(a) Define any six types of ship motions. (6)
(b) In the context of ship stability, what does static stability refer to: (10)
(i) The ship's resistance to rolling in waves.
(ii) The ship's ability to return to equilibrium after a displacement without wave action.
(iii) The dynamic response of a ship in irregular seas.
(iv) The resistance to hull slamming.
Briefly justify your answer.
Reference Answer
### (a) Six Types of Ship Motions The six degrees of freedom for a ship's motion are categorized into linear (translational) and angular (rotational) motions. These motions occur about three perpendicular axes: the longitudinal axis (X-axis, fore and aft), the transverse axis (Y-axis, port and starboard), and the vertical axis (Z-axis, up and down). **1. Linear Motions (Translations):** * **Surging:** The linear longitudinal motion along the X-axis. This is the forward and backward movement of the ship, often caused by wave action or changes in propulsion.
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