ASA S12.54 2011
$96.96
ANSI/ASA S12.54-2011 / ISO 3744:2010 (R2016) American National Standard Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure – Engineering methods for an essentially free field over a reflecting plane (a nationally adopted international standard). This standard replaces ANSI S12.34-1988
| Published By | Publication Date | Number of Pages |
| ASA | 2011 | 100 |
None
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 15 | 1 Scope 1.1 General 1.2 Types of noise and noise sources 1.3 Test environment |
| 16 | 1.4 Measurement uncertainty 2 Normative references 3 Terms and definitions |
| 23 | 4 Test environment 4.1 General 4.2 Criteria for background noise |
| 26 | 4.3 Criterion for acoustic adequacy of test environment |
| 27 | 5 Instrumentation 5.1 General 5.2 Calibration 6 Definition, location, installation, and operation of noise source under test 6.1 General 6.2 Auxiliary equipment |
| 28 | 6.3 Noise source location 6.4 Mounting of the noise source |
| 29 | 6.5 Installation and mounting conditions for moving noise sources 6.6 Operation of source during test |
| 30 | 7 Reference box and measurement surface 7.1 Reference box |
| 31 | 7.2 Measurement surface |
| 34 | 8 Determination of sound power levels and sound energy levels 8.1 Microphone positions on the measurement surface |
| 37 | 8.2 Determination of sound power levels |
| 40 | 8.3 Determination of sound energy levels |
| 42 | 8.4 Calculation of apparent directivity indices |
| 43 | 8.5 Calculation of apparent surface sound pressure level non-uniformity index 8.6 A-weighted sound power level and sound energy level 9 Measurement uncertainty 9.1 Methodology |
| 44 | 9.2 Determination of . omc 9.3 Determination of . R0 |
| 45 | 9.4 Typical upper bound values of . R0 |
| 46 | 9.5 Total standard deviation . tot and expanded measurement uncertainty U 10 Information to be recorded 10.1 General 10.2 Noise source under test |
| 47 | 10.3 Test environment ii © 2011 Acoustical Society of America—All rights reserved. 10.4 Instrumentation 10.5 Acoustical data |
| 48 | 11 Test report |
| 49 | Annex A (normative) Qualification procedures for the acoustic environment A.1 General A.2 Absolute comparison test |
| 50 | A.3 Determination of the environmental correction based on room absorption |
| 54 | Annex B (normative) Microphone arrays on a hemispherical measurement surface B.1 Microphone positions and additional microphone positions |
| 55 | B.2 Microphone positions for sources adjacent to two reflecting planes B.3 Microphone positions for sources adjacent to three reflecting planes |
| 56 | B.4 Measurement paths |
| 61 | Annex C (normative) Microphone arrays on a parallelepiped measurement surface C.1 Microphone positions for sources mounted on one reflecting plane |
| 62 | C.2 Microphone positions for sources adjacent to two or three reflecting planes |
| 72 | Annex D (informative) Microphone arrays on a cylindrical measurement surface |
| 76 | Annex E (normative) Calculation of A-weighted sound power levels and A-weighted sound energy levels from frequency band levels E.1 A-weighted sound power levels E.2 A-weighted sound energy levels E.3 Values of k and Ck for use in calculations |
| 79 | Annex F (normative) Alternative microphone array on a hemispherical measurement surface for direct measurements of A-weighted sound pressure levels F.1 General F.2 Microphone positions on the measurement surface |
| 82 | Annex G (normative) Sound power level and sound energy level under reference meteorological conditions |
| 84 | Annex H (informative) Guidelines on the development of information on measurement uncertainty H.1 General H.2 Considerations on the total standard deviation . tot H.3 Considerations on . omc |
| 86 | H.4 Considerations on . R0 |
| 95 | H.5 Combined standard uncertainty H.6 Measurement uncertainty based on reproducibility data |
| 96 | Bibliography |
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