1、BRITISH STANDARD - Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part 3: Sound propagation and noise prediction in workrooms I BS EN IS0 11690-31999 British Standard ICs 13.140;17.140.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIG
2、HT LAW BS EN IS0 116903:1999 direction of the Health and Environment Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 January 1999 Amd. No. National foreword Date Text affected This British Standard is the English language version of EN IS0 1
3、16903: 1998. It is identical with ISOm 116903:19!37. The UK participation in its preparation was entrusted by Technical Committee EW1, Acoustics, to Subcommittee EWU4, Machinery noise, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible intdo - monit
4、or related international and European developments and promulgate them in the IK A list of organizations represented on this subcommittee can be obtained on request to its secrem. Cross-references Attention is dram to the fact that CEN and CENELEC standards normally include an annex which lists norm
5、ative references to international publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Cor
6、respondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does
7、not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN IS0 title page, the EN IS0 foreword page, the ISORa title page, pages ii to iv, pages 1 to 36, an inside back cover and a back cover. O BSI 01-1999 ISBN O 580 2
8、9831 O EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 116W November 1998 ICs Descriptors: See IS0 document English version Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part 3: Sound propagation and noise prediction in workrooms (ISO/TR 1 16
9、90-3:1997) Acoustique - Pratique recommande pour la conception de locaux de travail bruit rduit contenant des machines - Partie 3: Propagation du son et prvision du bruit dans les locaux de travail (ISOfiR 11690-39997) Akustik - Richtlinien fr die Gestaltung lrmarmer maschinenbestckter Arbeitssttten
10、 - Teil 3: Schallausbrebng und -vorausberechnung in Arbeitsrumen (ISOTTR 11690-39997) This European Standard was approved by GEN on 9 January 1998. CEN members are bound to comply with the CENEENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of
11、a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application io the Central Secretariat or to any GEN member. This European Standard exists in three official versions (English, French, German). A version
12、 in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Centrai Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France,
13、 Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netheriands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMTiEi FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FOR NORMUNG Central Cecretariat: rue de Stassart. 36 8-1050 Brussels Q 1998
14、CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 11690-3:1998 E - STD.BSI BS EN IS0 llb0-3-ENGL 1999 P LbZqbb 07557b3 TAL EN IS0 11690-31998 Foreword The text of the International Standard from Technical Committee ISOiTC 43 “Aco
15、ustics“ of the International Organization for Standardization (EO) has been taken over as an European Standard by Technical Committee CENiTTC 21 1 “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
16、 identical text or by endorsement, at the latest by May 1999, and conflicting national standards shall be withdrawn at the latest by May 1999. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standa
17、rd: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Warning This document was published as a European Standard to provide a harmonized base for national
18、 standards. It is a guidance document which means that it cannot be used for type-approval purposes. The guidance contained in this standard is not intended to be exhaustive, but to highlight important aspects to which attention should be given. Endorsement notice The text of the International Stand
19、ard ISO/TR 1 1690-3:1997 has been approved by CEN as a European Standard without any modification. - - STD-BSI BS EN IS0 Llb70-3-ENGL 1777 lb24bb7 0755764 LB I EN IS0 11690-3:1998 TECHNICAL REPORT ISOITR 1 169013 First edition 1997-02-1 5 Acoustics - Recommended practice for the design of low-noise
20、workplaces containing machinery - Part 3: Sound propagation and noise prediction in workrooms Acoustique - Pratique recommande pour la conception de locaux de travail bruit rduit contenant des machines - Partie 3: Propagation du son et prvision du bruit dans les locaux de travail Reference number IS
21、O/TR 1 1690-3: 1997(E) STD.BSI BS EN IS0 LLb70-3-ENGL 1777 m Lb24bb7 07557b5 854 m EN IS0 11690-3:1998 Contents Page 1 Scope 1 2 Definitions 1 3 References . 1 4 Basic principles of sound propagation in rooms . 1 5 Noise prediction in workrooms 5 6 Methodology for noise prediction in workrooms 5 7 F
22、urther aspects of noise prediction 14 Annexes A B Three case studies relating to noise prediction in workrooms 15 Prediction of the noise impact of new machines in existing workrooms . 23 C Determination of the sound pressure level at the workstation of a machine in a workroom 29 D Evaluation of the
23、 acoustical quality of a workroom 32 E Recommendation for the use of noise prediction methods . 34 F Bibliography . 35 Descriptors: acoustics. machinery. noise (sound). engine noise. noise reduction. workplaces. workroom. design. sound transmission. rules of calculation . i STD-BSI BS EN IS0 LLbSCl-
24、3-ENGL 1777 W lb24bb7 07557bb 790 EN IS0 11690-3:1998 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees.
25、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 SO, also take part in the work. IS0 collaborates closely with the Internat
26、ional Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The main task of technical committees is to prepare International Standards, but in exceptional circumstances a technical committee may propose the publication of a Technical Report of one of the following ty
27、pes: type 1, when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts; type 2, when the subject is still under technical development or where for any other reason there is the future but not immediate possibility of an agreement on an In
28、ternational Standard; type 3, when a technical committee has collected data of a different kind from that which is normally published as an International Standard (“state of the art“, for example). Technical Reports of types 1 and 2 are subject to review within three years of publication, to decice
29、whether they can be transformed into International Standards. Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide are considered to be no longer valid or useful. ISO/TR 11690-3, which is a Technical Report of type 3, was prepared by Technical Committee ISOT
30、C 43, Acoustics, Subcommittee SC 1, Noise. IS0 11690 consists of the following parts, under the general title Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part i: Noise control strategies - Part 2: Noise control measures - Part 3: Sound propagation a
31、nd noise prediction in workrooms iii STD-BSI BS EN IS0 LLbSO-3-ENGL 1999 = Lb24bbS 07557b7 b27 = EN IS0 11690-31998 Introduction This Technical Report is intended for use by all parties involved in noise reduction in workplaces and design of low-noise workplaces. The objective is: - to make them awa
32、re of what is the current technical consensus regarding sound propagation and noise prediction in workrooms, - to aid the interaction between them within a common technical framework, - to promote the understanding of the desired noise control requirements. This Technical Report provides the connect
33、ion between the emission of sound sources e.g. machines and the sound pressure level at workstations caused by their operation in a workroom. Therefore, it allows an interchange of information between machine suppliers, who are responsible for noise emission values, and machine users, who require lo
34、w noise immission values. A further target is the assessment of the acoustical performance of a workroom. These tasks are connected by the determination of the sound propagation descriptors of a workroom. A methodology for noise prediction in workrooms is presented and a structure is given for the c
35、lassification of prediction methods according to the level of detail of input parameters. iv EN IS0 11690-3:1998 Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part 3 : Sound propagation and noise prediction in workrooms 1 Scope In this part of IS0 11
36、690, sound propagation in a room is considered together with the prediction of sound pressure levels and of noise immission at the workplace. Details of the description of the physical phenomena involved in a noise prediction scheme are strongly dependent on the situation being considered and the wa
37、y this situation is modelled (input parameters, calculation techniques). This dependency is surveyed and the methodology for noise prediction is described. Recommendations are provided concerning the use of noise prediction as an aid for noise control in workrooms. Examples of use of noise predictio
38、n methods are given in annexes A to E. 2 References References listed in IS0 11690-1 should also be consulted when using this Technical Report. 3 Definitions Definitions given in IS0 1 1690-1 apply to this Technical Report. 4 Basic principles of sound propagation in rooms 4.1 Sound propagation descr
39、iptors A basic element for noise prediction in workrooms is the prediction of the distribution of sound pressure levels caused by an omnidirectional point source. This distribution is influenced by : - the shape and the volume of the room, - the absorption of the surfaces, - the fittings. 1 STD-BSI
40、BS EN IS0 lLb70-3-ENGL 1777 = lb24bb7 07557b7 4TT EN IS0 11690-3:1998 The resulting sound level distribution can be considered using a spatial sound distribution curve (see definition 3.4.11 of part 1 and figures 1 and 2 of this Technical Report). The information contained in this curve can be summa
41、rized, for a given distance range, by two quantities (see definitions 3.4.12 and 3.4.13 of part 1) : - the rate of spatial decay of sound pressure level per distance doubling (DWI - the excess of sound pressure level with respect to a free field (DU). The spatial sound distribution curve and these t
42、wo quantities are used to describe the acoustical characteristics of a room. The sound pressure level caused by a given source is indeed smaller if DU is low and DL2 is high (see 6.3 of part 2). Annex D shows how the acoustical characteristics of a room can be described from spatial sound distributi
43、on curves. The spatial sound distribution curve is determined on a free path with no obstacle between the source and the receiver. For its measurement, see 8.4 of part 2. NOTES 1 rooms is in preparation (IS0 14257 presently at the stage of draft). An international Standard specific to the measuremen
44、t of spatial sound distribution curves in 2 When sound sources (machines) with dimensions too large to be neglected are considered, the sound distribution curve may differ from that of a point source for distances less than the typical dimension of the machine. 4.2 Rooms with diffuse sound fields If
45、 diffuse sound field conditions are met (see definitions 3.4.8 and 3.4.9 of part l), at a certain distance from the source, sound pressure levels are nearly constant and independent of receiver position, as shown in figure 1. 2 EN IS0 11690-3:1998 1 2 3 GS 10 m 50 100 W c-l distance - hall 15 m x 15
46、 rn x 5 m hall 30 m x 30 m x 12 m -.- free field Figure 1 : Examples of spatial sound distribution curves for an omnidirectional point source and two rooms with different sizes, equal absorption coefficients and diffuse field. The dotted curve is the spatial sound distribution curve under total free
47、 field conditions. 4, denotes the sound pressure level at a given point when the sound power level of the source is 100 dB. The sound pressure level of the diffuse field depends only on the total sound power level of all sources in the room and on the equivalent absorption area A. In rooms with a di
48、ffuse sound field, there is a direct connection between the reverberation time and the expected spatial sound distribution curve. It is therefore also possible to qualify such rooms by their reverberation time. In this case, noise prediction is relatively simple. 3 STD-BSI BS EN IS0 11bSO-3-ENGL 195
49、9 I lb24bb7 0755771 058 H EN IS0 11690-3:1998 4.3 Rooms with uniform sound propagation In many workrooms, diffuse sound field conditions cannot be assumed e.g. because the height of the room is less than one third of the length (flat rooms). In such rooms, even far from the source, the sound field depends on the position being considered and is characterized by a spatial sound distribution curve. In many workrooms, it can be assumed that the absorption and the fitting density are similar in different parts of the room (this inc
