Six Degree of Freedom Motions of Towed Ships in Short Crested Seas

摘要

The scope of this thesis is to investigate the vertical and horizontal plane motions of surface ships in close proximity towing in irregular waves. Strip theory calculations have been utilized in order to predict the hydrodynamic coefficients and wave exciting forces and moments in sway and yaw, heave and pitch. The appropriate matching conditions between the two ships are provided in terms of the resistance-speed characteristics of the leading ship. The two-parameter Bretschneider spectrum with a cosine-squared spreading function is used to model the sea state environment. An extensive set of parametric studies is presented in a wide variety of developing and decaying sea states.