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

在本研究中，对位于awaji岛的大型浮式结构进行了波浪响应的长期现场测量。测量了系泊船舶的垂直弹性响应和水平运动，并与模拟值进行了比较。在频域上对垂向水弹性响应进行了比较，得到了较好的一致性。在考虑非线性系泊恢复力特性和记忆效应的情况下，对其水平运动进行时域模拟，在调整挡泥板间隙的情况下，得到了较好的结果。本文所给出的仿真基本上可以代表实测值；然而，考虑到多向不规则海况，进一步改进可能是必要的。然后，在2006财年，根据现场测量得到的流速和水压测量值，再现了多向不规则波。测量了系泊船舶的水平运动，并在频域与模拟值进行了比较。结果表明，考虑多向不规则波时，模拟得到的水平运动显著值与实测值吻合较好。

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.