Incipient Fault Analysis of Thruster Propellers from Offshore Operations
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M.S. Elbe Maru is the first of large merchant vessels of triple-screw propulsion ever built. This paper presents the results of investigations into her qualities on propulsion, propeller cavitation, behavior in waves and maneuverability, through model experiments and sea trials on the actual ship. The results indicate that the triple-screw ship was successfully designed, and the M.S. Elbe Maru has given good performances in the time since her completion.
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This chapter provides a general overview on how the ship-propulsor systems work together, and generates a road map for developing the necessary information on propulsor and hull-propulsor interaction. It provides the basic definitions of power and power ratios. The chapter discusses the advantages and disadvantages of propulsors. A major objective of the work of naval architects is to design a hull-propulsor system that accomplishes the transfer with the highest possible efficiency. Most vessels today are driven by marine propeller, water jet propulsion and Voith Schneider propeller (VSP). The most common propulsor is the marine propeller. Water jet propulsion might provide better efficiency as a marine propeller in high speed applications where the propeller is likely to experience significant cavitation. Voith Schneider propellers combine propulsion with steering. VSP can generate thrust in any direction, which gives the vessels their high level of maneuverability.
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The propulsion efficiency of cruise ship is an important indicator to measure the propulsion performance and reliability of cruise ship. This article is based on the self propulsion simulation method of the cruise ship propelled by podded propulsors in still water conditions. By analyzing the layout position of the podded propulsors on the cruise ship, the thrust spacing between the two podded propulsors, and the rotation direction of the propeller, the propulsion efficiency values of the cruise ship under fixed self propulsion points are compared, and optimization of the cruise ship's propulsion efficiency is achieved. Firstly, the cruise ship self propulsion simulation model is built based on STAR-CCM+ simulation software. Then, a single parameter influence analysis is conducted on the layout position, thrust spacing, and propeller rotation direction of the cruise ship's podded propulsors at the self propulsion point. Based on the flow field analysis results, the propulsion efficiency is explained and optimized. The research results show that the podded propulsor is in its initial position and the propeller rotates inward, resulting in the highest propulsion efficiency.
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Propulsor
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Open water
Propulsive efficiency
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Propulsor
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A series of self-propulsion tests of a catamaran design at
medium-speeds is proposed to study the influence of the
hydrodynamics at medium-speeds on the waterjet
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water. Due to size requirements of the model, a single
demihull is to be utilised in close proximity to the side
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therefore providing the acceptable blockage effects and
wave interference for the second demihull.
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The engineering translation of the aquatic animal propulsion systems and its appropriate application to marine vehicles help them to achieve movement with less power and hence resulting in the CO2 emission reduction. In this paper, the design of a robotic fish with pectoral and caudal fins, which operates at subsurface, is considered. The robofish body shape and fin geometrical parameters are also important with regard to the resistance and power aspects. Numerical studies are conducted with the robotic fish to determine its resistance in the bare hull and also for the case fitted with fins. Experimental studies carried out on a remotely operated surface ship with thunniform mode of fish propulsion, which operates at subsurface, are considered. Model tests are performed to analyse the propulsive performance of fishtail propulsion for the remotely operated surface ship in bollard pull condition and in self-propulsion mode.
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