1、January 2010DEUTSCHE NORM English price group 10No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91.120.20!$Nv“1564383w
2、ww.din.deDDIN EN ISO 11691Acoustics Measurement of insertion loss of ducted silencers without flow Laboratory survey method (ISO 11691:1995)English version of DIN EN ISO 11691:2010-01Akustik Messung des Einfgungsdmpfungsmaes von Schalldmpfern in Kanlen ohneStrmung Laborverfahren der Genauigkeitsklas
3、se 3 (ISO 11691:1995)Englische Fassung DIN EN ISO 11691:2010-01SupersedesDIN EN ISO 11691:1996-02www.beuth.deDocument comprises 16 pagesDIN EN ISO 11691:2010-01 2 National foreword This standard has been prepared by Technical Committee ISO/TC 43 “Acoustics”, Subcommittee SC 1 “Noise” (Secretariat: D
4、S, Denmark), Working Group WG 36 “Acoustics Methods for determination of the acoustical performance of noise attenuating devices” in collaboration with Technical Committee CEN/TC 211 “Acoustics” (Secretariat: DS, Denmark). The responsible German body involved in its preparation was the Normenausschu
5、ss Akustik, Lrmminderung und Schwingungstechnik im DIN und VDI (Acoustics, Noise Control and Vibration Engineering Standards Committee in DIN and VDI), Working Committee NA 001-02-02 AA Schallschutzeinrichtungen (Schall-dmpfer, Kapseln, elastische Lagerung), Working Group NA 001-02-02-01 AK Schallsc
6、hutz in Strmungs-kanlen. Amendment of the European Machinery Directive has made it necessary to review Annex Z in terms of the essential requirements of EU Directive 98/37/EC and the revised Directive, 2006/42/EC. The technical substance of the standard has not been changed. The DIN Standards corres
7、ponding to the International Standards referred to in this document are shown below. The IEC numbers are listed in the currently valid five-digit versions, although they are cited in the text by their last three or four digits only (i.e. without “60”). ISO 3741 DIN EN ISO 3741 ISO 3743-1 DIN EN ISO
8、3743-1 ISO 3744 DIN EN ISO 3744 ISO 5725-1 DIN ISO 5725-1 ISO 7235 DIN EN ISO 7235 ISO 9614-1 DIN EN ISO 9614-1 ISO 9614-2 DIN EN ISO 9614-2 IEC 60651 DIN EN 61672 (all parts) IEC 60804 DIN EN 61672 (all parts) IEC 60942 DIN EN 60942 IEC 61260 DIN EN 61260 The national standards are given in Annex N
9、A “Bibliography”. Amendments This standard differs from DIN EN ISO 11691:1996-02 as follows: a) Annexes ZA and ZB have been supplemented to show the relationship between this standard and the Machinery Directive 98/37/EC and the new revised Machinery Directive 2006/42/EC. Previous editions DIN EN IS
10、O 11691: 1996-02 DIN EN ISO 11691:2010-01 3 National Annex NA (informative) Bibliography DIN EN 60942, Electroacoustics Sound calibrators DIN EN 61260, Electroacoustics Octave-band and fractional-octave-band filters DIN EN 61672-1, Electroacoustics Sound level meters Part 1: Specifications DIN EN 61
11、672-2, Electroacoustics Sound level meters Part 2: Pattern evaluation tests DIN EN 61672-3, Electroacoustics Sound level meters Part 3: Periodic tests DIN EN ISO 3741, Acoustics Determination of sound power levels of noise sources using sound pres-sure Precision methods for reverberation rooms DIN E
12、N ISO 3743-1, Acoustics Determination of sound power levels of noise sources Engineering methods for small, movable sources in reverberant fields Part 1: Comparison method for hard-walled test rooms DIN EN ISO 3744, Acoustics Determination of sound power levels of noise sources using sound pres-sure
13、 Engineering method in an essential free field over a reflecting plane DIN EN ISO 7235, Acoustics Laboratory measurement procedures for ducted silencers and air-terminal units Insertion loss, flow noise and total pressure loss DIN EN ISO 9614-1, Acoustics Determination of sound power levels of noise
14、 sources using sound inten-sity Part 1: Measurement at discrete points DIN EN ISO 9614-2, Acoustics Determination of sound power levels of noise sources using sound inten-sity Part 2: Measurement by scanning DIN ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results Part 1:
15、 General principles and definitions DIN EN ISO 11691:2010-01 4 This page is intentionally blank EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 11691August 2009ICS 91.120.20 Supersedes EN ISO 11691:1995 English VersionAcoustics - Measurement of insertion loss of ducted silencerswithout flow -
16、Laboratory survey method (ISO 11691:1995)Acoustique - Dtermination de la perte dinsertion desilencieux en conduit sans coulement - Mthode demesurage en laboratoire (ISO 11691:1995)Akustik - Messung des Einfgungsdmpfungsmaes vonSchalldmpfern in Kanlen ohne Strmung -Laborverfahren der Genauigkeitsklas
17、se 3 (ISO11691:1995)This European Standard was approved by CEN on 3 August 2009.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 standard without any alteration. Up-to-date lists and bib
18、liographical references concerning such nationalstandards 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 translationunder the responsibility o
19、f a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland
20、, 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 NORMUNGManagement Centre: Avenue Marnix 17, B-100
21、0 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 11691:2009: EContents Page Foreword .3 Introduction.4 1 Scope .5 2 Normative references .5 3 Definitions .6 4 Test facility 6 5 Test procedure 8 6 Information to be
22、recorded 9 7 Information to be reported 9 Annex A Bibliography 10 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC11 Annex ZB (informative) Relationship between this European Standard and the Essential Requirements of EU Direc
23、tive 2006/42/EC12 2 DIN EN ISO 11691:2010-01 EN ISO 11691:2009 (E) Foreword The text of ISO 11691:1995 has been prepared by Technical Committee ISO/TC 43 “Acoustics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 11691:2009 by Technical Committee CEN/TC
24、 211 “Acoustics” the secretariat of which is held by DS. 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 January 2010, and conflicting national standards shall be withdrawn at the latest by Januar
25、y 2010. 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. This document supersedes EN ISO 11691:1995. This document has been prepared un
26、der a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directives. For relationship with EC Directives, see informative Annexes ZA and ZB, which are integral parts of this document. According to the CEN/CENELEC Interna
27、l Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta
28、, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 11691:1995 has been approved by CEN as a EN ISO 11691:2009 without any modification. 3 DIN EN ISO 11691:2010-01 EN ISO 11691:2009 (E) Introducti
29、on The insertion loss of absorbent silencers is generally not affected by the air flow, provided that the flow velocity does not exceed approximately 20 m/s in the narrowest cross-section of the silencer. In practice, non- uniform flow distributions must be considered, therefore the limit velocity o
30、f 20 m/s corresponds to a design velocity of 10 m/s to 15 m/s. 4 DIN EN ISO 11691:2010-01 EN ISO 11691:2009 (E) 1 Scope 1.1 General This International Standard specifies a laboratory sub- stitution method to determine the insertion loss without flow of ducted, mainly absorbent, circular and rectangu
31、lar silencers, as well as other duct elements for use in ventilating and air-conditioning systems. NOTE 1 Laboratory measurement procedures for ducted silencers with superimposed flow are described in IS0 7235. This International Standard is applicable to silencers where the design velocity does not
32、 exceed 15 m/s. As the method does not include self-generated flow noise, this International Standard is not suitable for tests on silencers where this type of noise is of great importance for the evaluation of the silencer per- formance. The insertion loss determined according to this Inter- nation
33、al Standard in a laboratory will not necessarily be the same as the insertion loss that will be obtained in an installation in the field. Different sound and flow fields in the duct will yield different results. As this International Standard requires regular test ducts, the results may include some
34、 flanking transmission via structural vibrations in the duct walls, that sets an upper limit to the insertion loss that can be deter- mined. NOTE 2 IS0 7235 gives methods for determining this limit. This International Standard is intended to be used for circular silencers with diameters of 80 mm to
35、2 000 mm or rectangular silencers with cross- sectional areas within the same range. 1.2 Measurement uncertainty Exact information on the precision of the method cannot be given at this time. Therefore this Inter- national Standard is denoted a survey standard. Interlaboratory tests are necessary fo
36、r the determi- nation of the standard deviation of reproducibility, OR, of the method (relevant terms and methods are given in IS0 5725-l). It is, however, estimated that this method will have a OR which is comparable to that of IS0 7235. See table 1. Table 1 - Estimated values of the standard devia
37、tion of reproducibility Midband frequencies of Standard deviation of one-third-octave band reproducibility, OR Hz dB 50 to 1 250 2 1600tol0000 3 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standa
38、rd. At the time of publi- cation, 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 re- cent editions of the standards indicated below. Members of
39、 IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 3741 :I 988, Acoustics - Determination of sound power levels of noise sources - Precision methods for broad-band sources in reverberation rooms. 5 DIN EN ISO 11691:2010-01 EN ISO 11691:2009 (E) IS0 3743-l :I 994, Acous
40、tics - Determination of sound power levels of noise sources - Engineering methods for small, movable sources in reverberant fields - Part 1: Comparison method for hard-walled test rooms. IS0 3744:1994, Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineerin
41、g method in an essentially free field over a reflecting plane. IS0 7235:1991, Acoustics - Measurement pro- cedures for ducted silencers - Insertion loss, flow noise and total pressure loss. IS0 9614-1 :I 993, Acoustics - Determination of sound power levels of noise sources using sound in- tensity -
42、Part 1: Measurement at discrete points. IEC 651 :I 979, Sound level meters, and Amendment 1:1993. I EC 804: 1985, Integrating-averaging sound level me- ters, Amendment 1 :I 989 and Amendment 2:1993. I EC 942: 1988, Sound calibrators. I EC 1260:1, Electroacoustics - Octave-band and fractional-octave-
43、band filters. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 insertion loss, D: Reduction in level of sound power propagating through a duct due to the insertion of a silencer into the duct system in place of a sub- stitution duct. It is expressed
44、 in decibels. 3.2 test duct: Straight standard duct of constant cross-section in front of and behind the silencer under test. The purpose of the test ducts is to separate the test object from the sound source and the reverberation room. 3.3 substitution duct: Standard duct element hav- ing, if possi
45、ble, the same length and same connecting cross-sections as the test object. It is conical if the cross-sectional areas of the entrance and exit of the silencer are different from each other. If the planes of the connections of the silencer are not parallel to each other, the connections shall be mad
46、e with smooth curved ducts with a bend radius of the walls as large as possible. 3.4 transition element: Element which fits and connects the duct of the sound source to the test duct and, in some cases, the test duct to the silencer. 3.5 standard duct: Sheet metal duct commercially available directl
47、y from stock and normally used in practical applications together with the silencer under test. NOTE 3 Normal wall thicknesses for standard ducts lie in the range 0,4 mm for small circular ducts to I,25 mm for large circular ducts. A common thickness for rectangular ducts is 0,9 mm. 4 Test facility
48、4.1 General The test facility shall consist of the equipment shown in figure 1. It contains the following: - the sound measuring equipment (see 4.2); - the sound source equipment (see 4.3); - the transition element(s) (see 4.4); - the test ducts (see 4.5); - the substitution duct (see 4.5); - the me
49、asurement environment appropriate to the standard used to determine the sound power level. NOTE 4 If IS0 3741 is used to determine the sound power level, a reverberation room is used (see 4.6). This is the preferred method. 4.2 Sound measuring equipment The instrumentation system, including the micro- phone and cable, shall meet the requirements for a type 1 instrument specified in IEC 651 or, in the case of integrating-averaging sound level meters, the re- quirements of IEC 804. Filters shal
