ASA S1.18 2018
$91.54
ANSI/ASA S1.18-2018 American National Standard Method for Determining the Acoustic Impedance of Ground Surfaces
| Published By | Publication Date | Number of Pages |
| ASA | 2018 | 58 |
None
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 13 | 1 Scope 2 Normative references |
| 14 | 3 Terms and definitions 4 Measurement method 4.1 Recommended geometries |
| 15 | 4.2 Time convention |
| 16 | 4.3 Measurement procedure 4.4 Ground and environmental conditions |
| 17 | 4.5 Determination of the normalized specific acoustic impedance ratio |
| 19 | 4.6 Procedure to determine best fit in Step 1 |
| 20 | 4.7 Minimization procedure for Step 2 |
| 21 | 5 Required instruments for measuring ground impedance outdoors 5.1 Sound source 5.2 Microphones 5.3 Calibration |
| 22 | 5.4 Sound level meter/analyzer 5.5 Miscellaneous 5.6 Configuration of measuring system 5.7 Wind speed 6 Measurement 6.1 Area of ground 6.2 Data collection |
| 23 | 7 Data reduction 7.1 Corrections 7.2 Experimental error |
| 24 | 8 Reporting 8.1 Introductory information 8.2 Documentation of the instrumentation 8.3 Meteorological data 8.4 Impedance values 8.5 Other observations |
| 25 | 9 Templates for obtaining normalized surface impedance model parameters 9.1 Templates for the one-parameter impedance model |
| 26 | 9.2 Templates for the two-parameter normalized surface impedance model |
| 33 | Annex A (informative) Worked examples of procedure A.1 Example 1: Cricket field at the Open University, UK |
| 38 | iv © Acoustical Society of America 2018 – All rights reserved A.2 Example 2: Institutional grass at the National Research Council, Canada |
| 42 | A.3 Example 3: University lawn at Oldenburgh in Germany |
| 46 | A.4 Example 4: Granite gravel road on U.S. Army Research Laboratory testing facility |
| 49 | Annex B (informative) Example impedance parameters B.1 One-parameter model B.2 Two-parameter model |
| 50 | Annex C (informative) Formulae for the complex sound pressure ratio |
| 52 | Annex D (informative) Mathematical functions |
| 54 | Annex E (informative) Software for deduction of surface impedance according to ANSI/ASA S1.18- 2018 |
| 55 | Bibliography |
