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..., the motions of a floating system consist of a first-order component at the wave frequency (WF) and a second- order component at the low frequency (LF), and the two are coupled due to nonlinearities. Fourthly, the LF motion and the WF/LF line tensions are in general non-Gaussian processes, which make...

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... m the frequency domain and the low-frequency (LF) motions the time domain. The total motion is then found by some sort of summation described later in this paper. This summation procedure is not straight forward when the WF and LF motions are dependent. Another alternative is to compute all forces...