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ANSI/ASA S1.18-2018 American National Standard Method for Determining the Acoustic Impedance of Ground Surfaces >
ANSI/ASA S1.18-2018 American National Standard Method for Determining the Acoustic Impedance of Ground Surfaces, 2018
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Measurement method
- 4.1 Recommended geometries
- 4.2 Time convention
- 4.3 Measurement procedure
- 4.4 Ground and environmental conditions
- 4.5 Determination of the normalized specific acoustic impedance ratio
- 4.6 Procedure to determine best fit in Step 1
- 4.7 Minimization procedure for Step 2
- 5 Required instruments for measuring ground impedance outdoors
- 5.1 Sound source
- 5.2 Microphones
- 5.3 Calibration
- 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
- 7 Data reduction
- 7.1 Corrections
- 7.2 Experimental error
- 8 Reporting
- 8.1 Introductory information
- 8.2 Documentation of the instrumentation
- 8.3 Meteorological data
- 8.4 Impedance values
- 8.5 Other observations
- 9 Templates for obtaining normalized surface impedance model parameters
- 9.1 Templates for the one-parameter impedance model
- 9.2 Templates for the two-parameter normalized surface impedance model
- Annex A (informative) Worked examples of procedure
- A.1 Example 1: Cricket field at the Open University, UK
- iv © Acoustical Society of America 2018 – All rights reserved A.2 Example 2: Institutional grass at the National Research Council, Canada
- A.3 Example 3: University lawn at Oldenburgh in Germany
- A.4 Example 4: Granite gravel road on U.S. Army Research Laboratory testing facility
- Annex B (informative) Example impedance parameters
- B.1 One-parameter model
- B.2 Two-parameter model
- Annex C (informative) Formulae for the complex sound pressure ratio
- Annex D (informative) Mathematical functions
- Annex E (informative) Software for deduction of surface impedance according to ANSI/ASA S1.18- 2018
- Bibliography [Go to Page]
