ASA S1.26 2014
$80.17
ANSI/ASA S1.26-2014 American National Standard Methods for Calculation of the Absorption of Sound by the Atmosphere
| Published By | Publication Date | Number of Pages |
| ASA | 2014 | 54 |
None
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Reference atmospheric conditions 3.1 Composition 3.2 Atmospheric pressure and temperature 4 Attenuation coefficients owing to atmospheric absorption for pure-tone sounds 4.1 Basic expression for attenuation 4.2 Attenuation of sound pressure levels |
| 11 | 5 Calculation procedure for pure-tone attenuation coefficients 5.1 The variables 5.2 The formulae |
| 12 | 5.3 Computation of attenuation coefficients 5.4 Tabular values of attenuation coefficients 6 Accuracy of calculated pure-tone attenuation coefficients for various ranges of the variables 6.1 Accuracy of ±5 percent |
| 13 | 6.2 Accuracy of ±10 percent 6.3 Accuracy of ±20 percent 6.4 Accuracy of ±50 percent |
| 29 | 7 Calculation of attenuation by atmospheric absorption for wideband sounds analyzed by fractional-octave-band filters 7.1 Description of the general problem and calculation methods |
| 30 | 7.2 Pure-tone method to approximate band-level attenuation |
| 31 | 7.3 Combined wideband and pure-tone sounds 8 Application to room acoustics |
| 33 | Annex A (informative) Physical mechanisms for atmospheric absorption A.1 Absorption mechanisms and frequency dependence |
| 34 | A.2 Pressure dependence |
| 37 | Annex B (informative) Conversion of humidity data to molar concentration of water vapor B.1 Introduction B.2 Relative humidity B.3 Saturation vapor pressure |
| 38 | B.4 Dewpoint |
| 39 | ii © 2014 Acoustical Society of America– All rights reserved Annex C (informative) Effect of inhomogeneous, real atmospheres C.1 Introduction C.2 Variation with altitude |
| 40 | C.3 Local variation |
| 43 | Annex D (informative) General spectrum-integration method for calculating the attenuation by atmospheric absorption of wideband sounds analyzed by fractional-octave-band filters D.1 Introduction D.2 Case 1: Band sound pressure levels known at the source |
| 46 | D.3 Case 2: Band sound pressure levels known at a receiver location |
| 47 | D.4 Case 3: Adjusting measured sound pressure levels at a receiver location for differences in attenuation by atmospheric absorption resulting from different meteorological conditions along a sound-propagation path |
| 48 | Annex E (informative) Approximate method for calculating the attenuation by atmospheric absorption of wideband sounds analyzed by fractional-octave-band filters E.1 Introduction E.2 General approach |
| 49 | E.3 The variables E.4 The formula |
| 50 | E.5 General calculation procedure E.6 Application to stratified atmosphere |
| 51 | E.7 Application to room acoustics |
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