Long-term field measurement of a Very Large Floating Structure and development of a rational design method

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In this research, the long-term field measurement of wave response of a large floating structure located at Awaji-island was made. The vertical elastic response and the horizontal motion as a moored vessel have been measured, and compared with the simulated values. The vertical hydroelastic responses have been compared in the frequency domain, and a good agreement has been obtained. The horizontal motion has been simulated in the time-domain where the nonlinear mooring restoring force characteristics and the memory effect are considered, and also a good agreement has been obtained, if the clearances at the fenders are adjusted. Basically, the simulation presented in this paper can represent the measured values; however, further improvement to consider the multi-directional irregular sea-state may be necessary.Then, in FY 2006, the multi-directional irregular waves have been reproduced from the measurement values of current speed and water pressure obtained from the field-measurement. The horizontal motions as a moored vessel have been measured and compared with the simulated values in frequency domain. The results have shown that the significant values for the horizontal motions by the simulation agree well with the measured values, when the multi-directional irregular waves are considered.