Numerical tools and experimental activities for the prediction of noise propagation on board superyachts

The Italian Classification Society, RINA S.p.A., is developing a new set of Rules regarding comfort conditions on board large motor-yachts. According to present owner requirements and technical enhancement, the new limit values will be more restrictive especially for yachts with more than 65 meter in length. In this perspective designers and shipyards should consider structure borne noise and vibration level as leading parameters since the earliest design stages. In this paper some numerical tools, which allow to predict noise propagation on board before sea trials are carried out, are presented. The reliability of the proposed tools has been tested by means of experimental activities for the evaluation of damping loss factor on the viscoelastic materials employed in different parts of the vessel such as floating floors and engine foundations.