A third order Volterra modelling was used to calculate the nonlinear vertical hull girder loads in irregular head waves in two slender models with different degrees of bow flare. The first order and the required approximations of the second and third order frequency response functions were derived from systematical experiments in regular waves only. The comparison of time traces, power spectra and probability density functions with experiments in irregular waves showed a good agreement for both models. For the model with bow flare it was not possible to obtain the same degree of correspondence with the experiments using a linear or second order modelling.
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