An acoustic filter element used to reduce sound pressure levels inside a duct.

There are three types of silencer:

  1. Absoptive silencer - uses absorptive material to reduce noise levels
  2. Reactive silencer - uses expansion and reactive acoustic filters to reduce noise levels
  3. Active silencer - use active noise cancellation that adds noise using a loudspeaker to cancel out noise

Straight-Through Silencer

A type of absorption silencer with a single perforated tube surrounded by sound-absorbing fibre. This results in a very low back pressure silencer, but at the same time only attenuates higher frequency noise.

See also: Acoustic Filter Elements, Exhaust System, Exhaust Tailpipe, Reactive Silencer, Straight-Through Silencer.

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Subjects: Mechanical Engineering Noise & Vibration