Stochastic wave inputs for extreme roll in near head seas

Abstract

An approach to generate the extreme value distribution of parametric roll in near head sea conditions is presented using a Design Load Generator (DLG), a process to approximate the extreme value distribution of a Gaussian random variable. Statistics of the roll amplitudes of a Joint High Speed Sealift (JHSS) concept hull calculated from the DLG and the Large Amplitude Motion Program (LAMP) are compared in Weibull space with the results from limited Monte Carlo simulations. The interpretation of the exposure period of the DLG results is included.