1、BRITISH STANDARDBS EN ISO 18233:2006Acoustics Application of new measurement methods in building and room acousticsThe European Standard EN ISO 18233:2006 has the status of a British StandardICS 91.120.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g
2、3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 18233:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2006ISBN 0 580 49362 8National forewordThis Britis
3、h Standard was published by BSI. It is the UK implementation of EN ISO 18233:2006. The UK participation in its preparation was entrusted by Technical Committee EH/1, Acoustics, to Subcommittee EH/1/6, Building acoustics.A list of organizations represented on EH/1/6 can be obtained on request to its
4、secretary.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 cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STAN
5、DARDNORME EUROPENNEEUROPISCHE NORMEN ISO 18233June 2006ICS 91.120.20English VersionAcoustics - Application of new measurement methods in buildingand room acoustics (ISO 18233:2006)Acoustique - Application de nouvelles mthodes de mesuredans lacoustique des btiments et des salles (ISO18233:2006)Akusti
6、k - Anwendung neuer Messverfahren in der Bau- undRaumakustik (ISO 18233:2006)This European Standard was approved by CEN on 19 May 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national st
7、andard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other l
8、anguage made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,G
9、ermany, 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGM
10、anagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 18233:2006: EForeword This document (EN ISO 18233:2006) has been prepared by Technical Committee ISO/TC 43 “Acoustics“ in
11、collaboration with Technical Committee CEN/TC 126 “Acoustic properties of building elements 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 late
12、st by December 2006, and conflicting national standards shall be withdrawn at the latest by December 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech
13、 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. Endorsement notice The text of ISO 18233:2006 has
14、been approved by CEN as EN ISO 18233:2006 without any modifications. EN ISO 18233:2006Reference numberISO 18233:2006(E)INTERNATIONAL STANDARD ISO18233First edition2006-06-01Acoustics Application of new measurement methods in building and room acoustics Acoustique Application de nouvelles mthodes de
15、mesurage dans lacoustique des btiments et des salles EN ISO 18233:2006ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms definitions and abbreviated terms 1 3.1 Terms and definitions. 1 3.2 Abbreviated terms 2 4 Designations . 2 4.1 Maximum length sequence
16、method (MLS). 2 4.2 Swept-sine method (SS). 2 5 Theory 2 5.1 General. 2 5.2 Sound in a room 3 5.3 Sound transmission between two rooms. 5 5.4 Using the frequency response function. 6 6 Measurement of the impulse response 7 6.1 General. 7 6.2 Excitation signal . 7 6.3 Measurement of the response. 9 7
17、 Measurement of the frequency response function . 14 8 Precision 14 9 Test report . 15 Annex A (normative) Maximum length sequence method. 16 Annex B (normative) Swept-sine method 20 Bibliography . 26 EN ISO 18233:2006Foreword ISO (the International Organization for Standardization) is a worldwide f
18、ederation 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 co
19、mmittee. 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 accor
20、dance 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 requir
21、es 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 18233 was prepared by Technical
22、 Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building acoustics. EN ISO 18233:2006iv vIntroduction Stochastic signal analysis methods for the measurement of sound transmission phenomena started to be developed around 1960, but lack of available computing power excluded the use of these method
23、s outside the best equipped research laboratories. The development of digitizing circuitry, powerful personal computers and the use of digital signal processing components in sound measuring equipment for field use, have made the application of measuring equipment based on extended digital signal an
24、alysis readily available. Dedicated instruments, as well as specialized software used on general computers, currently apply such methods and are already widely used. The new methods bring a number of advantages compared to the well-established classical methods, such as suppression of background noi
25、se and extended measurement range. However, there is also risk of unreliable results if certain guidelines are not followed. The new methods may demonstrate larger sensitivity to time-variations and change in the environmental conditions than the classical methods. This International Standard is dev
26、eloped to give requirements and guidelines for the use of new measurement methods in building and room acoustic measurements, but can also be used in the construction of measuring equipment for the implementation of the methods. As even an experienced user of equipment based on classical methods may
27、 be unaware of the difficulties and limitations for some applications of the new methods, the user is encouraged to develop a deeper understanding of the theoretical bases for the new methods. Instrument manufacturers are also encouraged to give further guidelines for applications and to make it an
28、objective to design instruments that give warnings when results are not reliable. This International Standard gives guidelines and requirements for the application of new methods for the measurement of sound insulation in buildings and building elements and for the measurement of reverberation time
29、and related quantities. Reference is made to the standards for the classical methods regarding what to measure, the number and the selection of measurement points, and the conditions for measurements. EN ISO 18233:2006blank1Acoustics Application of new measurement methods in building and room acoust
30、ics 1 Scope This International Standard gives guidelines and specifies requirements for the application of new methods for the measurement of the acoustic properties of buildings and building elements. Guidelines and requirements for selection of the excitation signal, signal processing and environm
31、ental control are given, together with requirements for linearity and time-invariance for the systems to be tested. This International Standard is applicable to such measurements as airborne sound insulation between rooms and of faades, measurement of reverberation time and other acoustic parameters
32、 of rooms, measurement of sound absorption in a reverberation room, and measurement of vibration level differences and loss factor. This International Standard specifies methods to be used as substitutes for measurement methods specified in standards covering classical methods, such as ISO 140 (all
33、parts), ISO 3382 (all parts) and ISO 17497-1. 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 a
34、mendments) applies. IEC 61260, Electroacoustics Octave-band and fractional-octave-band filters IEC 61672-1, Electroacoustics Sound level meters Part 1: Specifications 3 Terms definitions and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the following terms and defini
35、tions apply. 3.1.1 classical method conventional method of measurement where the resulting sound pressure levels or decay rates are determined directly from the recorded responses to random noise or impulse signals 3.1.2 new method measurement method in which various deterministic signals can be use
36、d to first obtain the impulse response of the system under test and from which the required sound pressure levels and decay rates can be obtained NOTE The new methods may have additional, intentional features such as giving results under situations where no result is obtained by the classical method
37、. The new methods may, for instance, be more immune to noise from other sources. EN ISO 18233:20062 3.1.3 effective signal-to-noise ratio signal-to-noise ratio ten times the logarithm to the base 10 of the ratio of the mean-square value of the signal part caused by the excitation and obtained by the
38、 new method, to the mean-square value of the unwanted part of the signal obtained by the same method and caused by sources other than the excitation NOTE 1 The effective signal-to-noise ratio is expressed in decibels. NOTE 2 The effective signal-to-noise ratio is used as a substitute for the normal
39、signal-to-noise ratio when establishing procedures for the new method based on a classical method. 3.1.4 peak-to-noise ratio ten times the logarithm to the base 10 of the ratio of the squared peak value of the signal part caused by the excitation and obtained by the new method, to the mean-square va
40、lue of the unwanted part of the signal obtained by the same method and caused by other sources than the excitation NOTE The effective peak-to-noise ratio is expressed in decibels. 3.1.5 fractional-octave band frequency range, in hertz, from lower to higher band edge frequency for a fractional-octave
41、-band filter as specified in IEC 61260 NOTE Both full-octave- and fractional-octave-band filters are designated fractional-octave-band filters. 3.2 Abbreviated terms MLS Maximum length sequence method SS Swept-sine method 4 Designations 4.1 Maximum length sequence method (MLS) An MLS method in accor
42、dance with this International Standard shall be designated as “ISO 18233MLS”. 4.2 Swept-sine method (SS) An SS method in accordance with this International Standard shall be designated as “ISO 18233SS”. 5 Theory 5.1 General The transmission of sound within a room as well as the transmission of sound
43、 between rooms may normally be considered as a close approximation to a linear and time-invariant system. The general theory applicable to such systems may therefore be used to establish the relationship between excitation and response for the sound transmission. The impulse response is the basis of
44、 all measurements. The methods are applicable to the velocities measured on structures as well as to sound pressures measured in rooms. EN ISO 18233:200635.2 Sound in a room The scope of Parts 3 to 5 of ISO 140 and of Parts 9 to 12 of ISO 140 is to specify methods to measure the airborne sound insul
45、ation for building elements and the insulation between dwellings. ISO 3382 (all parts) specifies the measurement of reverberation time. In order to measure these quantities, the sound pressure level and the reverberation time in rooms by the application of noise excitation shall be measured. For the
46、 measurement of reverberation time, the noise source is switched on for a time sufficient to obtain a steady level. The source is thereafter switched off, and the decay of the sound in the room is observed. The time for switching the noise off is set to t = 0 in this International Standard. A record
47、ing of the sound pressure level versus time will, in general, contain information on the obtained stationary sound pressure level in the room as well as the reverberation time. A typical level versus time diagram is shown in Figure 1. The stationary sound pressure level before the sound source is sw
48、itched off is given by the recording for t 0, and information about the decay will be given for t W 0. The decay may be further processed to obtain the reverberation time. Key L0stationary noise level before the excitation is switched off LNbackground noise level t time NOTE The excitation is switch
49、ed off at time t = 0. Figure 1 Typical level versus time curve The classical methods for the measurement of airborne sound in rooms, defined in the ISO 140 and ISO 3382 series, specify a stochastic signal for the excitation. Although the room in most cases may be described as a deterministic system, statistical spread from the random excitation will lead to a certain stochastic variation in the result, which may be characterized by a standard deviation. Therefore, averaging of more measurements is normally needed to obtain results close to the stochastically e
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