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1、BRITISH STANDARD BS EN 12354-6:2003 Building Acoustics Estimation of acoustic performance of buildings from the performance of elements Part 6: Sound absorption in enclosed spaces The European Standard EN 12354-6:2003 has the status of a British Standard ICS 91.120.20 ? Licensed Copy: sheffieldun sh
2、effieldun, na, Sat Oct 28 09:46:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12354-6:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 15 January 2004 BSI 15 January 2004 ISBN 0 580 43268 8 National foreword This British Standard is
3、 the official English language version of EN 12354-6:2003. The UK participation in its preparation was entrusted by Technical Committee B/209, General building codes, to Subcommittee B/209/18, Sound insulation, which has the responsibility to: A list of organizations represented on this subcommittee
4、 can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Searc
5、h” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obl
6、igations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary
7、 of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 25 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffie
8、ldun sheffieldun, na, Sat Oct 28 09:46:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12354-6 December 2003 ICS 91.120.20 English version Building Acoustics - Estimation of acoustic performance of buildings from the performance of elements - Part 6
9、: Sound absorption in enclosed spaces Acoustique du btiment - Calcul de la performance acoustique des btiments partir de la performance des lments - Partie 6: Absorption acoustique des pices et espaces ferms Bauakustik - Berechnung der akustischen Eigenschaften von Gebuden aus den Bauteileigenschaft
10、en - Teil 6: Schallabsorption in Rumen This European Standard was approved by CEN on 13 November 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
11、Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation und
12、er the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Ita
13、ly, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitatio
14、n in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12354-6:2003 E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:46:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12354-6:2003 (E) 2 ContentsPage Foreword3 1Scope 4 2Normative references 4 3Relevant qu
15、antities4 3.1Building performance4 3.2Element performance 5 3.3Other terms and quantities.5 4Calculation models6 4.1General principles6 4.2Input data6 4.3Determination of the total equivalent absorption area 7 4.4Determination of reverberation time8 4.5Interpretations9 4.6Limitations9 5Accuracy.10 A
16、nnex A (normative) List of symbols11 Annex B (informative) Sound absorption of materials14 B.1Examples 14 B.2Calculation14 Annex C (informative) Sound absorption of objects .17 Annex D (informative) Estimation for irregular spaces and/or absorption distribution 18 D.1Introduction18 D.2Irregular abso
17、rption distribution18 D.3Irregularly shaped spaces.22 Annex E (informative) Calculation example24 Bibliography25 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:46:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12354-6:2003 (E) 3 Foreword This document (EN 12354-6:2003) has been prepared
18、 by Technical Committee CEN/TC 126 “Acoustic properties of building products and of buildings”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2004
19、, and conflicting national standards shall be withdrawn at the latest by June 2004. This document is the first version of a standard which forms a part of a series of standards specifying calculation models in building acoustics: Part 1: Airborne sound insulation between rooms Part 2: Impact sound i
20、nsulation between rooms Part 3: Airborne sound insulation against outdoor sound Part 4: Transmission of indoor sound to the outside Part 5: Sound levels due to service equipment Part 6: Sound absorption in enclosed spaces Although this part covers the most common types of enclosed spaces in building
21、s it cannot yet cover all variations of such spaces. It sets out an approach for gaining experience for future improvements and developments of the standard. The accuracy of this standard cannot be specified in detail until wide ranging comparisons with field data have been made, which can, in turn,
22、 only be gathered over a period of use of the prediction model. To help the user in the meantime, indications of the accuracy have been given, based on earlier comparable prediction models. It is the responsibility of the user (i.e. a person, an organisation, the authorities) to consider the consequ
23、ences of the accuracy, inherent in all measurement and prediction methods, to specify requirements for input data and/or apply a safety margin to the results or to apply some other correction. Annex A is normative, annexes B, C, D and E are informative. According to the CEN/CENELEC Internal Regulati
24、ons, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden
25、, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:46:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12354-6:2003 (E) 4 1 Scope This European Standard describes a calculation model to estimate the total equivalent sound absorption area or reverberation
26、time of enclosed spaces in buildings. The calculation is primarily based on measured data that characterise the sound absorption of materials and objects. Calculations can only be carried out for frequency bands. This European Standard describes the principles of the calculation model, lists the rel
27、evant quantities and defines its applications and restrictions. It is intended for acoustical experts and provides the framework for the development of application documents and tools for other users in the field of building construction, taking into account local circumstances. The model is based o
28、n experience with predictions for rooms, such as rooms in dwellings and offices, and common spaces in buildings, such as stairwells, corridors and rooms containing machinery and technical equipment. It is not intended to be used for very large or irregularly-shaped spaces, such as concert halls, the
29、atres and factories. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent am
30、endments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN ISO 354, Acoustics - Measurement of sound absorptio
31、n in a reverberation room (ISO 354:2003). ISO 9613-1, Acoustics - Attenuation of sound during propagation outdoors - Part 1: Calculation of the absorption of sound by the atmosphere. 3 Relevant quantities 3.1 Building performance 3.1.1 quantities to express building performance sound absorption in e
32、nclosed spaces can be expressed in terms of the equivalent absorption area or the reverberation time in accordance with prEN ISO 3382-2. These quantities are determined in frequency bands (one-third octave bands or octave bands) 3.1.2 equivalent sound absorption area of a room A hypothetical area of
33、 a totally absorbing surface without diffraction effects which, if it were the only absorbing element in the room, would give the same reverberation time as the room under consideration NOTEEquivalent sound absorption area of a room is expressed in m2. 3.1.3 reverberation time T time required for th
34、e sound pressure level to decrease by 60 dB after the sound source has stopped NOTE 1Reverberation time is expressed in s. NOTE 2The definition of T with a decrease by 60 dB of the sound pressure level may be fulfilled by linear extrapolation of a shorter evaluation range. Licensed Copy: sheffieldun
35、 sheffieldun, na, Sat Oct 28 09:46:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12354-6:2003 (E) 5 NOTE 3Where a decay curve is not monotonic the reverberation time is defined by the times at which the decay curve first reaches 5 dB and 25 dB below the initial level, respectively. In the case of
36、 uncertainty this reverberation time should be labelled T20. 3.2 Element performance 3.2.1 quantities to express element performance sound absorption of elements in accordance with EN ISO 354 can be expressed as the equivalent sound absorption area or the sound absorption coefficient. These quantiti
37、es are determined in one-third octave bands and can also be expressed in octave bands NOTEAlso a single number rating for the element performance can be obtained from the frequency band data in accordance with EN ISO 11654 7, for instance w(M). Such single number ratings may be used for comparing or
38、 specifying the required performance of products, but they cannot be used directly to calculate the performance in situ. 3.2.2 equivalent sound absorption area of an object Aobj difference between the equivalent sound absorption area with and without the object (test specimen) in the test room NOTEE
39、quivalent sound absorption area of an object is expressed in m2. 3.2.3 sound absorption coefficient s equivalent sound absorption area of a test specimen divided by the area of the test specimen NOTE 1For plane absorbers with both sides exposed, this relates to each side as an average value over bot
40、h sides. NOTE 2This quantity applies only to a flat absorber or a specified array of objects, and not to single objects. 3.2.4 other relevant data for calculations additional information may be necessary, e.g.: area of the room boundary elements; volume and shape of the enclosed space; amount and na
41、ture of objects and fittings in the enclosed space; number of people assumed to be present in the room 3.3 Other terms and quantities 3.3.1 absorption by air Aair equivalent absorption area of the sound attenuation by air 3.3.2 empty room volume V volume of the enclosed space without the objects and
42、 fittings present Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:46:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12354-6:2003 (E) 6 3.3.3 object volume Vobj volume of the smallest regular shaped envelope for an object, ignoring small elements that protrude through that envelope NOTEAn
43、 example of small protruding elements which can be ignored, are the legs of a table. 3.3.4 object fraction ratio of the sum of the volumes of all objects to the volume of the empty space 3.3.5 object array specific array of objects for which the absorption is expressed by a sound absorption coeffici
44、ent s related to the surface area covered by the array. 4 Calculation models 4.1 General principles For the calculation of the equivalent sound absorption area and reverberation time in enclosed spaces it is assumed that the sound field is diffused. This means that the dimensions of the enclosed spa
45、ce are similar (see 4.6) and the absorption is distributed over the space; the presence of sound scattering objects relaxes these restrictions. The effect of absorption by surfaces, by objects - including persons -, by object arrays and by air is taken into account. NOTE 1For other situations, such
46、as irregularly shaped spaces and irregular absorption distribution, guidance for improved calculation models is given in annex D. In irregularly shaped spaces, such as stairwells or rooms filled with machinery, it is assumed that the sound pressure level and hence absorption better characterises the
47、 performance than reverberation time. The model can be used to calculate the building performance in frequency bands, based on acoustic data for the elements in frequency bands. The calculation is normally performed in octave bands in the frequency range from 125 Hz to 4 000 Hz. NOTE 2The calculatio
48、ns can be extended to higher or lower frequencies. However, particularly for the lower frequencies no information is available at present on the accuracy of calculations for these extended frequency regions. A list of symbols used in the models is given in annex A. 4.2 Input data The equivalent abso
49、rption area and the reverberation time can be determined from: absorption coefficient of surface i: s,i; area of surface i: Si; equivalent absorption area of object j: Aobj,j; absorption coefficient of object array k: s,k; area of surface covered by the object array k: Sk; volume of empty enclosed space: V; Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:46:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12354-6:2003 (E) 7 volu