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20
7.6 METHOD OF CALCULATIONS
Shaft power is calculated from the measured torque and the revolutions of the shaft.
Shaft power
∙
9.945
P
= Shaft power
[kW]
M =
Torque
[kNm]
n
= rotations per minute
[rpm]
Total energy is calculated from the integrating shaft power over time
Total energy
∆ ∙ ∆
E
= Total energy
[kWh]
The thrust quotient indicates the amount of thrust generated per MW propulsion power. The thrust
quotient is an indicator of propeller efficiency. Be aware that propeller thrust and ship speed influence
each other.
Thrust quotient
1000
T =
Thrust
[kN]
P
= Shaft power
[kW]
∙
Summary of Contents for PEM2
Page 23: ...23 17 DRAWINGS Drawing 1 0897 1056...
Page 24: ...24 Drawing 2 0815 2003...
Page 25: ...25 Drawing 3 0815 2004...
Page 26: ...26 Drawing 4 0815 2014...
Page 27: ...27 Drawing 5 0815 2008...
Page 28: ...28 Drawing 6 0815 2013...
Page 32: ...32 Revision 0616 Chapter 1 1 warning added Pictures photos numbered and section links added...