ISO 10140-4:2021 Acoustics — Laboratory measurement of sound insulation of building elements —Part 4: Measurement procedures and requirements

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Acoustics — Laboratory measurement of sound insulation of building elements —Part 4: Measurement procedures and requirements由ISO于2021-04发布，适用于全球范围。

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Acoustics — Laboratory measurement of sound insulation of building elements —

Part 4: Measurement procedures and requirements

1 Scope

This document specifies the basic measurement procedures for airborne and impact sound insulation of building elements in laboratory test facilities.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 3382-2, Acoustics — Measurement of room acoustic parameters — Part 2: Reverberation time in ordinary rooms

ISO 10140-1:2021, Acoustics — Laboratory measurement of sound insulation of building elements — Part 1: Application rules for specific products

ISO 10140-2, Acoustics — Laboratory measurement of sound insulation of building elements — Part 2: Measurement of airborne sound insulation

ISO 10140-3, Acoustics — Laboratory measurement of sound insulation of building elements — Part 3: Measurement of impact sound insulation

ISO 10140-5:2021, Acoustics — Laboratory measurement of sound insulation of building elements — Part 5: Requirements for test facilities and equipment

ISO 10848-1:2017, Acoustics — Laboratory and field measurement of flanking transmission for airborne, 

impact and building service equipment sound between adjoining rooms — Part 1: Frame document

ISO 18233, Acoustics — Application of new measurement methods in building and room acoustics

3 Terms a nd definiti ons

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso. org/ obp

— IEC Electropedia: available at http:// www .electropedia .org/

3.1

energy average sound pressure level in a room

L

ten times the common logarithm of the ratio of the space and time average of the squared sound pressure to the square of the reference sound pressure, the space average being taken over the entire room with the exception of those parts where the direct radiation of a sound source or the near field of the boundaries (walls, etc.) is of significant influence

Note 1 to entry: L is expressed in decibels.

3.2

reverberation time

T

time required for the sound pressure level in a room to decrease by 60 dB after the sound source has stopped

Note 1 to entry: The reverberation time is expressed in seconds.

Note 2 to entry: The reverberation time is usually calculated using linear extrapolation of much shorter evaluation ranges than 60 dB.

3.3

structural reverberation time

T

s

time required for the acceleration level in a structure to decrease by 60 dB after the structure-borne sound source has stopped

Note 1 to entry: The structural reverberation time is expressed in seconds.

Note 2 to entry: T is usually calculated using linear extrapolation of much shorter evaluation ranges than 60 dB, s

normally 15 dB or 20 dB.

3.4

background noise level

measured sound pressure level in the receiving room from all sources other than the loudspeaker or tapping machine in the source room

3.5

continuously moving microphone

microphone that, with respect to a fixed point,

a) moves with approximately constant speed in a circle, or

b) sweeps, over a fixed time period, to and fro along the arc of a circle, which is as large as possible, but is not to be less than 270°

4 Measurement procedures and requirements

4.1 Frequency range

All quantities shall be measured using one-third octave band filters having at least the following centre frequencies, in hertz:

100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1 000, 1 250, 1 600, 2 000, 2 500, 3 150, 4 000, 5 000.

If additional information in the low-frequency range is required, use one-third octave band filters with the following centre frequencies, in hertz:

50, 63, 80.

For additional measurements at low frequencies, guidance is given in Annex A.

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