BS EN ISO 10848-4-2010

BSI Standards Publication BS EN ISO 10848-4:2010 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)BS EN ISO 10848-4:2010 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN ISO 10848-4:2010. The UK participation in its preparation was entrusted to Technical Committee EH/1/6, Building acoustics. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © BSI 2011 ISBN 978 0 580 65930 0 ICS 91.120.20 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2011. Amendments issued since publication Date Text affected EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 10848-4 August 2010 ICS 91.120.20 English Version 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 latérales du bruit aérien et des bruits de choc entre pièces adjacentes - Partie 4: Application aux jonctions ayant au moins un élément lourd (ISO 10848-4:2010) Akustik - Messung der Flankenübertragung von Luftschall und Trittschall zwischen benachbarten Räumen in Prüfständen - Teil 4: Anwendung auf Stoßstellen mit mindestens einem schweren Bauteil (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 bibliographical 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 responsibility 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, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue 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 10848-4:2010 EN ISO 10848-4:2010 (E) 3 Foreword This document (EN ISO 10848-4:2010) has been prepared by Technical Committee 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 text 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 responsible 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, Finland, 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 10848-4:2010 ISO 10848-4:2010(E) © ISO 2010 – All rights reserved iiiForeword 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 technical 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 electrotechnical 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 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 identifying 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, Building 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 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 10848-4:2010 ISO 10848-4:2010(E) iv © ISO 2010 – All 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 sound 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 15712-1 [1]and ISO 15712-2 [2] . BS EN ISO 10848-4:2010 INTERNATIONAL STANDARD ISO 10848-4:2010(E)© ISO 2010 – All rights reserved 1Acoustics — 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 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 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: Determination, 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 buildings 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 elements — 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 10848-4:2010 ISO 10848-4:2010(E) 2 © ISO 2010 – All rights reserved3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 normalized flanking level difference D n,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 flanking path NOTE D n,fis normalized to an equivalent sound absorption area (A 0 ) in the receiving room and is expressed in decibels: n,f 1 2 0 10 lg dB A DLL A =−− (1) where L 1is the average sound pressure level in the source room, in decibels; L 2is 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; A 0is the reference equivalent sound absorption area, in square metres; A 0= 10 m 2 . [ISO 10848-1:2006] 3.2 normalized flanking impact sound pressure level L n,fspace and time average sound pressure level in the receiving 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 L n,fis normalized to an equivalent sound absorption area (A 0 ) in the receiving room and is expressed in decibels: n,f 2 0 10 lg dB A LL A =+ (2) where L 2is 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; A 0is the reference equivalent sound absorption area, in square metres; A 0= 10 m 2 . [ISO 10848-1:2006] 3.3 vibration reduction index K ijvalue given by the following equation and expressed in decibels: , 10 lg dB ij ij v ij ij l KD aa =+ (3) BS EN ISO 10848-4:2010 ISO 10848-4:2010(E) © ISO 2010 – All rights reserved 3where , vij D is the direction-averaged velocity level difference between elements i and j, in decibels; l ijis the junction length between elements i and j in metres; a i , a jare 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 types of elements where the actual situation has no real influence on the sound reduction index and damping of an element, a jis taken as numerically equal to the surface area S jof the element, a j= S j /l 0 , where the reference length l 0= 1 m. NOTE 2 The vibration reduction index is related to the vibrational 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 overall quantity for the combination of elements and junction like D n,fand L n,for as the vibration reduction index, K ij , of a junction. D n,fand L n,fdepend on the actual dimensions of the elements, while K ijis in principle an invariant quantity. For general application of the test results, D n,fand L n,fare 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, K ijis the relevant 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 laboratory 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, K ij , with structure-borne excitation, it is not necessary to have an envelope forming a source and receiving room around the junction. 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 according to common practice, or according to the manufacturer s 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 10848-4:2010 ISO 10848-4:2010(E) 4 © ISO 2010 – All rights reserved6.2.2 Heavy 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 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: c 2 0S f n c π = (5) in which S is the surface area, in square metres, of the element j; f cis the critical frequency, in hertz; c 0is the speed, in metres 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: s 2,2 n M T = (6) where n is the the modal density; T sis the measured structural reverberation time. For every heavy element that is a part of the junction under test, check whether the modal overlap factor is at least unity at 250 Hz and higher frequencies. NOTE K ijis 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