ISO 9053-2:2020
Acoustics — Determination of airflow resistance — Part 2: Alternating airflow method
This document specifies an alternating airflow method for the determination of the airflow resistance[5], [6] of porous materials for acoustical applications.
Determination of the airflow resistance based on static flow is described in ISO 9053‑1.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Equipment
6.1 General
6.2 Device for producing the alternating airflow
6.3 Sound measuring device
6.4 Vessel and measurement cell
6.5 Device for measuring the static pressure
6.6 Device for measuring the frequency of the piston
7 Test specimens
7.1 Homogeneity of test specimen
7.2 Shape
7.3 Dimensions
7.3.1 Lateral dimensions
7.3.2 Thickness
7.4 Number of test specimens
8 Test procedure
9 Uncertainty
10 Test report
Annex A (normative) Effective ratio of specific heats for air
Annex B (informative) Acoustic model of the flow
Annex C (informative) Calculation of uncertainty
Annex D (informative) Airflow resistance of perforated support
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Equipment
6.1 General
6.2 Device for producing the alternating airflow
6.3 Sound measuring device
6.4 Vessel and measurement cell
6.5 Device for measuring the static pressure
6.6 Device for measuring the frequency of the piston
7 Test specimens
7.1 Homogeneity of test specimen
7.2 Shape
7.3 Dimensions
7.3.1 Lateral dimensions
7.3.2 Thickness
7.4 Number of test specimens
8 Test procedure
9 Uncertainty
10 Test report
Annex A (normative) Effective ratio of specific heats for air
Annex B (informative) Acoustic model of the flow
Annex C (informative) Calculation of uncertainty
Annex D (informative) Airflow resistance of perforated support
Bibliography