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Artículos de revistas sobre el tema "Underwater vessel design"

Autor: Grafiati
Publicado: 10 de marzo de 2023

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1

Frumen, А., and C. Mednikov. "Multihull underwater vessel: design challenges." Transactions of the Krylov State Research Centre S-I, no. 2 (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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2

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. Calculat
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3

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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4

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 (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 aime
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5

Morrissey, George R., and Michael C. Stone. "Diving Support Vessel Concept Design." Marine Technology and SNAME News 34, no. 02 (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.
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6

MacGillivray, Alexander O., Laurie M. Ainsworth, Joanna Zhao, et al. "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 (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
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7

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 (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 a
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8

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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9

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
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10

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 (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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11

Pavan Kumar, GVV, V. V. S. Prasad, and B. H. Nagesh. "Measurement of small vessel machinery vibration induced acoustic signature levels." Journal of Naval Architecture and Marine Engineering 16, no. 2 (2019): 87–98. http://dx.doi.org/10.3329/jname.v16i2.42030.

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Ship vibrations, airborne and underwater noise levels have always been a challenging topic from a performance point of view in ship design, building and operation. The measurement shall help in monitoring the self-noise and the technical state of their machinery mechanism. The vibration levels on the main engine and auxiliary Genset foundation, airborne noise levels of the engine room and underwater self-noise levels of a small mechanized fishing trawler was measured at the jetty in idling condition. The vibration levels on the foundation measured the average value of 0.207 mm/s for the main e
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12

Sunaryo and Pradhana Shadu Imfianto. "Electrical System Design of Solar-Powered Electrical Water Recreational and Sport Vessel." E3S Web of Conferences 130 (2019): 01029. http://dx.doi.org/10.1051/e3sconf/201913001029.

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Indonesia is the world’s largest archipelago with more than 17 000 islands, and the best marine tourism destination due to its beautiful beaches and underwater scenery, but Indonesia is also the most vulnerable country to be affected by climate change due to the greenhouse effect. Besides industry, the transportation sector is the highest contributor to the global greenhouse effect. In order to reduce the source of the greenhouse effect, the Indonesian Government has committed to using new and renewable energy as an alternative to fossil-based fuel. In an attempt to contribute to the Governmen
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13

Huang, Tao Wei, Di Xiang Chen, and Cheng Guang Fan. "Simulation and Design of Portable Underwater Acoustic Transducer Test Device." Applied Mechanics and Materials 599-601 (August 2014): 445–50. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.445.

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In this paper, a portable underwater acoustic transducer sensitivity test device is designed to overcome the disadvantages of traditional test methods, such as the bigger size of anechoic pool, and single function of the vibrating column of liquid method. This new design has the advantage of small size, easy to carry and implement. A model of this device is constructed based on the finite element analyse software COMSOL Multiphysics. By calculating the sound field distribution of the test device model, the optimization size of the piezoelectric ceramic can be determined. Also the effect of som
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14

Blintsov, Vladimir S., Konstantin S. Trunin, and Wiesław Tarełko. "Determination of Additional Tension in Towed Streamer Cable Triggered by Collision with Underwater Moving Object." Polish Maritime Research 27, no. 2 (2020): 58–68. http://dx.doi.org/10.2478/pomr-2020-0027.

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AbstractThe paper deals with issues connected with the behaviour of a streamer cable towed by a survey seismic vessel when the cable undergoes a strike triggered by collision with an underwater moving object. The consequences of such collisions may be both threat to the life of marine animals or damage to underwater units and large economic losses suffered by vessel owners. The risk of such collisions has increased over the last years as a result of increased offshore seismic survey operations. Therefore, a towed streamer should be very robust. To assure its robustness, we should know the defo
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15

Chou, Chun-Feng, Cheng-Mu Tsai, Chao-Hsien Chen, et al. "Optical Design and Optimization with Genetic Algorithm for High-Resolution Optics Applied to Underwater Remote-Sensing." Applied Sciences 11, no. 21 (2021): 10200. http://dx.doi.org/10.3390/app112110200.

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In fields such as biology, archeology, and industry, underwater photogrammetry can be achieved using consumer-grade equipment. However, camera operations underwater differ considerably from those on land because underwater photogrammetry involves different optical phenomena. On the basis of the requirements and specifications of the marine vessel Polaris, we developed a novel underwater camera with prime and zoom lenses and a high resolving power. The camera can be used in the spectrum in shallow water and the blue–green spectrum in deep water. In the past, ordinary cameras would be placed in
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16

MacGillivray, Alexander O., and Laurie Ainsworth. "Quantifying uncertainty of shipping source levels for marine soundscape modeling." Journal of the Acoustical Society of America 151, no. 4 (2022): A66. http://dx.doi.org/10.1121/10.0010679.

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Soundscape modeling is increasingly being used in assessments of marine habitat quality and to inform marine spatial planning. In most locations of interest, noise from shipping traffic and other marine vessels is the dominant anthropogenic contributor to the underwater soundscape. The noise contributions of marine vessels are typically calculated using tracking data from sources such as the automated identification system (AIS) and the vessel monitoring system (VMS). However, source levels of individual vessels in these datasets are often highly uncertain and must be estimated from incomplete
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17

Park, Eun-Young, and Jungho Choi. "The Performance of Low-Pressure Seawater as a CO2 Solvent in Underwater Air-Independent Propulsion Systems." Journal of Marine Science and Engineering 8, no. 1 (2020): 22. http://dx.doi.org/10.3390/jmse8010022.

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Air-independent propulsion systems have improved the performance and decreased the vulnerability of underwater weapon systems. Reforming systems, however, generates large amounts of water and CO2. The recovery or separation of CO2, a residual gas component generated in vessels, entails considerable cost and energy consumption. It is necessary to understand the characteristics of the interaction between CO2 and seawater under the conditions experienced by underwater weapon systems to design and optimize a CO2 treatment process for dissolving CO2 in seawater. In this study, numerical analysis wa
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18

YOSHIMURA, Yasuo, and Yasunari KOYANAGI. "Design of a Small Fisheries Research Vessel with Low Level of Underwater-Radiated Noise." Journal of the Marine Acoustics Society of Japan 31, no. 3 (2004): 137–45. http://dx.doi.org/10.3135/jmasj.31.137.

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19

Lee, Minuk, Soung-Jea Park, Tae-Kyeong Yeu, et al. "Optimum Design of Underwater Connector Hole Arrangement for Deep-sea Pressure Vessel Cover Plate." Transactions of the Korean Society of Mechanical Engineers A 36, no. 12 (2012): 1627–33. http://dx.doi.org/10.3795/ksme-a.2012.36.12.1627.

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20

Takemura, Fumiaki, Reyes Tatsuru Shiroku, Kuniaki Kawabata, and Shinichi Sagara. "Development of Easy-Removable Underwater Manipulator Unit with Built-in Controller." Journal of Robotics and Mechatronics 25, no. 5 (2013): 778–84. http://dx.doi.org/10.20965/jrm.2013.p0778.

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In recent years, coral cover has been decreased by the impact of bleaching due to high water temperature, red-soil runoff, water pollution, and coral-eating starfish outbreak. It is necessary to appropriately measure, observe, and sample seawater. To succeed in these tasks, underwater robots should have a function of responds flexibly in solving problems. Underwater tasks are summarized as follows: (1) acquiring images and environmental information using cameras and sensors, (2) collecting objects and other necessary work using robot hands. Manipulator should be attached quickly to underwater
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21

Regina, Bruno A., Leonardo M. Honório, Antônio A. N. Pancoti, et al. "Hull and Aerial Holonomic Propulsion System Design for Optimal Underwater Sensor Positioning in Autonomous Surface Vessels." Sensors 21, no. 2 (2021): 571. http://dx.doi.org/10.3390/s21020571.

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Acoustic Doppler Current Profiler (ADCP) sensors measure water inflows and are essential to evaluate the Flow Curve (FC) of rivers. The FC is used to calibrate hydrological models responsible for planning the electrical dispatch of all power plants in several countries. Therefore, errors in those measures propagate to the final energy cost evaluation. One problem regarding this sensor is its positioning on the vessel. If placed on the bow, it becomes exposed to flowing obstacles, and if it is installed on the stern, the redirected water from the boat and its propulsion system change the sensor
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22

Lowes, Gavin James, Jeffrey Neasham, Richie Burnett, Benjamin Sherlock, and Charalampos Tsimenidis. "Passive Acoustic Detection of Vessel Activity by Low-Energy Wireless Sensors." Journal of Marine Science and Engineering 10, no. 2 (2022): 248. http://dx.doi.org/10.3390/jmse10020248.

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This paper presents the development of a low-energy passive acoustic vessel detector to work as part of a wireless underwater monitoring network. The vessel detection method is based on a low-energy implementation of Detection of Envelope Modulation On Noise (DEMON). Vessels produce a broad spectrum modulated noise during propeller cavitation, which the DEMON method aims to extract for the purposes of automated detection. The vessel detector design has different approaches with mixtures of analogue and digital processing, as well as continuous and duty-cycled sampling/processing. The detector
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23

Zhang, Jiarui, Zhixun Xia, Liya Huang, and Likun Ma. "Predicted performance of a two-phase underwater ramjet with a Laval nozzle." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 3 (2018): 937–48. http://dx.doi.org/10.1177/1475090218795585.

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To predict engine performance and further instruct the integral engine design, a more reasonable and accurate numerical model of the two-phase underwater ramjet was introduced in this article by considering the bubble formation process. Two-fluid model was used to examine the bubbly flow in the nozzle and its mathematical model was solved by a fourth-order Runge–Kutta method. Subsequently, the influences of vessel velocity, gas mass flow rate, navigational depth, and orifice diameter of the bubble injector on the performance of the engine were discussed. Results show that, compared with conver
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24

Brown, Hunter C., Liza K. Jenkins, Guy A. Meadows, and Robert A. Shuchman. "BathyBoat: An Autonomous Surface Vessel for Stand-alone Survey and Underwater Vehicle Network Supervision." Marine Technology Society Journal 44, no. 4 (2010): 20–29. http://dx.doi.org/10.4031/mtsj.44.4.5.

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AbstractExploration of remote environments, once the domain of intrepid adventurers, can now be conducted in relative safety using unmanned vehicles. This article describes the joint University of Michigan (UMich) and Michigan Tech Research Institute’s project to design and to build a new autonomous surface vessel (ASV) for use in research, education, and resource management as well as in the commercial sector.Originally designed to assist with bathymetric surveys in the wilderness of northern Alaska, the BathyBoat has become a test-bed platform for new research in collaborative heterogeneous
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25

Zhu, Chenyang, Tomaso Gaggero, Nicholas C. Makris, and Purnima Ratilal. "Underwater Sound Characteristics of a Ship with Controllable Pitch Propeller." Journal of Marine Science and Engineering 10, no. 3 (2022): 328. http://dx.doi.org/10.3390/jmse10030328.

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The time-dependent spectral characteristics of underwater sound radiated by an ocean vessel has complex dependencies on ship machinery, propeller dynamics, hydrodynamics of ship exhaust and motion, as well as ship board activities. Here the underwater sound radiated by a ship equipped with a controllable pitch propeller (CPP) is analyzed and quantified via its (i) power spectral density for signal energetics, (ii) temporal coherence for machinery tonal sound, and (iii) spectral coherence for propeller amplitude-modulated cavitation noise. Frequency-modulated (FM) tonal signals are also charact
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26

Azarsina, Farhood, Mohammad Shahabadi, and Arash Shadlaghani. "Numerical Derivation of Hydrodynamic Forces and Invention of a New Diving Technique for the Batoid Underwater Robot." Marine Technology Society Journal 50, no. 5 (2016): 59–73. http://dx.doi.org/10.4031/mtsj.50.5.7.

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AbstractAs part of a design project for a batoid-inspired underwater robot, its dive to a predetermined depth is questioned here. Previously, the vehicle was designed with a streamlined hull shape that resembles a Dasyatis batoid fish, and the fish locomotion was imitated using undulating fins at each side. We did not, however, provide a buoyancy engine or any fins to turn the vessel in the vertical plane and conduct diving maneuvers. We expect to leave the vessel on the water surface, and it dives to a desired depth and then maintains a constant pitch angle and a constant forward speed. A new
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27

Liu, Hanlin, Fuxian Gong, and Oscar Curet. "Unleashing the Potential of Undulating Fin Propulsion Using a Biomimetic Robotic Vessel." Marine Technology Society Journal 51, no. 5 (2017): 79–93. http://dx.doi.org/10.4031/mtsj.51.5.7.

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AbstractUndulating fins are an excellent propulsion model for highly maneuverable underwater vehicles, due to their rich locomotor capabilities and high efficiency at moderate speed. In this study, we designed, developed, and tested a self-contained, free-swimming robotic device, the KnifeBot, to emulate the locomotor behaviors of knifefish, a typical fish that excels in using this type of propulsion. This novel biomimetic underwater vehicle uses an elongated ribbon-like fin composed of 16 fin rays interconnected by a compliant membrane as the propulsor. It features a slender 3D printed hull,
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28

Siqueira Nóbrega de Freitas, Artur, Alexander Alfonso Alvarez, Roberto Ramos, and Ettore Apolonio de Barros. "Buckling Analysis of an AUV Pressure Vessel with Sliding Stiffeners." Journal of Marine Science and Engineering 8, no. 7 (2020): 515. http://dx.doi.org/10.3390/jmse8070515.

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The structure of an autonomous underwater vehicle (AUV), usually composed of a cylindrical shell, may be exposed to high hydrostatic pressures where buckling collapse occurs before yield stress failure. In conventional submarines, welded stiffeners increase the buckling resistance, however, in small AUVs, they reduce the inner space and cause residual stresses. This work presents an innovative concept for the structural design of an AUV, proposing the use of sliding stiffeners that are part of the structure used to accommodate the electronics inside it. Since the sliding stiffeners are not wel
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29

Aktas, Batuhan, Naz Yilmaz, Mehmet Atlar, Noriyuki Sasaki, Patrick Fitzsimmons, and David Taylor. "Suppression of Tip Vortex Cavitation Noise of Propellers using PressurePoresTM Technology." Journal of Marine Science and Engineering 8, no. 3 (2020): 158. http://dx.doi.org/10.3390/jmse8030158.

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This study aims to demonstrate the merits of pressure-relieving holes at the tip region of propellers, which is introduced as “PressurePoresTM” technology as a retrofit on marine propellers to mitigate tip vortex cavitation noise for a quieter propeller. Shipping noise originates from various sources on board a vessel, amongst which the propeller cavitation is considered to dominate the overall radiated noise spectrum above the inception threshold. Thus, by strategically introducing pressure-relieving holes to modify the presence of cavitation, a reduction in the overall cavitation volume can
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30

Celik, Fahri, and Mesut Guner. "An Improved Lifting Line Model for the Design of Marine Propellers." Marine Technology and SNAME News 43, no. 02 (2006): 100–113. http://dx.doi.org/10.5957/mt1.2006.43.2.100.

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This paper describes a procedure for the design of marine propellers where more realistic representation of the slipstream shape by the trailing vortex system is taken into account. The slipstream shape behind the propeller is allowed to deform and to align with the direction of local velocity, which is obtained by the sum of the inflow velocity and induced velocities due to the trailing vortices. In classical lifting line approaches, that deformation is neglected. Applications for an autonomous underwater vehicle (AUV) and a fishing vessel are carried out to demonstrate propeller design and t
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31

Zou, Chun-Ping, Duan-Shi Chen, and Hong-Xing Hua. "Investigation of Ship Structural Vibration and Underwater Radiation Noise." Journal of Ship Research 47, no. 04 (2003): 275–89. http://dx.doi.org/10.5957/jsr.2003.47.4.275.

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Underwater radiation noise is a very important factor for most ships, such as fishing boats, warships, and so forth. The magnitude of its energy depends on the vibration of the hull in contact with water. The vibration of the hull caused by the power plant, while the vessel is cruising, is the dominant source of underwater radiation noise, which is the subject of our investigation. In this paper, the coupled finite element/boundary element method is used to investigate ship structural vibration and underwater radiation noise. The finite element method (FEM) is employed to analyze modes and vib
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32

Azarsina, Farhood. "Designing a Hydrodynamic Shape and Thrust Mechanism for a Batoid Underwater Robot." Marine Technology Society Journal 50, no. 5 (2016): 45–58. http://dx.doi.org/10.4031/mtsj.50.5.6.

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AbstractGiven the facts that a vast area of the earth is covered by water and the average depth of the oceans is more than 3,000 m, the issue of the unknowns beneath the water surface is a challenging and questionable one. It has been a few decades since remotely operated vehicles as well as untethered underwater robots have appeared and elevated the level of complex engineering. In this category, underwater robots that mimic fish and aquatic creatures open new horizons. In this article, imitating the body shape, kinematics, and swimming mechanism of a batoid fish (Dasyatidae), a vessel is des
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33

Codiga, Daniel L. "A Marine Autonomous Surface Craft for Long-Duration, Spatially Explicit, Multidisciplinary Water Column Sampling in Coastal and Estuarine Systems." Journal of Atmospheric and Oceanic Technology 32, no. 3 (2015): 627–41. http://dx.doi.org/10.1175/jtech-d-14-00171.1.

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AbstractThe Surveying Coastal Ocean Autonomous Profiler (SCOAP) is a large catamaran marine autonomous surface craft (MASC) for unattended weeks-long, spatially explicit, multidisciplinary oceanographic water column profile sampling in coastal/estuarine waterbodies. Material transport rates/pathways, crucial to understanding these ecosystems, are typically poorly known. SCOAP addresses demanding spatiotemporal sampling needs and operational challenges (strong currents, open coastal sea states, complex bathymetry, heavy vessel traffic). Its large size (11-m length, 5-m beam) provides seaworthin
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34

Xie, Chao, Lan Wang, Ning Yang, et al. "A Compact Design of Underwater Mining Vehicle for the Cobalt-Rich Crust with General Support Vessel Part A: Prototype and Tests." Journal of Marine Science and Engineering 10, no. 2 (2022): 135. http://dx.doi.org/10.3390/jmse10020135.

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This paper proposed a compact design of the subsea cobalt-rich crust mining vehicle with a general purpose support vessel for subsea resource exploration, sample collection, and research. The necessary functions were considered in the concept design, including walk, crushing/mining, sample collection, cutter head adaptation, vehicle orientation, crust texture measurement, awareness, positioning, and navigation. The prototype was tested in both tank and subsea environment. The sea trials were carried out with the support of a general purpose support vessel. The track design worked well in both
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35

Grządziela, Andrzej, and Marcin Kluczyk. "Preliminary Calculations for Minehunter's Genset Foundations." Transactions on Maritime Science 8, no. 1 (2019): 54–61. http://dx.doi.org/10.7225/toms.v08.n01.006.

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The requirements for the foundations of naval vessel engines are based on classification rules devised by classification societies or/and military standardization rules. A class guideline was published, defining the requirements, acceptance criteria and machinery seating methods. There is also a schedule of basic calculation procedures for cast resin or rubber chocks which facilitates the process of machinery foundation design, preloading force calculation, the establishment of boundary conditions etc. In case of naval vessels, typical procedures do not meet tactical requirements due to potent
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36

Pan, Shou Li, and Qiang Zhou. "Natural Supercavitation Characteristic Simulation of Small-Caliber Projectile." Applied Mechanics and Materials 488-489 (January 2014): 1243–47. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.1243.

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Based on the multiphase model of FLUENT 6.3,a underwater projectile cavitation model is established for a new designed underwater projectile which have a disc cavitator.Then the cavitation number influence on cavitation form is concerned and contrast with the empirical formula of cavitation form.The conclusion is：with the increase of cavitation number,the drag coefficient will increase non-linear;the cavitation slenderness radio is greater,the drag coefficient is smaller. Supercavitation phenomenon is that when a object moves in water and it’s speed increases constantly, according to Bernoulli
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37

Varshney, Nidhi, Siva Rajesh, Anantha Padmanabhan Aarthi, et al. "Estimation of Reliability of Underwater Polymetallic Nodule Mining Machine." Marine Technology Society Journal 49, no. 1 (2015): 131–47. http://dx.doi.org/10.4031/mtsj.49.1.4.

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AbstractThis paper presents the reliability analysis carried out on the subsystems of the underwater polymetallic nodule mining machine developed by National Institute of Ocean Technology, India, which is being enhanced for polymetallic nodule mining technology demonstration at 6,000-m water depth in the Central Indian Ocean Basin, where manganese nodules are available in abundance. The mining machine, which is a tracked vehicle, was successfully demonstrated at a water depth of 512 m, wherein the nodules are collected, crushed, and pumped to the mother vessel. Reliable long-term operation at
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38

Yang, D., XQ Lv, and YL Xiong. "A computational fluid dynamics study on the solid mineral particles-laden flow in a novel offshore agitated vessel." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 2 (2018): 622–31. http://dx.doi.org/10.1177/1475090218776143.

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Most seabeds are unexplored and rich in mineral deposits, making offshore mining a promising activity. However, offshore operation brings in great challenges from technical equipment to physical space. For instance, an offshore agitated vessel is supposed to stabilize the solids concentration from the underwater mining and make little impact on the stability of the platform or ship. For this reason, we proposed a novel offshore agitated vessel. The whole system based on the arrangement of the mineral processing platform and the slurry mix flow rate is obtained from the previous design stage. L
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39

Haq, Mazhar Ul, Zhao Gang, Shaban Usman, Anees Ur Rehman, and S. M. Aftab. "Forward Kinematic Analysis of IPMC Actuated Three Link Mechanism for Fin Actuation of Fish Like Micro Device." Journal of Biomimetics, Biomaterials and Biomedical Engineering 23 (June 2015): 67–75. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.23.67.

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IPMC is becoming an increasingly popular material among scholars, engineers and scientists due to its inherent properties of low activation voltage, large bending strain, flexibility, softness, suitable response time which make them a strong candidate to be applied as artificial muscle in biomimetic land and underwater applications. The applications of IPMC have been growing due to progression in its manufacturing techniques, development of more accurate response models and control techniques, and recently more sophisticated IPMC actuator applications have been performed. In this paper, a new
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40

Rowinski, Lech, and Maciej Kaczmarczyk. "Evaluation of Effectiveness of Waterjet Propulsor for a Small Underwater Vehicle." Polish Maritime Research 28, no. 4 (2021): 30–41. http://dx.doi.org/10.2478/pomr-2021-0047.

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Abstract The goal of the project described is to replace the existing propulsion system of a small underwater vehicle with a solution less prone to mechanical damage and ensuring a lower risk of the entanglement of fibrous objects suspended in the body of water. Four typical marine screws are utilised in the current design of the vehicle. One possible solution of the problem is the application of waterjet propulsors located inside the body of the vehicle instead. The general condition of the application of the new solution was to secure at least the same motion control capabilities of the vehi
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41

Joung, Tae-Hwan, Jae-Hwan Lee, In-Sik Nho, et al. "A study on the pressure vessel design, structural analysis and pressure test of a 6000 m depth-rated unmanned underwater vehicle." Ships and Offshore Structures 3, no. 3 (2008): 205–14. http://dx.doi.org/10.1080/17445300802204371.

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42

Haq, Mazhar Ul, Zhao Gang, Fazl E. Ahad, Anees Ur Rehman, and Muhammad Hussain. "Inverse Kinematic Analysis of Three Link Mechanism for Fin Actuation of Fish Like Micro Device." Journal of Biomimetics, Biomaterials and Biomedical Engineering 24 (July 2015): 77–81. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.24.77.

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In this paper, inverse kinematic analysis of a proposed three link mechanism of a bio-inspired micro scanning device towed underwater by a surface vessel to actuate its aileron fins for its depth control and for its stabilization against roll is performed. Mechanism is actuated by IPMC actuators. To speed up the design verification process, computer aided simulations are used to perform motion analysis of the proposed IPMC actuated mechanism through Pro/Mechanism tool. Inverse kinematic analysis is performed to find out the joint variables of the mechanism to realize fin actuation along desire
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43

Nsalo Kong, Darryl Franck, Chong Shen, Chuan Tian, and Kun Zhang. "A New Low-Cost Acoustic Beamforming Architecture for Real-Time Marine Sensing: Evaluation and Design." Journal of Marine Science and Engineering 9, no. 8 (2021): 868. http://dx.doi.org/10.3390/jmse9080868.

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This paper mainly studies the performance of an acoustic beamforming technique applied to a low-cost hydrophone in a linear array of two to four elements for the detection and localization of underwater acoustic sound waves. It also evaluates the integration of the array in an energy-efficient real-time monitoring system architecture, allowing marine sensing to be conducted without human intervention. Such architecture would consist of vertical linear arrays of two or four RHSA-10 hydrophones models attached to a buoy or a vessel for sound detection; a frequency domain beamformer (FDB) techniq
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44

Chen, Chen-Wei, and Yi-Fan Lu. "Computational Fluid Dynamics Study of Water Entry Impact Forces of an Airborne-Launched, Axisymmetric, Disk-Type Autonomous Underwater Hovering Vehicle." Symmetry 11, no. 9 (2019): 1100. http://dx.doi.org/10.3390/sym11091100.

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An autonomous underwater hovering vehicle (AUH) is a novel, dish-shaped, axisymmetric, multi-functional, ultra-mobile submersible in the autonomous underwater vehicle (AUV) family. Numerical studies of nonlinear, asymmetric water entry impact forces on symmetrical, airborne-launched AUVs from conventional single-arm cranes on a research vessel, or helicopters or planes, is significant for the fast and safe launching of low-speed AUVs into the target sea area in the overall design. Moreover, a single-arm crane is one of the important ways to launch AUVs with high expertise and security. However
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45

Matthews, Michael L., Jeff Bos, Jacquelyn M. Crebolder, and Sharon McFadden. "Modeling the Effectiveness of Tools to Assist Sonar Operators." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 49, no. 12 (2005): 1124–28. http://dx.doi.org/10.1177/154193120504901205.

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The task of building the underwater picture from sonar data is made complex by high volumes of noise and multiple data that arrive from a variety of acoustic sources detected at great distances by modern, sonar equipment. Typically, acoustic sources from ships have a complex spectrum consisting of several base frequency components and related harmonics. The task for operators is to analyse the data to determine if there is a pattern that represents the signature of a known source, thereby leading to identification of a vessel. Since the task can be highly labour intensive automated decision ai
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46

Kraft, Martin, Michael Jakusch, Manfred Karlowatz, Abraham Katzir, and Boris Mizaikoff. "New Frontiers for Mid-Infrared Sensors: Towards Deep Sea Monitoring with a Submarine FT-IR Sensor System." Applied Spectroscopy 57, no. 6 (2003): 591–99. http://dx.doi.org/10.1366/000370203322005256.

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A sub-sea deployable fiber-optic sensor system for the continuous determination of a range of environmentally relevant volatile organic compounds in seawater has been developed. The prototype of a robust, miniaturized Fourier transform infrared (FT-IR) spectrometer for in situ underwater pollution monitoring was designed, developed, and built in our research group. The assembled instrument is enclosed in a sealed aluminium pressure vessel and is capable of maintenance-free operation in an oceanic environment down to depths of at least 300 m. The whole system can be incorporated either in a tow
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47

Liestøl, Gunnar, Michael Bendon, and Elpida Hadjidaki-Marder. "Augmented Reality Storytelling Submerged. Dry Diving to a World War II Wreck at Ancient Phalasarna, Crete." Heritage 4, no. 4 (2021): 4647–64. http://dx.doi.org/10.3390/heritage4040256.

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Underwater heritage and archaeology is, in general, limited to the few who have permission, and the means to actually dive on location and experience the submarine sites. Dry dive technologies such as Augmented Reality (AR) now offer unprecedented opportunity to change this situation. This paper explores the use of AR storytelling with regard to a World War II landing craft at Phalasarna, Greece. Tank Landing Craft A6 (TLC) was sunk by German aircraft while evacuating Allied troops from Crete in 1941. Its remains still lie just off the coast in a few metres of water. This project revolves arou
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48

M R, Subash Chandrabose, Shan Victor Pereira, Jayakumar B, and Ebenezer D. D. "Metal Ceramic Segmented Ring Transducer under Deep Submergence Conditions." Defence Science Journal 67, no. 6 (2017): 612. http://dx.doi.org/10.14429/dsj.67.11201.

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<p class="p1">Segmented ring transducers are widely used for low frequency, broadband, deep submergence applications. These transducers can be made out of piezoceramic wedges or slabs and metallic wedges. Higher diameter, low frequency transducers are generally made out of piezoceramic slabs and metal wedges due to ease of manufacture and low cost. In this paper, metal ceramic segmented ring transducers are modelled using ATILA, a finite element software for the design of underwater transducers. Transducer variants were modelled with different wedge and piezoceramic materials. Transducer
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49

Klis, Pawel, Shuaishuai Wang, and Yihan Xing. "Technical and Economic Feasibility Analysis of a Conceptual Subsea Freight Glider for CO2 Transportation." Journal of Marine Science and Engineering 10, no. 8 (2022): 1108. http://dx.doi.org/10.3390/jmse10081108.

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This study analyses the technical and economic aspects of a novel subsea freight glider (SFG). The SFG is an excellent replacement for tanker ships and submarine pipelines transporting liquefied CO2. The main aim of the SFG is to ship CO2 from an offshore facility to an underwater well where the gas can be injected; as an advantage, the SFG vehicle may be used to transport all kinds of cargo. The SFG travels below the sea surface, making the vessel weather-independent. The research is divided into two steps. Firstly, the technical feasibility analysis is performed by designing a baseline desig
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50

Fang, Yin-Ying, Chi-Fang Chen, and Sheng-Ju Wu. "Feature identification using acoustic signature of Ocean Researcher III (ORIII) of Taiwan." ANZIAM Journal 59 (July 25, 2019): C318—C357. http://dx.doi.org/10.21914/anziamj.v59i0.12655.

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Underwater acoustic signature identification has been employed as a technique for detecting underwater vehicles, such as in anti-submarine warfare or harbour security systems. The underwater sound channel, however, has interference due to spatial variations in topography or sea state conditions and temporal variations in water column properties, which cause multipath and scattering in acoustic propagation. Thus, acoustic data quality control can be very challenging. One of challenges for an identification system is how to recognise the same target signature from measurements under different te
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