1、BRITISH STANDARD BS 7698-10: 1999 ISO 8528-10: 1998 Reciprocating internal combustion engine driven alternating current generating sets Part 10: Measurement of airborne noise by the enveloping surface method ICS 17.140.20; 29.160.40BS7698-10:1999 This British Standard, having been prepared under the
2、 directionof the Engineering SectorCommittee, was publishedunder the authority ofthe Standards Committee andcomes into effect on 15 January1999 BSI 05-1999 ISBN 0 580 30982 7 National foreword This British Standard reproduces verbatim ISO8528-10:1998and implements it as the UK national standard. The
3、 UK participation in its preparation was entrusted to Technical Committee MCE/14, RIC engines, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the
4、 UKinterests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publicatio
5、ns referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provision
6、s of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISOtitlepage, pag
7、eii, pages1 to14 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS7698-10:1999 BSI 05-1999 i Contents Pa
8、ge National foreword Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Terms and definitions 2 4 Symbols 2 5 Other regulations and requirements 2 6 Designation of the method 2 7 Measuring equipment 3 8 Measuring object 3 9 Operating conditions of the generating set 3 10 Measuring s
9、urface, measuring distances and measuring points 3 11 Measuring environment 8 12 Measurement procedure 9 13 Determination of the A-weighted sound power level 10 14 Determination of the emission sound pressure level 12 15 Accuracy of the procedure and uncertainty of the measurement results 12 16 Meas
10、urement report (measurement record) 12 17 Summary report 13 Annex A (informative) Relation to existing EEC-directives 14 Bibliography 14 Figure 1 Measuring point arrangement (nine measuring points) and measuring plane for generating sets with the referencerectanglemeasurements: l 1 4m; l 3 4m and/or
11、 l 3 2,5m 8 Figure 5 Direction of microphone on the corner 9 Table 1 Correction factors for K 1A 10ii blankBS7698-10:1999 ii BSI 05-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing
12、 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, in liais
13、on 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, Part3. Draft International
14、Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. This part of ISO8528 was prepared by ISO Technical Committee ISO/TC70, Internal combustion engi
15、nes. ISO8528 consists of the following parts under the general title Reciprocating internal combustion engine driven alternating current generating sets: Part 1: Application, ratings and performance; Part 2: Engines; Part 3: Alternating current generators for generating sets; Part 4: Controlgear and
16、 switchgear; Part 5: Generating sets; Part 6: Test methods; Part 7: Technical declarations for specification and design; Part 8: Requirements and tests for low-power generating sets; Part 9: Measurement and evaluation of mechanical vibrations; Part 10: Measurement of airborne noise by the enveloping
17、 surface method; Part 11: Dynamic, uninterrupted power supply systems; Part 12: Emergency power supply to safety services. Annex A and the Bibliography of this part of ISO8528 are for information only. Descriptors: Generating sets, motor generator sets, noise (sound), engine noise, airborne sound, t
18、ests, acoustic tests, acoustic measurements.BS7698-10:1999 BSI 05-1999 1 1 Scope This part of ISO8528 defines measurement methods for the determination of airborne noise emitted by reciprocating internal combustion engine driven generating sets in such a way that the total of relevant noise emission
19、s, e.g.exhaust and cooling system noise, together with all other sources of engine noise, are evaluated on a similar basis to yield comparable results. However, when the exhaust and cooling systems are ducted to a remote site their noise contribution is not to be included in this part of ISO8528. Th
20、e essential noise emission characteristic value is the sound power level. The results of measurement taken in accordance with this part of ISO8528 are classified as either accuracy grade2or grade3 depending on which acoustic measurement conditions are complied with. Accuracy grade2 (i.e.,engineering
21、 method in accordance with ISO3744) requires the measuring area to be a substantially acoustic-free field over a reflecting plane (with an environmental correction K 2A 2dB) and with negligible background noise level (background noise correction K 1A 1,3dB). Accuracy grade3 (i.e.survey method in acc
22、ordance with ISO3746) requires the environmental correction K 2Ato be less or equal than7dB, and the background noise correction K 1Ato be less or equal than3dB. For the operation of a generating set under steady conditions this part of ISO8528 allows for the calculation of the A-weighted sound powe
23、r level as well as appropriate octave or one third octave sound power level for the appropriate accuracy grade. This part of ISO8528 applies to RIC engine driven AC generating sets for fixed and mobile applications with rigid or flexible mountings. It is applicable for land and marine use, excluding
24、 generating sets used on aircraft or to propel land vehicles and locomotives. NOTE 1This part of ISO8528 has been developed for RIC engine driven AC generating sets, but it can also be applied to RIC engine driven DC generating sets. NOTE 2For some specific applications (e.g.essential hospital suppl
25、ies, high rise buildings, etc.) supplementary requirements may be necessary. The provisions of this part of ISO8528 should be regarded as a basis. NOTE 3True comparisons can only be made between generating sets when the measurement are classified in the same accuracy grade. 2 Normative references Th
26、e following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO8528. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO85
27、28 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Stand
28、ards. ISO700:, Arc welding equipment Welding power sources 1) . ISO3046-1:1995, Reciprocating internal combustion engines Performance Part1:Standard reference conditions, declarations of power, fuel and lubricating oil consumptions and test methods. ISO3744:1994, Acoustics Determination of sound pow
29、er levels of noise sources using sound pressure Engineering method in an essentially free field over a reflecting plane. ISO3746:1995, Acoustics Determination of sound power levels of noise sources using sound pressure Survey method using an enveloping measurement surface over a reflecting plane. IS
30、O8528-1:1993, Reciprocating internal combustion engine driven alternating current generating sets Part1:Application, ratings and performance. ISO8528-2:1993, Reciprocating internal combustion engine driven alternating current generating sets Part2:Engines. ISO9614-1:1993, Acoustics Determination of
31、sound power levels of noise sources using sound intensity Part1:Measurement at discrete points. IS09614-2:1996, Acoustics Determination of sound power levels of noise sources using sound intensity Part2:Measurement by scanning. ISO11203:1995, Acoustics Noise emitted by machinery and equipment Determ
32、ination of emission sound pressure levels at a work station and at other specified positions from the sound power level. IEC60804:1985, Integrating-averaging sound level meters. 1) To be published. (Revision of ISO700:1982)BS7698-10:1999 2 BSI 05-1999 3 Terms and definitions For the purposes of this
33、 part of ISO8528 the following terms and definitions apply: for acoustics, those in accordance with ISO3744 and ISO 3746; for the reciprocating internal combustion engine the terms in accordance with ISO3046-1; for generating sets the terms in accordance with ISO8528-1 and ISO8528-2. 4 Symbols 5 Oth
34、er regulations and requirements 5.1 For generating sets used on board ships and offshore installations which have to comply with the rules of a classification society, the additional requirements of the classification society shall be observed. The classification society shall be stated by the custo
35、mer prior to placing the order. For nonclassed generating sets, such additional requirements are in each case subject to agreement between the manufacturer and customer. 5.2 If special requirements from regulations of any other authority, e.g.inspecting and/or legislative authorities, have to be met
36、, the authority shall be stated by the customer prior to placing the order. Any further additional requirements shall be subject to agreement between the manufacturer and customer. 6 Designation of the method The method of noise measurement according to this part of ISO8528, grade2, is designated as
37、 follows. Noise measurement ISO8528-10 grade2. The method of noise measurement according to this part of ISO8528, grade3, is designated as follows. Noise measurement ISO8528-10grade3. i Subscript denoting a particular measuring point K 1A Background noise correction K 2A Environmental correction Ave
38、rage octave or one third octave sound pressure level after correction for background noise and environmental influence in decibels Averaged A-weighted sound pressure level after correction for background noise and environmental influence in decibels L pAi A-weighted sound pressure level at measuring
39、 point i in decibels L pi Octave or one third octave sound pressure level at measuring point i in decibels L S Measuring surface dimension L WA A-weighted sound power level L Woct Octave sound power level L W1/3 oct One third octave sound power level n Number of measuring points S Measuring surface
40、S 0 Reference measuring surface % L p Difference of sound pressure level in decibels %L WA Difference of A-weighted sound power level cos Power factor L p L p A BS7698-10:1999 BSI 05-1999 3 7 Measuring equipment The requirements for measuring equipment are those in accordance with ISO3744 and ISO374
41、6. 8 Measuring object The noise of a generating set is defined as the total noise emitted by that generating set. This includes the surface noise of the engine and the generator, the inlet noise, exhaust noise and the noise emitted from the cooling system of the engine and the fan of the generator a
42、nd also the noise which will, for example, be emitted from the joining sections and the baseframe. In case of totally or partially encapsulated generating sets the surface noise is the noise emitted from the enclosure. If, in a special case, one of the above mentioned noise emissions is not in the m
43、easurement results then this shall be recorded in the measuring report. 9 Operating conditions of the generating set 9.1 General The generating set shall be prepared in accordance with the instructions given by the manufacturer. In practice the same generating set is operated under various operating
44、 conditions depending upon application and conditions on site, therefore other operating conditions as laid down in9.2 or9.3 may be used. For the torque a tolerance of 10% is acceptable for the acoustic results. When the measurements are taken, the ambient and air inlet temperatures shall be not hig
45、her than320K. The generating set speed, average electrical power output, ambient temperature and type of fuel and cetane index used during the test shall be recorded in the measuring report because of their influence on the noise emission. 9.2 Generating set (power generator) The generating set shal
46、l operate at a steady power output at75% of its rated power in kilowatts. The given output, i.e.the useful output calculated on the basis of the given output in kilovoltamperes under the application of the power factor (cos) shall be reported. NOTEThe operating conditions given here are identical to
47、 those defined in EEC Council Directive84/536/EEC (currently under revision) 9.3 Generating set (welding generator) This shall be driven as specified in accordance with ISO700 and produce its rated welding output against a resistance. NOTEThe operating conditions given here are identical to those de
48、fined in EEC Council Directive84/535/EEC (currently under revision) 9.4 Mounting of the generating set The generating set should be installed on a typical noise-reflecting ground plane of concrete or nonporous asphalt. The distance from the source to the next wall of the test cell should be twice th
49、e distance between source and microphone. Trailer mounted units should be installed according to the manufacturers recommendation. 10 Measuring surface, measuring distances and measuring points See Figure 1 to Figure 4. 10.1 Reference hemisphere and measuring surface For measuring the sound power level in a hemisphere, the requirement of the EC-Directives84/535/EEC and84/536/EEC shall be met. 10.2 Reference parallelelepiped and measuring surface A reference grid shall be established on the surfaces of the small
