Simplified procedure for computing the absorption of sound by the atmosphere
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Simplified procedure for computing the absorption of sound by the atmosphere

Filetype[PDF-592.75 KB]


  • English
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    Details:

    • Alternative Title:
      Noise Control Engineering Journal
    • Creators:
    • Corporate Creators:
      John A. Volpe National Transportation Systems Center (U.S.)
    • Subject/TRT Terms:
    • Resource Type:
      Journal
    • Geographical Coverage:
      United States
    • NTL Classification:
      AGR-IMPACTS-EnvironmentNTL-AVIATION-Aviation Energy and EnvironmentNTL-ENERGY AND ENVIRONMENT-Aviation Energy and Environment
    • Abstract:
      This paper describes a study that resulted in the development of a simplified

      method for calculating attenuation by atmospheric-absorption for wide-band

      sounds analyzed by one-third octave-band filters. The new method [referred to

      herein as the Volpe Method] utilizes the accurate pure-tone sound absorption

      algorithms of two published standards, the International Standard, “Acoustics-

      Attenuation of Sound During Propagation Outdoors-Part 1: Calculation of the

      Absorption of Sound by the Atmosphere,” ISO 9613-1 and, the American

      National Standard, “Method for Calculation of the Absorption of Sound by the

      Atmosphere,” ANSI S1.26-1995. The purpose of the study was to extend the

      useful attenuation range of the Approximate Method outlined in the ANSI

      document, and provide a basis for replacing the current Society of Automotive

      Engineers Aerospace Recommended Practice 866A, “Standard Values of

      Atmospheric Absorption as a Function of Temperature and Humidity” (SAE

      ARP 866A). TheVolpe Method was found to be useable to mid-band absorption

      levels up to 500 dB with errors of less than ±0.5 dB or ±5% (of mid-band

      attenuation levels) to 100 dB, and ±7% to 500 dB. © 2007 Institute of Noise

      Control Engineering.

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