An Investigation of Rolling-Motion Reduction for a Box-Shaped Floating Body in Waves

Abstract

Several aspects of the rolling-motion reduction are discussed for a box-shaped floating body. A simplified formula to predict roll responses of the body in beam waves is given. The design philosophy to reduce rolling motion by exploiting the diagram of roll resonant amplitudes, that is derived from the simplified formula, are illustrated for the box-shaped floating body like a FPSO. Subsequently, the characteristics of the rolling motion of the floating bodies with anti-symmetric sections are investigated experimentally. It is proved the anti-symmetric floating bodies reduce the amplitudes of roll extremely for an incidence of beam waves.