Exhaust Noise

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.

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Subjects: Engines Noise & Vibration