Application possibilities of electric driven propulsion of multi-mode ships
Treść / Zawartość
The ship propulsion solution based on unconventional thrusters driven by electric motor s is most often applied for the multi-mode ships. These ships ought to have dynamic positioning system. It forces an application of a few thrusters (most often four, seldom more up to eight). Records from a number of multi-mode ships show a mean load of less than 40% of maximum load on the propulsion system. In other side the demand for electric energy of ship industrial part is large, more often than for the propulsion part. In that case the diesel-electric propulsion system application may be economical, because the electric energy generation for all ship 's purposes makes possible the main engines work on the optimum loads on lowest specific fuel consumption and allows them a long-term work on heavy fuels. For multi-mode ships like cable ships, suppliers, drilling vessels are convenient an application of unconventional thrusters with direct electric propulsion as well, especially for dynamic positioning systems. The efficiency of the thrusters is a predominant factor for the successful and economical operation. Forecasted development and rise of quantity of diesel-electric propulsion (it means with electrical transmission) would cause increased interest of unconventional thrusters. Ultimately they may revolutionize ship propulsion systems.
Bibliogr. 4 poz., rys.
-  Levander, O., New propulsion machinery solution for ferries, Wärtsilä Corporation 2006.
-  Levander, O., Combined Diesel-Electric and Diesel Mechanical Propulsion for a RoPax Vessel, Wärtsilä Corporation, Marine News - Wärtsilä Customer Magazine, Nr 3, December 2001.
-  Levander, O., Sipilä, H., Pakaste, R., ENVIROPAX ferries make promising progress, Marine News - Wärtsilä Customer Magazine Nr 1, 2005.
-  The Specialist Committee on Unconventional Propulsors. The Final Report and Recommendations to the 22nd ITTC.
-  Sasaki, N., The Specialist Committee on Azimuthing Podded Propulsion Report and Recommendations, ITTC Fukuoka 2008.
-  Rawson, K. J., Tupper, E. C., Basic Ship Theory. Ship Dynamics and Design, 5th Edition, B&H 2001.
-  DP III Flotel „Ice Maiden I”, Adams Offshore Services Limited, 2008.
-  Leavitt, J. A., Optimal Thrust Allocation in a Dynamic Positioning System, 2008.
-  Dietmer, D., Principal Aspects of Thruster Selection, Dynamic Positioning Conference, Houston 1997.
-  Steerable Thruster Solutions, Wartsila 2005.
-  VSP Brochure 2008.
-  Skandi Marstein Brochure, DOF 1996