1、BS EN ISO5136:2009ICS 17.140.20; 23.120NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAcoustics Determination ofsound power radiatedinto a duct by fansand other air-movingdevices In-ductmethod (ISO 5136:2003)This British Standardwas published under theauthority
2、 of the StandardsPolicy and StrategyCommittee on 30 April2010 BSI 2010ISBN 978 0 580 67418 1Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 5136:2009National forewordThis British Standard is the UK implementation of EN ISO 5136:2009. Itis identical to ISO 5136:2003. It supersede
3、s BS EN ISO 5136:2003 whichis withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EH/1/4, Machinery noise.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary
4、provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 5136August 2009ICS 17.140.20; 23.120 Supersedes EN ISO 5136:2003 English VersionAcoustics -
5、 Determination of sound power radiated into a duct byfans and other air-moving devices - In-duct method (ISO5136:2003)Acoustique - Dtermination de la puissance acoustiquerayonne dans un conduit par des ventilateurs et dautressystmes de ventilation - Mthode en conduit (ISO5136:2003)Akustik - Bestimmu
6、ng der von Ventilatoren und anderenStrmungsmaschinen in Kanle abgestrahltenSchallleistung - Kanalverfahren (ISO 5136:2003)This European Standard was approved by CEN on 20 July 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thi
7、s EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical 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 (En
8、glish, French, German). A version in any other language made by translationunder the responsibility of 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,
9、 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 STANDARDIZATIONC
10、OMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 5136:2009: EBS EN ISO 5136:2009EN ISO 5136:2009 (E) 3 Foreword T
11、he text of ISO 5136:2003 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 5136:2009 by Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS. This European Standard
12、 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2010, and conflicting national standards shall be withdrawn at the latest by February 2010. Attention is drawn to the possibility that some of the elements of th
13、is 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 5136:2003. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Tr
14、ade 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 Internal Regulations, the national standards organizations of the following countries
15、 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, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, S
16、weden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 5136:2003 has been approved by CEN as a EN ISO 5136:2009 without any modification. BS EN ISO 5136:2009EN ISO 5136:2009 (E) 4 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements
17、 of EU Directive 98/37/EC This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Directive 98/37/EC, amended by 98/79/EC on machinery. Once
18、 this standard is cited in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard confers, within the limits of the scope of this standard, a presumptio
19、n of conformity with the relevant Essential Requirements of that Directive and associated EFTA regulations. WARNING - Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard. BS EN ISO 5136:2009EN ISO 5136:2009 (E) 5 Annex ZB (informat
20、ive) Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requiremen
21、ts of the New Approach Directive 2006/42/EC on machinery. Once this standard is cited in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard confers,
22、 within the limits of the scope of this standard, a presumption of conformity with the relevant Essential Requirements of that Directive and associated EFTA regulations. WARNING Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard.
23、BS EN ISO 5136:2009ISO 5136:2003(E) ISO 2003 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 1.1 General. 1 1.2 Types of sound source. 1 2 Normative references . 2 3 Terms, definitions and symbols 2 4 Uncertainty of the measurement method.7 5 Test facilities and instrumenta
24、tion 8 5.1 General requirements . 8 5.2 Duct specifications . 9 5.3 Instrumentation . 16 5.4 System calibration 19 6 Test arrangement 20 6.1 Sampling tube mounting 20 6.2 Microphone position. 20 6.3 Operating condition control equipment .21 7 Test procedure 21 7.1 Operating conditions 21 7.2 Sound p
25、ressure level readings 21 7.3 Measurements with and without flow straightener on the outlet side 22 7.4 Inlet side measurements Large fans: installation category D (according to ISO 5801:1997). 22 8 Calculations. 23 8.1 Average sound pressure level. 23 8.2 Sound power level 23 9 Information to be re
26、corded 24 10 Information to be reported . 24 Annex A (normative) Determination of the combined mean flow velocity and modal correction C3,425 Annex B (normative) Determination of the signal-to-noise ratio of sound vs. turbulent pressure fluctuation in the test duct . 31 Annex C (normative) Computati
27、onal procedures for calculating the A-weighted sound power level from one-third-octave-band sound power levels. 34 Annex D (informative) Example of calculation of C3,4for a given duct diameter and mean flow velocity. 35 Annex E (informative) Guidelines for the design and construction of an anechoic
28、termination. 38 Annex F (informative) Evaluation of performance of anechoic terminations 47 Annex G (informative) Sampling tube information 50 Annex H (informative) Test method for small ducted fans. 54 Annex I (informative) Test method for large ducted fans. 58 Annex J (informative) Measurement of
29、the swirl component 65 Bibliography . 66 BS EN ISO 5136:2009ISO 5136:2003(E) iv ISO 2003 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is n
30、ormally 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 i
31、n 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 prep
32、are 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 s
33、ome 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 5136 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. This second edition cancels and replaces the first e
34、dition (ISO 5136:1990), which has been technically revised. BS EN ISO 5136:2009ISO 5136:2003(E) ISO 2003 All rights reserved vIntroduction This International Standard describes a procedure for the measurement of sound pressure levels in the inlet or outlet ducts of a fan and a method to use these so
35、und pressure levels to calculate the sound power levels radiated by the fan to the duct system. Annex A lists values of coefficients for the determination of the combined mean flow velocity and modal correction. Annex B specifies two procedures for the determination of the signal-to-noise ratio of s
36、ound versus turbulence. A computational procedure for the calculation of the A-weighted sound power level from one-third-octave band levels is given in Annex C. Annex D shows an example of the calculation of the combined mean flow velocity and modal correction. The sound power radiated into a duct b
37、y a fan or other air-moving device depends to some extent on the type of duct, characterized by its acoustical impedance. For a measurement method, the test duct has, therefore, to be clearly specified. In this International Standard, the test duct is of circular cross-section and terminated anechoi
38、cally. Details of typical anechoic terminations are given in Annex E. The sound power obtained under these special conditions is a representative value for actual applications, as the anechoic termination forms an impedance about midway between the higher and lower impedances found in practice. The
39、sound power radiated in actual applications can, in theory, be estimated from data on air-moving devices and duct impedances. Since this information is at present incomplete, these effects are not usually considered in acoustical calculations. In order to suppress the turbulent pressure fluctuations
40、 at the microphone, the use of a long cylindrical windscreen (“sampling tube”) is preferred. The microphone, with the sampling tube, is mounted at a radial position such that the sound pressure is well related to the sound power by the plane wave formula to an acceptable extent, even in the frequenc
41、y range in which higher-order acoustic modes are possible. The uncertainty of measurement (see Clause 4) is given in terms of the standard deviation to be expected if the measurements were repeated in many different laboratories. The procedures for measuring the operating conditions (performance mea
42、surements) are not specified in detail in this International Standard. The operating conditions are specified in ISO 5801. This International Standard is one of a series specifying different methods for determining the sound power levels of fans and other air-moving devices. In general, the sound po
43、wers radiated from a fan inlet or outlet into free space and into a duct are different because of the reflection of sound energy at the fan inlet or outlet plane when there is no connected duct. The in-duct method according to this International Standard is suitable for determining the sound power r
44、adiated into a duct by a fan inlet or outlet. The sound power radiated into free space by a fan inlet or outlet should be determined using the a reverberation room method (ISO 3741, ISO 3743), a free-field method (ISO 3744, ISO 3745, ISO 3746) or a sound intensity method (ISO 9614). BS EN ISO 5136:2
45、009BS EN ISO 5136:2009INTERNATIONAL STANDARD ISO 5136:2003(E) ISO 2003 All rights reserved 1Acoustics Determination of sound power radiated into a duct by fans and other air-moving devices In-duct method 1 Scope 1.1 General This International Standard specifies a method for testing ducted fans and o
46、ther air-moving devices to determine the sound power radiated into an anechoically terminated duct on the inlet and/or outlet side of the equipment. NOTE 1 For the sake of brevity, wherever the term “fan” occurs in the text, it means “fan or other air-moving device”. The method is applicable to fans
47、 which emit steady, broad-band, narrow-band and discrete-frequency sound and to air temperatures between 50 C and + 70 C. The test duct diameter range is from 0,15 m to 2 m. Test methods for small (d 2 m) test ducts are described in the informative Annexes H and I, respectively. The maximum mean flo
48、w velocity at the microphone head for which the method is suitable depends on the type of microphone shield used, and is as follows: foam ball 15 m/s; nose cone 20 m/s; sampling tube 40 m/s. Above these values the suppression of turbulent pressure fluctuations by the microphone shield (see 3.9) may
49、be insufficient. It is expected that sound power tests will be conducted in conjunction with airflow performance tests in accordance with ISO 5801. The ducting arrangement will therefore normally incorporate a “star” type flow straightener on the outlet side of the fan which will minimize swirl (see 7.3). Where it is permissible to delete the straightener as, for example, with large fans to installation category C according to ISO 5801:1997, the method is limited to a swirl angle of 15. (An example of a method for determining the angle o
