Transcript Electric Ship Propulsion

Azipod vs. shaftline propulsion
Carnival Cruise Line’s Fantasy class consists of eight sister ships
M/S Fantasy
Identical hull form
M/S Elation
six with
diesel-electric shaft line
and last two with
Azipods
21-July-2000 / Matti
Nuuttila
Azipod vs. shaftline propulsion
Sea trial experiences of M/S Elation
…the final speed of the Elation at full power of 2×14 MW
was circa 0,55 knots higher than the mean value of corresponding
speeds of the previous six Fantasy-class ship…
…corresponds a reduction of circa 7,5 to 9 per cent in the
need of propulsion power to achieve original speed…
…typical cruise ship operation profile this reduction in power means a
fuel saving of circa 40 tons during one week.
From: Practical Design of Ships and Mobile Units
M.W. Oosterveld & S.G. Tan, editors.
21-July-2000 / Matti
Nuuttila
Mechanical vs. Diesel-Electric
transmission
Diesel-Electric
Mechanical
Prime mover
h = 0,36-0,43
h = 0,05-0,43
Prime mover
Generator
h = 0,95-0,97
h = 0,96-0,98
Reduction gear
Switch board
h = 0,995
h = 0,995
Shaft line bearings
Fq converter
h = 0,97-0,985
h = 0,995
Stern tube bearing
Propulsion
motor
h=
0,955-0,974
h=
0,945-0,975
Total propulsion
train
Ph
= 0,264-0,397
Ph
= 0,045-0,407
21-July-2000 / Matti
Nuuttila
CP propeller
/FP propeller
Total propulsion
train
Azipod vs. other propulsion methods
50
h [%]
Optimal operation area
Azipods
Efficiency from diesel to propeller
45
Optimal operation area
mechanical drive
40
Azipod propulsion
four prime movers
optimized hull form
Azipod propulsion
four prime movers
nonoptimized hull form
25
Diesel-electric propulsion
four prime movers
Mechanical propulsion
one prime mover
P [%]
10
21-July-2000 / Matti
Nuuttila
50
60
100 [MCR]
Constructional Benefits
– Simplified steel
structure
– No aligning of shafts
and bearings
– One-lift installation of
the Azipod unit
– Building time in drydock is reduced
21-July-2000 / Matti
Nuuttila
Operational Benefits
Manoeuvring
– Good coursekeeping stability
– Short crash stop distance
– Small turning circle
21-July-2000 / Matti
Nuuttila
Increased side thrust capacity
Manoeuvring
– Excellent for dp- and joystick
operation
– Safer and faster harbour
operations
– Reduced power demand for
manoeuvring
Stern
thrusters
Rudders
Flap
rudders
Azipods
Total transverse thrust with 3 MW
21-July-2000 / Matti
Nuuttila
Reduced exhaust emissions
Environmental Aspects
– Reduced exhaust emissions
– Improved safety of
navigation through
redundancy and excellent
steerability
21-July-2000 / Matti
Nuuttila
Main Component lifetime
Propulsion Motor > 30 years
Thrust bearing > 100 000 hours
Propeller bearing > 100 000 hours
Shaft sealing system > 5 years
Main gear wheel > 30 years
21-July-2000 / Matti
Nuuttila
Simple
construction
gives
better
reliability