DIGITAL SIMULATION OF NONLINEAR RANDOM WAVES
S Guangwen · Ocean Engineering · 1990
Based on the theoretical solution of second order nonlinear random waves, a relationship between the second order nonlinear spectra and the linear spectra is presented in this paper, and a model which separats the linear spectra from the target spectra is set up by using nonlinear constrained optimization method.A theoretical model for digital simulation of nonlinear random waves is also given using Fast Fouries Transform algorithm for nonlinear random wave computation with a greatly shortened. According to the method which determines the amplitudes by separating the linear spectra from the target spectra, the disagreement between simulated spectra and target spectra is solved. The estimated spectra and statistic characteristics of simulated random waves are, also preliminarily analysed.