Class 2 (2nd Engineer) SC&S 📅 Oct 2020

Exam Question

(a) Explain the concept of dynamical stability. (6)

(b) A ship of 5000 tonne displacement has three rectangular double bottom tanks; Tank A: 12m long and 16m wide; Tank B: 14m long and 15m wide; Tank C: 14m long and 16m wide.

Calculate the free surface effect for any one tank and state in which order the tanks should be filled when making use of them for stability correction. (10)

Reference Answer

(a) Dynamical Stability is defined as the amount of energy required to heel a ship from its upright equilibrium position to a specific angle of heel. It provides a measure of the vessel's stability by considering its behaviour in response to dynamic external forces , such as wind or waves.
The concept compares the heeling moment energy (from external forces) and the righting moment energy (from the ship's stability).
The ship will absorb the energy imparted by the heeling moment. If the righting energy is greater than the heeling energy, the ship will stabilize; otherwise, it may capsize.
Areas Under the Curve:

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