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Norm
ÖNORM EN ISO 10534-1
Issue date: 2002 01 01
Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes - Part 1: Method using standing wave ratio (ISO 10534-1:1996)
1.1 This part of IS0 10534 specifies a method for
the determination of the sound absorption coefficient,
reflection factor and surface impedance or surface
admittance ...
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Valid
Publisher:
Austrian Standards International
Format:
Digital | 29 Pages
Language:
German
| English
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Optionally co-design standards:
ICS
1.1 This part of IS0 10534 specifies a method for
the determination of the sound absorption coefficient,
reflection factor and surface impedance or surface
admittance of materials and objects. The values are
determined for normal sound incidence by evaluation
of the standing wave pattern of a plane wave in a
tube, which is generated by the superposition of an
incident sinusoidal plane wave with the plane wave
reflected from the test object.
This method can be used for the determination of the
sound absorption coefficient of sound absorbers for
normal sound incidence. It can further be used for the
determination of the acoustical surface impedance or
surface admittance of sound-absorbing materials. It is
well suited for parameter studies and for the design of
sound absorbers, because only small samples of the
absorber material are needed.
1.2 There are some characteristic differences between
this method and the measurement of sound
absorption in a reverberation room (see IS0 354).
The impedance tube method can be used for the determination
of the reflection factor and also the impedance
or admittance. The sound is incident normally
on the object surface. The reverberation room method
will (under idealized conditions) determine the sound
absorption coefficient for random sound incidence.
The impedance tube method relies on the existence
of a plane incident sound wave and gives exact values
under this condition (measuring and mounting errors
excluded). The evaluation of the sound absorption coefficient
in a reverberation room is based on a number
of simplifying and approximate assumptions concerning
the sound field and the size of the absorber.
Sound absorption coefficients exceeding the value 1
are therefore sometimes obtained.
The impedance tube method requires samples of the
test object which are the size of the cross-sectional
area of the impedance tube. The reverberation room
m (...abbreviated)
ÖNORM EN ISO 10534-1
2002 01 01
Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes - Part 1:...
Norm
↖
Norm
ISO 10534-1:1996
Issue date :
1996 12 12
Acoustics — Determination of sound absorption coefficient and impedance in impedance tubes — Part 1: Method using standing wave ratio
Norm
ÖNORM EN ISO 354
Issue date :
2003 11 01
Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003)
Norm
ISO 354:1985
Issue date :
1985 01 24
Acoustics — Measurement of sound absorption in a reverberation room