1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 10848-4:2010Acoustics Laboratorymeasurement of the flankingtransmission of airborneand impact sound betweenadjoining roomsPart 4: Application to junctions with at least
2、one heavy element (ISO 10848-4:2010)BS EN ISO 10848-4:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO10848-4:2010.The UK participation in its preparation was entrusted to TechnicalCommittee EH/1/6, Building acoustics.A list of organizations represented
3、on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 65930 0ICS 91.120.20Compliance with a British Standard cannot confer immunity
4、fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2011.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 10848-4 August 2010 ICS 91.120.20 English Versi
5、on Acoustics - Laboratory measurement of the flanking transmission of airborne and impact sound between adjoining rooms - Part 4: Application to junctions with at least one heavy element (ISO 10848-4:2010) Acoustique - Mesurage en laboratoire des transmissions latrales du bruit arien et des bruits d
6、e choc entre pices adjacentes - Partie 4: Application aux jonctions ayant au moins un lment lourd (ISO 10848-4:2010) Akustik - Messung der Flankenbertragung von Luftschall und Trittschall zwischen benachbarten Rumen in Prfstnden - Teil 4: Anwendung auf Stostellen mit mindestens einem schweren Bautei
7、l (ISO 10848-4:2010) This European Standard was approved by CEN on 14 July 2010. 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. Up-to-date lists and b
8、ibliographical references concerning such national standards may be obtained on application to the CEN 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 under the responsibil
9、ity of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
10、 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: A
11、venue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 10848-4:2010: EBS EN ISO 10848-4:2010EN ISO 10848-4:2010 (E) 3 Foreword This document (EN ISO 10848-4:2010) has been prepared by Technical Co
12、mmittee CEN/TC 126 “Acoustic properties of building elements and of buildings“, the secretariat of which is held by AFNOR, in collaboration with Technical Committee ISO/TC 43 “Acoustics“. This European Standard shall be given the status of a national standard, either by publication of an identical t
13、ext or by endorsement, at the latest by February 2011, and conflicting national standards shall be withdrawn at the latest by February 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held resp
14、onsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finl
15、and, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN ISO 10848-4:2010ISO 10848-4:2010(E) ISO 2010 All rights reserved iiiForew
16、ord ISO (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 techni
17、cal committee 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 e
18、lectrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to
19、the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for i
20、dentifying any or all such patent rights. ISO 10848-4 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 126, Acoustics properties of building elements and of buildings, in collaboration with Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Buildi
21、ng acoustics, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). ISO 10848 consists of the following parts, under the general title Acoustics Laboratory measurement of the flanking transmission of airborne and impact sound between adjoining rooms: Part
22、1: Frame document Part 2: Application to light elements when the junction has a small influence Part 3: Application to light elements when the junction has a substantial influence Part 4: Application to junctions with at least one heavy element BS EN ISO 10848-4:2010ISO 10848-4:2010(E) iv ISO 2010 A
23、ll rights reservedIntroduction ISO 10848 specifies measurement methods to be performed in a laboratory test facility in order to characterize the flanking transmission of one or several building components. The measured quantities, normalized flanking level difference, normalized flanking impact sou
24、nd pressure level or vibration reduction index, can be used to compare different products, or to express a requirement, or as input data for prediction methods, such as ISO 15712-11and ISO 15712-22. BS EN ISO 10848-4:2010INTERNATIONAL STANDARD ISO 10848-4:2010(E) ISO 2010 All rights reserved 1Acoust
25、ics Laboratory measurement of the flanking transmission of airborne and impact sound between adjoining rooms Part 4: Application to junctions with at least one heavy element 1 Scope This part of ISO 10848 specifies laboratory measurements of normalized flanking level difference, normalized flanking
26、impact sound pressure level or vibration reduction index of buildings where at least one of the elements that form the construction under test is not a light element. This part of ISO 10848 applies to T- or X-junctions. 2 Normative references The following referenced documents are indispensable for
27、the application 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 140-2, Acoustics Measurement of sound insulation in buildings and of building elements Part 2: Determi
28、nation, verification and application of precision data ISO 140-3:1995, Acoustics Measurement of sound insulation in buildings and of building elements Part 3: Laboratory measurements of airborne sound insulation of building elements ISO 140-6:1998, Acoustics Measurement of sound insulation in buildi
29、ngs and of building elements Part 6: Laboratory measurements of impact sound insulation of floors ISO 717-1, Acoustics Rating of sound insulation in buildings and of building elements Part 1: Airborne sound insulation ISO 717-2, Acoustics Rating of sound insulation in buildings and of building eleme
30、nts Part 2: Impact sound insulation ISO 10848-1:2006, Acoustics Laboratory measurement of the flanking transmission of airborne and impact sound between adjoining rooms Part 1: Frame document BS EN ISO 10848-4:2010ISO 10848-4:2010(E) 2 ISO 2010 All rights reserved3 Terms and definitions For the purp
31、oses of this document, the following terms and definitions apply. 3.1 normalized flanking level difference Dn,fdifference in the space and time average sound pressure level produced in two rooms by one or more sound sources in one of them, when the transmission only occurs through a specified flanki
32、ng path NOTE Dn,fis normalized to an equivalent sound absorption area (A0) in the receiving room and is expressed in decibels: n,f 1 2010 lg dBADLLA= (1) where L1is the average sound pressure level in the source room, in decibels; L2is the average sound pressure level in the receiving room, in decib
33、els; A is the equivalent sound absorption area in the receiving room, in square metres; A0is the reference equivalent sound absorption area, in square metres; A0= 10 m2. ISO 10848-1:2006 3.2 normalized flanking impact sound pressure level Ln,fspace and time average sound pressure level in the receiv
34、ing room produced by a standard tapping machine operating at different positions on a tested floor in the source room, when the transmission only occurs through a specified flanking path NOTE Ln,fis normalized to an equivalent sound absorption area (A0) in the receiving room and is expressed in deci
35、bels: n,f 2010 lg dBALLA=+ (2) where L2is the average sound pressure level in the receiving room, in decibels; A is the equivalent sound absorption area in the receiving room, in square metres; A0is the reference equivalent sound absorption area, in square metres; A0= 10 m2. ISO 10848-1:2006 3.3 vib
36、ration reduction index Kijvalue given by the following equation and expressed in decibels: ,10 lg dBijij v ijijlKDaa=+ (3) BS EN ISO 10848-4:2010ISO 10848-4:2010(E) ISO 2010 All rights reserved 3where ,vijD is the direction-averaged velocity level difference between elements i and j, in decibels; li
37、jis the junction length between elements i and j in metres; ai, ajare the equivalent absorption lengths of elements i and j, in metres. ISO 10848-1:2006 NOTE 1 The equivalent absorption length depends on the structural reverberation time as defined in ISO 10848-1:2006, 3.8. For light, well-damped ty
38、pes of elements where the actual situation has no real influence on the sound reduction index and damping of an element, ajis taken as numerically equal to the surface area Sjof the element, aj= Sj/l0, where the reference length l0= 1 m. NOTE 2 The vibration reduction index is related to the vibrati
39、onal power transmission over a junction between structural elements, normalized in order to make it an invariant quantity. 4 Principle The relevant quantity to be measured is selected in accordance with ISO 10848-1:2006, 4.4. The performance of the building components is expressed either as an overa
40、ll quantity for the combination of elements and junction like Dn,fand Ln,for as the vibration reduction index, Kij, of a junction. Dn,fand Ln,fdepend on the actual dimensions of the elements, while Kijis in principle an invariant quantity. For general application of the test results, Dn,fand Ln,fare
41、 the relevant quantities to measure for characterizing the transmission between two light, well-damped types of elements, e.g. timber- or metal-framed stud walls or wooden floors on beams. To characterize the transmission between two heavy elements with reverberant vibration fields, Kijis the releva
42、nt quantity to measure. It is not possible to give general guidelines about which quantity to select for transmission between light and heavy elements. 5 Measuring equipment The equipment shall fulfill the requirements of ISO 10848-1:2006, Clause 5. 6 Test arrangement 6.1 Requirements for the labora
43、tory The general requirements for test specimens and test rooms given in ISO 10848-1:2006, Clause 6 shall be fulfilled. For measurements of the vibration reduction index, Kij, with structure-borne excitation, it is not necessary to have an envelope forming a source and receiving room around the junc
44、tion. 6.2 Installation of the test junction 6.2.1 Light elements For light elements, it is not compulsory to use realistic construction techniques at the boundaries of the test element with the test facility. When the test facility is made of heavy concrete, a light test element may be mounted accor
45、ding to common practice, or according to the manufacturers instructions. If the test junction is just placed on the floor, without any supporting structure, the edges of all light elements may generally be left free. BS EN ISO 10848-4:2010ISO 10848-4:2010(E) 4 ISO 2010 All rights reserved6.2.2 Heavy
46、 elements For heavy elements, the mode count in a one-third-octave-band and the modal overlap factor are important parameters for the obtainable measurement accuracy at low frequencies. The mode count in a one-third-octave-band, N, is determined by modal analysis or estimated from: N = B n (4) where
47、 B is the bandwidth of a one-third-octave-band, approximated by 0,23 f in which f is the centre frequency of the band; n is the modal density, estimated from: c20S fnc= (5) in which S is the surface area, in square metres, of the element j; fcis the critical frequency, in hertz; c0is the speed, in m
48、etres per second, of sound in air. Determination of the critical frequency is specified in ISO 10848-1:2006, 8.1.1. The modal overlap factor, M, is calculated from: s2,2 nMT= (6) where n is the the modal density; Tsis the measured structural reverberation time. For every heavy element that is a part
49、 of the junction under test, check whether the modal overlap factor is at least unity at 250 Hz and higher frequencies. NOTE Kijis generally overestimated when measured for a transmission path that includes an element with a modal overlap factor less than unity. IMPORTANT For measurement accuracy, the modal overlap factor needs to be as high as possible and preferably at least unity. The mode count in a one-third-octave-band should also be as high as possible. Five or more modes per one-third-o
