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ISO 10534-2:1998

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Acoustics — Determination of sound absorption coefficient and impedance in impedance tubes — Part 2: Transfer-function method
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Superseded date

06-10-2023

Language(s)

English, French

Published date

19-11-1998

This test method covers the use of an impedance tube, two microphone locations and a digital frequency analysis system for the determination of the sound absorption coefficient of sound absorbers for normal sound incidence. It can also be applied for the determination of the acoustical surface impedance or surface admittance of sound absorbing materials. Since the impedance ratios of a sound absorptive material are related to its physical properties, such as airflow resistance, porosity, elasticity and density, measurements described in this test method are useful in basic research and product development.

The test method is similar to the test method specified in ISO 10534-1 in that it uses an impedance tube with a sound source connected to one end and the test sample mounted in the tube at the other end. However, the measurement technique is different. In this test method, plane waves are generated in a tube by a noise source, and the decomposition of the interference field is achieved by the measurement of acoustic pressures at two fixed locations using wall-mounted microphones or an in-tube traversing microphone, and subsequent calculation of the complex acoustic transfer function, the normal incidence absorption and the impedance ratios of the acoustic material. The test method is intended to provide an alternative, and generally much faster, measurement technique than that of ISO 10534-1.

Compared with the measurement of the sound absorption in a reverberation room according to the method specified in ISO 354, there are some characteristic differences. The reverberation room method will (under ideal conditions) determine the sound absorption coefficient for diffuse sound incidence, and the method can be used for testing of materials with pronounced structures in the lateral and normal directions. However, the reverberation room method requires test specimens which are rather large, so it is not convenient for research and development work, where only small samples of the absorber are available. The impedance tube method is limited to parametric studies at normal incidence but requires samples of the test object which are of the same size as the cross-section of the impedance tube. For materials that are locally reacting, diffuse incidence sound absorption coefficients can be estimated from measurement results obtained by the impedance tube method. For transformation of the test results from the impedance tube method (normal incidence) to diffuse sound incidence, see annex F.

Committee
ISO/TC 43/SC 2
DocumentType
Standard
Pages
27
PublisherName
International Organization for Standardization
Status
Superseded
SupersededBy

DIN ISO 13472-2:2010-12 Acoustics - Measurement of sound absorption properties of road surfaces in situ - Part 2: Spot method for reflective surfaces (ISO 13472-2:2010)
EN ISO 17624:2004 Acoustics - Guidelines for noise control in offices and workrooms by means of acoustical screens (ISO 17624:2004)
BS ISO 13472-2:2010 Acoustics. Measurement of sound absorption properties of road surfaces in situ Spot method for reflective surfaces
DIN ISO 13472-1:2004-04 Acoustics - Measurement of sound absorption properties of road surfaces in situ - Part 1: Extended surface method (ISO 13472-1:2002)
01/563076 DC : DRAFT AUG 2001 BS EN ISO 17624 - ACOUSTICS - GUIDELINES FOR NOISE CONTROL IN OFFICES AND WORKROOMS BY MEANS OF ACOUSTICAL SCREENS
ANSI/ASA S12.54/ISO 3744 : 2011(R2016) 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
ISO 13472-2:2010 Acoustics Measurement of sound absorption properties of road surfaces in situ Part 2: Spot method for reflective surfaces
DIN EN ISO 17624:2005-03 Acoustics - Guidelines for noise control in offices and workrooms by means of acoustical screens (ISO 17624:2004)
BS EN ISO 3744:2010 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
I.S. EN ISO 3744:2010 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
VDI 3755:2015-01 Sound insulation and sound absorption of suspended ceilings
ASTM E 1050 : 2012 : REDLINE Standard Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones and a Digital Frequency Analysis System
ASTM E 2611 : 2017 : REDLINE Standard Test Method for Normal Incidence Determination of Porous Material Acoustical Properties Based on the Transfer Matrix Method
UNI EN ISO 3744 : 2010 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
07/30164074 DC : 0 BS ISO 13472-2 - ACOUSTICS - MEASUREMENT OF SOUND ABSORPTION PROPERTIES OF ROAD SURFACES IN SITU - PART 2: SPOT METHOD FOR REFLECTIVE SURFACES
DIN EN ISO 3744:2011-02 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 (ISO 3744:2010)
BS ISO 13472-1:2002 Acoustics. Measurement of sound absorption properties of road surfaces in situ Extended surface method
ISO 3744:2010 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
BS EN ISO 17624:2004 Acoustics. Guidelines for noise control in offices and workrooms by means of acoustical screens
UNE-EN ISO 3744:2011 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 (ISO 3744:2010)
ISO 17624:2004 Acoustics — Guidelines for noise control in offices and workrooms by means of acoustical screens
EN ISO 3744:2010 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 (ISO 3744:2010)
ISO 13472-1:2002 Acoustics Measurement of sound absorption properties of road surfaces in situ Part 1: Extended surface method
ANSI S12.54:2011 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

ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 354:2003 Acoustics — Measurement of sound absorption in a reverberation room
ISO 266:1997 Acoustics — Preferred frequencies
AS 5335:2019 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
ISO 10534-1:1996 Acoustics Determination of sound absorption coefficient and impedance in impedance tubes Part 1: Method using standing wave ratio

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