..., but diminishes as the coefficent of excess goes beyond 2.0. This may be seen as a justification for using the separability approximation instead of searching for a more elaborate analysis for the higher moments. 2. 2.1 Separability assumption Single-degree-of-freedom Consider the linear spring mass damper system...

... are considered. It is shown that a stability analysis based on the approximate solution of the strongly nonlinear ocean system can serve as an efficient predictor for the nonlinear behavior, thus reducing numerical search efforts for global instability and chaotic response regions. INTRODUCTION...