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Mufflers are typically installed along the
exhaust pipe of the engine. They usually contain a series of
baffles to absorb sound, although the majority of the noise
reduction is not through absorption but through destructive
interference in the muffler itself. The muffler accomplishes
this with a resonating chamber, which is specifically designed
such that opposite sound waves are likely to collide, canceling
each other out. They are a common piece of equipment on
automobiles, usually slung under the rear of a car, but many
diesel-powered semi trucks have large mufflers mounted
vertically behind the cab. |
