Acoustics—Laboratory measurement of the reduction of transmitted impact noise by floor coverings on a small floor mock-up—Part 1: Heavyweight compact floor
GB/T 42552.1-2023 Acoustics - Laboratory measurement of the reduction of transmitted impact noise by floor coverings on a small floor mock-up - Part 1: Heavyweight compact floor
1 Scope
This part of ISO 16251 specifies a laboratory measurement method to determine the improvement of impact sound insulation by a floor covering when laid on a standard concrete floor mock-up and excited by a standard tapping machine.
The method is restricted to soft, flexible floor coverings, which transmit impact sound mainly “locally” into the floor, i.e. through the area close to the points of excitation, so that the size of the flooring specimen does not have an influence on the results. Examples of such floor coverings are carpets, PVC, and linoleum.
The results only provide information about the noise radiated. A subjective classification of the quality of the floor coverings is not intended.
The method is kept as close as possible to the ISO 10140 series and yields the same results within the range of uncertainty and within the range of application. In the case of difference with ISO 10140, the result of the ISO 10140 measurement shall be used.
This document provides the measurement method. Product test codes can contain further requirements concerning the specimens, such as temperature range, the number of test specimens or special mounting conditions.
Note: If non-soft, non-flexible floorings are tested, e.g. those with a laminated structure, increased deviations from the results of the ISO 10140 series method may occur due to the dependency on the specimen size.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 717-2 Acoustics - Rating of sound insulation in buildings and of building elements - Part 2: Impact sound insulation
ISO 16063 (all parts) Methods for the calibration of vibration and shock transducers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
vibratory acceleration level
La
3.2
improvement of impact sound insulation
ΔL
reduction of the vibratory acceleration level resulting from installation of the test floor covering for a given one-third octave band
Note: The improvement of impact sound insulation is expressed in decibels.
3.3
locally reacting floor coverings
floor coverings, where the impact is transmitted into the bearing floor predominantly through the area directly excited by the hammers of the tapping machine
Note: Thus the improvement of impact sound insulation does not depend on the size of the specimen.
4 Principle
The method in this document is directly based on the ISO 10140 series, where the test setup consists of two rooms above each other, separated by a standard concrete floor, on which the flooring to be tested is applied. In this part of ISO 16251, the two rooms are removed and the concrete floor is replaced by a small concrete plate of similar thickness (see Annex A). This plate is structurally decoupled from the surroundings by elastic suspensions. As in the ISO 10140 series, a standard tapping machine is used as an impact source and two sound levels “in the lower room” are determined, once with and once without the specimen on the plate. However, instead of the sound pressure level in the lower room, the structure-borne sound level at the lower surface of the concrete plate is determined. It is assumed that for locally reacting floor coverings the structure-borne sound level difference equals the impact sound reduction according to the ISO 10140 series.
In this document, structure-borne sound levels are expressed in terms of acceleration levels. Nevertheless, the same procedures can be applied when measuring velocity or displacement levels instead.
