The turbine rotor of a ship has a mass of 30,000 kg, a radius of gyration of 600

Question

The turbine rotor of a ship has a mass of 30,000 kg, a radius of gyration of 600 mm, and
rotates at 2400 rpm in a clockwise direction when viewed from aft(tail or stern of the ship).
The ship pitches (moves up and down) through a total angle of 15o, 7 ½ o above and 7 ½o
below the horizontal, the motion being simple harmonic and having a period of 12 s.
Fig. 1 shows a side view of the ship.
Determine i) the maximum gyroscopic couple on the holding down bolts on the turbine,
[186.5 kN m]
ii) the direction of yaw (the turning of ship or the correct course of the ship) as the
bow (front end of ship) rises.
[ The ship yaws to starboard, i.e. to the right looking forward of the ship]

Explanation / Answer

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