Journal articles: 'Propulsione navale'

1

Fribourg, Charles. "La propulsion nucléaire navale." Revue Générale Nucléaire, no. 2 (March 1999): 32–49. http://dx.doi.org/10.1051/rgn/19992032.

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Altosole, Marco, Ugo Campora, Michele Martelli, and Massimo Figari. "Performance Decay Analysis of a Marine Gas Turbine Propulsion System." Journal of Ship Research 58, no. 03 (September 1, 2014): 117–29. http://dx.doi.org/10.5957/jsr.2014.58.3.117.

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Marine propulsion plants are designed to be more and more efficient to minimize fuel consumption and pollution emissions. However, during the ship operating life, propulsion components and hull are characterized by a certain performance decay, responsible for a worse behavior of the overall propulsion plant. For this reason, the several propulsion components are periodically subjected to expensive maintenance works to restore, as far as possible, their original design characteristics. In the present study, the propulsive performance variation of a naval vessel, powered by a gas turbine as part of an innovative CODLAG system, is simulated and analyzed by means of a detailed and validated numerical code. A sensitivity analysis regarding the influence of the main components deterioration (gas turbine, propellers, and ship hull) on the overall behavior of the propulsion plant is carried out. Several speed profiles of the vessel have been analyzed in terms of the usual performance parameters (ship speed, engine power, and fuel consumption) as well as the pollution emissions of the gas turbine. The main aim of the work is to get useful information for the ship management and maintenance scheduling (condition-based maintenance).

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Lupchian, Mariana. "Influence of propulsion installation performance on travel efficiency." Technium: Romanian Journal of Applied Sciences and Technology 2, no. 7 (September 15, 2020): 50–53. http://dx.doi.org/10.47577/technium.v2i7.1644.

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This paper presents an analysis of exploitation parameters for naval propulsion plant at different operating regimes. For naval propulsion plant with internal combustion engines, is considered as independent variables which give its operating regimes. Functional parameters of analysis of navigational regimes considered representative of the operation of the ship. Propulsion of the ship is provided by a fixed pitch propeller that allows modification propulsion performance by adjusting a single parameter function: speed propeller.

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Lefer, Dominique. "Propulsion nucléaire et propulsion navale ou la maîtrise de deux dimensions." Revue Générale Nucléaire, no. 5 (September 2005): 55–58. http://dx.doi.org/10.1051/rgn/20055055.

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Nita, C. M., P. Bocanete, and I. C. Scurtu. "Experimental methods for determining the characteristic quantities of unconventional naval propellers." Technium: Romanian Journal of Applied Sciences and Technology 4, no. 8 (August 26, 2022): 56–63. http://dx.doi.org/10.47577/technium.v4i8.7265.

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Basin research involves the practical realization of the scale structure and the analysis of the results according to the studied models and working frequency. The obtained measurements are close in value to those of the numerical simulations, this confirming the numerical results obtained with Ansys Fluent. The analysis carried out on the non-conventional naval propulsion includes all the calculation elements to be able to expand the understanding of this type of propulsion to be able to find the most suitable ones for use in the naval field and not only. The research carried out in this paper presents numerous elements of analysis of the unconventional naval propulsion system. By plotting and validating the thrust functions for a blade, a complete analysis of how this propulsion works is achieved.

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Kluczyk, Marcin, and Andrzej Grządziela. "Vibration diagnostics of the naval propulsion systems." Zeszyty Naukowe Akademii Marynarki Wojennej, no. 1 (March 31, 2017): 15–29. http://dx.doi.org/10.5604/0860889x.1237619.

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The paper presents examples of vibration performances of the naval propulsion systems. It describes the methodology of preparation for measurement, used gauges and their restrictions. The necessity of synchronous measurements had been justified. The work contains also samples of analysis, to facilitate the reader with the components of amplitude-frequency spectra of naval propulsion systems. An overview of the existing normative documents had been presented. At the same time limitations of applying of them during technical monitoring of marine propulsion systems had been presented.

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Emmet, W. L. R. "ELECTRIC PROPULSION OF NAVAL VESSELS." Journal of the American Society for Naval Engineers 23, no. 1 (March 18, 2009): 106–25. http://dx.doi.org/10.1111/j.1559-3584.1911.tb03523.x.

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Altosole, Marco, Giovanni Benvenuto, Massimo Figari, and Ugo Campora. "Dimensionless Numerical Approaches for the Performance Prediction of Marine Waterjet Propulsion Units." International Journal of Rotating Machinery 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/321306.

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One of the key issues at early design stage of a high-speed craft is the selection and the performance prediction of the propulsion system because at this stage only few information about the vessel are available. The objective of this work is precisely to provide the designer, in the case of waterjet propelled craft, with a simple and reliable calculation tool, able to predict the waterjet working points in design and off-design conditions, allowing to investigate several propulsive options during the ship design process. In the paper two original dimensionless numerical procedures, one referred to jet units for naval applications and the other more suitable for planing boats, are presented. The first procedure is based on a generalized performance map for mixed flow pumps, derived from the analysis of several waterjet pumps by applying similitude principles of the hydraulic machines. The second approach, validated by some comparisons with current waterjet installations, is based on a complete physical approach, from which a set of non-dimensional waterjet characteristics has been drawn by the authors. The presented application examples show the validity and the degree of accuracy of the proposed methodologies for the performance evaluation of waterjet propulsion systems.

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Havard, Jean. "La maîtrise d'œuvre des réacteurs de propulsion navale." Revue Générale Nucléaire, no. 5 (September 1995): 353–55. http://dx.doi.org/10.1051/rgn/19955353.

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10

Stan, L. C. "Efficiency analysis of a four-stroke marine engine." Scientific Bulletin of Naval Academy XIV, no. 2 (December 15, 2021): 112–22. http://dx.doi.org/10.21279/1454-864x-21-i2-010.

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Conventional propulsion systems consisting of the main propulsion machine, transmission (axle line) and propeller fail to always meet all the conditions of flexibility, manoeuvrability and space requirements imposed on a modern naval propulsion system. The imposition of new, strict rules in shipbuilding and navigation has led to the emergence of new naval equipment, new propulsion systems that have changed the ship's arrangements for economic and efficiency reasons. The useful volume compared to the total volume of the ship is a good economic indicator that allows the analysis of the income and expenses of construction and operation of the ship. For example, following the analysis of the use of space on board passenger ships built in the last 50 years, the ratio between the volume intended for the propulsion installation and the total volume of the ship varies around an average of 11.3%, (between 8% and 17.5%, exceptionally reaching 22%).

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11

Iorgulescu, Dumitru. "Analysis of the adjustment of the speed of naval electric motors and its role." Scientific Bulletin of Naval Academy XXIII, no. 1 (July 15, 2020): 97–103. http://dx.doi.org/10.21279/1454-864x-20-i1-013.

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The paper presents the advantages and disadvantages of the electric propulsion and the speed adjustment of the electric motors used for it. Using the speed regulation methods of D.C. and C.A. motors, we analyze the role of physical size that appear in mathematical relations. The speed adjustment methods for three-phase asynchronous motors are: changing the number of pairs of poles; alteration the frequency of the supply voltage; turning of the slip that is realized by the variation of the rotor resistance and alteration of the supply voltage. The voltage alteration is only effective during the load operation. The speed control is analyzed by modifying the number of pairs of poles, adjusting the speed by changing the frequency of the supply voltage, adjusting the speed by modifying the supply voltage, and adjusting the speed by rheostat adjustment. The speed adjustment of synchronous motors can only be done by varying the frequency of the supply voltage or by changing the number of pairs of poles. The role of adjusting the speed of the electric motors in propulsions is presented .

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Nicolae-Silviu, POPA. "Review of electric propulsion for small boats/drones." Scientific Bulletin of Naval Academy XXIV, no. 1 (July 15, 2021): 122–29. http://dx.doi.org/10.21279/1454-864x-21-i1-015.

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Nowadays, electric propulsion is one of the main fields of research (whether we are talking about the automotive field or the naval field). This paper presents the electric propulsion used on small boats (drones): the advantages of using electric propulsion, storage mode and possible methods of obtaining electricity (renewable sources of electricity).

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13

Altosole, M., and Massimo Figari. "Effective simple methods for numerical modelling of marine engines in ship propulsion control systems design." Journal of Naval Architecture and Marine Engineering 8, no. 2 (December 30, 2011): 129–47. http://dx.doi.org/10.3329/jname.v8i2.7366.

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In the last year, the Department of Naval Architecture and Marine Engineering of Genoa University (now Department of Naval Architecture, Marine Technology and Electrical Engineering) collaborated to the design of the propulsion automation of two different naval vessels; within these projects the authors developed different ship propulsion simulators used to design and test the propulsion control schemes. In these time-domain simulators, each propulsion component is represented by a specific mathematical model, mainly based on algebraic and differential equations. One of the key aspects of the propulsion simulation is the engine dynamics. This problem in principle can be dealt with models based on thermodynamic principles, which are able to represent in detail the behaviour of many variables of interest (engine power and speed, air and gas pressures, temperatures, stresses, etc.). However, thermodynamic models are often characterized by a long computation-time and moreover their development usually requires the knowledge of specific engine information not always available. It is generally preferable to adopt simpler simulation models, for the development of which, very few kinds of information are necessary. In fact, for the rapid prototyping of control schemes, it is generally more important to model the whole plant (in a relatively coarse way) rather than the detailed model of some components. This paper deals with simple mathematical methods, able to represent the engine power or torque only, but they can be suitably applied to many types of marine engines in a straightforward way. The proposed simulation approaches derived from the authors’ experience, gained during their activity in the marine simulation field, and they are particularly suitable for a fast prototyping of the marine propulsion control systems. The validation process of these particular models, regarding a Diesel engine, a marine gas turbine and an electric motor, is illustrated based on the sea trials data and engine manufacturers’ data. Keywords: Dynamic simulation; marine engines performance; gas turbine; propulsion control. doi: http://dx.doi.org/10.3329/jname.v8i2.7366 Journal of Naval Architecture and Marine Engineering 8(2011) 129-147

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14

Froidurot, B., L. L. Rouve, A. Foggia, J. P. Bongiraud, and G. Meunier. "Magnetic discretion of naval propulsion machines." IEEE Transactions on Magnetics 38, no. 2 (March 2002): 1185–88. http://dx.doi.org/10.1109/20.996303.

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15

WILHELMI, GEORGE F., WILLIAM M. APPLEMAN, and FRANCIS T. C. LOO. "COMPOSITE SHAFTING FOR NAVAL PROPULSION SYSTEMS." Naval Engineers Journal 98, no. 4 (July 1986): 129–36. http://dx.doi.org/10.1111/j.1559-3584.1986.tb03464.x.

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16

Froidurot, B., L. L. Rouve, A. Foggia, J. P. Bongiraud, and G. Meunier. "Magnetic discretion of naval propulsion machines." Journal of Magnetism and Magnetic Materials 242-245 (April 2002): 1190–94. http://dx.doi.org/10.1016/s0304-8853(01)01301-4.

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17

Bilen, Branislav, Branka Bilen-Katic, and Marko Zerjal. "Some Naval Architectural Problems in Underwater Coal Mining." Marine Technology and SNAME News 31, no. 02 (April 1, 1994): 116–22. http://dx.doi.org/10.5957/mt1.1994.31.2.116.

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This paper presents a solution for a propulsion system that provides perfect speed control and maneuverability for a survey launch used in the process of underwater coal mining. First, mining aspects of coal exploitation are explained. There is also a brief technical description of a cutting wheel suction dredger, including specifications for dredging equipment. The important role of the survey launch in underwater mining procedures is outlined and technical specifications of an installed indirect diesel-hydraulic drive are given. A qualitative comparison between the diesel-hydraulic and the other conventional propulsion systems is made. Finally, some operating parameters of the diesel-hydraulic propulsion system are given through a number of diagrams recorded during trials.

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18

Vlad, Mocanu. "Matlab Simulink simulation of naval electric propulsion using synchronous motor fed from cycloconverter drive." Scientific Bulletin of Naval Academy XXIII, no. 2 (December 15, 2020): 231–38. http://dx.doi.org/10.21279/1454-864x-20-i2-032.

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The content of the paper presents the virtual construction of an electric propulsion system from the source to synchronous motor with variable speed which drives the propeller. The variable speed of the propeller is obtained by changing the frequency of the supply voltage produced by the cycloconverters (12 pulses). Electric propulsion system simulation with cycloconverter is made in Matlab Simulink, which highlights the characteristics of the synchronous motor used in naval propulsion.

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19

Quick, George. "SCREW PROPULSION FOR NAVAL AND MARITIME PURPOSES." Journal of the American Society for Naval Engineers 15, no. 3 (March 18, 2009): 637–66. http://dx.doi.org/10.1111/j.1559-3584.1903.tb03461.x.

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20

EICHINGER, BERNADETTE J. "NAVAL PROPULSION SYSTEMS WATER TREATMENT AND CONTROL." Naval Engineers Journal 97, no. 4 (May 1985): 133–37. http://dx.doi.org/10.1111/j.1559-3584.1985.tb01347.x.

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21

Anderson, H. G., and C. M. Ettles. "Contrarotating Journal Bearings for Naval Propulsion Systems." Tribology Transactions 35, no. 3 (January 1992): 509–15. http://dx.doi.org/10.1080/10402009208982149.

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22

King, J. H. "PROPULSION MACHINERY FOR NAVAL AND AUXILIARY SHIPS." Journal of the American Society for Naval Engineers 47, no. 4 (March 18, 2009): 578–612. http://dx.doi.org/10.1111/j.1559-3584.1935.tb01409.x.

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23

Pivet, Sylvestre, and Michel Houdayer. "Le RES : un réacteur expérimental pour la propulsion nucléaire navale." Revue Générale Nucléaire, no. 3 (May 2002): 54–58. http://dx.doi.org/10.1051/rgn/20023054.

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24

Whalley, Robert, and Alaa Abdul-Ameer. "Warship propulsion system control." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 10 (January 17, 2012): 2402–21. http://dx.doi.org/10.1177/0954406211434389.

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The modelling of a dual gas turbine, single-shaft transmission drive, for a naval propulsion system, is considered. Owing to the spatial dispersion of the arrangement, a distributed–lumped parameter approach to the dynamic analysis problem is necessary. This enables the relatively concentrated assemblies to be included as lumped, pointwise representations and the propulsion shaft to be incorporated as a dispersed inertia and stiffness element. A multivariable, least effort controller design strategy is employed to achieve the regulation required. The performance of the closed-loop system following reference input and load disturbances is evaluated and the drive shaft speed and twist angle response transients are computed.

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25

TURNER, JAMES J. "SELECTION OF DIESEL PROPULSION PLANTS FOR NAVAL VESSELS." Journal of the American Society for Naval Engineers 69, no. 3 (March 18, 2009): 485–89. http://dx.doi.org/10.1111/j.1559-3584.1957.tb03221.x.

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26

Rocca, Ralph J. Della, and John D. Stehn. "FFG7 Class Frigate and DD963 Class Destroyer Marine Gas Turbine Propulsion Systems Maintenance and Operational Training Facility." Marine Technology and SNAME News 22, no. 01 (January 1, 1985): 1–27. http://dx.doi.org/10.5957/mt1.1985.22.1.1.

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The need for a gas turbine training facility became apparent with the introduction into the U.S. Navy fleet of the first ships of the FFG7 Frigate and DD963 Destroyer Classes with gas turbine propulsion plants. This facility, constructed at the Great Lakes Naval Training Center, provides "hands-on" training for maintenance and operation of marine gas turbines and associated propulsion plant components and controls and their piping and electrical systems. The Navy intends to train at this facility approximately 1000 personnel per year in the use of their latest and newest propulsion plants. The design of the facility reproduces as closely as possible the existing machinery and control spaces of the two different classes of ships and integrates them into a single main building with the school and the mechanical equipment wings. This paper presents an overview of the need for well-trained, qualified naval personnel to man the expanding fleet of marine gas turbine propulsion systems, existing training facilities and the various stages in the development of the FFG7/DD963 Gas Turbine Maintenance and Operational Training Facility. In regard to the facility, the paper discusses the planning and managing of the project; development of the designs for the building and propulsion plants; construction of the building facilities and FFG7 plant; the fabrication, transportation and erection of the FFG7 within the building; and the testing and operation of the FFG7 plant since light-off. Major emphasis is given to the FFG7 plant since the DD963 plant is being reconsidered in conjunction with the CG47 upgrading and is awaiting a decision to proceed.

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Ion-Adrian, Gîrbă. "Contributions to the study of the behavior of gas turbine propulsion systems at changes in environmental for all operating parameters." Scientific Bulletin of Naval Academy XIX, no. 1 (July 15, 2018): 262–75. http://dx.doi.org/10.21279/1454-864x-18-i1-041.

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The paper encompasses the study of the evolution of the functional parameters (suction air mass flow rate, plant efficiency, etc.) of naval gas turbines propulsion systems at changes in environmental parameters. The operational parameters of a gas turbine propulsion system and their evolution in relation to the modification of the environmental status parameters have been highlighted by calculation. Another sensitive area in the operation of gas turbine installations is the transient operating modes (stopping, starting, accelerating and decelerating sequences of the installation), which were highlighted by determinating of operating parameters on board the ship.

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DOBREF, VASILE. "THE QUALITY FACTOR OF THE NAVAL M.H.D PROPULSION SYSTEM." Scientific Bulletin of Naval Academy 19, no. 1 (June 15, 2016): 202–5. http://dx.doi.org/10.21279/1454-864x-16-i1-035.

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Sedaghat, Ahmad, Mohammad Badri, Mohsen Saghafian, and Iman Samani. "An Innovative Treadmill-Magnus Wind Propulsion System for Naval Ships." Recent Patents on Engineering 8, no. 2 (October 21, 2014): 95–99. http://dx.doi.org/10.2174/1872212108666140530231724.

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30

Bae, Sung-Wook, Chin-Suk Hong, Weui-Bong Jeong, Young-Su Park, and Jae-Goo Bin. "Shock Resistance Analysis of a Propulsion Motor for Naval Vessels." Transactions of the Korean Society for Noise and Vibration Engineering 20, no. 12 (December 20, 2010): 1183–89. http://dx.doi.org/10.5050/ksnve.2010.20.12.1183.

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31

Faitar, C., L. Stan, and A. Nedelcu. "Considerations on economic and ecological analysis of naval propulsion systems." IOP Conference Series: Materials Science and Engineering 400 (September 18, 2018): 082011. http://dx.doi.org/10.1088/1757-899x/400/8/082011.

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32

JOHNSON, R. C., and J. W. SAWYER. "PLASTIC COVERS FOR PROPULSION GEARS ON U. S. NAVAL SHIPS." Journal of the American Society for Naval Engineers 67, no. 3 (March 18, 2009): 565–73. http://dx.doi.org/10.1111/j.1559-3584.1955.tb03128.x.

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33

Altosole, M., G. Benvenuto, M. Figari, and U. Campora. "Real-time simulation of a COGAG naval ship propulsion system." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 223, no. 1 (December 19, 2008): 47–62. http://dx.doi.org/10.1243/14750902jeme121.

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34

Moltz, James Clay. "Closing the NPT loophole on exports of naval propulsion reactors." Nonproliferation Review 6, no. 1 (December 1998): 108–14. http://dx.doi.org/10.1080/10736709808436740.

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35

Patsios, Charalampos, Minos E. Beniakar, Antonios G. Kladas, and John Prousalidis. "A Simple and Efficient Parametric Design Approach for Marine Electrical Machines." Materials Science Forum 792 (August 2014): 367–72. http://dx.doi.org/10.4028/www.scientific.net/msf.792.367.

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In this paper a parametric design procedure of electrical machines used in naval propulsion systems is developed. The algorithm uses a series of design characteristics i.e. the type of the machine, the winding configuration and key geometrical properties, as parameters and is implemented on MATLAB® script allowing for a straightforward incorporation with other development tools. Using the proposed algorithm, two of the most common machine configurations involved in marine electrical propulsion systems i.e. the Induction Motor and the Synchronous Permanent Magnet Motor, are designed and 2D finite element modeling and analysis is performed. MATLAB® is used to interact with the FEMM software package through ActiveX framework, allowing for a detailed calculation of the electromagnetic properties of the machines examined.

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Sava, Nichita, Liviu Moise, Daniela-Ioana Tudose, Costel Iulian Mocanu, and Eugen Gavan. "Shapes’ optimisation using numerical naval hydrodynamics of a Ro-Ro double ferry with electric propulsion to cross the Danube." Analele Universităţii "Dunărea de Jos" din Galaţi Fascicula XI Construcţii navale/ Annals of "Dunărea de Jos" of Galati Fascicle XI Shipbuilding 44 (December 3, 2021): 79–86. http://dx.doi.org/10.35219/annugalshipbuilding/2021.44.12.

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One of the crucial problems of the 21st century is pollution. Regarding a low carbon footprint, thorough research efforts are being made to minimise fuel gas emissions. Ships, through the powers established for propulsion and the fossil fuels used, are some of the most toxic human inventions. Scientist in many European countries and beyond are developing studies either to reduce emissions from propulsion engines or to design body shapes of ships with low forward resistance and to find electric propulsion solutions. This paper carries out studies of naval hydrodynamics to find body shapes that generate the lowest resistance to advance. Thus, using hydrodynamic observations and with the help of the NUMECA calculation program, two different hulls are studied in order to establish the optimal shape with the lowest forward resistance. Furthermore, acknowledging the limited aquarium of the inland waters, an important aspect to approach is the size of the waves as well as their length. In order not to cause damage to existing shores and facilities, the waves produced by the floating body must have minimum heights and wavelengths.

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Parsons, Michael G., David J. Singer, and Samuel J. Denomy. "Integrated Electric Plants in Future Great Lakes Self-Unloaders." Journal of Ship Production and Design 27, no. 04 (November 1, 2011): 169–85. http://dx.doi.org/10.5957/jspd.2011.27.4.169.

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The feasibility and potential benefits of using Integrated Electric Plants in future Great Lakes self-unloaders are evaluated. Integrated Electric Plants, the all-electric ships, utilize electrical propulsion motors and central station power generation that powers all propulsion, thruster, self-unloading equipment, and other ship service needs. Integrated Electric Plants have become the plant of choice in many recent naval vessels, cruise ships, high technology cargo vessels, and special purpose vessels, such as offshore supply and service vessels and icebreakers. This study considers arrangements, effects on cargo capacity, fuel usage, and environmental emissions in all operating modes, maintenance requirements, and manning. The comparison is made for two notional self-unloading bulk carriers: a 1000 ft Poe Lock maximum self-unloader and a 730 ft MacArthur Lock, Welland Canal, St. Lawrence Seaway maxi-mum self-unloader.

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Sagástegui, David, and Nain Ramos. "Multiphysics analysis of a pressurized water reactor for military ships." Ciencia y tecnología de buques 15, no. 29 (July 31, 2021): 9–19. http://dx.doi.org/10.25043/19098642.217.

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The naval industry has integrated the generation of energy through nuclear processes, due to the large amount of energy that is produced in these processes, for example, the ship NS OTTO HAHN, which used a propulsion plant with energy generated by a reactor of pressurized water (PWR), which operated under a nuclear fission process. Also, other examples are military ships and icebreakers. In order to know the energy contribution of this type of nuclear propulsion plants, this work carries out a multiphysics analysis of a PWR reactor, considering a turbulent behavior for the fluid that comes into contact with the uranium rods. Finally, the results of the fluid velocity fields along the fuel elements and the outlet nozzles are presented, as well as the temperature fields inside the reactor.

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V, Dobref. "Aspects of Optimizing the Magneto Hydrodynamic Naval Thrusters." Scientific Bulletin of Naval Academy XIX, no. 1 (July 15, 2018): 463–67. http://dx.doi.org/10.21279/1454-864x-18-i1-070.

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In this paper, the authors analyze several problems relating to the efficiency of an MHD thruster. In this regard have been defined, calculated and shown by graphs the propulsive efficiency as a function of the magnetic field flux density, used for different thruster sizes. Finally, it was draw the conclusions about the number of necessary thrusters for a maximal efficiency.

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40

Kim, So-Yeon, Sehwa Choe, Sanggi Ko, Sungmin Kim, and Seung-Ki Sul. "Electric Propulsion Naval Ships with Energy Storage Modules through AFE Converters." Journal of Power Electronics 14, no. 2 (March 20, 2014): 402–12. http://dx.doi.org/10.6113/jpe.2014.14.2.402.

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41

Alosa, Ciro, Giovanni Migliazza, Fabio Immovilli, and Emilio Lorenzani. "Reconfigurable Multi-Three-Phase Drive for Naval Rim-Driven Propulsion System." IEEE Transactions on Industry Applications 58, no. 2 (March 2022): 2075–87. http://dx.doi.org/10.1109/tia.2022.3142234.

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42

Kmen, F., and S. Macuta. "Study on the construction of the shaft used in naval propulsion." IOP Conference Series: Materials Science and Engineering 147 (August 2016): 012044. http://dx.doi.org/10.1088/1757-899x/147/1/012044.

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43

Cipollini, Francesca, Luca Oneto, Andrea Coraddu, Alan John Murphy, and Davide Anguita. "Condition-Based Maintenance of Naval Propulsion Systems with supervised Data Analysis." Ocean Engineering 149 (February 2018): 268–78. http://dx.doi.org/10.1016/j.oceaneng.2017.12.002.

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Felli, M., M. Falchi, and G. Dubbioso. "Experimental approaches for the diagnostics of hydroacoustic problems in naval propulsion." Ocean Engineering 106 (September 2015): 1–19. http://dx.doi.org/10.1016/j.oceaneng.2015.06.049.

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45

Samoilescu, Gheorghe, Dumitru Iorgulescu, Robert Mitrea, and Laura D. Cizer. "Analysis of Steering Gear Under the Requirements of Modern Navigation." International conference KNOWLEDGE-BASED ORGANIZATION 24, no. 3 (June 1, 2018): 70–77. http://dx.doi.org/10.1515/kbo-2018-0139.

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Abstract This paper presents aspects of the steering gear onboard a merchant ship by analyzing aft and bow systems based on automation and use of modern propulsion. The choice of the transverse propeller is based on several economic considerations (its price, consumption, efficiency, etc.), technical considerations (positioning, size, vibrations induced in the ship’s hull), and maneuverability considerations (the ship’s turning rate under the action of the propeller. Accordingly, the propulsion system can come in various sizes, power values, shapes of the tunnel, and can present fixed or variable pitch propellers. Depending on the maneuverability of the ship, the transverse propulsion is analyzed by taking into account two tests: the turning of the transverse propulsion system test in calm and windy weather, and the steering test. The automation system is designed to control and monitor the on-board operational systems and equipment, and it encompasses a wide range of control, monitor and alarm. The integrated navigational equipment includes the following sub-systems: navigation consoles, ship handling consoles, dynamic positioning consoles, anchoring and deck operations consoles, and propulsion system control consoles. The propulsion control system is especially dedicated to the propeller and thruster control system, resulting in a joint control system, and the cables are reduced in number since the communication lines are used in series. The mandatory condition for successfully solving the problem with the complex automation of naval installations and equipment is the construction of complex automatic control systems (ACS), consisting of: automated commands or remote controls, a system of collecting, processing and displaying information, as well as a system of control, fault detection and diagnosis

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Sharke, Paul. "Little Big El-Mo." Mechanical Engineering 123, no. 10 (October 1, 2001): 52–55. http://dx.doi.org/10.1115/1.2001-oct-1.

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This article reviews the arrival of commercial high-temperature superconducting (HTS) motors in the market. American Superconductor is concentrating its motor efforts on ship propulsion. The company has a contract with the US Navy’s Office of Naval Research to design and develop propulsion motors up to 33,500 hp. The big advantage of a superconducting motor aboard a ship is its small size, which frees up valuable square footage in the hull for the many other components needed in battle. Because superconducting motors will be about half the weight of their conventional counterparts, the efficiencies an assembly line brings to manufacturing suddenly open for many of them. Lighter, smaller designs also will translate to time saved in testing. Many of the technologies used in the 200-hp machine transferred to the 1000-hp unit, and many new techniques developed as well.

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Salas, Marcos, Cristian Cifuentes, Richard Luco, Astrid Santander, Gonzalo Tampier, Claudio Troncoso, and Federico Zilic. "Naval and Oceanic Engineering: more than Ships and Offshore." Ciencia y tecnología de buques 11, no. 22 (March 20, 2018): 9. http://dx.doi.org/10.25043/19098642.159.

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Traditionally, Naval and Oceanic Engineering has been focused on research in surface and submarine ships; and fixed and floating offshore structures. More than 90% of world trade is transported by sea, so it is not surprising that most research efforts have been focused on making merchant ships more efficient and safer. Something similar is happening in the offshore industry driven by the demand for energy. Despite the evident need to perform research in the traditional fields of Naval and Oceanic Engineering, new challenges have caused universities and research centers to tackle new fields of research. This paper presents some of the research and innovations developed at the Institute of Naval and Maritime Sciences (ICNM) of the Austral University of Chile (UACH). These new frontiers for research address problems as diverse as the capturing of energy from waves and currents [1], the development of structures and systems for aquaculture [2], the design of autonomous underwater vehicles [3], the use of solar energy for the propulsion of small boats [4] and the design of floating ports for remote areas [5].

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Scurtu, Ionut Cristian, and Valeriu Nicolae Panaitescu. "Turbulent Flow Numerical Simulation for Unconventional Propulsion." Revista de Chimie 70, no. 10 (November 15, 2019): 3508–11. http://dx.doi.org/10.37358/rc.19.10.7585.

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This paper presents mainly a new HPC/CFD numerical simulation for airflow around the rigid sail for Lupo90 boat in Constanta harbor conditions. The first part of the work displays the performed numerical simulation in turbulent flow based on the 3D sail. The presented model has high capacity of towing and it can be installed onboard existing ships. This is the result of the HPC (high performance computing) and CFD (computational fluid dynamics) which is a mixture of actual hardware and software at high level computing power applied to Lupo90 boat. All data for rigid sail is analyzed in a turbulent flow in commercial fluid dynamics ANSYS module CFX available at Naval Academy and the work was supported by Romanian Ministry of Defense. Sail performance studying in turbulent flow for the rigid sail onboard ships was always a huge computational difficulty and the HPC/CFD analysis available can solve tricky tasks. The most common unconventional systems are hybrid propulsion systems are using fossil fuel and wind energy, this type of HPC/CFD method for propulsion investigation is now implemented by craft constructor CirusPlast SRL.

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Lee, Dongkon, Kyung-Ho Lee, and Soon-Hung Han. "Intelligent Selection of Main Engine at the Preliminary Design Stage of Ships." Journal of Ship Production 11, no. 04 (November 1, 1995): 245–51. http://dx.doi.org/10.5957/jsp.1995.11.4.245.

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The propulsion system is one of the most complicated systems in a ship and its performance greatly depends on the selection of the main engine. Also, the propulsion system occupies a large portion of the total shipbuilding cost, as well as a large portion of the annual operating cost in fuel consumption. Selecting the right propulsion system is an important factor consideration for shipowners and designers. In the preliminary stage of ship design, the main engine is selected by a design expert and this usually is a difficult task for a novice designer. With the help of a design support system, efficiency in selecting the right engine can be increased. In this study, a knowledge-based system for engine selection which can be used in the preliminary design stage for a merchant ship has been developed. The knowledge base is constructed using heuristic knowledge acquired from design experts. Two databases of engine catalogs and of existing ships are also constructed. Various performance prediction modules of the domain of naval architecture are integrated with the knowledge bases and databases. To enhance the user interface, a graphical user interface (GUI) built upon the Motif widgets is adapted.

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Kluczyk, Marcin, Andrzej Grządziela, and Tomislav Batur. "Diagnostic Model of the Marine Propulsion System." Applied Mechanics and Materials 817 (January 2016): 57–63. http://dx.doi.org/10.4028/www.scientific.net/amm.817.57.

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Naval propulsion systems are characterized by a high degree of complexity within a single system and a large variation between the solutions applied to individual vessels. In this situation, issues relating to the comprehensive diagnostic is a serious problem. Diagnostics models are useful to made the this problem easier. It should be emphasized that it is impossible to develop a universal model correct for all types of vessels. The paper presents general guidelines for the creation of diagnostic models. The results of first stage of studies on diagnostic model covers unit equipped with a twin-engine twin-shaft drive system had been presented.Introduction Changes of technical state of the machine occur as a result of its response to changes in the energy emitted by them. If qualitative and quantitative parameters of this energy are known diagnostician after proper analysis is able to determine the technical condition of the machine. It can be concluded that the technical diagnostics is a test of object response to the impact of energy causing change of its technical condition [9]. As far as the destruction of the object model is concerned we find that the degree of wear of the machine is proportional to the energy dissipated from it.

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Journal articles on the topic 'Propulsione navale'

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