Abstract

In the first report, we have developed a new modal analysis method for estimating wave-induced motions of a mat-like very large floating structure (VLFS), and verified it by comparing the numerical results with the experimental ones with respect to the motion amplitudes of the elastic mode in head sea condition. Furthermore, we applied it to a large floating module, and investigated the motion performances of it and disturbance waves around it in head and quartering seas. Finally we showed the response amplitude operators of the first 10 modes in all heading waves with various wave lengths.In this paper, we deals with motion performances of two adjacent mat-like structures in waves which are assumed to be under construction of VLFS. We have applied our method to a Γ-shaped structure and a small rectangular-shaped structure which will be connected to construct VLFS in open seas. First, several lower eigenmodes of the Γ-shaped structure with a length of 600 m and a breadth of 120 m are evaluated. Then its motion responses and wave profiles around it are calculated. In the next place, we investigate the motion performances of the Γ-shaped structure and the small rectangularshaped structure which will be connected and wave profiles around them. Furthermore, we discuss the variations of vertical gap between them and rigidity effects of the structures on the motion performances of these structures in waves.

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