Pages 235-242
Recently many studies on the elastic response behavour of very large floating structures have been done. Such a very large structure is relatively flexible compared with real floating structures like large ships. For estimating the dynamic response behaviour of the structure, it is important to consider the deflection wave propagation based on fluid-structure interaction analysis. In this study, in order to improve the overall response of a very long floating structure (about4600m×1000m), the effects of the axial force by mooring or towing, Tension Leg (TL) and the bending rigidity of the structure on dispersion relation of deflection wave propagation and frequency response are investigated. Firstly, dispersion relation of deflection wave propagation is derived on the analogy of liner water wave theory. Next, by using this dispersion relation, the effects of those on wave length (or dispersion relation) of deflection wave propagation are investigated. From these results, it is shown that the effects of TL in lower frequency zone than the characteristic frequency and bending rigidity in higher frequency zone than the characteristic frequency on deflection wave propagation and frequency response characteristics are remarkable.
