Francesco D., Enrico L.

The issue of comfort on board of passenger ships has became in the last years of paramount importance ; in this context the noise and vibrations control plays the leading role.At the sa me time the ship speed have increased and consequently the propulsion powers are higher and this evolution has been accompained by the decrement of the weight of the ship structure.In this situation the goal of maximizing comfort on board becomes crucial and characterizes significantly a good design.Fincantieri , drawing on exerience and data from previous ships, apply a sistematic and analytic approch to the task of minimizing vibration and noise.Computer simulations are carefully analized and compared with measurements from sea trials;supplier of the machinery are required to design their equipment to stringent specifications.The report analyses also one of the most important component of disturbance , that is to say the noise in the accomodation areas due to the entertainements noise.Sound on board is needed for passenger's entertainement purposes ; but while the physics of sound is the same of sound on earth, the problems that can arise are different due to the steel structure of the ship.Another frontier for the shipbuilders is represented by the acoustic pollution that concerns the ship external environment and therefore the control of noise spread in the air and in the water.