Journal articles: 'Flipper propulsion (Marine engineering)'

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Muscutt, Luke E., Gareth Dyke, Gabriel D. Weymouth, Darren Naish, Colin Palmer, and Bharathram Ganapathisubramani. "The four-flipper swimming method of plesiosaurs enabled efficient and effective locomotion." Proceedings of the Royal Society B: Biological Sciences 284, no. 1861 (August 30, 2017): 20170951. http://dx.doi.org/10.1098/rspb.2017.0951.

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The extinct ocean-going plesiosaurs were unique within vertebrates because they used two flipper pairs identical in morphology for propulsion. Although fossils of these Mesozoic marine reptiles have been known for more than two centuries, the function and dynamics of their tandem-flipper propulsion system has always been unclear and controversial. We address this question quantitatively for the first time in this study, reporting a series of precisely controlled water tank experiments that use reconstructed plesiosaur flippers scaled from well-preserved fossils. Our aim was to determine which limb movements would have resulted in the most efficient and effective propulsion. We show that plesiosaur hind flippers generated up to 60% more thrust and 40% higher efficiency when operating in harmony with their forward counterparts, when compared with operating alone, and the spacing and relative motion between the flippers was critical in governing these increases. The results of our analyses show that this phenomenon was probably present across the whole range of plesiosaur flipper motion and resolves the centuries-old debate about the propulsion style of these marine reptiles, as well as indicating why they retained two pairs of flippers for more than 100 million years.

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Jun, Myoung-Jae, and Chang-Soo Han. "Development of a Bioinspired Underwater Robot Using a Single Actuator." Marine Technology Society Journal 51, no. 5 (September 1, 2017): 94–102. http://dx.doi.org/10.4031/mtsj.51.5.11.

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Abstract We propose a novel propulsion mechanism for an underwater robot inspired by the pectoral fins of a fish. This device is referred to as the “flipper.” The flipper is connected to a rotational motor, and its shape is similar to that of the real fish's fins. The flipper using the propulsion mechanism proposed in this study has 1 degree of freedom. We can control the test robot during forward motion as well as its direction-changing operation. The experimental test robot is composed of a flipper at the front of the robot's head, together with a body and a tail/vertical fin. The electronic components are installed into the body. The tail functions to maintain the horizontal/vertical balance of the robot. Forward propulsion is achieved through the rotation of the flipper. The robot's direction can be changed by repeated oscillation of the flipper in a direction opposite to that of the desired angle. Several experiments were performed to measure the thrust force of the experimental robot and its motion characteristics in a test water pool. The experimental results show that the proposed propulsion method is viable.<def-list> Nomenclature <def-item> <term> F T </term> <def> = Thrust </def> </def-item> <def-item> <term> F I </term> <def> = Inertia force </def> </def-item> <def-item> <term> F B </term> <def> = Buoyancy </def> </def-item> <def-item> <term> B V </term> <def> = Platform volume </def> </def-item> <def-item> <term> V target </term> <def> = Target speed </def> </def-item> <def-item> <term> ρ </term> <def> = Water density </def> </def-item> <def-item> <term> P </term> <def> = Flipper pitch </def> </def-item> <def-item> <term> D </term> <def> = Drag force </def> </def-item> <def-item> <term> C D </term> <def> = Drag coefficient </def> </def-item> <def-item> <term> A </term> <def> = Projection of the frontal area </def> </def-item> <def-item> <term> T </term> <def> = Effective power </def> </def-item> <def-item> <term> P m </term> <def> = Propeller power </def> </def-item> <def-item> <term> C M </term> <def> = Center of total body mass </def> </def-item> <def-item> <term> C B </term> <def> = Center of buoyancy </def> </def-item> <def-item> <term> C F </term> <def> = Center of flipper mass </def> </def-item> <def-item> <term> F DS </term> <def> = Restoring force </def> </def-item> <def-item> <term> g </term> <def> = Gravity </def> </def-item> <def-item> <term> Q </term> <def> = Motor torque at maximum revolutions per minute </def> </def-item> <def-item> <term> rps reasonable </term> <def> = Reasonable revolutions per second </def> </def-item> </def-list>

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Fish, Frank E., Paul W. Weber, Mark M. Murray, and Laurens E. Howle. "Marine Applications of the Biomimetic Humpback Whale Flipper." Marine Technology Society Journal 45, no. 4 (July 1, 2011): 198–207. http://dx.doi.org/10.4031/mtsj.45.4.1.

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AbstractThe biomimetic approach seeks technological advancement through a transfer of technology from natural technologies to engineered systems. The morphology of the wing-like flipper of the humpback whale has potential for marine applications. As opposed to the straight leading edge of conventional hydrofoils, the humpback whale flipper has a number of sinusoid-like rounded bumps, called tubercles, which are arranged periodically along the leading edge. The presence of the tubercles modifies the water flow over the wing-like surface, creating regions of vortex generation between the tubercles. These vortices interact with the flow over the tubercle and accelerate that flow, helping to maintain a partially attached boundary layer. This hydrodynamic effect can delay stall to higher angles of attack, increases lift, and reduces drag compared to the post-stall condition of conventional wings. As the humpback whale functions in the marine environment in a Reynolds regime similar to some engineered marine systems, the use of tubercles has the potential to enhance the performance of wing-like structures. Specific applications of the tubercles for marine technology include sailboat masts, fans, propellers, turbines, and control surfaces, such as rudders, dive planes, stabilizers, spoilers, and keels.

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Huang, Wei-Xi, Yihong Chen, Sangbong Lee, Yin Lu Young, and Moustafa Abdel-Maksoud. "Hydrodynamics of marine propulsion." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 18 (September 2019): 6291–92. http://dx.doi.org/10.1177/0954406219875287.

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Appleton, A. D. "Superconducting Marine Propulsion Power." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 206, no. 2 (May 1992): 73–82. http://dx.doi.org/10.1243/pime_proc_1992_206_014_02.

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Over the last 25 years a large amount of research and development has been undertaken on the application of superconductors to marine propulsion systems and a number of superconducting homopolar motors and generators were constructed between the mid 1960s and the early 1980s. The paper reviews this work and shows that the technology had almost reached the point where industrial exploitation could have commenced. The reason why these machines did not reach the market place is discussed together with the impact which the recently discovered higher temperature superconductors may have upon future developments. Reference is made to a new ship which has been constructed in Japan and which derives its thrust directly from electrical energy using superconducting magnets in an engine based upon magnetohydrodynamics (MHD). With the exception of the MHD ship and the programme in the United States all of the work on d.c. machines described in this paper has been carried out by or under the direction of the author.

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Han, Wei-shi, and Tao Liu. "A new marine propulsion system." Journal of Marine Science and Application 2, no. 1 (June 2003): 30–34. http://dx.doi.org/10.1007/bf02935572.

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Tangora, Michael. "The Future of Marine Propulsion: “Reading the Propulsion Crystal Ball”." Marine Technology Society Journal 47, no. 5 (September 1, 2013): 51–55. http://dx.doi.org/10.4031/mtsj.47.5.14.

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AbstractThe marine industry is headed into a period of uncertainty as both environmental restrictions and rising fuel prices simultaneously converge unlike any time in its past. Yet at the same time, innovations in propulsion solutions have allowed the industry to keep pace with demands thus far, as the demand signal continues for both efficient propulsion designs as well as lower overall emissions. The growing calls for environmental compliance, and its origins will be examined, as well as solutions that will reduce propulsion emissions. New regulations and fuels with lower sulfur content will require reconfiguration of the propulsion plants. This paper primarily discusses both the background of the challenges that the industry will be facing as well as available solutions. Both the marine industry as well as the military will be reviewed.

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Mrzljak, Vedran, Igor Poljak, and Jasna Prpić-Oršić. "EXERGY ANALYSIS OF THE MAIN PROPULSION STEAM TURBINE FROM MARINE PROPULSION PLANT." Brodogradnja 70, no. 1 (January 1, 2019): 59–77. http://dx.doi.org/10.21278/brod70105.

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Thaweewat, Nonthipat, Surasak Phoemsapthawee, and Varangrat Juntasaro. "Semi-active flapping foil for marine propulsion." Ocean Engineering 147 (January 2018): 556–64. http://dx.doi.org/10.1016/j.oceaneng.2017.11.008.

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Kinaci, Omer Kemal, Metin Kemal Gokce, Ahmet Dursun Alkan, and Abdi Kukner. "ON SELF-PROPULSION ASSESSMENT OF MARINE VEHICLES." Brodogradnja 69, no. 4 (September 1, 2018): 29–51. http://dx.doi.org/10.21278/brod69403.

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Sandberg, William C., and Donna M. Kocak. "Marine Propulsion and Design: Inspirations From Nature." Marine Technology Society Journal 51, no. 5 (September 1, 2017): 3–14. http://dx.doi.org/10.4031/mtsj.51.5.2.

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Figari, M., and M. Altosole. "Dynamic behaviour and stability of marine propulsion systems." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 221, no. 4 (November 30, 2007): 187–205. http://dx.doi.org/10.1243/14750902jeme58.

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Xiao, Nengqi, Ruiping Zhou, and Xiang Xu. "Vibration of diesel-electric hybrid propulsion system with nonlinear component." Journal of Vibration and Control 24, no. 22 (January 16, 2018): 5353–65. http://dx.doi.org/10.1177/1077546317753010.

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The lumped parameter method is used to model the components of a marine diesel-electric hybrid propulsion system. Modular modeling and five basic models of torsional vibration are used to establish the torsion of the diesel-electric hybrid propulsion system with a nonlinear components vibration mathematical model. In order to include the nonlinear parts of the marine diesel-hybrid propulsion shafting torsional vibration system characteristics, by combining the perturbation method with the advantages and disadvantages of the harmonic method, a perturbation-harmonic method is presented to solve the diesel-electric hybrid propulsion shafting free vibration characteristics. At the same time, the nonlinear vibration characteristics of the hybrid propulsion shaft system are calculated and analyzed using the incremental harmonic balance method. In order to verify the correctness of the theoretical method of hybrid propulsion system, the correctness of the vibration model and method is verified by carrying out actual tests on a 10,000-ton marine surveillance ship. In order to verify the mathematical model of the ship diesel-hybrid propulsion system and the correctness of the theoretical calculation method, the torsional vibration test is carried out by a strain gauge method for a 10,000-ton marine propulsion shaft. The correctness of the torsional vibration mathematical model and the calculation method is verified by comparing the torsional vibration test data and the theoretical calculation data of the ship propulsion shaft system, which provides the theoretical significance for the calculation and analysis of the torsional vibration of the ship propulsion shaft system.

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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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Legaz, María José, Sergio Amat, and Sonia Busquier. "Marine Propulsion Shafting: A Study of Whirling Vibrations." Journal of Ship Research 65, no. 01 (March 17, 2021): 55–61. http://dx.doi.org/10.5957/josr.05180022.

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Whirling vibration is an important part of the calculations of the design of a marine shaft. In fact, all classification societies require a propulsion shafting whirling vibration calculation giving the range of critical speeds, i.e., free whirling vibration calculation. However, whirling vibration is a source of fatigue failure of the bracket and aft stern tube bearings, destruction of high-speed shafts with universal joints, noise, and hull vibrations. There are numerous uncertainties in the calculation of whirling vibration, namely, in the shafting system modeling and in the determination of excitement and damping forces. Moreover, whirling vibration calculation mathematics is much more complex than torsional or axial calculations. The marine propulsion shaft can be studied as a selfsustained vibration system, which can be modeled using the Van der Pol equation. In this document, a new way to solve the Van der pol equation is presented. The proposed method, based on a variational approach without local minima extra to the solution, converges for whatever initial point and parameter in the Van der Pol equation.

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Kato, Naomi. "Median and Paired Fin Controllers for Biomimetic Marine Vehicles." Applied Mechanics Reviews 58, no. 4 (July 1, 2005): 238–52. http://dx.doi.org/10.1115/1.1946027.

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This paper reviews the studies on the kinematics, hydrodynamics, and performance of median and paired fin (MPF) in fish and biomimetic mechanical systems from the viewpoint of enhancing the propulsive and maneuvering performance of marine vehicles at low speeds. Precise maneuverability and stability at low swimming speeds by use of MPF propulsion seem to be advantageous in complex habitats such as coral reefs. MPF propulsion in fish consists of undulatory fin motion and oscillatory fin motion. The kinematics of MPF in fish and mechanical systems in both groups is discussed. Hydrodynamic models and experimental data of undulatory and oscillatory motions of MPF in fish and mechanical system are reviewed. Pectoral fin propulsion has two categories which represent biomechanical extremes in the use of appendages for propulsion: drag-based and lift-based mechanisms of thrust production. The hydrodynamic characteristics of the two mechanisms are compared. The performance of fish and vehicles with MPF is reviewed from the viewpoint of maneuverability. Especially, performance of a recently developed fish-like body with a pair of undulatory side fins, a model ship with a pair of ray-wing-type propulsors, and an underwater vehicle with two pairs of mechanical pectoral fins are discussed.

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Kambrath, Jishnu Kavil, Changwoo Yoon, Jose Mathew, Xiong Liu, Youyi Wang, Chandana Jayampathi Gajanayake, Amit Kumar Gupta, and Yong-Jin Yoon. "Mitigation of Resonance Vibration Effects in Marine Propulsion." IEEE Transactions on Industrial Electronics 66, no. 8 (August 2019): 6159–69. http://dx.doi.org/10.1109/tie.2018.2875658.

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Ding, Xu Guang, Shao Fen Lin, and Zi Kai Chen. "Development of Motor and Controller's Engineering Measurement System." Applied Mechanics and Materials 397-400 (September 2013): 1700–1704. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1700.

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As energy crisis, the ship with electric propulsion has been the mainstream development and application trends of shipping industry and the world's navies in the present world. In order to develop domestic marine electric propulsion system, the test platform of marine electric propulsion system which can simulate the ship operating condition is constructed; the physical simulation of ship load is realized; the no-load, loading and overloading test for motors are completed. In addition, the platform can also be used to do the test for onshore equipments-the construction machinery such as electric forklift. Finally, there is no similar production in the domestic by far.

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Vizentin, Goran, Goran Vukelic, Lech Murawski, Naman Recho, and Josip Orovic. "Marine Propulsion System Failures—A Review." Journal of Marine Science and Engineering 8, no. 9 (August 27, 2020): 662. http://dx.doi.org/10.3390/jmse8090662.

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Failures of marine propulsion components or systems can lead to serious consequences for a vessel, cargo and the people onboard a ship. These consequences can be financial losses, delay in delivery time or a threat to safety of the people onboard. This is why it is necessary to learn about marine propulsion failures in order to prevent worst-case scenarios. This paper aims to provide a review of experimental, analytical and numerical methods used in the failure analysis of ship propulsion systems. In order to achieve that, the main causes and failure mechanisms are described and summarized. Commonly used experimental, numerical and analytical tools for failure analysis are given. Most indicative case studies of ship failures describe where the origin of failure lies in the ship propulsion failures (i.e., shaft lines, crankshaft, bearings, foundations). In order to learn from such failures, a holistic engineering approach is inevitable. This paper tries to give suggestions to improve existing design procedures with a goal of producing more reliable propulsion systems and taking care of operational conditions.

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Hidalgo, Matheus C., and Fuad Kassab Junior. "Steady-State Sensitivities of Marine Propulsion Control Techniques." Journal of Control, Automation and Electrical Systems 32, no. 3 (March 16, 2021): 543–62. http://dx.doi.org/10.1007/s40313-021-00710-3.

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Montazeri-Gh, Morteza, and Seyed Alireza Miran Fashandi. "Modeling and simulation of a two-shaft gas turbine propulsion system containing a frictional plate–type clutch." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 2 (April 7, 2018): 502–14. http://dx.doi.org/10.1177/1475090218765378.

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A marine propulsion system is composed of several sub-systems that operate in a variety of energy fields. The propulsion power of a ship can be provided from a two-shaft gas turbine. In this article, the modeling of a two-shaft gas turbine and its associated sub-systems including gears, flexible couplings and clutch is considered. These components are connected in the form of a virtual marine propulsion system, which is based on the bond-graph approach. When a clutch is used in a propulsion system, discontinuities occur in the describing model, which leads to some challenging problems when performing computer simulations. The two main difficulties are the numerical stiffness and the variable model structure. In this research, the bond-graph method is adapted as the modeling framework in order to allow a constant system structure model that minimizes the stiffness problem. Next, simulation results of a two-shaft gas turbine are presented in the off-design condition and verified with experimental tests. These results demonstrate the acceptable accuracy of computer simulations. Also, the effects of clutch performance on the dynamics of the marine propulsion system are discussed.

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Krylov, V. V., and E. Porteous. "Wave-like aquatic propulsion of mono-hull marine vessels." Ocean Engineering 37, no. 4 (March 2010): 378–86. http://dx.doi.org/10.1016/j.oceaneng.2009.12.008.

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Vergara, Julio A., and Chris B. McKesson. "Marine Technology Nuclear Propulsion in High-Performance Cargo Vessels." Marine Technology and SNAME News 39, no. 01 (January 1, 2002): 1–11. http://dx.doi.org/10.5957/mt1.2002.39.1.1.

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It has been about 40 years since nuclear-powered merchant ships were seriously discussed in the naval architecture community. But recent developments in commercial shipping include bigger, faster, and more powerful ships, where nuclear propulsion may be an option worth considering. The development of advanced ship designs opens an opportunity for high-speed maritime transportation that could create new markets and recover a fraction of the high value goods currently shipped only by air. One of the vessels being considered is FastShip, a large monohull ship that would require 250 MW in 5 gas turbine-waterjet units. An estimate of the operation cost of FastShip reveals that its success relies heavily, among other things, on the fuel price, a single factor that comprises more than one third of the total operating costs. The alternative, a nuclear FastShip, would save, per trip, almost 5000 tons of exposure to fuel price fluctuation, and about half of this savings would further be available for additional cargo and revenues. Nuclear power results in a more stable operation due to the relatively constant low price of nuclear fuel. The nuclear power option is suitable for high-power demand and long-haul applications and a reactor pack could be available within the decade. A candidate design would be the helium-cooled reactor, which has been revisited by several nuclear reactor design teams worldwide. For the FastShip a suggested plant would consist of two modular helium reactors, each one with two 50 MW helium turbines and compressors geared to waterjet pumps, plus a single 50 MW gas turbine. This vessel becomes more expensive to build but saves in fuel, and still provides margin for cost, weight and size optimization. This paper discusses general characteristics of a FastShip with such a nuclear power plant and also highlights the benefits, drawbacks, pending issues and further opportunities for nuclear-powered high-speed cargo ships.

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French, C. D. "Generic optimised torque control of marine PM propulsion machines." Journal of Marine Engineering & Technology 1, no. 1 (January 2002): 29–36. http://dx.doi.org/10.1080/20464177.2002.11020161.

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Karaszewski, Zbigniew J., and Wilhelm F. Schaefer. "Marine Diesel Propulsion Plants for the U.S. Navy: Requirements for Geared Medium-Speed Engines." Marine Technology and SNAME News 28, no. 05 (September 1, 1991): 276–301. http://dx.doi.org/10.5957/mt1.1991.28.5.276.

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Economic considerations for reduced operational costs of U.S. Navy diesel ships and the experience of European operators with diesel propulsion can no longer be ignored. The operational characteristics of high-powered diesel engines, compared with those of the steam or gas turbines, as prime movers, is different with respect to the propulsion system balance of torque variations. Maintenance is also quite different when compared to that of turbine installations. From an engineering point of view it is essential to have well-defined criteria for achieving balanced main components and system design. The sudden turn of American operators—with predominant knowledge and confidence in steam or gas turbine propulsion design and operation—towards marine diesel plants could result in unacceptable operational scenarios of existing diesel ships and eventual abundance or long delay of diesel power plant applications in the United States. This paper provides a broader understanding and greater appreciation of the technical aspects governing the application, design and operation of a state-of-the-art diesel propulsion plant.

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Liu, Si Yuan, Yan Cheng Liu, Chuan Wang, and Jun Jie Ren. "Marine Asynchronous Propulsion Motor Parameter Identification Using Dynamic Particle Swarm Optimization." Advanced Materials Research 860-863 (December 2013): 2211–17. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.2211.

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This paper proposes a new application of dynamic particle swarm optimization (PSO) algorithm for parameter identification of vector controlled asynchronous propulsion motor (APM) in electric propulsion ship. The dynamic PSO modifies the inertia weight, learning coefficients and two independent random sequences which affect the convergence capability and solution quality, in order to improve the performance of the standard PSO algorithm. The standard PSO and dynamic PSO algorithms use measurements of the mt-axis currents, voltages of APM as the inputs to parameter identification system. The experimental results obtained compare the identified parameters with the actual parameters. There is also a comparison of the solution quality between standard PSO and dynamic PSO algorithms. The results demonstrate that the dynamic PSO algorithm is better than standard PSO algorithm for APM parameter identification. Dynamic PSO algorithm can improve the performance of ship propulsion motor under abrupt load variation.

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Banning, R., M. A. Johnson, and M. J. Grimble. "Advanced Control Design for Marine Diesel Engine Propulsion Systems." Journal of Dynamic Systems, Measurement, and Control 119, no. 2 (June 1, 1997): 167–74. http://dx.doi.org/10.1115/1.2801229.

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A new marine diesel engine propulsion control design procedure is proposed which is applicable to a wide range of marine vessels. This procedure combines linear optimal H∞ control methods with non-linear control techniques to address the propulsion system’s nonlinearity. Simulation results show that a tracking control system aimed at saving fuel and optimizing efficiency may be obtained which is applicable across all maneuvring regimes. This compares favorably with the situation in some operating scenarios where the use of the linear controller alone can result in poor performance or even instability.

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Mayr, Gerald, Vanesa L. De Pietri, Leigh Love, Al A. Mannering, Joseph J. Bevitt, and R. Paul Scofield. "First Complete Wing of a Stem Group Sphenisciform from the Paleocene of New Zealand Sheds Light on the Evolution of the Penguin Flipper." Diversity 12, no. 2 (January 26, 2020): 46. http://dx.doi.org/10.3390/d12020046.

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We describe a partial skeleton of a stem group penguin from the Waipara Greensand in New Zealand, which is tentatively assigned to Muriwaimanu tuatahi. The fossil includes the first complete wing of a Paleocene penguin and informs on previously unknown features of the mandible and tibiotarsus of small-sized Sphenisciformes from the Waipara Greensand. The wing is distinguished by important features from that of all geologically younger Sphenisciformes and documents an early stage in the evolution of wing-propelled diving in penguins. In particular, the wing of the new fossil exhibits a well-developed alular phalanx and the distal phalanges are not flattened. Because the wing phalanges resemble those of volant birds, we consider it likely that the wing feathers remained differentiated into functional categories and were not short and scale-like as they are in extant penguins. Even though the flippers of geologically younger penguins may favor survival in extremely cold climates, they are likely to have been shaped by hydrodynamic demands. Possible selective drivers include a diminished importance of the hindlimbs in subaquatic propulsion, new foraging strategies (the caudal end of the mandible of the new fossil distinctly differs from that of extant penguins), or increased predation by marine mammals.

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Annaz, Fawaz Yahya. "Technology transfer of aircraft actuation to marine and propulsion." Journal of Mechanical Science and Technology 21, no. 6 (June 2007): 950–54. http://dx.doi.org/10.1007/bf03027075.

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Stefanopoulou, Anna, and Roy Smith. "Maneuverability and smoke emission constraints in marine diesel propulsion." Control Engineering Practice 8, no. 9 (September 2000): 1023–31. http://dx.doi.org/10.1016/s0967-0661(00)00024-1.

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Xu, Yiyi, Pengfei Liu, Irene Penesis, and Guanghua He. "A panel method for both marine propulsion and renewable energy." Journal of Naval Architecture and Marine Engineering 16, no. 2 (December 19, 2019): 61–76. http://dx.doi.org/10.3329/jname.v16i2.35984.

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A computational hydrodynamics method was formulated and implemented as a tool from screw propeller propulsion to renewable energy performance prediction, design and optimization of horizontal axis turbines. As an example for tidal energy generation, a comparative analysis between screw propellers and horizontal axis turbines was presented, in terms of geometry and motion parameters, inflow velocity analysis and the implementation methodologies. Comparison and analysis are given for a marine propeller model and a horizontal axis turbine model that have experimental measurements available in literature. Analysis and comparison are presented in terms of thrust coefficients, shaft torque/power coefficients, blade surface pressure distributions, and downstream velocity profiles. The effect of number of blades from 2 to 5, of a tidal turbine on hydrodynamic efficiency is also obtained and presented. The key implementation techniques and methodologies are provided in detail for this panel method as a prediction tool for horizontal axis turbines. While the method has been proven to be accurate and robust for many propellers tested in the past, this numerical tool was also validated and presented for both tidal and wind turbines.

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Smith, D. L., and V. A. Stammetti. "Comparative Controller Design for a Marine Gas Turbine Propulsion System." Journal of Engineering for Gas Turbines and Power 112, no. 2 (April 1, 1990): 182–86. http://dx.doi.org/10.1115/1.2906159.

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Controller design for marine gas turbine systems should consider three measures of performance: transient control, steady-state accuracy, and disturbance rejection. This paper presents and compares two common types of controller design in terms of these measures. The goal of the controllers was shaft speed control. To meet this goal, a classical Proportional-plus-Integral controller was designed and compared to a modern Linear Quadratic Regulator design. The controllers’ performances were evaluated with respect to the three measures mentioned above, with disturbances being input as oscillations in shaft torque due to seaway cycling.

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Moss, Michael. "From Cannon to Steam Propulsion: The origins of Clyde marine engineering." Mariner's Mirror 98, no. 4 (January 2012): 467–88. http://dx.doi.org/10.1080/00253359.2012.10709024.

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Xu, Xiang, and Rui Ping Zhou. "Research on Torsional Vibration of Gear-Shafting System Based on an Extended Lumped Parameter Model." Advanced Materials Research 143-144 (October 2010): 487–92. http://dx.doi.org/10.4028/www.scientific.net/amr.143-144.487.

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In this paper, gear-shafting system dynamics theory has been introduced into the torsional vibration calculation of the marine propulsion shaft and the vibration equations of a marine gear-shafting system were established using the lumped parameter model by taking the gear-shafting system in marine propulsion shaft as the research object. In order to solve the problem of vibration equation, dynamic simulation has been done in MATLAB software, in which the natural frequency of the system has been obtained from the simulation curve by changing the input frequency, meanwhile, the conclusion that the gears pair comprehensive meshing error is independent of the system natural frequency has been achieved. Thus, the analysis method presented in this work is available for the torsional vibration calculation of the marine gear-shafting system.

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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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Talluri, L., D. K. Nalianda, and E. Giuliani. "Techno economic and environmental assessment of Flettner rotors for marine propulsion." Ocean Engineering 154 (April 2018): 1–15. http://dx.doi.org/10.1016/j.oceaneng.2018.02.020.

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37

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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Van Dine, Piet. "Manufacture of a Prototype Advanced Permanent Magnet Motor Pod." Journal of Ship Production 19, no. 02 (May 1, 2003): 91–97. http://dx.doi.org/10.5957/jsp.2003.19.2.91.

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Podded propulsion is prevalent in the marine industry. Podded propulsion systems provide many advantages to the ship owner, including increased propulsion efficiency and reduced construction cost. To evaluate the potential of a new pod configuration, a prototype machine was constructed and tested. This prototype machine was mainly constructed of composite parts. The propeller, housings, structural blading, motor canning, and fairings were constructed of composite materials. Composite materials were chosen as a cost saving, schedule reduction, performance enhancement, and as a technology demonstration. This paper will review the unit construction, and test results, focusing on the lessons learned for the composite part manufacture.

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Foteinos, Michael I., George I. Christofilis, and Nikolaos P. Kyrtatos. "Response of a direct-drive large marine two-stroke engine coupled to a selective catalytic reduction exhaust aftertreatment system when operating in waves." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 234, no. 3 (March 7, 2020): 651–67. http://dx.doi.org/10.1177/1475090219899543.

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Large two-stroke marine diesel engines are used as the prime mover in the majority of ocean going commercial vessels and are currently facing new stringent NOx emission reductions. Selective catalytic reduction is an aftertreatment technology which is able to reduce emitted NOx at allowable levels. In most marine applications, the selective catalytic reduction system is placed on the high pressure side of the turbine, due to limitations at the exhaust gas temperature at the inlet of selective catalytic reduction system. In this article, the operation of a large two-stroke marine diesel with a selective catalytic reduction aftertreatment system, is investigated in heavy weather conditions. Operation of a vessel in heavy weather results in increased ship resistance, wave-induced ship motions, and a highly varying flow field in the propeller due to ship motions. This results in a fluctuation of propeller demanded torque and hence a fluctuation in engine load and exhaust gas temperature which may affect engine and selective catalytic reduction performance significantly. To investigate this phenomenon and taking into account the engine–propeller interaction, the entire propulsion system was modeled, namely the propulsion engine, the high pressure selective catalytic reduction system, the directly driven propeller, and the ship’s hull. A propeller model was employed to simulate the transient propeller torque demand and torque fluctuations due to ship motions. A three-dimensional six degrees of freedom panel code was used to calculate ship motions and wave added resistance in regular waves. The coupled model of the marine propulsion plant was validated against available measured data from a ship-board propulsion system on good weather conditions. The model was then used to simulate the behavior of the system during transient loading conditions in the presence of regular waves.

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YOSHIHARA, Hidehiko. "The Status Quo and the Future Problems of Marine Propulsion Gearing." Journal of the Japan Society for Precision Engineering 58, no. 8 (1992): 1290–92. http://dx.doi.org/10.2493/jjspe.58.1290.

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Jacob Jai Kumar, D. T. "Fuzzy Neural Network in Circumstance Maintanence for Marine Electric Propulsion System." Journal of Engineering and Applied Sciences 14, no. 1 (November 20, 2019): 3842–44. http://dx.doi.org/10.36478/jeasci.2019.3842.3844.

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Zong-Yu Chang, Chao Deng, Jia-Kun Zhang, Zhan-Xia Feng, and Zhong-Qiang Zheng. "Propulsion Performance Analysis of Wave-powered Boats." International Journal of Engineering and Technology Innovation 10, no. 2 (April 1, 2020): 121–29. http://dx.doi.org/10.46604/ijeti.2020.4276.

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With the development of oceanographic research and marine environment protection, mobile marine platforms are applied for ocean observation for a long journey. Wave-powered boats are capable of applying wave motion to propel itself and make a long-duration survey. This paper presents the dynamics of the wave-powered boat under the excitation of the heave motion and pitch motion. Taking the wave-powered boat with double fins as an example, the heave and pitch motions of the boat are obtained by ANSYS-AQWA firstly. Then the relationship between propulsion performance and three factors, including wave height, wave period, and restoring stiffness of torsion spring, was analyzed through multibody dynamics software ADAMS. With the increase of sea state from level 1 to level 4 the average propulsion speed increased from 0.4m/s to 1.4m/s. Under the same wave height and period, with the increase of restoring stiffness of torsion spring from 0.0125N·m/deg to 0.3N·m /deg, the propulsion speed of the wave-powered boat increases first and then decreases, and there exists an optimum stiffness. Through the calculation it is found that when the restoring stiffness of torsional spring is increased from 0.025N·m /deg to 0.2N·m /deg with the sea state level 1 to 4, the wave powered boat has better propulsion performance.

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Mancuso, Jon R., and James H. Paluh. "Diaphragm Couplings Versus Gear Couplings for Marine Applications." Marine Technology and SNAME News 25, no. 04 (October 1, 1988): 281–92. http://dx.doi.org/10.5957/mt1.1988.25.4.281.

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The gear coupling has been in existence for over 50 years. As advances in marine propulsion have occurred, so have advances in gear couplings. There are many variables in gear couplings that can affect their characteristics, including tooth design, materials, and lubrication methods. All couplings react on connected equipment. A system designer must consider these reactions when designing a system. If a gear coupling is chosen, there are many characteristics which are difficult to predict; therefore, one must conservatively estimate the maximum forces and moments that can be anticipated. This usually will make the system rather large and heavier than may be required. The diaphragm coupling usually has more predictable coupling characteristics, which can make a designer's life easier. This paper compares the characteristics of diaphragm couplings versus the gear (dental) type couplings in marine applications. Applications of couplings for main propulsion and auxiliary equipment are discussed. The methods used to analyze the design and calculate the forces and moments generated by both the gear coupling and the diaphragm coupling are also provided. These analyses are used to show that the forces and moments generated by a diaphragm coupling are not only predictable, but are usually lower than those of a gear coupling. The paper shows that a diaphragm coupling can provide a more predictable, reliable alternative to the gear coupling for advanced marine applications.

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Hobday, J. S., and J. Havill. "A New Approach to Evaluating the In-Service Performance of Marine Gas Turbine Air Filters." Journal of Engineering for Gas Turbines and Power 110, no. 4 (October 1, 1988): 621–27. http://dx.doi.org/10.1115/1.3240181.

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Early work by the Naval Engineering Department of NGTE Pyestock, now RAE Pyestock, sought to define the Marine Aerosol through simple relationships between wind speed and aerosol size and distribution. Experience has shown the resulting Standard Aerosols to be unrepresentative of the actual conditions found in service. This paper describes a new approach using available ship and meteorological data and proven analytical techniques to generate a multivariable mathematical model of the Marine Aerosol embracing a wide envelope of operating conditions. It further describes how a simple model of a gas turbine air filter can be used in conjunction with the Marine Aerosol model and a model describing a ship propulsion system to predict the performance of the filter in terms of probable salt ingestion by the ship’s engines. This versatile design tool can be used for direct or comparative assessments of separator applications for marine gas tubine propulsion engines and generating sets.

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Vorkapić, Aleksandar, Radoslav Radonja, Karlo Babić, and Sanda Martinčić-Ipšić. "MACHINE LEARNING METHODS IN MONITORING OPERATING BEHAVIOUR OF MARINE TWO-STROKE DIESEL ENGINE." Transport 35, no. 5 (December 21, 2020): 462–73. http://dx.doi.org/10.3846/transport.2020.14038.

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The aim of this article is to enhance performance monitoring of a two-stroke electronically controlled ship propulsion engine on the operating envelope. This is achieved by setting up a machine learning model capable of monitoring influential operating parameters and predicting the fuel consumption. Model is tested with different machine learning algorithms, namely linear regression, multilayer perceptron, Support Vector Machines (SVM) and Random Forests (RF). Upon verification of modelling framework and analysing the results in order to improve the prediction accuracy, the best algorithm is selected based on standard evaluation metrics, i.e. Root Mean Square Error (RMSE) and Relative Absolute Error (RAE). Experimental results show that, by taking an adequate combination and processing of relevant sensory data, SVM exhibit the lowest RMSE 7.1032 and RAE 0.5313%. RF achieve the lowest RMSE 22.6137 and RAE 3.8545% in a setting when minimal number of input variables is considered, i.e. cylinder indicated pressures and propulsion engine revolutions. Further, article deals with the detection of anomalies of operating parameters, which enables the evaluation of the propulsion engine condition and the early identification of failures and deterioration. Such a time-dependent, self-adopting anomaly detection model can be used for comparison with the initial condition recorded during the test and sea run or after survey and docking. Finally, we propose a unified model structure, incorporating fuel consumption prediction and anomaly detection model with on-board decision-making process regarding navigation and maintenance.

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Sciberras, E. A., and R. A. Norman. "Multi-objective design of a hybrid propulsion system for marine vessels." IET Electrical Systems in Transportation 2, no. 3 (2012): 148. http://dx.doi.org/10.1049/iet-est.2011.0011.

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Halilbeşe, Akile Neşe, Cong Zhang, and Osman Azmi Özsoysal. "Effect of Coupled Torsional and Transverse Vibrations of the Marine Propulsion Shaft System." Journal of Marine Science and Application 20, no. 2 (June 2021): 201–12. http://dx.doi.org/10.1007/s11804-021-00205-2.

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AbstractIn this study, the coupled torsional–transverse vibration of a propeller shaft system owing to the misalignment caused by the shaft rotation was investigated. The proposed numerical model is based on the modified version of the Jeffcott rotor model. The equation of motion describing the harmonic vibrations of the system was obtained using the Euler–Lagrange equations for the associated energy functional. Experiments considering different rotation speeds and axial loads acting on the propulsion shaft system were performed to verify the numerical model. The effects of system parameters such as shaft length and diameter, stiffness and damping coefficients, and cross-section eccentricity were also studied. The cross-section eccentricity increased the displacement response, yet coupled vibrations were not initially observed. With the increase in the eccentricity, the interaction between two vibration modes became apparent, and the agreement between numerical predictions and experimental measurements improved. Given the results, the modified version of the Jeffcott rotor model can represent the coupled torsional–transverse vibration of propulsion shaft systems.

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Vulić, Nenad, Karlo Bratić, Branko Lalić, and Ladislav Stazić. "Implementing Simulationx in the Modelling of Marine Shafting Steady State Torsional Vibrations." Polish Maritime Research 28, no. 2 (June 1, 2021): 63–71. http://dx.doi.org/10.2478/pomr-2021-0022.

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Abstract Marine propulsion shafting systems are exposed to torsional vibrations originating from excitations in their prime movers and propellers. It is essential to analyse their steady state response in the earliest stage of ship design. The paper describes the implementation of SimulationX software based upon simulation modelling for these calculations. This software can be used either by the design office of the shipyard or by the classification society for verification within the plan approval phase. Some specifics of the input data preparation are briefly discussed. In addition, the simulation results depend on the modelling approach chosen. For these reasons, the real two-stroke Diesel engine ship propulsion system was chosen and several different models were implemented for system modelling. SimulationX calculation results are compared with those of two well-known and field-proven programs that use an analytical approach. Finally, the results are compared with the measurements performed on the actual newly built ship. Discussion reviews the selected SimulationX model, and its verification and validation in the case of engine cylinders with normal ignition.

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Godaliyadde, D., D. D. K. Godaliyadde, G. Phylip-Jones, Z. L. Yang, A. D. Batako, and J. Wang. "A Subjective Cost-Benefit Analysis Approach for Selecting Ship Propulsion Systems." Marine Technology Society Journal 42, no. 4 (December 1, 2008): 69–86. http://dx.doi.org/10.4031/002533208787157679.

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A ship propulsion system is the major contributor to the occurrence of Ship Hull Vibration (SHV), which can easily lead to marine tragedies. Wrongly selecting ship propulsion systems will also significantly increase ship owners' operational costs. Based on a hierarchical structure for modelling propulsion systems, a subjective novel cost-benefit criteria analysis approach is developed to select the most economical propulsion system with the consideration of vibration characteristics. The weights of all the criteria are estimated by utilising an Analytical Hierarchy Process (AHP) technique. All the quantitative criteria in the hierarchy are converted into the qualitative criteria by proposing a novel approach. Membership Functions (MFs) of continuous fuzzy sets are employed to estimate the fuzzy performance ratings of all the criteria. By taking into account fuzzy performance ratings of all the criteria, a fuzzy Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) decision matrix is constructed. Finally, the most economical propulsion system, with consideration of vibration characteristics, is selected using the fuzzy TOPSIS method. The results of this paper reveal that the fuzzy TOPSIS is suitable for propulsion system selection.

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Hansen, Jan Fredrik, Alf K�re �dnanes, and Thor I. Fossen. "Mathematical Modelling of Diesel-Electric Propulsion Systems for Marine Vessels." Mathematical and Computer Modelling of Dynamical Systems 7, no. 3 (September 1, 2001): 323–55. http://dx.doi.org/10.1076/mcmd.7.3.323.3641.

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Journal articles on the topic 'Flipper propulsion (Marine engineering)'

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