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1、BRITISH STANDARD BS EN ISO 5136:2003 BS 848-2.5:2003 Incorporating Corrigendum No. 1 Acoustics Determination of sound power radiated into a duct by fans and other air-moving devices In-duct method The European Standard EN ISO 5136:2003 has the status of a British Standard ICS 17.140.20; 23.120 ? Lic
2、ensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 07:05:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 5136:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 17 April 2003 BSI 6 August 2003 ISBN 0 580 41576 7 National foreword T
3、his British Standard is the official English language version of EN ISO 5136:2003. It is identical with ISO 5136:2003. It supersedes BS EN 25136:1994 which is withdrawn and partially supersedes BS 848-2:1985. The UK participation in its preparation was entrusted by Technical Committee EH/1, Acoustic
4、s, to Subcommittee EH/1/4, Machinery noise, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this documen
5、t may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Us
6、ers are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for chang
7、e, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank pag
8、e, pages 1 to 68, the Annex ZA page, the Annex ZB page, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 14617 Corrigendum No. 1 6 August 2003 Corrected EN I
9、SO foreword page and incorporating the Annex ZA page and the Annex ZB page Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 07:05:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5136 April 2003 ICS 17.140.20; 23.120Supersedes EN 25136:1993
10、 English version Acoustics - Determination of sound power radiated into a duct by fans and other air-moving devices - In-duct method (ISO 5136:2003) Acoustique - Dtermination de la puissance acoustique rayonne dans un conduit par des ventilateurs et dautres systmes de ventilation - Mthode en conduit
11、 (ISO 5136:2003) Akustik - Bestimmung der von Ventilatoren und anderen Strmungsmaschinen in Kanle abgestrahlten Schallleistung - Kanalverfahren (ISO 5136:2003) This European Standard was approved by CEN on 11 March 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
12、 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 Management Centre or to any CEN member. This European Standar
13、d 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 Management Centre has the same status as the official versions. CEN members are the national standards
14、 bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION E
15、UROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5136:2003 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 07:05:03 GMT+00:00 2006
16、, Uncontrolled Copy, (c) BSI CORRECTED 2003-07-16 Foreword This document (EN ISO 5136:2003) has been prepared by Technical Committee ISO/TC 43 “Acoustics“ in collaboration with Technical Committee CEN/TC 211 “Acoustics“, the secretariat of which is held by DS. This European Standard shall be given t
17、he status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2003, and conflicting national standards shall be withdrawn at the latest by October 2003. This document supersedes EN 25136:1993. This document has been prepared under a mandate
18、given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZB, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the
19、 national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switze
20、rland and the United Kingdom. Endorsement notice The text of ISO 5136:2003 has been approved by CEN as EN ISO 5136:2003 without any modifications. NOTE Normative references to International Standards are listed in Annex ZA (normative). EN ISO 5136:2003 Licensed Copy: sheffieldun sheffieldun, na, Sat
21、 Nov 18 07:05:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 5136:2003(E) INTERNATIONAL STANDARD ISO 5136 Second edition 2003-04-01 Acoustics Determination of sound power radiated into a duct by fans and other air-moving devices In-duct method Acoustique Dtermination de la puissa
22、nce acoustique rayonne dans un conduit par des ventilateurs et dautres systmes de ventilation Mthode en conduit EN ISO 5136:2003 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 07:05:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 5136:2003(E) DPlcsid Fremia ihTs PDF file mya ctnoian emdebt
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28、O 3002 All irhgts seredevr iii Contents Page Forewordiv Introduction v 1 Scope1 1.1 General.1 1.2 Types of sound source.1 2 Normative references .2 3 Terms, definitions and symbols2 4 Uncertainty of the measurement method.7 5 Test facilities and instrumentation8 5.1 General requirements.8 5.2 Duct s
29、pecifications .9 5.3 Instrumentation.16 5.4 System calibration 19 6 Test arrangement20 6.1 Sampling tube mounting20 6.2 Microphone position.20 6.3 Operating condition control equipment .21 7 Test procedure 21 7.1 Operating conditions21 7.2 Sound pressure level readings21 7.3 Measurements with and wi
30、thout 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 recorded 24 10 Information to be reported.24 Annex A (norma
31、tive) 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) Computational procedures for calculating the A-weighted sound power le
32、vel from one-third-octave-band sound power levels.34 Annex D (informative) Example of calculation of C3,4 for a given duct diameter and mean flow velocity.35 Annex E (informative) Guidelines for the design and construction of an anechoic termination.38 Annex F (informative) Evaluation of performance
33、 of anechoic terminations 47 Annex G (informative) Sampling tube information50 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 the swirl component65 Bibliography .66 iii EN ISO 5136:2003 Licens
34、ed Copy: sheffieldun sheffieldun, na, Sat Nov 18 07:05:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 5136:2003(E) vi I SO 3002 All irhgts seredevr Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wor
35、k 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-governme
36、ntal, 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 m
37、ain 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. A
38、ttention 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 5136 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. This seco
39、nd edition cancels and replaces the first edition (ISO 5136:1990), which has been technically revised. iv EN ISO 5136:2003 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 07:05:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 5136:2003(E) I SO 3002 All irhgts seredevr v Introduction This Int
40、ernational 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 sound pressure levels to calculate the sound power levels radiated by the fan to the duct system. Annex A lists values of coefficients for the determ
41、ination of the combined mean flow velocity and modal correction. Annex B specifies two procedures for the determination of the signal-to-noise ratio of sound versus turbulence. A computational procedure for the calculation of the A-weighted sound power level from one-third- octave band levels is giv
42、en 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 by 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
43、, the test duct has, therefore, to be clearly specified. In this International Standard, the test duct is of circular cross-section and terminated anechoically. Details of typical anechoic terminations are given in Annex E. The sound power obtained under these special conditions is a representative
44、value for actual applications, as the anechoic termination forms an impedance about midway between the higher and lower impedances found in practice. The sound power radiated in actual applications can, in theory, be estimated from data on air-moving devices and duct impedances. Since this informati
45、on is at present incomplete, these effects are not usually considered in acoustical calculations. In order to suppress the turbulent pressure fluctuations at the microphone, the use of a long cylindrical windscreen (“sampling tube”) is preferred. The microphone, with the sampling tube, is mounted at
46、 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 frequency range in which higher-order acoustic modes are possible. The uncertainty of measurement (see Clause 4) is given in terms of the standard deviati
47、on to be expected if the measurements were repeated in many different laboratories. The procedures for measuring the operating conditions (performance measurements) are not specified in detail in this International Standard. The operating conditions are specified in ISO 5801. This International Stan
48、dard 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 powers 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
49、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 radiated 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 met