SHIPMO Seakeeping Predictions and Correlations

Experience with the strip theory-based numerical seakeeping performance prediction model SHIPMO is described with applications ranging from fast surface vessels to unconventional hull forms such as icebreakers. A brief history of the model's development, its salient features and examples of validations are given. Four comparisons between predictions and measurements from scale model tests are illustrated, along with limited comparisons against predictions of other standard seakeeping models. These include pitch and heave motions in head seas, unstabilized roll motions in beam seas, as well as motions in stern quartering seas. Correlations have been made both for regular as well as irregular waves. It is shown that regular wave pitch, heave and roll RAO's correlate well, while motions in irregular seas correlate to a lesser degree. Comparisons with other models show that SHIPMO predictions are as good as those from other established programs based on strip theory.