ISO 10140-2:2021 Acoustics — Laboratory measurement of sound insulation of building elements —Part 2: Measurement of airborne sound insulation

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Acoustics — Laboratory measurement of sound insulation of building elements —Part 2: Measurement of airborne sound insulation是ISO于2021-04发布的ISO标准，适用于全球范围。

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Acoustics — Laboratory measurement of sound insulation of building elements —

Part 2: Measurement of airborne sound insulation

1 Scope

This document specifies a laboratory method for measuring the airborne sound insulation of building products, such as walls, floors, doors, windows, shutters, façade elements, façades, glazing, small technical elements, for instance transfer air devices, airing panels (ventilation panels), outdoor air intakes, electrical raceways, transit sealing systems and combinations, for example walls or floors with linings, suspended ceilings or floating floors.

The test results can be used to compare the sound insulation properties of building elements, classify elements according to their sound insulation capabilities, help design building products which require certain acoustic properties and estimate the in situ performance in complete buildings.

The measurements are performed in laboratory test facilities in which sound transmission via flanking paths is suppressed. The results of measurements made in accordance with this document are not applicable directly to the field situation without accounting for other factors affecting sound insulation, such as flanking transmission, boundary conditions and total loss factor.

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 717-1, Acoustics — Rating of sound insulation in buildings and of building elements — Part 1: Airborne sound insulation

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

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

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

ISO 12999-1, Acoustics — Determination and application of measurement uncertainties in building acoustics — Part 1: Sound insulation

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

sound reduction index

R

ten times the common logarithm of the ratio of the sound power, W , that is incident on the test element 1

to the sound power, W , radiated by the test element to the other side, expressed by

2

W

1

R=10 l g (1)

W

2

Note 1 to entry: R is expressed in decibels.

Note 2 to entry: For laboratory measurements using sound pressure, the sound reduction index is calculated using:

S

RL=−L +10 l g (2)

12

A

where

L is the energy average sound pressure level in the source room, in decibels;

1

L is the energy average sound pressure level in the receiving room, in decibels;

2

S is the area of the free test opening in which the test element is installed, in square metres;

A is the equivalent sound absorption area in the receiving room, in square metres.

Note 3 to entry: The derivation of Formula (2) from Formula (1) assumes that the sound fields are diffuse and that the only sound radiated into the receiving room is from the test element.

Note 4 to entry: The expression “sound transmission loss” (TL) is also in use in English-speaking countries. It is equivalent to “sound reduction index”.

Note 5 to entry: Related quantities can be introduced in other documents or test codes, often by adding subscripts, i.e. R for the sound reduction index as measured by intensity methods, R as the sound reduction index per unit I s

length of slits or ΔR as the improvement in sound reduction index by linings or suspended ceilings.

3.2

apparent sound reduction index

R'

ten times the common logarithm of the ratio of the sound power, W , that is incident on a test element to 1

the total sound power radiated into the receiving room if, in addition to the sound power, W , radiated 2

by the test element, the sound power, W , radiated by flanking elements or by other components is 3

significant, expressed by

 W 

1

R′=10 l g (3)

 

WW+

 

23

Note 1 to entry: R' is expressed in decibels.

Note 2 to entry: In general, the sound power transmitted into the receiving room consists of the sum of several components. Also, in this case, under the assumption that there are diffuse sound fields in the two rooms, the apparent sound reduction index is evaluated from Formula (4).

S

R'=−LL +10 l g (4)

12

A

Thus, in the apparent sound reduction index, the sound power transmitted into the receiving room is related to the sound power that is incident on the test element, as in Formula (2), irrespective of the actual conditions of transmission.

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