Evaluation and control of induced vibrations for a passenger car ferry
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.
. Bureau Veritas - Building and Operation of Vibration-Free Propulsion Plants and Ships, NR 207 SMS E, November 1987.
. DNV – Prevention of harmful vibration in ships, July 1983.
. The Society of Naval Architects and Marine Engineers - Guidelines for Prevention of Excessive Ship Vibration, November, 1980.
. ABS – Guidance Notes on Ship Vibration, April, 2006.