Textos de Apoio (pdf)

Closing Remarks
In practice, the ship’s resistance will
frequently be checked against the results
obtained by testing a model of the ship
in a towing tank. The experimental tank
test measurements are also used for
optimising the propeller and hull design.
When the ship’s necessary power requirement,
including margins, and the
propeller’s speed (rate of revolution)
have been determined, the correct
main engine can then be selected, e.g.
with the help of MAN B&W Diesel’s
computer-based engine selection
programme.
In this connection the interaction between
ship and main engine is extremely important,
and the placing of the engine’s
load diagram, i.e. the choice of engine
layout in relation to the engine’s (ship’s)
operational curve, must be made carefully
in order to achieve the optimum
propulsion plant. In order to avoid overloading
of the main engine for excessive
running conditions, the installation of an
electronic governor with load control may
be useful.
References
[1] Technical discussion with
Keld Kofoed Nielsen,
Burmeister & Wain Shipyard,
Copenhagen
[2] Ship Resistance
H.E. Guldhammer and
Sv. Aa. Harvald, 1974
[3] Resistance and Propulsion of Ships,
Sv. Aa. Harvald, 1983
[4] Paint supplier “International
Coatings Ltd.”, 2003
[5] Fartygspropellrar och Fartygs Framdrift,
Jan Tornblad, KaMeWa Publication,
1985
Furthermore, we recommend:
[6] Prediction of Power of Ships
Sv. Aa. Harvald, 1977 and 1986
[7] Propulsion of Single-Screw Ships
Sv. Aa. Harvald & J.M. Hee, 1981
If a main engine driven shaft generator –
producing electricity for the ship – is installed,
the interaction between ship and
main engine will be even more complex.
However, thanks to the flexibility of the
layout and load diagrams for the MAN
B&W engines, a suitable solution will
nearly always be readily at hand.
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