Speaker
Prof.
Valerio Ruggiero
(University of Messina)
Description
In Italy there is a large fleet of passenger ferries , this fleet is operating in a very special scenario: no matters if we talk about Internal waters like the lakes or the venetian lagoon or the islands in Gulf of Naples or the Sicilian islands, all those ferries must deal with port structures, often of historical interest, and environmental situations extremely particulars and requiring attention. In fact the ferries operating in those areas have the need to offer great manouvrability, silent running, low emissions or no emissions. For all those aspects the hybrid propulsion, combining the use of diesel electric generators and batteries offers the possibility to adopt efficient systems for manouvrability and propulsion, like azimuthal or azipodal propellers and battery packs to ensure silent approaching to the mooring facilities, the possibility to stay at night in port without generators working during the nocturnal stop, realizing a ship that close the areas of interest can operate with almost complete silence and no pollution.
All those advantages have an impact on the general layout of the project considering the necessity to respect the limitations in term of stability, with special attention to the damaged stability conditions.
The disposition and the subdivision must be adequated to the navigation requests, according to the range calculation performed considering the results of tank tests and the evaluation of the size batteries.
Furthermore the hybrid propulsion, as well knows, can be more “space demanding” in terms of installation, due to the need to install not only the diesel engine but also several components for the management of the propulsion system, and this has an impact on subdivision.
In conclusion the subject of the work is the case study of several project for ferries , different in size and typology, with hybrid propulsion, examining the fact that the request of maintaining the stability criteria and consequents choices of project, oblige the naval architect to a careful disposition of the subdivision and the work aims at underlining those aspects.
Primary author
Prof.
Valerio Ruggiero
(University of Messina)
