ABSTRACT

In this article, the probability distribution of dynamic responses of turret moored FPSOs is closely studied and the effects of non-linearity on the response distribution and the extreme statistics are evaluated. For this purpose, sample data sets obtained from two experimental model tests studying the response of typical external turret mooring systems designed for deepwater and shallow-water conditions are utilized. The focus here is on the extreme statistics of the mooring leg tension and vessel horizontal offset. The probability distribution of measured data are estimated using commonly used distribution models of linear and non-linear random variables. Additionally, the application of three-parameter Rayleigh distribution model in estimating the probability distribution of linear and non-linear responses of turret-moored FPSOs is studied. The performance of these distribution models in representing the sample distribution and predicting extreme statistics is evaluated.

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