Evaluation and control of induced vibrations for a passenger car ferry

Abstract

The aim of this paper is to present some examples related to the evaluation of the level of the global forced vibrations and to highlight the possible vibration problems of the ship. The calculation of the vibration level is based on Lloyd’s Register’s guidelines and other international standards. The hull structure has been considered using 3-D global FEM model. The dynamic linear analysis (displacements, velocities and accelerations) has been performed by NX Nastran for Windows using FEMAP as interactive graphic software program, pre and postprocessor designed for calculation codes using the finite element method. The calculations have been performed for a passenger and vehicle ferry, double-ended vessel, with boarding ramps at both ends.