Noise solutions

silenceREvolution s.r.l. focus all their energies and resources on identifying the most appropriate solutions to the problem of exhaust noise.

There are three different ways in which noise is produced in a boat fitted with an engine:

  • Noise due to engine suction
  • Noise generated by the structure vibrating
  • Noise from the engines exhaust fumes


    Suction noise is generated by vortices, which occur due to friction between airflow and the shape of the suction pipes.
    In order to dampen these noises, solutions are adopted at engine level to reduce the complexity of the suction pipes; appropriate filters are also installed at the entrance to these, which also act as silencers.
    The sound waves generated by suction, which may increase in volume due to the sound box effect of the engine compartment, can also be dampened by lining the engine room with appropriate sound-insulating panels or by applying layers of suitable sound-absorbing materials.



    The engines in a boat generate noise caused by some of their components, or structures they are connected to, vibrating.
    To dampen down vibrations, special insulators are used to reduce vibratory motion before it reaches the frame and structural parts of the hull.
    Some highly effective mounts have been developed which take advantage of the anisotropic properties of certain materials, which resemble highly dense gelatines.
    An anti-vibration mount is installed between the engine and the shaft to reduce the vibrations transmitted from the engine to the propeller along the axis line.




    Even when the engine room is well insulated and vibration has been dampened, noise can still spread through the gas exhaust system.
    In order to reduce noise levels and at the same time the temperature of the exhaust gases, cooling water is injected into a special elbow where it is mixed with the exhaust gases.
    Lowering the temperature enables reinforced rubber exhaust pipes to be used, which are easier to install than steel piping.
    Moreover, specific GRP "wet" silencers can be mounted on the exhaust system in conjunction with suitable gas-water separators, especially in units fitted with generators.
    This solution puts an end to the sploshing noise made by cooling water as it is discharged overboard from the system during the night.


    Engine exaust noise