Question

When the pitching of ship is upward the effect of gyroscopic couple is to?

Answer 1

When the rotor rotates in the anticlockwise direction, when viewed from the stern and the ship is steering to the left, then the effect of reactive gyroscopic couple will be to lower the bow and raise the stern. When the ship is steering to the right under similar conditions, then the effect of reactive gyroscopic couple will be to raise the bow and lower the stern.

Answer 2

Answer:

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be to move the ship towards star-board.

When the pitching of a ship is downward, the effect of gyroscopic couple, is to turn the ship towards port side.

Explanation:

Gyroscopic effect:

• Gyroscopic motion is the tendency of a rotating object to maintain the orientation of its rotation. A rotating object possesses angular momentum and this momentum must be conserved. The object will resist any change in its axis of rotation, as a change in orientation will result in a change in angular momentum.
• Whenever a rotating body changes its axis of rotation, a torque is applied on the rotating body. This torque is known as gyroscopic torque.
• Steering: It is the turning of a ship in a curve either to the right or to the left hand side while the ship moves forward.
• Pitching: It is the upward or downward angular movement of the ship in a vertical plane, about its transverse axis, from the horizontal position.
• Rolling: It is the sideway motion of the ship about its longitudinal axis.
• Now we shall discuss the gyroscopic effect in a ship during steering, pitching, and rolling.
• Steering is nothing but turning in a curve while the ship moves forward. During steering (left or right turn) of a ship, the rotor and propeller of the ship (which is spinning about its own axis) precess (changes the axis of spin).
• Due to this precession of the spin axis, the reactive gyroscopic couple is applied by the rotor shaft on the ship.
• It may be noted that effect of gyroscopic couple on a ship during steering is very much similar to that of an aeroplane taking turn to the left or right hand side.
• Thus the gyroscopic effect on the ship during steering may be obtained in the similar way as for aeroplane.