• David A. Harris


Silencers come in many shapes and sizes and most all of them can be classified into four types: reactive, dissipative, absorptive, and dispersive or diffusive. Reactive silencers do not use sound absorbing materials but instead employ geometric design principles. An example is the Helmholtz resonator. Absorptive silencers use conventional sound absorbing materials. Dissipative silencers utilize flow resistance to reduce flow velocity. Dispersive or diffusive silencers reduce noise by preventing its generation. By diffusing high-velocity turbulent gas flow to a lower velocity less turbulent flow, less noise is generated. Some silencers will combine the action of two or more of the four types within one envelope. Other functions such as water separation, filtering, spark arresting, or heat recovery may be integrated into the silencer as well (Figure 5-1).


Centrifugal Compressor Noise Control Sound Attenuation Helmholtz Resonator Active Noise Control 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • David A. Harris
    • 1
  1. 1.BLDG. & Acoustic Design CSLTS.Rolling Hills Est.USA

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