Dynamic Behavior of Semi-submerged Tension-moored Floating Structure with Pressurized Air-chamber and Wave Transformation

Abstract

This study is intented to investigate theoretically and experimentally the dynamic behavior of a semi-submerged rectangular floating structure with a pressurized air-chamber and wave transformation. The Dividing Region Method which is based on the linear wave theory is employed in order to evaluate the wave left-lettlection and transmission, the rolling, heaving and swaying motions and the tension force of mooring line. An air compression model is developed to evaluate the dynamic air pressure in the chamber, assuming the adiabatic change of the ideal gas state. Moreover, viscous resistance force is introduced to prevent the divergence of solution at resonant frequency in rolling motion. The numerical solution is in good agreement with the experimental values, except some small differences around the natural frequency of the floating body, which confirms the validity of the theory developed in this study.