The exhaust system of an internal combustion engine has a number of functions, one of which is to reduce the noise of the waste gases as they are expelled from the engine to the atmosphere.
- The three basic exhaust noise mechanisms are:
- Exhaust orifice noise - this is the noise radiated from the duct as it opens into the atmosphere.
- Structure borne noise - this is the noise transmitted through the exhaust mounting system to the surrounding structure.
- Structural radiated noise - this is noise radiated from the outer surface of the exhaust system (pipes, catalysts and silencers).
See also: Exhaust Tailpipe, Shell Radiated Noise, Straight-Through Silencer, Vehicle Exterior Noise, Vehicle Noise.
Subjects: Engines Noise & Vibration