Abstract
In this paper, it is shown that the slow drift force spectrum of a floating body, obtained from the exact quadratic transfer function, is flat in the low-frequency range of interest and can be written in the form S F = S F(0) + O( μ 2), where S F(0) can be computed from the known drift force coefficient in harmonic waves and the wave energy spectrum. It is also shown here that a special and normally used form of Newman's approximation for the exact quadratic transfer function has an error of the form [1+ O( μ 2)] at low frequencies.
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