Key configurations for design and fabrication of high speed offshore vessels
Master thesis
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http://hdl.handle.net/11250/182726Utgivelsesdato
2010Metadata
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Sammendrag
With the development of the Norwegian and the Barents seas and by advancing
the oil and gas industry further to the sea from the coastal line, the marine
industry requires a class of different purpose vessels to operate them at a pretty
large distance from the shore line. These vessels should also be capable of working
in the conditions of the specific and harsh weather in the Norwegian and the
Barents seas.
This report describes the opportunities and abilities of multihull vessels by
using examples of catamarans and trimarans. Examples of calculations of some
methods and practical analysis of the opportunities will be the results here.
In this report the opportunities and advantages of trimarans and catamarans
will be compared. Where trimarans, by keeping all advantages of catamaran
design (the larger deck area and cross-section stability), have a higher speed and
are less addicted to the impact from longitudinal rolling and they are more stable
on a water surface..
Multihulls are having a certain number of disadvantages, for example, water
impacts (during roll) to the area, where the beam connects to the hull (it is more
expressed for catamarans, because of the double hull structure and hulls connect
to each other by a cross-section beam), the weight of the hull increases, because
of the double or triple hulls, and there are difficulties during construction and
repair.
In this report "The elasto-dynamical theory of multihulls in nonlinear beam
sea" will be considered. Also will the features of the water’s resistance to the
motions of multihulls be studied. These are defined by the arrangement and
geometry of the underwater part of the hull and will be shown. By the calculation
of:
- the resistance of catamarans with a cruiser stern
- the resistance of a trimaran
- the resistance of a high-speed catamaran.
Furthermore, the most suitable propellers will be reviewed; and also some
calculations of the interaction coefficient of the screw propeller and the
catamaran's hulls and calculation of the propulsive quality of a catamaran in a still
water will be carried out.
This Thesis report describes the features and the opportunities of construction
of the given types of the vessels at shipbuilding plants of Ukraine. Examples and
data of the largest shipbuilding yards of Ukraine will be included. This report also
focuses on specifications and considerations of oceanographic and geographic
features of the Straits of Bosporus and Dardanelles for the opportunities of transportation from the Black Sea to the Mediterranean Sea through these Straits
Beskrivelse
Master's thesis in Offshore technology : subsea technology