This document discusses marine power transmission systems. It describes how the transmission system transmits power from the ship's engine to the propeller, and how thrust from the propeller is transferred to move the ship. There are two main types of transmission: direct transmission, which uses a single shaft, and is suitable for low-speed diesel engines; and geared transmission, which uses gears to reduce the RPM of high-speed engines like medium and high-speed diesels, gas turbines, and electric motors. The document examines various prime movers, transmissions, and propulsor options used in marine transmission systems.

1. POWER TRANSMISSION SYSTEM
MARINE POWER PLANT LABORATORY
Dept. of Marine Engineering
Faculty of Marine Technology
Institut Teknologi Sepuluh Nopember
Surabaya 2017

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Types of
Marine Transmission System

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Marine Transmission
• The transmission system on a ship transmits
power from the engine to the propeller. It is
made up of shafts, bearings, and finally the
propeller itself.
• The thrust from the propeller is transferred to the
ship through the transmission system.

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Vs
Vs
RT
T : Thrust
(Gaya Dorong)
THP DHP SHP BHP
Efective Power
EHP
EHP : Effective Horse Power
THP : Thrust Horse Power
DHP : Delivered Horse Power
SHP : Shaft Horse Power
BHP : Brake Horse Power
EHP : the power we would have to
use to tow the ship without
propulsive system
THP : the power produced by
the propeller’s thrust
Power

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1. Direct transmission
PRIME MOVER
TRANSMISSION
1. Shaft
PROPULSOR

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• Direct transmission usually using diesel engine
as prime mover on ship. Types of diesel engine:
1. Low speed (60-150 RPM)
2. Medium speed (450-800 RPM)
3. High speed (1000-3000 RPM)
• The low speed diesel engine is reasonable for
marine direct transmission.

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2. Geared transmission
PRIME MOVER
TRANSMISSION
1. Shaft
2. Reduction gear
PROPULSOR

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• Application of geared transmission on ship if the
prime mover have high RPM, like diesel engine,
gas turbine, steam turbine, electric motor:
1. Medium speed diesel (450-800 RPM)
2. High speed diesel (1000-3000 RPM)
3. Gas turbine (> 1000 RPM)
4. Steam turbine (> 1000 RPM)
5. Electric motor (> 1000 RPM)

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Diesel charactheristics

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Criteria for choosing the prime mover:
1. Required horsepower
2. Weight
3. Space
4. Capital cost
5. Running costs
6. Ease of installation
7. Vibration
8. Noise and other signatures
9. Availability
10.The ship’s requirement for electrical power and heat
11.Reliability and maintainability
12.The ship’s requirement for maneuvering ability and/or for
slow-speed operation
3. Conclusion

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PRIME MOVER
1. Diesel engine
2. Steam turbine
3. Gas turbine
4. Electric motor
5. Combined
TRANSMISSION
1. Shaft
2. Gearbox
PROPULSOR
1. Propeller
2. Water jet

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PRIME MOVER
1. Diesel engine
2. Steam turbine
3. Gas turbine
4. Electric motor
5. Combined
Diesel engine:
1. Low speed
2. Medium speed
3. High speed
Electric motor:
1. Low speed (AC or DC)
2. Medium speed (AC or DC)
3. High speed (AC or DC)
Combined:
1. CODAD
2. CODOG
3. CODAG
4. COGOG
5. COGAG
6. COSAG
7. COGAS
Steam turbine:
1. Conventional (impuls
or reaction)
2. Nuclear (impuls or
reaction)
Gas turbine:
1. Single shaft
2. Double shaft

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PROPULSOR
1. Propeller
2. Water jet
Propeller system:
1. Fixed Pitch Propeller
2. Controllable Pitch Propeller
3. Integrated Propeller and Rudder
4. Adjustable Bolted Propeller
5. Azzimuth Thrusters
6. Contra-Rotating Propellers
7. Podded Propeller
8. Voith Schneider Propeller (Cycloidal
Propeller)
Water jet:
1. Impeller

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PROPELLER TYPES:
1. A-series
2. B-series
3. C-series
4. D-series

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24. THANK YOU