An Investigation on Quantitative Prediction of Parametric Roll in Regular Waves

Since parametric roll is well known as one of the most dangerous phenomena which could lead to serious accidents due to large amplitude roll motion, a new Intact Stability code, which is under development at IMO, is required to cover this phenomena. To realize quantitative prediction of parametric roll, systematic forced roll motion tests were conducted to measure roll restoring variation and roll damping with relevant roll angle/amplitude up to 30 degrees. Then, a 3DOF numerical model based on nonlinear strip method is developed and compared with model experiment to validate its prediction accuracy and applicability as a direct assessment method towards the new Intact Stability code.