Simplified procedure for computing the absorption of sound by the atmosphere

Rickley, Edward J.; Fleming, Gregg G.; Roof, Christopher J.; John A. Volpe National Transportation Systems Center (U.S.)

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Simplified procedure for computing the absorption of sound by the atmosphere

2007-10-31
By Rickley, Edward J. ; Fleming, Gregg G. ; Roof, Christopher J.

[PDF-592.75 KB]

English

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Details:

Alternative Title:

Noise Control Engineering Journal
Creators:

Rickley, Edward J. ; Fleming, Gregg G. ; Roof, Christopher J.

Rickley, Edward J. ; Fleming, Gregg G. ; Roof, Christopher J. Less -
Corporate Creators:

John A. Volpe National Transportation Systems Center (U.S.)
Subject/TRT Terms:

[+]

Aircraft Noise Airport Noise Algorithms Atmosphere Atmospheric Absorption Certification Sound Absorption Sound Attenuation Standards
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):

Volpe Center
Main Document Checksum:

[+]

urn:sha256:025caa70e50c592ea86ef91657d81ac70d873efa579b3b96167fc9bacd93a198
Download URL:

https://rosap.ntl.bts.gov/view/dot/9810/dot_9810_DS1.pdf
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Simplified procedure for computing the absorption of sound by the atmosphere

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