REVIEW OF EXPERIMENTAL DATA IN SUPPORT OF A PROPOSED NEW METHOD FOR COMPUTING ATMOSPHERIC ABSORPTION LOSSES

A new method for computing air absorption losses is being proposed by members of Working Group S1-57, Attenuation of Sound in Air, of the American National Standards Committee on Acoustics, for consideration by the Acoustical Society of America. This report presents a brief outline of this new method and a detailed comparison between experimental data and values predicted by the model in its present form. The results of this comparison may be used to support or to further revise the new method. This prediction method is based on a more accurate physical model of atmospheric attenuation than employed for previous prediction methods. In general, it shows good agreement for the normal range of atmospheric conditions with laboratory data and air-to-ground aircraft sound propagatin measurements when the latter are based on measured atmospheric conditions over the propagation paths. An improved data base is required for sound absorption at low frequencies, very low humidities, and at temperatures outside the range of 0 to 25C, before further major improvements in the proposed model at these extreme ranges can be made.

  • Corporate Authors:

    Wyle Laboratories

    128 Maryland Street
    El Segundo, CA  USA  90245

    Office of Noise Abatement

    400 7th Street, SW
    Washington, DC  USA  20590
  • Authors:
    • SUTHERLAND, L C
  • Publication Date: 1975-5

Media Info

  • Pagination: 95 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00093005
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: WCR-75-7 Final Rpt., DOT/TST-75-87
  • Contract Numbers: DOT-PS-40804
  • Files: NTIS
  • Created Date: Nov 18 1976 12:00AM