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Trans RINA, Vol 153, Part A1, Intl J Maritime Eng, Jan-Mar 2011 2.


3. 4.


1.2 1.4 1.6


0.2 0.4 0.6 0.8 1


0 0 0.2 0.4 0.6 0.8 Advance coefficient


Figure 15: Amplitude of torque on the propeller in waves, as the ratio of the values to those in calm water


10 15 20 25 30 35


0 5


0 0.2 Advance coefficient 0.4 0.6 0.8 1 1.2


Figure 16: Amplitude of horizontal component of moment on the propeller in waves, as the ratio of the values to those in calm water.


0 1 2 3 4 5 6 7 8 9


0 Figure 0.2 0.4 17: Amplitude of 0.6 Advance coefficient vertical component of


moments on the propeller in waves, as the ratio of the values to those in calm water


HS-2s-225mm HS-2s-170mm HS-2s-160mm FS-2s-160mm FS-2s-200mm


HS-2s-225mm HS-2s-170mm HS-2s-160mm FS-2s-160mm FS-2s-200mm


1 1.2


The trend is more pronounced in the head sea condition, with the load component amplitude reaching large values compared with those in calm water with no ship motion.


In the following sea case, the force fluctuations do not depend strongly on the wave amplitude.


Thrust and torque fluctuations do not show a strong dependency on the sea state


1.2 1.4 1.6 1.8


0.2 0.4 0.6 0.8 1


0 0 0.2 Advance coefficint 0.4 0.6 0.8 1


Figure 18: Amplitude of thrust on the propeller in waves , as the ratio of the values to those in calm water


HS-2s-225mm HS-2s-170mm HS-2s-160mm FS-2s-160mm FS-2s-200mm


0 1 2 3 4 5 6


0 0.2 0.4 0.6


HS-2s-225mm HS-2s-170mm HS-2s-160mm FS-2s-160mm HS-2s-200mm


HS-2s-225mm HS-2s-170mm HS-2s-160mm FS-2s-160mm FS-2s-200mm


0.8 Advance coefficient


Figure 19: Amplitude of horizontal components of force on the propeller in waves , as the ratio of the values to those in calm water


1


1.2


10 12 14 16


0 2 4 6 8


0 0.2 0.4 0.6 0.8 Advance coefficient 0.8 1


Figure 20: Amplitude of vertical components of force on the propeller in waves , as the ratio of the values to those in calm water


1 1.2


HS-2s-225mm HS-2s-170mm HS-2s-160mm FS-2s-160mm FS-2s-200mm


©2011: The Royal Institution of Naval Architects


A- 17


Kmz max /Kmz0


Kmy max/Kmy0 Kqmax /Kq0


Kfz max/Kfz0


Kfy max /Kfy0


KTMAX / KT0


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