The main producers of mechanically created noise and vibration are the engines, but there are also other sources, like the air conditioning, shaft-line, cargo handling and control equipment and mooring machinery.
But after some time microscopic defects appear and cause small pits to appear in the surface of the intake and the blades which set up eddies in the gas flow, resulting in loss of performance and vibrations.
Besides mechanical produced vibrations, other sources are caused by the motion of the sea, slamming of the vessel on the waves and water depth to mention just a few.
Noise generated on board ships and submarines can have far-reaching effects on the ability of the vessel to operate safely and efficiently.
Decisions are made about the engine and shaft, what kind of instruments and material can be used to reduce noise and vibrations throughout the vessel and what is the best way to implement these.
Advanced computer technology tries to simulate these vibrations under different ship conditions to provide an overview of weak spots.
To solve this, the solution is a double elastic suspension where the engine and alternator are mounted with vibration dampers on a common frame.
Lubrication of the joints, tightening of the bolts, good alignment of stern contour of the vessel, adjusting of variables following the weekly and monthly schedule are the most effective routes to noise and vibration control.