Semi-Submersible Heave Response Study Using Diffraction Potential Theory with Viscous Damping Correction

Abstract

This paper discussesthe numerical prediction of the semisubmersible’s
heave motion. In the previous study, it is observed
that the heave motion response predicted by diffraction potential
theory is over-estimated in the region where the heave motion is
dominated by damping. In this research, viscous damping is
included in the calculation to increase the heave damping
magnitude in motion equation. The wave force and added massof
semi-submersible is predicted by diffraction potential theory, only
the total damping is corrected by sum-up the linear damping from
diffraction potential theory with the proposed viscous damping.
The heave motion response obtained from the proposed numerical
method also compared to the data from the experiment. From the
comparison, it can conclude that involved of viscous damping in
the calculation will corrected a part of heave motion response
tendency and reduce the large over-predicted error of heave
motion response at the damping dominate.