Relevant bibliographies by topics / Underwater vessel design

Academic literature on the topic 'Underwater vessel design'

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Published: 10 March 2023

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Journal articles on the topic "Underwater vessel design"

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Frumen, А., and C. Mednikov. "Multihull underwater vessel: design challenges." Transactions of the Krylov State Research Centre S-I, no. 2 (December 28, 2020): 266–71. http://dx.doi.org/10.24937/2542-2324-2020-2-s-i-266-271.

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This paper discusses practicability of a large-diameter hull for an underwater vehicle as a totality of cylindrical shells with parallel axes forming a “global” cylinder (polyhull). Structural design is justified by analytical and numerical (FE) calculations of strength, structural stability and compression, with corresponding conclusions and recommendations.
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Gao, Feng, Jian Guo Zhang, and Fang Fang Yang. "Stress Analysis and Optimization Design of Pressure Vessel of Underwater Gamma Spectrometer." Applied Mechanics and Materials 518 (February 2014): 275–78. http://dx.doi.org/10.4028/www.scientific.net/amm.518.275.

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Pressure vessel makes the underwater gamma spectrometer can operation in underwater environment. In this paper, a kind of cylindrical pressure vessel has been simulated and analyzed using CAD software named Solidworks. Analysis results show the end covers are much thicker than the side wall to satisfy the same design safety factor and the centers of the end covers are the stress concentration areas. Further more, a 2× 2 LaBr3: Ce scintillation detector and a series of pressure vessels with various design safety factors and same inner space have been simulated by Monte Carlo code MCNP. Calculation indicates that the thicker the shell, the lower the detection efficiency. Further more, calculation shows the impact of the pressure vessel on detection efficiency of underwater gamma spectrometer varies with the photon energy. The law is that the higher the photon energy, the lower the influence on the detection efficiency.
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Li, Lin Na, Dong Wang Zhong, and Chao Zhang. "Engineering Design of Underwater Explosive Containment Vessels." Applied Mechanics and Materials 303-306 (February 2013): 2831–34. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2831.

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Underwater explosion vessel is the main equipment to experimentally study the law of underwater explosion by small quantity of explosive. It is the main equipment of explosive metalworking. In order to the safe using of underwater explosion container and the efficiency, we must accurately determine the strength of the container. Based on the actual engineering design, the brief summary about engineering design method of 10gTNT equivalent deep water explosion vessel has carried on.
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Chukwunazo Joseph, Ezeofor, and Georgewill Oyengiye Moses. "Prototype development of tethered underwater robot for underwater vessel anchor release." IAES International Journal of Robotics and Automation (IJRA) 9, no. 3 (September 1, 2020): 196. http://dx.doi.org/10.11591/ijra.v9i3.pp196-210.

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<p>Tethered underwater robot (TUR) for underwater vessel anchor release is presented. In off-shore oil and gas enviromnment, there has been series of reported cases on stuck vessel anchors after mooring operations and divers are sent to release these anchors for the vessels to be in motion. The use of divers to perform such function is very risky because of human limitation and some divers have been reported dead on the process due to high pressure underwater or being attacked by underwater wide animals. This has caused very serious panic to the vessel owners and hence, this work is aimed to develop TUR that would be used by the vessel operators instead of divers to release the stuck anchor without loss. The underwater robot system comprises of three basic sections namely graphical user control interface (GUCI) that would be installed in the operator’s laptop, the WiFi LAN router for network connection, and TUR system hardware and software. Each of these sections was strictly designed. Various high-level programming languages were employed to design the GUCI and code the interface buttons, robot controller program codes etc. The implementation carried out and the prototype system tested in the University of Port Harcourt’s swimming pool of 6m depth for validation. The robot performed extremely good in swimming and release of constructed anchor underwater.</p>
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Morrissey, George R., and Michael C. Stone. "Diving Support Vessel Concept Design." Marine Technology and SNAME News 34, no. 02 (April 1, 1997): 148–55. http://dx.doi.org/10.5957/mt1.1997.34.2.148.

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This paper describes the preliminary process for designing a 250 ft dynamically positioned, Diving Support Vessel. This is to serve the offshore oil industry as a platform for underwater intervention. Enlisting the use of the latest technological advances, the vessel will support both remotely operated vehicles and human divers. We will trace the development of this design with a well-defined agenda. Beginning with an analysis of the existing fleet, a practical hull form is created, which leads to solid estimations for hydrostatics, stability, resistance, powering and preliminary arrangements. We will also discuss the steps that will follow over the next several months.
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MacGillivray, Alexander O., Laurie M. Ainsworth, Joanna Zhao, Joshua N. Dolman, David E. Hannay, Héloïse Frouin-Mouy, Krista B. Trounce, and Derek A. White. "A functional regression analysis of vessel source level measurements from the Enhancing Cetacean Habitat and Observation (ECHO) database." Journal of the Acoustical Society of America 152, no. 3 (September 2022): 1547–63. http://dx.doi.org/10.1121/10.0013747.

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Measurements of the source levels of 9880 passes of 3188 different large commercial ships from the Enhancing Cetacean Habitat and Observation (ECHO) program database were used to investigate the dependencies of vessel underwater noise emissions on several vessel design parameters and operating conditions. Trends in the dataset were analyzed using functional regression analysis, which is an extension of standard regression analysis and represents a response variable (decidecade band source level) as a continuous function of a predictor variable (frequency). The statistical model was applied to source level data for six vessel categories: cruise ships, container ships, bulk carriers, tankers, tugs, and vehicle carriers. Depending on the frequency band and category, the functional regression model explained approximately 25%–50% of the variance in the ECHO dataset. The two main operational parameters, speed through water and actual draft, were the predictors most strongly correlated with source levels in all of the vessel categories. Vessel size (represented via length overall) was the design parameter with the strongest correlation to underwater radiated noise for three categories of vessels (bulkers, containers, and tankers). Other design parameters that were investigated (engine revolutions per minute, engine power, design speed, and vessel age) had weaker but nonetheless significant correlations with source levels.
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Ćorak, Maro, Zdenko Šperanda, Juvel Čokić, Marin Palaversa, and Joško Parunov. "Finite Element Simulations of Novel Submersible Design Based on the ASME Design-by-Analysis Approach." Journal of Marine Science and Engineering 11, no. 2 (January 25, 2023): 275. http://dx.doi.org/10.3390/jmse11020275.

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Tourist submersibles are a new class of underwater vehicles where new materials and innovative structural concepts are used. Because of the lack of experience with these innovative vessels, prescribed rules of classification societies are not directly applicable in their structural design. Thus, a novel design-by-analysis approach, as given in the Boiler and Pressure Vessel Code of ASME, is employed for dimensioning structural components. Design-by-analysis stands for a consistent set of loads, boundary conditions, modelling principles, failure modes, and safety factors if the finite element analysis is performed instead of using rule formulas. The approach has been used until now in the structural design and optimization of unconventional pressure vessels, while in this paper it is for the first time employed in structural design of the underwater vehicle. This study can serve as guidance for future applications of design-by-analysis in the development of the innovative structures exposed predominantly to the pressure loading.
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Li, Lin Na, Dong Wang Zhong, and Chao Zhang. "Design and Research on 1kgTNT Equivalent Explosion Vessel." Advanced Materials Research 655-657 (January 2013): 648–51. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.648.

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In order to the safe using of underwater explosion container and the efficiency, we must accurately determine the strength of the container. In the paper, researching on the design of 1kgTNT equivalent cylindrical explosion vessel it is indicate that strength calculation to explosion vessel using the dynamic coefficient method is accuracy. Experimental results also show that the security of the explosion vessel has reached the design requirements.
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Tang, Ting, Li Jun Wang, and Jin Bo Ma. "Optimal Design of Double Bottom Structure Filled with Liquid Resisting Underwater Explosion." Applied Mechanics and Materials 105-107 (September 2011): 907–11. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.907.

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Liquid filled double bottom structure is a usual type for large surface vessel, so the optimal design of which has important significance for viability of vessels in war. Appling a FEM process of MSC.Dytan, and changing the depth of liquid cabins, the thickness of bottoms and the thickness of stiffening, the response of different double bottom structures to underwater explosion were studied. After comparing and analyzing the deformation, the optimal design method of double bottom structures filled with liquid resisting underwater explosion was achieved. The best depth of water in water cabins is 90%, the best ratio of thickness of inner bottom and outer bottom is 11/9, and the stiffening should be thicker than outer bottom and thinner than inner bottom.
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Lerch, D. W. "An Application of Oil Spill Recovery Technology to Response Vessel Design—The Burrard Cleaner No. 9." Marine Technology and SNAME News 30, no. 03 (July 1, 1993): 172–77. http://dx.doi.org/10.5957/mt1.1993.30.3.172.

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Part 1 examines the fate of crude oil spilled at sea and develops the design philosophy for the response recovery vessel. Part 2 describes the model testing, design details and construction of a 75-foot tractor design, modern oil recovery vessel for open water and coastal operation. Part 3 reviews the underwater appendage design, the problems and solutions.
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Dissertations / Theses on the topic "Underwater vessel design"

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Maples, Allen B. "Design of a robust acoustic positioning system for an underwater nuclear reactor vessel inspection robot." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06232009-063217/.

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Yin-ChenHsieh and 謝尹甄. "The Preliminary Design of a Research Vessel for Nearshore Underwater Archaeology in Taiwan." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/07829955353187191103.

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碩士
國立成功大學
系統及船舶機電工程學系
104
This thesis depicts the design of the research vessel for nearshore underwater archaeology in Taiwan. According to the domestic experience of underwater cultural heritage, we plan to development and test the tool related to underwater archaeology in Taiwan that might be required in the near future. The thesis is focused on the survey of requirement and preliminary design of a research vessel for nearshore underwater archaeology in Taiwan. Owning to numerous details of design requirements and specifications are not clear for now, this preliminary design of a research vessel or nearshore underwater archaeology in Taiwan remains flexible depending on requirements of the ship owner and users. This thesis is only based on reasonable assumptions of design conditions for ship owner. In this study, we adopted semi-structured interview to consult with experts who are experienced in relative fields in order to collect their suggestions to practical requirements for designing research vessel for underwater archaeology in Taiwan. The interviewees included: underwater archaeologists, archaeological diving experts, professors experienced in underwater technology and marine investigation fields, and experienced naval architects. These opinions are integrated to the reference design conditions of the preliminary de-sign of a research vessel for nearshore underwater archaeology. Furthermore, we refer to environment of archaeological area and fishing harbors as reference of design requirements. Then based on general ship design process, we preliminarily design a research vessel for nearshore underwater archaeology. The contents include lines, body plan, general arrangement, ship hydrostatic calculations, resistance prediction, and the cost estimation of the research vessel. The study findings may serve as a reference for related institutes of cultural heritage who plan to build an exclusive research vessel for nearshore underwater archaeology in Taiwan. The research vessel is sufficient with working deck area and laboratory, and has a dynamic positioning system.
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Meschini, Alessia. "Design methods for unmanned marine vehicles." Doctoral thesis, 2020. http://hdl.handle.net/2158/1183797.

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Marine robotics is increasingly adopted in many fields of the underwater world, however, as of today, can still be considered a challenging task. In this framework, the research activity carried out during the PhD period concentrated on the study of hull ways of failure, with special focus given to cylindrical and dome shape, and on the development of an autonomous self-moving buoy for underwater target localization and communication. Starting from the current solutions identified within the state-of-the-art, the work was conducted heading to create a simplified calculation system for the design and sizing of submarine hull parts under pressure and, in particular, to codify a fast and light computational procedure to check the resistance of cylinders and domes. The investigated underwater vehicle, i.e. the here presented case study, named FeelHippo, was designed and assembled by the Department of Industrial Engineering of the University of Florence. Its main hull is composed of an extruded PolyMethyl Methacrylate cylinder and two thermoformed domes, which for the productive process have peculiar geometrical features. First, the theoretical critical buckling pressure of the cylinder was calculated using classical formulas; second, the critical buckling pressure was analytically derived and used to determine the optimized size in order to calculate the lowest thickness of the vehicle central cylinder to address the buckling effect. The available domes were experimentally tested until breakage, and then the dome design pressures were obtained, introducing additional correlations to consider the thickness variation and the flange constraints. The performance of the resulting method was evaluated by means of Finite Element Method simulations and tested during dedicated experimental validation campaigns; although it would be useful to extend the tests, the obtained results were satisfying, indicating that the derived solution may constitute a valid design tool for thermoformed flanged plastic domes, commonly adopted in the underwater field. As concerns instead the developed buoy, useful for the localization of underwater targets such as autonomous vehicles, it was designed by means of topology optimization techniques too, and then it has been mechanically tested and successfully employed during experimental tests at sea.
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Yousefpour, Ali. "Design, analysis, manufacture, and test of composite pressure vessels and finite element analysis of metallic frame for deep ocean underwater vehicle applications." 2000. http://wwwlib.umi.com/dissertations/fullcit/9990286.

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Books on the topic "Underwater vessel design"

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Flinders University. Dept. of Archaeology., ed. Australian built wooden sailing vessels of the South Australian intrastate trade. [Bedford Park, S. Aust.]: Department of Archaeology, Flinders University, 2007.

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Rodgers, Bradley A. Of limestone and labor: Shipwrecks of the stone trade : the 1999 Bullhead Point stone barge investigation. Greenville, N.C: Program in Maritime Studies, East Carolina University, 2003.

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Martin, Paula. Conclusion: Future Directions. Edited by Ben Ford, Donny L. Hamilton, and Alexis Catsambis. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780199336005.013.0047.

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This article demonstrates the extent to which underwater and maritime archaeology have developed and expanded over centuries. This article summarizes the study of shipwrecks and wider maritime culture in geographical areas throughout the world. Wrecked vessels reveal the technological achievements of their day. Warships demonstrate developments in aggressive and defensive technologies. Merchant vessels carry evidence of the range of cargoes traded. Underwater archaeology has gained wider acceptance and validity. The development of maritime archaeology targets future research to use resources efficiently. Maritime archaeologists center their work on understanding ships of all periods and all regions, from small vernacular craft to large naval vessels. This is leading to greater appreciation of the subtleties of design, regional variations, and complexity of construction methods. Progress in computing has made it possible to disseminate data. Deepwater archaeology has great potential in the future. Underwater archaeology will spread to more countries.
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Book chapters on the topic "Underwater vessel design"

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Beltrán Palomo, Publio. "Why Should Fishing Research Vessels (FRV) Be Certified? Their Technological Role in the Current Challenge to Reduce the Underwater Signature of Commercial and Navy Ships." In Proceeding of the VI International Ship Design & Naval Engineering Congress (CIDIN) and XXVI Pan-American Congress of Naval Engineering, Maritime Transportation and Port Engineering (COPINAVAL), 43–60. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-35963-8_5.

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Perrone, Christian. "SDO-SuRS Deployable Assets Program." In Progress in Marine Science and Technology. IOS Press, 2022. http://dx.doi.org/10.3233/pmst220077.

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ITA Navy has started a new program for the acquisition of a Naval Vessel called SDO-SuRS (Special and Diving Operation – Submarine Rescue Ship). In order to fulfill operational requirements, IT Navy has recently procured the so-called “SDO-SuRS Deployable Assets”. A temporary business grouping (RTI) between SAIPEM Spa (leader in robotics and offshore) and DRASS Srl (national excellence in the hyperbaric sector and rescue) is the enterprise selected for the scope. This grouping represents a national excellence and a technological reference point for IT Navy in the Submarine Escape and Rescue. The new SDO-SuRS Deployable assets will have specific peculiarities such as: modularity, deployability, interoperability and complementarity. Modular assets will be either installable on board the national mother ship SDO-SuRS or rapidly deployable in scalable configurations (from rapid intervention to deep rescue) on a vessel of opportunity, military or commercial, for far-from-home operations. In order to establish a framework on damaged submarines rescue’s topic between Countries within ISMERLO (International Submarine Escape and Rescue Liaison Office) and NATO organizations, Italy offers the opportunity of providing any type of technical-administrative support in design, procurement, Life Management System or training of SAIPEM – DRASS systems, useful to a potential cooperation in the Submarine Escape and Rescue. On the whole the above mentioned Submarine Rescue packages consist of a several assets as follow: ∙ Submarine Rescue Vehicle (SRV) tethered type composed by a Rescue Chamber and a WROV (Working Class Remote Operated Vehicle) which will be managed both aboard the SDO-SuRS ship (Mother Ship) and aboard the Vessel of Opportunity. The system has to be designed/realized to perform the search and rescue of DISSUB as well as the transfer of crew inside the Diving Decompression Chamber. ∙ Portable Launch and Recovery System (PLARS) to permit the Launch/Recovery of SRV/SRC and WROV; ∙ Diving Decompression Chambers (DDC) with TUP (Transit Under Pressure) to face a specific sanitary treatment which could involve the submarine’s crew; ∙ Ventilation System (VS) by means of which will be possible the change of dirty air inside of the distressed submarine as well as the air insufflation to main ballast tanks; ∙ Submarine Rescue Chamber (SRC); ∙ Working Class Remote Operated Vehicle (WROV) able to perform underwater work and completely redundant with the WROV associated to SRV.
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Shipman, Steve, and Anthony Laughton. "Historical Methods of Depth Measurement." In Continental Shelf Limits. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195117820.003.0014.

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In establishing the limits of the continental shelf, there are two aspects to the use of depth data. Shallow water depths are used to determine the low-water or drying line and hence the baseline from where the measurement of the various limits begin. Deepwater depths are used to determine the foot of continental slope and the 2500-m isobath, which in turn will help to decide where these limits should end. While the principle focus of this book is the delimitation of the outer limit of the continental shelf, some aspects of depth measurement are applicable to both shallow and deepwater measurements, and therefore, in order to provide a complete picture, all aspects will be considered in this chapter. For as long as people have ventured out to sea in boats, they have been interested in obtaining a knowledge of the depth of water and the position of underwater obstructions in order to avoid damaging and possibly losing their vessels. Information was valuable, and having been obtained by ships' captains, either by purchasing it from others or by carrying out their own surveys, it was not readily divulged to other people. It was the formation of national hydrographic offices in the 18th century that started the coordinated collection and wide dissemination of hydrographic data. The earliest methods of measuring depth involved the lowering of a weighted line over the side of the vessel until it hit the seabed or in the case of very shallow water, the use of a graduated pole. Measurements were restricted to shallow water until the latter part of the 18th century. Captain Phipps in HMS Racehorse recorded a depth of 683 fathoms in the Norwegian Sea in 1773. Measuring such depths was a very slow, weatherdependent process, but with the growing interest in the oceans, especially the desire to lay underwater telegraph cables in the second half of the 19th century, the techniques were improved. By 1855, Matthew Fountaine Maury of the U.S. Naval Observatory had accumulated sufficient depths to publish a first attempt at a contour chart of the Atlantic Ocean. In 1904, the first global set of such charts was published by GEBCO.
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Conference papers on the topic "Underwater vessel design"

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Bonney, David, and Michael Bahtiarian. "Design of a Coastal Research Vessel with Low Underwater Noise Signature." In OCEANS 2006. IEEE, 2006. http://dx.doi.org/10.1109/oceans.2006.307000.

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Iyama, Hirofumi, Yoshikazu Higa, and Shigeru Itoh. "Shock Wave Propagation Inside of Pressure Vessel Used for Food Processing." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78292.

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In this study, it has aimed at the design of the pressure vessel for food processing using an underwater shock wave. This study aims at the design of a pressure vessel in which the underwater shock wave generated by the underwater explosion of high explosive was experimentally investigated by the optical observation and the pressure measurement. Therefore the pressure vessel is designed so that suitable pressure may apply on food. This designed vessel is evaluated by the numerical simulation. The interaction of the underwater shock wave, the incident wave and the reflected wave are investigated by the numerical simulation.
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Muscat, Martin, Mark Formosa, German A. Salgado Martin, Rosario Sinatra, and Alessandro Cammarata. "Design of an Underwater Towfish Using Design by Rule and Design by Analysis." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28122.

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The European unfired pressure vessel code EN13445-3 [1] has been used to design a preliminary prototype of a towfish. The towfish is essentially an underwater vessel equipped with various sensors, cameras, hydroplanes and control systems that are used to capture data on the levels of pollutants in the sea and at the same time monitor plankton and jellyfish levels. The towfish is towed behind a surface ship and is designed to dive to a depth of 50m below sea level. The depth of dive can be controlled by means of hydroplanes. Data, signals and electrical power are transferred from the towfish to the surface ship and vice versa via the towing line. From a structural point of view the towfish is a vessel acted upon by external pressure and local loads. Design by rule (DBR) was first used to calculate some of the various dimensions and thicknesses of the towfish components. The various components were designed mainly to prevent failure due to buckling. Design by analysis (DBA) based on Annex B of the pressure vessel code EN13445-3 [1] was then used to carry out further buckling checks that were not possible to do using design by rule. At the end of the paper the results from the two design approaches are compared and any major differences are highlighted.
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Otsuka, Masahiko, Toshiaki Watanabe, and Shigeru Itoh. "Numerical Simulation for Development of Pressure Vessel for Food Processing by Shock Loading." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93470.

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In this study, it has aimed at the design of the pressure vessel where an underwater shock wave is applied to food efficiently. This study aims at the desigh of a pressure vessel in which the underwater shock wave generated by the underwater explosion of detonating fuse was experimentally investigated by the optical observation and the pressure measurement. Therefore the pressure vessel is designed so that suitable pressure may apply on food. This designed vessel is evaluated by the numerical analysis that used LS-DYNA3D. The interaction of the underwater shock wave, the incident wave and the reflected wave are investigated by the numerical analysis. The agreement between the experimental results and the numerical analysis was found to be good.
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Lee, S. J., H. J. Kim, J. H. Lee, J. H. Kim, and J. S. Seo. "Prediction of underwater noise for environmental impacts: Evaluation of a commercial vessel and offshore structure." In SNAME Maritime Convention. SNAME, 2010. http://dx.doi.org/10.5957/smc-2010-t16.

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The study of the environmental impact of underwater noise has become increasingly visible. Recently, underwater noise regulation has become an international concern. Therefore, the mitigation of underwater noise emission in operation is an important factor in the design of environmentally friendly ship and offshore structures. As a shipbuilding company, in order to meet the increasing demand for an eco-friendly vessel, Samsung Heavy Industries Co., Ltd. has developed a standard procedure to estimate underwater noise in the initial design phase. This procedure can be used both to design a low-noise vessel and also to evaluate environmental impact. In this paper, the procedure employed to estimate underwater noise is presented with results from full-scale measurements.
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Naha, Kazuyuki, Ken Shimojima, Yoshitaka Miyafuji, and Shigeru Itoh. "Design and Development of Pressure Vessel for Improvement of Manufacturing Rice-Powder Efficiency Using Underwater Shock Wave." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78439.

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The rice-powder paid to attention in Japan, because the various food made by rice-powder. But, conventional method of manufacturing rice-powder generates heat when crushing of rice. One the other hand, the pressure vessel of oval structure for manufactured rice-powder using underwater shock wave has been developed in Okinawa National College of Technology. The merits of this system manufacture rice-powder without heating. But, the efficiency of this system is low. Therefore, in this paper, we propose new design of pressure vessel for the highly effective rice-powder manufacturing. To design a new pressure vessel, it is clear that the performance of the oval structure pressure vessel. And, we design and manufacturing new pressure vessel for the highly effective rice-powder manufacturing.
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Greve, Martin, Martin Kurowski, Sebastian Ritz, Matthias Golz, Lakshmi Narasiman Vijayasarathi, Nursen Bayazit, and Erik Rentzow. "Design of the Propulsion System for the Autonomous XLUUV MUM." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78583.

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Abstract The paper reports on one aspect in the design of the extra-large unmanned underwater vehicle (XLUUV) MUM, referring to a large Modifiable Underwater Mothership. The vessel will be highly modular and has unique features, such as hydrogen fuel cell and lithium-ion batteries. Modules can be added and rearranged to fulfill different operations. The envisaged operation scenarios pose a challenge to the design of the propulsion and maneuvering system. Due to the limited power and energy storage, it must be efficient during submerged transit, capable of safe surfaced operation in public sea routes and of dynamic positioning. A design study is presented based on an initial design of two variants. The basic hull forms are compared in terms of required forces and moments for vessel motions. Simulations of hull forces are conducted using Reynolds-averaged Navier-Stokes (RANS) equations and vessel motions are determined with an actuator force model. Different arrangements of propulsors and thrusters are investigated and compared concerning their propulsion efficiency and their agility in translatory and rotary directions. The results are presented as tabulated data and in capability plots. A final design is presented and discussed and a conclusion is presented.
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Iyama, Hirofumi, Masatoshi Nishi, Yoshikazu Higa, Ken Shimojima, Osamu Higa, and Shigeru Itoh. "Numerical Simulation on Manufacturing of Pressure Vessel for Shock Food Processing Using Explosive Forming." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-64020.

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The explosive forming is a characteristic forming method. An underwater shock wave is generated by underwater explosion of the explosive. A metal plate is affected high strain rate by the shock loading and is formed along a metal die. Although this method has the advantage of mirroring the shape of the die, a free forming was used in this paper. An expensive metal die is not necessary for this free forming. It is possible that a metal plate is formed with simple supporting parts. However, the forming shape is depend on the shock pressure distribution act on the metal plate. This pressure distribution is able to change by the shape of explosive, a mass of explosive and a shape of pressure vessel. On the other hand, we need the pressure vessel for food processing by the underwater shock wave. Therefore, we propose making the pressure vessel by the explosive forming. One design suggestion of pressure vessel made of stainless steel was considered. However, we cannot decide suitable conditions, the mass of the explosive and the distance between the explosive and the metal plate to make the pressure vessel. In order to decide these conditions, we have tried the numerical simulation of this explosive forming. The basic simulation method was ALE (Arbitrary Laglangian Eulerian) method. Mie-Grümeisen EOS (equation of state), JWL EOS, Johnson-Cook constitutive equation for a material model were applied in the numerical simulation. In this paper, the underwater pressure contours to clear the propagations of the underwater shock wave, forming processes and deformation velocity of the metal plate is shown and it will be discussed about those results.
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Wang, Yueping. "Evaluation of Designs of Shipboard Cathodic Protection Systems Using Boundary Element Modelling Technique." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48739.

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Boundary element modelling technique was used to evaluate the performance of the underwater hull impressed current cathodic protection (ICCP) system of a steel-hulled vessel, as part of an investigation of the corrosion failure of the steel hull near the ICCP anodes. The same technique was also used to evaluate the designs of an alternate sacrificial anode cathodic protection system. The modelling results indicated that the existing ICCP system was capable of providing adequate cathodic protection to the underwater hull and appendages if the current demand is less than 2.4 A. Small anode size was found to have a profound effect on the potentials immediately adjacent to the anode, stressing the need for an effective, intact anode shield. Application of paint coating on the bronze propellers could substantially reduce the current demand from the anodes, resulting in less negative potentials adjacent to the anodes. The modelling results also showed that the anode design adopted from a vessel of similar size (<5% difference in all dimensions), which consists of 8 hull mounted aluminum anodes and 4 rudder zinc anodes, would provide adequate cathodic protection for the underwater hull structures of the existing vessel for more than 3 years. The performance of a modified anode placement was also studied in comparison with that of the original anode placement. The results indicated that the anodes in the modified anode placement would not only contribute more uniform current than the anodes in the original anode placement, but also result in the potential profiles that have less variations along the hull form. This modified anode placement would potentially result in a longer service life of the anodes.
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10

Berge, Mark, Lance Birdsall, Adam Erickson, and Tanya Vernon. "Underwater Habitat Clamp (UHC): An Innovative Partnership in Underwater Pipeline Repair." In 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64607.

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Abstract:
We present a hybrid solution (UHC) for multi-parameter underwater pipeline repair. The UHC project involved three phases 1) initial assessment and temporary repair 2) design of novel solution taking consideration of all parameters and 3) implementation. The resulting vessel enables repairs on pipelines 6″ to 36″ in diameter and to depths of up to 33′, under one atmosphere of pressure or in a true hyperbaric environment. In the project, the UHC was lowered into position, hydraulically clamped around a pipeline, sealed to the pipeline, counterweighted to negate buoyancy, and pumped dry yielding a submerged dry habitat; equipped with leg support from the river bottom and anchor attachment points to compensate for current. Two manways extend to the surface of the water. Air movers, rescue and other equipment are installed and the UHC is occupied by confined space trained personnel, welding technicians and inspectors. The pipeline was then repaired with no compromise in integrity or need to take the pipeline out of service.
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