Numerical Estimation Of Roll Damping And Prediction Of Ship Motions Using Strip Theory

This paper consists of three parts. In the first part, predict of hydrodynamics based on linear strip theory (STF) for obtained the three dimensional added mass, damping and also the exciting forces and moments where Frank close-fit method is used to get the two dimensional hydrodynamic coefficients.In the second part of this paper we estimate damping coefficients with original Ikeda method and the new prediction method (proposed by Ikeda). Damping coefficient is broken down into various categories such as friction, wave making, eddy making, lift, and bilge keel. Influence of forward speed is also carried in this paper.In the last part we obtained the vertical motions such us heave and pitch motions for Wigley I and also horizontal motions such as sway, roll and yaw motions for a Crude Oil Carrier "Macoma" and compare all theoretical results with experimental results. The results obtained show good agreement with previous computational and experimental results. The method used is accurate, robust, very computationally and efficient. It is well suited to be used as a tool in ship design or as part of a path optimization model.