1、BRITISH STANDARD BS EN ISO 11654:1997 Acoustics Soundabsorbers for use in buildings Rating of sound absorption The European Standard EN ISO11654:1997 has the status of a British Standard ICS 91.120.20BSENISO11654:1997 This BritishStandard, having been prepared under the directionof the Health and En
2、vironment Sector Board, waspublished under the authorityof the Standards Boardand comes into effect on 15November1997 BSI03-2000 ISBN 0 580 28781 5 National foreword This BritishStandard is the English language version of EN ISO11654:1997. It is identical with ISO11654:1997. The UK participation in
3、its preparation was entrusted by Technical Committee EH/1, Acoustics, to SubcommitteeEH/1/6, Building acoustics, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for ch
4、ange, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC
5、Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The BritishStandards which implement these international European publications may be found in the BSI Standards Catalogue under the section entitled “In
6、ternational Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with
7、 a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN ISO title page, page2, the ISO title page, pagesii toiv, pages1 to6, aninside back cover anda back cover. This standard ha
8、s been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSENISO11654:1997 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword
9、 2 Foreword iii Text of ISO11654 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO11654 April1997 ICS 91.120.20 Descriptors: See ISO document English version Acoustics Sound absorbers for use in buildings Ratingof sound absorption (ISO11654:1997) Acoustique Absorbants pour lutilisati
10、on dans les btiments Evaluation de labsorption acoustique (ISO11654:1997) Akustik Schallabsorber fr die Anwendung in Gebuden Bewertung der Schallabsorption (ISO11654:1997) This European Standard was approved by CEN on1997-03-19. CEN members are bound to comply with the CEN/CENELEC Internal Regulatio
11、ns which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The Europea
12、n Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the nationa
13、l standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland andUnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung
14、 Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref.No.ENISO11654:1997EENISO11654:1997 BSI 03-2000 2 Foreword The text of the International Standard ISO11654:1997 has been prepared
15、 by Technical Committee ISO/TC43 “Acoustics” in collaboration with Technical Committee CEN/TC126 “Acoustic properties of building products and of buildings”, the secretariat of which is held by AFNOR. This European Standard shall be given the status ofa national standard, either by publication of an
16、 identical text or by endorsement, at the latest by October1997, and conflicting national standards shall be withdrawn at the latest by October1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European
17、 Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland andthe UnitedKingdom. Endorsement notice The text of the International Standard ISO11654:1997 was approved by CEN as a European Stand
18、ard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative).ENISO11654:1997 ii BSI 03-2000 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Calculation 2 5 Presentation of results 3 Annex A (informative) Examples
19、 of calculations of wwith and without ashapeindicator 4 Annex B (informative) Classification of sound absorbers 5 Annex C (informative) Example of a standardized diagram for ! svalues 6 Annex ZA (normative) Normative references to international publicationswiththeir relevant European publications In
20、side back cover Figure 1 Reference curve for evaluation of weighted sound absorptioncoefficient, w 2 Figure 2 Specification of depth of construction 3 Figure A.1 Example of a calculation of w( w=0,60) 4 Figure A.2 Example of a calculation of w w=0,60(M) 4 Figure B.1 Illustration of the reference cur
21、ve limiting the different soundabsorption classes 5 Table B.1 Sound absorption classes 5 Descriptors: Acoustics, acoustic absorption, buildings, sound absorbers, tests, estimation, sound absorption coefficient, rules of calculation, acoustic measurements.ENISO11654:1997 BSI 03-2000 iii Foreword ISO
22、(the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical comm
23、ittee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrote
24、chnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an InternationalStandard requires approval by at least75% of the member bodiescasting a vote. International Standard ISO11654 was prepared by Tech
25、nical Committee ISO/TC43, Acoustics, Subcommittee SC2, Building acoustics. Annex A, Annex B and Annex C of this International Standard are for information only.iv blankENISO11654:1997 BSI 03-2000 1 1 Scope 1.1 This International Standard specifies a method by which the frequency-dependent values of
26、the sound absorption coefficient can be converted into asingle number. Before this is done, the one-third-octave band values of the sound absorption coefficient measured in accordance with ISO354 are converted into octave bands. In Annex B a classification method, based on these single numbers, is g
27、iven for information. 1.2 The single-number rating specified in this International Standard can be used to formulate requirements and to describe acoustical properties of sound-absorbing products to be used for routine applications in normal offices, corridors, class rooms, hospitals, etc. The ratin
28、g is not appropriate when the products are to be used in qualified environments requiring careful acoustical design byexpertise. In such cases, only complete sound absorption data as a function of frequency are satisfactory. This International Standard is not applicable unless the applications cover
29、 the whole frequency range of the reference curve. If only a part of this range is of interest, it may be more appropriate to look for products with a good sound absorption within this range only. The shape indicators described in this International Standard give some guidance in identifying such pr
30、oducts which may have a relatively low single number but a much higher potential if a more restricted frequency range is considered. Such products should be judged from the complete sound absorption curve. As the rating curve in this International Standard has as a lower limit the250Hz octave band,
31、the rating is not appropriate below this frequency. If such low frequencies are of interest, reference must be made to the complete sound absorption curve. This International Standard is, in principle, applicable to all building products for which the sound absorption coefficient has been determined
32、 in accordance with ISO354. It is, however, often not suitable for application to single items, such as chairs, baffles, etc., nor is it applicable to road barriers and road surfaces. 2 Normative references The following standards contain provisions which, through reference in this text, constitute
33、provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the st
34、andards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO354:1985, Acoustics Measurement of sound absorption in a reverberation room. ISO354:1985/Amd. 1:, Annex D: Test specimen mountings for sound absorption tests 1) . 3 Definitions For the p
35、urposes of this International Standard, the following definitions apply. 3.1 practical sound absorption coefficient, p frequency-dependent value of the sound absorption coefficient which is based on measurements on one-third-octave bands in accordance with ISO354 and which is calculated in octave ba
36、nds in accordance with this International Standard NOTEFor the value in the i thoctave band, the notation piisused. 3.2 weighted sound absorption coefficient, w single-number frequency-independent value whichequals the value of the reference curve at500Hz after shifting it as specified in this Inter
37、nationalStandard 3.3 shape indicators, L, M, H indication showing practical sound absorption coefficients exceeding those of the shifted reference curve by0,25 or more in different frequency ranges as specified in this International Standard NOTENegative deviations (values under the reference curve)
38、 are not considered as they are already maximized to0,1in the curve-shifting procedure. 1) To be published.ENISO11654:1997 2 BSI 03-2000 4 Calculation 4.1 Practical sound absorption coefficient Calculate the practical sound absorption coefficient, pi , for each octave band i from the arithmetic mean
39、 value of the three one-third-octave sound absorption coefficients, i1 , i2 , and i3within the octave: The mean value is calculated to the second decimal and rounded in steps of0,05 and maximized to pi =1,00 for rounded mean values1,00. NOTEx,y2 is rounded to x,y0 and x,y3 is rounded to x,y5. x,y7 i
40、srounded to x,y5 and x,y8 is rounded to x,y +0,1. EXAMPLE 0,92 is rounded to0,90. 4.2 Weighted sound absorption coefficient Use the pivalues to calculate the weighted sound absorption coefficient wfrom the reference curve shown in Figure 1. Shift the reference curve in steps of0,05 towards the measu
41、red value until the sum of the unfavourable deviations is less than or equal to0,10. An unfavourable deviation occurs at a particular frequency when the measured value is less than the value of the reference curve. Only deviations in the unfavourable direction shall be counted. The weighted sound ab
42、sorption wis defined as the value of the shifted reference curve at500Hz. Examples of calculations of ware given in Annex A. 4.3 Shape indicators Whenever a practical sound absorption coefficient piexceeds the value of the shifted reference curve by0,25 or more, one or more shapeindicators shall be
43、added, in parentheses, to the wvalue. If the excess absorption occurs at250Hz, use the notation L. If the excess absorption occurs at500Hz or1000Hz, use the notation M. If the excess absorption occurs at2000Hz or4000Hz, use the notation H. NOTEA shape indicator means that the sound absorption coeffi
44、cient at one or more frequencies is considerably higher than the values of the shifted reference curve and that the interested parties are encouraged to look at the complete sound absorption coefficient curve. Frequency Value 250Hz 0,80 500Hz 1,00 1000Hz 1,00 2000Hz 1,00 4000Hz 0,90 Figure 1 Referen
45、ce curve for evaluation of weighted sound absorption coefficient, wENISO11654:1997 BSI 03-2000 3 5 Presentation of results Results shall be given in the formats specified in5.1 to5.3. Depending on the purpose of the presentation, one or more of the descriptors can beomitted, unless otherwise specifi
46、ed. 5.1 svalues Plot the values of the one-third-octave band sound absorption coefficients s , measured in accordance with ISO354, on a diagram. Set out the frequency along the x-axis to a logarithmic scale and the values of salong the y-axis to a linear scale. The distance for an octave on the freq
47、uency scale shall be15mm; the distance for a range of0,30in absorption coefficient shall also be15mm. (SeeAnnex C.) Optionally, the diagram may be replaced or supplemented by a table. In that case, the values shall be given to two decimal places. 5.2 pvalues Plot the values of the practical sound ab
48、sorption coefficient pon a diagram. Set out the frequency along the x-axis to a logarithmic scale and the values of palong the y-axis to a linear scale. The distance for an octave on the frequency scale shall be15mm; the distance for a range of0,30 in absorption coefficient shall also be15mm. Scale
49、the y-axis from p=0 to p=1,0 and the x-axis in octave bands from125Hz to4000Hz. (See Annex A.) Optionally, the diagram may be replaced or supplemented by a table. In that case, the values shall be given to two decimal places. 5.3 wvalues and shape indicators Express the weighted sound absorption coefficient wto two decimal places. Express the shape indicators, without commas, in parentheses, after the wvalue. EXAMPLE w=0,70(MH) NOTEWhenever a shape indicator is given, the following
