Project Mohole Ship Motion Study

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Project Mohole Ship Motion Study

On the basis of the studies made, certain generalizations may be made: (1) For the normal ship form, pitching appears to provide the most severe response in fully developed storm seas; (2) For the normal ship form, unstabilized rolling will be the most severe motion in longer waves associated with swell; (3) For the normal form ship, heave will rarely be greater than the wave height and may be reduced in the 30 knot fully developed storm by altering heading; (4) For the normal form ship, increasing the length of the vessel will significantly reduce amplitudes of pitching without necessarily affecting the amplitudes of roll and heave, and by so doing will increase the length of time before operations must be suspended; (5) Passive roll stabilization can reduce roll amplitudes to below maximum permissible levels within specified wind conditions; (6) Anti-pitching fins at bow and stern will reduce amplitudes of motion but with the possible disadvantage of increasing heaving; (7) Unstabilized roll and pitch response of the 4-column platform will be low in normal storm condition, but may be significant in longer swells. (Author)