Identification of Quadratic Responses of Floating Structures in Waves

AuthorsTim Bunnik, René Huijsmans (MARIN), Yashiro Namba (National Maritime Research Institute of Japan)
Conference/JournalISOPE Conference, San Francisco
DateMay 1, 2006

A formulation for the estimation of the low frequency damping and the quadratic wave drift force transfer function will be presented in this paper. Synthesized time series of the waves and low frequency motions are analyzed. Parameters influencing the stochastical nature of the estimation of the quadratic transfer functions, such as length of time series, number of time segments and frequency resolution, will be discussed.From the simulated low frequency damping and the quadratic transfer function the input signals for the analysis will be reconstructed as a means for a quality check. In this paper two estimation methods will be discussed. One method based on cross-bi-spectral analysis and a method which is based on a minimization scheme involving the quadratic transfer coefficients and the reconstruction of the second order time series.

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