ISO 10848-4:2017 音響学—隣接する部屋間の空中、衝撃、および建物のサービス機器の音の側面伝達の実験室および現場での測定—パート4：少なくとも1つのタイプA要素を備えた接合部への適用 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building acoustics.

This second edition cancels and replaces the first edition (ISO 10848-4:2010), which has been technically revised. The main change is the extension to field measurements.

A list of all the parts in the ISO 10848 series can be found on the ISO website.

1 Scope

ISO 10848 (all parts) specifies measurement methods to characterize the flanking transmission of one or several building components.

This document specifies laboratory and field measurements of buildings where at least one of the elements that form the construction under test is a Type A element (defined in ISO 10848-1).

Laboratory measurements are used to quantify the performance of the junction with suppressed flanking transmission from the laboratory structure. Field measurements are used to characterize the in situ performance and it is not usually possible to suppress unwanted flanking transmission sufficiently; hence, the results are primarily representative of the performance of that junction when installed in that particular building structure.

The measured quantities can be used to compare different products, or to express a requirement, or as input data for prediction methods, such as ISO 12354-1 and ISO 12354-2.

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.

3 Terms and definitions

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:

3.1

vibration reduction index

K_ij

direction-averaged velocity level difference between two elements across a junction that is normalised to the junction length and the equivalent sound absorption length of both elements as follows

where

		is the direction-averaged velocity level difference between elements i and j, in dB;
	lij	is the junction length between elements i and j, in m;
	ai , aj	are the equivalent absorption lengths of elements i and j, in m.

Note 1 to entry: This quantity is expressed in decibels.

Note 2 to entry:K_ij can be obtained from measurements of the velocity level difference in both directions across the junction and the structural reverberation time of the two elements i and j.

Bibliography