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Simplified procedure for computing the absorption of sound by the atmosphere

File Language:
English


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
  • 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.

  • Format:
    PDF
  • Collection(s):
  • Main Document Checksum:
    urn:sha256:025caa70e50c592ea86ef91657d81ac70d873efa579b3b96167fc9bacd93a198
  • Download URL:
  • File Type:
    Filetype[PDF - 592.75 KB ]
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