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1、BRITISH STANDARD BS EN ISO 9614-2:1997 Acoustics Determination of sound power levels of noise sources using sound intensity Part 2: Measurement by scanning The European Standard EN ISO 9614-2:1996 has the status of a British Standard ICS 17.140.01 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov
2、18 02:25:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9614-2:1997 This British Standard, having been prepared under the direction of the Health and Environment Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1997 BSI 08-1999 The fol
3、lowing BSI references relate to the work on this standard: Committee reference EH/1 Draft for comment 94/502144 DC ISBN 0 580 26658 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee EH/1, Acoustics, upon which the followi
4、ng bodies were represented: Association of Consulting Engineers British Broadcasting Corporation British Occupational Hygiene Society British Telecommunications plc Department of the Environment (Building Research Establishment) Department of Health Health and Safety Executive Institute of Acoustics
5、 Institute of Occupational Hygienists Institute of Sound and Vibration Research Institution of Electrical Engineers National Physical Laboratory Royal Institute of British Architects Society of Environmental Engineers The following bodies were also represented in the drafting of the standard, throug
6、h subcommittees and panels: Advanced Manufacturing Technology Research Institute Agricultural Engineers Association British Cement Association British Compressed Air Society British Industrial Truck Association British Iron and Steel Producers Association Construction Industry Research and Informati
7、on Association Engineering Industries Association Fan Manufacturers Association Federation of the Electronics Industry Federation of Manufacturers of Construction Equipment and Cranes Federation of Piling Specialists Hevac Association Institution of Engineering Designers Institution of Mechanical En
8、gineers National Engineering Laboratory National Specialist Contractors Council Rotating Electrical Machines Association University of Liverpool University of Manchester Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:25:39
9、GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9614-2:1997 BSI 08-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Forewordii Text of ISO 9614-21 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:25:39 GMT+00
10、:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9614-2:1997 ii BSI 08-1999 National foreword This British Standard has been prepared by Technical Committee EH/1 and is the English language version of EN ISO 9614-2:1996 Acoustics Determination of sound power levels of noise sources using sound intensi
11、ty Part 2: Measurement by scanning, published by the European Committee for Standardization (CEN), which is identical with ISO 9614-2:1996 published by the International Organization for Standardization (ISO). A British Standard does not purport to include all the necessary provisions of a contract.
12、 Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference Publication referred toCorresponding British Standard IEC 942:1988BS 7189:1989 Specification for sound calibrators
13、Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, page 2, the ISO title page, page ii, pages 1 to 18, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporate
14、d. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:25:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9614-2 August 1996 ICS 17.140.00 Descriptors: See ISO docume
15、nt English version Acoustics Determination of sound power levels of noise sources using sound intensity Part 2: Measurement by scanning (ISO 9614-2:1996) Acoustique Dtermination par intensimtrie des niveaux de puissance acoustique mis par les sources de bruit Partie 2: Mesurage par balayage (ISO 961
16、4-2:1996) Akustik Bestimmung der Schalleistungspegel von Geruschquellen durch Schallintensittsmessung Teil 2: Messig mit kontinuierlicher Abtastung (ISO 9614-2:1996) This European Standard was approved by CEN on 1996-05-19. CEN members are bound to comply with the CEN/CENELEC Internal Regulations wh
17、ich 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 Central Secretariat or to any CEN member. The European Sta
18、ndards exist 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 Central Secretariat has the same status as the official versions. CEN members are the national sta
19、ndards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Ce
20、ntral Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN ISO 9614-2:1996 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:25:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9614-2:1996 BSI 08-1999 2 Foreword The text of the Internation
21、al Standard ISO 9614-2:1996 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 the status of a national standard, either by publication of an id
22、entical text or by endorsement, at the latest by February 1997, and conflicting national standards shall be withdrawn at the latest by February 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europea
23、n Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 9614-2:1996 was approved by CEN as a European
24、Standard without any modification. Contents Page Foreword2 Introduction1 1Scope2 2Normative references2 3Definitions3 4General requirements5 5Acoustic environment6 6Instrumentation7 7Installation and operation of the source7 8Measurement of normal sound intensity component levels8 9Calculation of so
25、und power level10 10Information to be reported10 Annex A (normative) Calculation of field indicators12 Annex B (normative) Procedure for achieving a desired grade of accuracy12 Annex C (informative) Effects of airflow on measurement of sound intensity15 Annex D (informative) Effect of sound absorpti
26、on within the measurement surface15 Annex E (informative) Measurement surface and scanning procedure16 Annex F (informative) Bibliography17 Figure 1 Example of a scanning pattern8 Figure B.1 Scheme for the procedure for achieving the desired grade of accuracy14 Figure E.1 Measurement surfaces for ty
27、pical planar segments16 Table 1 Bias error factor, K4 Table 2 Uncertainty in the determination of sound power levels6 Table B.1 Actions to be taken to increase grade of accuracy of determination13 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:25:39 GMT+00:00 2006, Uncontrolled Copy, (c)
28、BSI Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:25:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9614-2:1996 ii BSI 08-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of p
29、reparing 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,
30、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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Pub
31、lication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 9614-2 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. ISO 9614 consists of the following parts, under the general title Acoust
32、ics Determination of sound power levels of noise sources using sound intensity. Part 1: Measurement at discrete points; Part 2: Measurement by scanning; Part 3: Precision method for measurement by scanning. Annex A and Annex B form an integral part of this part of ISO 9614. Annex C, Annex D, Annex E
33、 and Annex F are for information only. Descriptors: Acoustics, sound sources, noise (sound), tests, acoustic tests, determination, sound power, acoustic measurements. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:25:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9614-2:1996 BSI 08-
34、19991 Introduction 0.1 The sound power radiated by a source is equal in value to the integral of the scalar product of the sound intensity vector and the associated elemental area vector over any surface totally enclosing the source. Previous International Standards which describe methods of determi
35、nation of sound power levels of noise sources, principally ISO 3740 to ISO 3747, without exception specify sound pressure level as the primary acoustic quantity to be measured. The relationship between sound intensity level and sound pressure level at any point depends on the characteristics of the
36、source, the characteristics of the measurement environment, and the disposition of the measurement positions with respect to the source. Therefore ISO 3740 to ISO 3747 necessarily specify the source characteristics, the test environment characteristics and qualification procedures, together with mea
37、surement methods which are expected to restrict the uncertainty of the sound power level determination to within acceptable limits. The procedures specified ISO 3740 to ISO 3747 are not always appropriate, for the following reasons. a) Costly facilities are necessary if high precision is required. I
38、t is frequently not possible to install and operate large pieces of equipment in such facilities. b) They cannot be used in the presence of high levels of extraneous noise generated by sources other than that under investigation. 0.2 This part of ISO 9614 specifies methods of determining the sound p
39、ower levels of sources, within specific ranges of uncertainty, under test conditions which are less restricted than those required by ISO 3740 to ISO 3747. The sound power level is the in situ sound power level as determined by the procedure of this part of ISO 9614; it is physically a function of t
40、he environment, and may in some cases differ from the sound power level of the same source determined under other conditions. It is recommended that personnel performing sound intensity measurements according to this part of ISO 9614 are appropriately trained and experienced. 0.3 This part of ISO 96
41、14 complements ISO 9614-1 and the series ISO 3740 to ISO 3747 which specify various methods for the determination of sound power levels of machines and equipment. It differs from the ISO 3740 to ISO 3747 series principally in three aspects: a) measurements are made of sound intensity as well as of s
42、ound pressure; b) the uncertainty of the sound power level determined by the method specified in this part of ISO 9614 is classified according to the results of specified ancillary tests and calculations performed in association with the test measurements; c) current limitations of intensity measure
43、ment equipment which conforms to IEC 1043 restricts measurements to the one-third-octave range 50 Hz to 6,3 kHz; band-limited A-weighted values are determined from the constituent one-octave or one-third-octave band values and not by direct A-weighted measurement. 0.4 The integral over any surface t
44、otally enclosing the source of the scalar product of the sound intensity vector and the associated elemental area vector provides a measure of the sound power radiated directly into the air by all sources located within the enclosing surface and excludes sound radiated by sources located outside thi
45、s surface. In practice, this exclusion is effective only if the source under test and other sources of extraneous intensity on the measurement surface are stationary in time. In the presence of sound sources operating outside the measurement surface, any system lying within the surface may absorb a
46、proportion of energy incident upon it. The total sound power absorbed within the measurement surface will appear as a negative contribution to source power, and may produce an error in the sound power determination. In order to minimize the associated error, it is therefore necessary to remove any s
47、ound-absorbing material lying within the measurement surface which is not normally present during the operation of the source under test. This method is based on sampling of the intensity field normal to the measurement surface by moving an intensity probe continuously along one or more specified pa
48、ths. The resulting sampling error is a function of the spatial variation of the normal intensity component over the measurement surface, which depends upon the directivity of the source, the chosen sampling surface, the pattern and speed of the probe scanning, and the proximity of extraneous sources
49、 outside the measurement surface. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:25:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9614-2:1996 2 BSI 08-1999 The accuracy of measurement of the normal component of sound intensity at a position is sensitive to the difference between the local sound pressure level and the local normal sound intensity level. A large difference may occur when the intensity vector at a measurement position is directed at a large angle (approaching 90) to the local normal to the measu