NUMERICAL AND EXPERIMENTAL ANALYSIS OF THE DYNAMIC BEHAVIOUR OF LARGE YACHT SUPERSTRUCTURES

摘要

One of the most important aspect of superyacht design is represented by the comfort on board in terms vibration and noise performances. These characteristics have been recently the object of specific attention by most important Classification Societies which issued new rules and regulations for the evaluation of noise and vibration maximum levels. Such rules, usually named as "Comfort Class Rules", contain both the general criteria for noise and vibration measurement in various yacht areas, and maximum limit values which such measurements should fall into. Comfort Class Rules derive from the well known ISO Standard 2000 formulation, "Mechanical vibration-Guidelines for the measurement, reporting and evaluation of vibration with regard to habitability on passenger and merchant ships". In order to improve the comfort level onboard their superyachts, Azimut|Benetti Shipyards, in cooperation with the Naval Architecture Section of the DITEN Department of the University of Genova, decided to start a comprehensive investigation on the dynamic behaviour of superyacht structures. The first phase of this activity has been represented by a complete review of existing comfort rules of most important Classification Society, a synthesis of which is presented in this work. Then a case study developed on two different 60 meters superyachts, on which detailed FEM investigations have been carried out in order to investigate the dynamic behaviour of hull and superstructures. The results of modal and transient analyses are compared with a first series of experimental data gathered during the vessel construction.