator by providing real-time three-dimensional spatial information during the construction process, and acts as an as-built information database for utility facility management. For validation, a real-time project case study indicated that the proposed system can effectively provide comprehensive underground utility information at different project stages.
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9

Holton, Mark D., Rory P. Wilson, Jonas Teilmann, and Ursula Siebert. "Animal tag technology keeps coming of age: an engineering perspective." Philosophical Transactions of the Royal Society B: Biological Sciences 376, no. 1831 (June 28, 2021): 20200229. http://dx.doi.org/10.1098/rstb.2020.0229.

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Animal-borne tags (biologgers) have now become extremely sophisticated, recording data from multiple sensors at high frequencies for long periods and, as such, have become a powerful tool for behavioural ecologists and physiologists studying wild animals. But the design and implementation of these tags is not trivial because engineers have to maximize performance and ability to function under onerous conditions while minimizing tag mass and volume (footprint) to maximize the wellbeing of the animal carriers. We present some of the major issues faced by tag engineers and show how tag designers must accept compromises while maintaining systems that can answer the questions being posed. We also argue that basic understanding of engineering issues in tag design by biologists will help feedback to engineers to better tag construction but also reduce the likelihood that tag-deploying biologists will misunderstand their own results. Finally, we suggest that proper consideration of conventional technology together with new approaches will lead to further step changes in our understanding of wild-animal biology using smart tags. This article is part of the theme issue ‘Measuring physiology in free-living animals (Part II)’.
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10

Ding, Bo, Huan Qing Jiang, Hong Xia Wan, and Feng Zhang. "Lattice Light Steel Frame System and Application." Applied Mechanics and Materials 105-107 (September 2011): 1110–13. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.1110.

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Анотація:
Lattice light steel frame is a new type of structural system, combining general steel framework which is composed of lattice column and lattice beam with lattice light steel keel of the partitions and floors, the system takes full advantages of both structural systems, with high speed construction, less steel consumption, good earthquake-resistance etc., and possesses good prospects. The paper describes the system construction approach and the characteristics of lattice light steel frame system, and provides a project example of a villa. The design method and calculation model of the project are presented. Calculation results meet the specifications’ requirements, proving the new system can be applied to practical engineering. The paper gives guidance for application and research of this new system.
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Дисертації з теми "Keels Design and construction"

1

Westerhoff, Kevin M. (Kevin Matthew) 1978. "Construction based design." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/84827.

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2

Xie, Xiaoling. "Communications in construction design." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/7571.

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Construction design has become an increasingly complex synthesis activity for which effective solutions depend upon co-operative participation by a number of people. Thus communication, including the integration of specialised knowledge and negotiation of differences between team members, is a vital process for collaborative design. A questionnaire survey was initially conducted to investigate communication issues and problems, which had been highlighted from a review of the literature, in current construction design. The results confirmed that communication among the different construction team members is often difficult although of paramount important to design outcomes. Based on these results, case studies have been carried out to gain further insights into communication issues and problems, and explore why and how they are caused. Through the application of multiple approaches, a model has been developed, which suggests strategies that may help participants communicate more effectively and ultimately improve the quality of construction design outcomes.
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3

Soto, Leticia S. M. Massachusetts Institute of Technology. "Construction design as a process for flow : applying lean principles to construction design." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42995.

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Анотація:
Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2007.
Includes bibliographical references (p. 108-111).
Delays and cost overruns are the rule rather than the exception in the construction industry. Design changes due to lack of constructability late in the construction phase generating costly ripple effect which create delay and disruption throughout the entire organization, are the largest contributors to the stated rule. In the building construction industry, of increased competitiveness, demand from many companies continued effort to develop new methods and tools, in which the design for quality, cost, construability and reliability play an important role. The planning and management of building design has historically focused upon traditional methods of planning such as Critical Path Method (CPM). Little effort is made to understand the complexities of the design process; instead design managers focus on allocating work packages where the planned output is a set of deliverables. This current design method forces design teams to manage their work on a discipline basis, each working on achieving their deliverable as dictated by the design program with little regard of the relationship with other disciplines and organizations. In addition, because Architect and Engineering firms view design and construction as two separate independent phases of work in project it makes it difficult to verify constructability in a design and create flow in the overall process. The goal of this study is to look at how aligning interests, objectives and practices based on lean fundamentals, during the earliest stages of a project, as a method of improving construction performance.
by Leticia Soto.
S.M.
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4

Sebille, Michel. "Design :construction, automorphisms and colourings." Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211428.

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5

Chew, En Phin. "Superconducting Transformer Design and Construction." Thesis, University of Canterbury. Electrical and Computer Engineering, 2010. http://hdl.handle.net/10092/4977.

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This thesis first outlines the testing undertaken on a partial core superconducting transformer under open circuit, short circuit, full load and endurance test conditions. During the endurance test, a failure occurred after 1 minute and 35 seconds. During the failure, voltage dipping and rapid liquid nitrogen boil off was observed. This prompted a failure investigation which concluded that the lack of cooling in the windings was the most probable cause to the failure. Full core transformer and superconductor theories are then introduced. A copper winding transformer model, based on a Steinmetz equivalent circuit and a reverse design method, is described. A superconductor loss model which outlines the different types of losses experienced under AC conditions is used to determine the resistance of the windings in the Steinmetz equivalent circuit. This resistance changes with the magnitude of current and the strength of the magnetic field that is present in the gaps between each layer of the windings. An alternative leakage flux model is then presented, where the flux is modelled based on the combination of the reluctance of the core and the air surrounding the windings. Based on these theories, an iterative algorithm to calculate the resistance of the superconductor is developed. A new design of a 15kVA single phase full core superconducting transformer, operating in liquid nitrogen, is presented. The issues with building the superconducting transformer are outlined. First, a copper mockup of the superconducting transformer was designed where the mockup would have the same tape and winding dimensions as the superconducting transformer, which means the same core can be used for two different sets of windings. This led to designing a core that could be easily taken apart as well as reassembled. Construction of the core, the copper windings and the superconductor windings ensued. The process of cutting the core laminations, insulating the copper and superconductor tapes, and making the steel fasteners and terminations are described. The copper mockup and superconducting transformers was then tested under open circuit, short circuit, different load and endurance conditions at both liquid nitrogen and room temperatures. These test results were then compared with the those from two models. The comparison showed a significant inaccuracy in the reactances in the models. This introduced a correction factor into the superconductor model which ii made it more accurate. However, further work is required to explain and quantify the correction factors for the copper transformer model under different load conditions.
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6

Leung, Chi-ming. "Design consultancy vs design and build consultancy : present trends in the construction industry /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14038869.

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7

Ferguson, A. J. L. "Dilution refrigerator : Design, construction and performance." Thesis, University of Ulster, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378638.

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8

Batzer, Rachel E. (Rachel Elizabeth). "Design and construction of a dynamometer." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68827.

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Анотація:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
"June 2011." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 20).
Access to a dynamometer is a useful tool for any electrical system where the motors must be selected from various suppliers and fully characterized. Motor suppliers usually provide a torque, speed, efficiency curve, but it frequently lacks complete motor characterization and includes motor controller losses in the total system loss. The dynamometer presented in this thesis is primarily designed for testing of high efficiency motors and motor controllers in the power and speed range requires for competition in the World Solar Challenge, a transcontinental race for solar electric vehicles. The testing specifications of a solar electric vehicles are uncommon among motor testing needs because it requires high torque, low power, high efficiency, and the only a small operating range. This thesis covers the design and construction of the dynamometer.
by Rachel E. Batzer.
S.B.
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9

Bibby, Lee. "Improving design management techniques in construction." Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/793.

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Recent years has seen a significant drive away from traditional procurement routes with contractors finding themselves with an increasing responsibility for control of design - a process they have had little experience in managing. They now have to adapt accordingly. The learning curve is steep, not least because many projects must now be delivered fast track while co-ordinating increasingly complex fabric and content of buildings without a platform of accepted good practice to manage the design process. This is a major factor preventing the UK construction industry from delivering projects on time, to budget and to the specified quality. There is a need to educate an increasing number of people in design management techniques to equip them to manage today's fast moving and demanding projects. However, many current design management tools are insufficiently developed for industry application. Therefore, to improve design management in the industry, current techniques must be modified to align them with the needs of the modern design manager. This research has developed and tested a training initiative aimed at improving design management practice within a major UK Design and Construct Contractor. It comprises a Design Management Handbook, Design Management Training, Team Support and Project Monitoring. The Design Management Handbook is the core of the training initiative. It addresses critical aspects of design management practice and provides design management tools. Training provides guidance to project teams on the tools and practices. In Team Support project teams are supported in the implementation of the new practices and tools to help embed new ways of working in company practice. Project Monitoring establishes the impact of the new practices on project performance to demonstrate that they are working and thus reinforce change. To establish the training initiative's effectiveness and key findings, the impact of the initiative on design management performance has been explored. The research has established which practices and tools were used, which were not, as well as an understanding the applicability and performance of each Handbook practice and tool. From this, barriers to implementing new design management tools in industry were identified and strategies developed in order to overcome such barriers.
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10

Jeffries, James R. "Construction implications of photolithography equipment design /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Книги з теми "Keels Design and construction"

1

Bank, Gretchen G. Master builder: Bridges : [build your own models of the world's most famous structures] / by Gretchen G. Bank ; model illustration and paper engineering by Kees Moerbeek. San Diego, CA: Thunder Bay, 2008.

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2

Remiasz, Mile Victoria, ed. Hats, design & construction. 2nd ed. Evergreen Park, Ill: Hat Tree Studio, 1986.

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3

Costume construction. Englewood Cliffs, NJ: Prentice-Hall, 1989.

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4

Furniture by design: Design, construction & technique. New York: Lyons & Burford, 1997.

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5

European cabinetry: Design & construction. New York: Sterling, 1990.

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6

Ambrose, James E. Building construction and design. New York: Van Nostrand Reinhold, 1992.

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7

Dwight, John. Aluminium design and construction. London: E & FN Spon, 1999.

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8

Ambrose, James. Building construction and design. New York: Van Nostrand Reinhold, 1992.

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9

S, Lunde Anders, ed. Whirligigs: Design and construction. 2nd ed. Radnor, Pa: Chilton Book Co., 1986.

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10

Liddell, Louise A. Apparel: Design, textiles & construction. Frankfort, Ill: Goodheart-Willcox, 2012.

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Частини книг з теми "Keels Design and construction"

1

Maisel, Jordana L., Edward Steinfeld, Megan Basnak, Korydon Smith, and M. Beth Tauke. "Construction." In Inclusive Design, 97–124. New York : Routledge, 2017. | Series: PocketArchitecture : technical design series: Routledge, 2017. http://dx.doi.org/10.4324/9781315712437-4.

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2

Chappell, David. "Design." In Construction Contracts, 90–102. Fourth edition. | Abingdon, Oxon; New York: Routledge, 2021.: Routledge, 2020. http://dx.doi.org/10.1201/9781003080930-10.

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Chappell, David. "Design." In Construction Contracts, 90–102. Fourth edition. | Abingdon, Oxon; New York: Routledge, 2021.: Routledge, 2020. http://dx.doi.org/10.4324/9781003080930-10.

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4

Beadnall, Stuart, and Simon Moore. "Design risk." In Offshore Construction, 47–72. 2nd ed. London: Informa Law from Routledge, 2021. http://dx.doi.org/10.4324/9780367855574-3.

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5

Mosley, W. H., J. H. Bungey, and R. Hulse. "Composite construction." In Reinforced Concrete Design, 350–73. London: Macmillan Education UK, 1999. http://dx.doi.org/10.1007/978-1-349-14911-7_13.

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6

McLean, Will, and Pete Silver. "Construction Technology." In Environmental Design Sourcebook, 66–97. London: RIBA Publishing, 2021. http://dx.doi.org/10.4324/9781003189046-3.

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7

Houben, Hugo, and Hubert Guillard. "10. Design Guidelines." In Earth Construction, 244–303. Rugby, Warwickshire, United Kingdom: Practical Action Publishing, 1989. http://dx.doi.org/10.3362/9781780444826.010.

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8

Soutsos, Marios, and Peter Domone. "Concrete mix design." In Construction Materials, 249–58. Fifth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315164595-25.

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Dodd, Graham. "Design and applications." In Construction Materials, 453–58. Fifth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315164595-45.

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10

Delligatti, T. M. "Preparing for Construction." In Costume Design, 88–120. New York, NY : Routledge, 2021. | Series: The basics: Routledge, 2020. http://dx.doi.org/10.4324/9780429354304-5.

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Тези доповідей конференцій з теми "Keels Design and construction"

1

Jones, Brian A. "Design, Construction, and Performance of a 27' MORC Boat." In SNAME 12th Chesapeake Sailing Yacht Symposium. SNAME, 1995. http://dx.doi.org/10.5957/csys-1995-011.

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This paper describes the design, construction, and performance of the 27 foot sailboat "Problem Child". The design segment includes the reasons for undertaking such a project, the thought processes that shaped the boat, and the tools used to put the ideas on paper. The construction portion describes building the strongback, laying up the hull and attaching the keel, deck hardware and mast and the launching. A description of construction materials and processes is also included. Finally, an analysis of the performance, strengths and weaknesses and lessons learned provide feedback to assess the original design concept.
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2

Marko, J. R., and D. B. Fissel. "Marine Ice Profiling: Future Directions." In SNAME 7th International Conference and Exhibition on Performance of Ships and Structures in Ice. SNAME, 2006. http://dx.doi.org/10.5957/icetech-2006-166.

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Upward-looking sonars moored on the sea floor have contributed to our qualitative and quantitative understandings of ocean ice covers by enabling quasi-continuous measurements of ice draft along curvilinear tracks to accuracies as great as 0.05 m. The capabilities of ASL’s own IPS4 instrument to acquire and store such data has been demonstrated in well over 100 deployments in polar and sub-polar ice-infested regions. Data obtained from these deployments has providing ice property and characterization information for platform and operations design, planning, navigation support and for scientific ice and climate studies. Results obtained with recent use of the IPS4 and a sister instrument specialized to shallow water applications have motivated both the development of new deployment methodologies and suggested applications additional to simple ice draft measurements. Particular potential uses such as detecting unconsolidated ice content in lower portions of ice keels as well as the prevalence of loose and/or frazil ice under ice covers and in shallow water areas are discussed. Perceived future needs in both conventional draft profiling and in these and other new applications are used to guide developing requirements for a new generation of IPS instrumentation offering new performance capabilities and additional user-specific configurability. ASL’s vision of this instrumentation and progress toward prototype construction is described.
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King, Graeme, Ian Phiri, and John Greenslade. "Strain Based Design Versus Preheat for Hotbit Pipelines." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33289.

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The first buried hot bitumen (hotbit) pipeline is now operating successfully in the Alberta oil sands north of Fort McMurray and more are on the way. These hotbit pipelines are designed to transport raw, undiluted bitumen to a central refining plant at temperatures up to 140°C. They are constructed in winter when the ground is frozen allowing heavy construction equipment to travel across the watery muskeg terrain without sinking. Construction continues even when atmospheric temperatures fall as low as −30°C. Hotbit pipelines are buried with more than 1.2 m of cover, which can prevent them from expanding when they are heated from their locked-in installation temperature to their operating temperature of 140°C. Large longitudinal compressive stresses induced by this restrained thermal expansion combined with high hoop tensile stresses due to internal pressure produce stresses in the pipe wall that exceed the maximum allowable combined stress of 90%SMYS specified in North American pipeline codes (ASME B31.4 and CSA Z662). Two methods are available to handle these high combined stresses in hotbit pipelines. The first method is to expand the pipe during construction by preheating it to a temperature of approximately 90°C and then locking in the expansion by backfilling the pipeline trench before the pipe has had a chance to cool. By limiting the positive temperature differential between installation and operation to approximately 50°C, this method keeps thermally induced axial compressive stresses low enough that the combined stress does not exceed the allowable limit of 90%SMYS specified by pipeline codes. In the second method, the pipeline is still constructed in winter but without preheating. Temperature differentials and thermally induced axial compressive forces are much higher than in the first method and carefully engineered restraint is require to prevent the pipe from failing by pushing out of the ground at bends or by either lateral or upheaval buckling of long straight sections in muskeg swamps and bogs. This method requires strain-based design principles to show that, when the pipeline is first heated to its operating temperature, large thermally induced compressive stresses in the pipe wall are acceptable because they dissipate without causing failure when the pipe steel yields. Both methods are technically acceptable but require specialized pipeline engineering skills to implement them successfully. The first method incurs the cost of preheating and increased construction costs due to reduced pipe lay rates while the second method incurs the cost of more robust restraint systems, particularly at bends. Details of both methods are presented and discussed to determine which of the two methods has the least cost and the least risk.
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4

Mateus, Anto´nio F., Joel A. Witz, Paulo P. Silva, and Carlos A. Pereira. "On the Structural Design of Bilge Keels." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92513.

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The reduction of response motion experienced by monohull marine structures through energy dissipation performed by passive stabilisers such as bilge keels is an inexpensive system, when compared to the active motion reduction systems such as active stabilisers or active stabilising fluid tanks. This is the main reason why, despite the obvious advances in motion reduction and control, bilge keels are still designed, produced and fitted to the most recent ships and other marine structures produced. The design philosophy of passive roll stabilisers such as bilge keels has been, and still is, often based on empirical or design codes that define a standard structural arrangement, which is then sized in accordance with the specific characteristics of the vessel. This paper discusses the main internal structural arrangement configurations which may be adopted for bilge keel design, highlights the critical details which particular attention has to be paid to, presents the main steps involved in the sizing of the structural elements, and evaluates the more advantageous configurations with respect to performance vs. production cost. In what respects internal arrangement, the widest possible range of possibilities is considered, from the simple and fairly inefficient flat bar configuration, to the highly complex high performance diaphragm based designs. The advantages, disadvantages, estimated design and production efforts are presented and discussed. This work aims at providing a comprehensive review and a systematisation of the design principles applied for these structural components, envisaging to providing a simple and effective guide for the global and detailed design of their structures. Conclusions and further research work are drawn regarding the results obtained and the best solutions proposed.
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5

Jia, Hua, Fukun Liu, Jun Li, and Mao Wang. "Design of a Multijunction Antenna Unit for EAST Lower Hybrid Current Drive." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29795.

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A multijunction antenna unit has been designed and will be used to fabricate the new 4.6GHz Lower Hybrid Current Drive (LHCD) launcher for the long pulse operation of the Experimental Advanced Superconducting Tokamak (EAST). In this paper, the construction and design method of the multijunction antenna unit are described, and then the reflection coefficients of the unit with the matched load and with the plasma load are analyzed and discussed respectively by using High Frequency Structure Simulator (HFSS) code and by using numerical calculation based on linear coupling theory. The simulation result shows that the return loss of the antenna unit keeps below −25dB in a bandwidth of 100MHz and the power is distributed equally in the secondary waveguides of the unit. Numerical calculation result also shows that the unit has good coupling property in a wide range of tokamak plasma parameters.
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Kamijo, Haruto, and Tomohiro Tachi. "Serial Chain of Rigid Origami That Extends, Bends and Turns." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-67013.

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Abstract This paper presents a family of serial chain mechanisms with three degrees of freedom (DOF) by concatenating rigid origami modules. This chained mechanism forms a circular arc shape and can continuously extend, bend, and turn. The mechanism keeps three-DOF regardless of the number of connected modules, and the whole motion can be controlled by determining the configuration of one module at the end. We first describe the geometric construction of the mechanism and its implementation as a rigid origami fabricated from a flat sheet. We then analyze the kinematics of the system to illustrate the configuration space and how the shapes change by manipulating the input parameters. We also synthesize the motions by numerically solving inverse kinematics of the system. We also propose novel torus mechanism with two DOF.
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7

Hochkirch, Karsten, and Hartmut Brandt. "Fullscale Hydrodynamic Force Measurement on the Berlin Sailing Dynamometer." In SNAME 14th Chesapeake Sailing Yacht Symposium. SNAME, 1999. http://dx.doi.org/10.5957/csys-1999-003.

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At the Institute of Naval Architecture, Marine and Ocean Engineering (ISM), Technical University of Berlin, a research project was initiated investigating prediction methods for hydrodynamic forces acting on sailing yachts. For a 33ft. sailing yacht model tests with various keel designs and RANSE calculations have been carried out. In order to verify both, a full scale sail-force­dynamometer was built which enables to record the resulting hydrodynamic forces in a seaway without scaling parameters. In addition, separate six and five component balances have been designed for measuring the forces acting on keel and rudder for the model tests as well as on the full scale boat. The design and construction of the full scale measuring device is presented. Along with some sample measurements a general calibration procedure for inclined multicomponent balances is proposed. A short review of the model tests and RANSE-calculations complement the presentation.
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Liu, Fengwu, Shiyuan Li, Lijun Wang, Shunping Jing, Chao Liu, and Xiaoqing Li. "Optimization Configuration and Design Considerations of Spent Fuel Storage and Transport Casks for Nuclear Power Plants in China." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-92905.

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Abstract With the rapid development of nuclear power in China, the amount of spent fuel keeps increasing, which makes the demand for safe and suitable casks to store and transport spent fuel more prominent. Due to China’s national policy of “closed nuclear fuel cycle” and the uncertainties in the construction of reprocessing facilities, the configuration of spent fuel storage and transport cask has been directly related to the safety of nuclear power plants operation. Based on the demand of spent fuel storage and transport in China, this paper analyzes the requirement of different modes of storage and transportation and different loading contents for casks, such as 12ft / 14ft spent fuel loading, compatibility with short-term storage and transportation, and off-site transportation of dry storage canisters, etc. In order to ensure safety and control cost, this paper also analyzed the applicable standards, transport restrictions and optimization design objective for the optimal design of spent fuel storage and transport cask, and puts forward the optimal configuration and design method of the storage and transport cask based on the analysis of key concerns, which could provide reference for the configuration and design of spent fuel storage cask.
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9

Balze, Rémy, Hervé Devaux, and Louis Jézéquel. "Study of a Hydroelastic Instability Phenomenon: Flutter of Racing Yacht Keels." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82556.

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In the field of aeroelasticity, flutter is a well known instability phenomenon. Flutter is a synchronized vibration which takes place in a flexible structure moving through a fluid medium. It occurs when two regular, rhythmic motions coincide in such a way that one feeds the other, drawing additional energy from surrounding flow. A classic case of wing flutter might combine wing bending with either wing twisting. This article explores the flutter phenomenon in water. An important difference from the flutter phenomenon in air is the fact that the flexible structure is evolving in heavy fluid; this implies in particular added mass effects and important fluid damping. Flutter appeared for the first time on racing yacht keels with composite fins, so in water, in 2004: • On the IMOCA 60 feet boat POUJOULAT-ARMORLUX of Bernard STAMM during the transatlantic race ‘The Transat’: he lost his keel and capsized. • On the IMOCA 60 feet boat SILL Rolland JOURDAIN: the keel and the boat were saved. Following these problems — particularly following the loss of the keel of Bernard STAMM sailboat, accident that could have dramatic consequences for the skipper — HDS company focused on the phenomenon. Flutter has occurred only for canting keels with composite fins on IMOCA 60 feet and Volvo 70 feet racing yacht. The main questions asked are “Why are composite keels susceptible to flutter, and is it possible to predict and prevent this behaviour?”, then “Can a fair indication of the flutter critical speed of the keel be given at low cost?”. This presentation will introduce the strategy of HDS faced to the problem and the analytical and numerical methods implemented to estimate the flutter critical speed. Our model is based on a truncated modal basis for the most energetic modes which are generally, for a bulb keel, the lateral bending predominant mode and the torsion predominant mode. One of our requirements was to make a simple model in order to integrate the calculation of the flutter critical speed in the first design loops of a composite or steel keel. This model has worked well for the two cases of flutter appeared on IMOCA sailboat keels. Besides, to verify the quality of the model and to complete our analysis of flutter phenomenon on racing yacht keels, a 3 dimensional multi-physics simulation has been developed using the software ADINA.
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10

Esperanc¸a, Paulo T. T., Joel S. Sales, Stergios Liapis, Joa˜o Paulo J. Matsuura, and Wes Schott. "An Experimental Investigation of Roll Motions of an FPSO." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57765.

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FPSO roll motions can be major contributor to riser fatigue. This is especially true in regions where wind, waves and currents are non-collinear. Roll motions as high as 23 degrees have been reported in the Campos Basin. The most common roll mitigation strategy consists of adding bilge keels to the FPSO. Motivation for this work came from a need to develop a better understanding of roll motions as a function of bilge keel width. In addition to roll motions, the hydrodynamic forces on the bilge keels were measured. A series of tests were conducted at the LabOceano offshore basin. This new facility has a length of 4 0 m, a width of 30 m, a depth of 15 m and is equipped with a multi-flap wave generator on one side. A ship-shaped FPSO design with sponsons for a deepwater offshore development in Brazil was tested. It has a length of 316 m, a breadth of 57.2 m and a draft of 28.3 m. A 1:70 scale model was constructed. A horizontal soft mooring system consisting of four lines with springs was used. Regular waves of different amplitudes as well as random waves were generated in the basin. Two different loading conditions, ballast (draft = 6.7 m) and loaded (draft = 21.7 m), as well as three wave headings, beam seas (90°), and quartering seas (22.5°, 45°) were considered. Tests were undertaken for four bilge keel configurations, corresponding to a case without bilge keels, as well as bilge keels of 3 different widths (1 m, 2 m and 3 m). In all cases, the bilge keels had a length of 200 m. An optical system was used to measure ship motions in all six degrees of freedom. The hydrodynamic loads on the bilge keels were measured using strain gages.
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Звіти організацій з теми "Keels Design and construction"

1

CORPS OF ENGINEERS WASHINGTON DC. Construction: Design and Construction Evaluation (DCE). Fort Belvoir, VA: Defense Technical Information Center, February 1996. http://dx.doi.org/10.21236/ada404141.

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2

Slocum, Alexander H., Laura A. Demsetz, David H. Levy, and Bruce Schena. Design Methodology for Automated Construction Machines. Fort Belvoir, VA: Defense Technical Information Center, December 1987. http://dx.doi.org/10.21236/ada207386.

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3

Fanella, David A., Amaldo T. Derecho, and S. K. Ghosh. Design and construction of structural systems. Gaithersburg, MD: National Institute of Standards and Technology, 2005. http://dx.doi.org/10.6028/nist.ncstar.1-1av1.

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4

Collins, James J. Design and Construction of Genetic Applets. Fort Belvoir, VA: Defense Technical Information Center, May 2003. http://dx.doi.org/10.21236/ada417910.

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5

Jackson, J. G. Y-12 Sustainable Design Principles for Building Design and Construction. Office of Scientific and Technical Information (OSTI), November 2008. http://dx.doi.org/10.2172/969028.

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CORPS OF ENGINEERS WASHINGTON DC. Engineering and Design. Construction with Large Stone. Fort Belvoir, VA: Defense Technical Information Center, October 1990. http://dx.doi.org/10.21236/ada402849.

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7

McNeese, L. E. ORNL engineering design and construction reengineering report. Office of Scientific and Technical Information (OSTI), January 1998. http://dx.doi.org/10.2172/631227.

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Janet E.R. Mcllvaine, David Beal, and Philip Fairey. INTERIOR DUCT SYSTEM DESIGN, CONSTRUCTION, AND PERFORMANCE. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/823970.

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9

Schwartztrauber, K. Modular Design/Phased Construction Alternative Evaluation Report. Office of Scientific and Technical Information (OSTI), May 1999. http://dx.doi.org/10.2172/763136.

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10

Deschamps, Richard, Christopher Hynes, and Philippe Bourdeau. Embankment Widening Design Guidelines and Construction Procedures. West Lafayette, IN: Purdue University, 1999. http://dx.doi.org/10.5703/1288284313202.

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