1、BRITISH STANDARD BS EN ISO 11690-2:1997 Acoustics Recommended practice for the design of low-noise workplaces containing machinery Part 2: Noise control measures The European Standard EN ISO11690-2:1996 has the status of a British Standard ICS 13.140; 17.140.20BSEN ISO 11690-2:1997 This British Stan
2、dard, having been prepared under the directionof the Health and Environment Sector Board, waspublished under the authorityof the Standards Boardand comes into effect on15May 1997 BSI 09-1999 ISBN 0 580 27285 0 National foreword This British Standard is the English language version of EN ISO11690-2:1
3、996. It is identical with ISO11690-2:1996. The UK participation in its preparation was entrusted by Technical Committee EH/1, Acoustics, to Subcommittee EH/1/4, Machinery noise, whichhas the responsibility to: aid enquirers to understand the text; present to the responsible international/European co
4、mmittee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross
5、-references Attention is drawn to the fact that Annex ZA lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the s
6、ection entitled “International Standards Correspondence Index”, or 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.
7、 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, theEN ISO title, page 2, the ISO title page, pages ii to iv, pages1 to20, aninside back cover andaback cover.
8、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 CommentsBSENISO11690-2:1997 BSI 09-1999 i Contents Page National foreword Inside fr
9、ont cover Foreword 2 Foreword iii Text of ISO 11690-2 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM ENISO11690-2 November1996 ICS 13.140 Descriptors: See ISO document English version Acoustics Recommended practice for the design of low-noise workplaces containing machinery Part 2: Noise
10、 control measures (ISO11690-2:1996) Acoustique Pratique recommande pour la conception de lieux de travail bruit rduit contenant des machines Partie 2: Moyens de rduction du bruit (ISO11690-2:1996) Akustik Richtlinien fr die Gestaltung lrmarmer maschinenbestckter Arbeitssttten Teil 2: Lrmminderungsma
11、nahmen (ISO11690-2:1996) This European Standard was approved by CEN on1996-10-16. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and
12、bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibilit
13、y 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 standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portug
14、al, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN ISO11690-2:1996 EENISO 11690-2:1996 B
15、SI 09-1999 2 Foreword The text of the International Standard ISO11690-2:1996 has been prepared by Technical Committee ISO/TC43 “Acoustics” in collaboration with Technical Committee CEN/TC211 “Acoustics”, the secretariat of which is held by DS. This European Standard shall be given the status of a na
16、tional standard, either by publication of an identical text or by endorsement, at the latest by month of May1997, and conflicting national standards shall be withdrawn at the latest by month of May1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the fo
17、llowing countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. Endorsement notice The text of the International Standar
18、d ISO11690-2:1996 was approved by CEN as a European Standard without any modification.ENISO 11690-2:1996 ii BSI 09-1999 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative reference 1 3 Definitions 1 4 Technical aspects of noise control 1 5 Noise control at source 2 6 Noise control on th
19、e transmission path 7 7 Noise control at the work station 8 8 Verification methods 8 9 New technologies 10 Annex A (informative) Modification or replacement of machine components 11 Annex B (informative) Arrangement of sound sources 11 Annex C (informative) Enclosures 12 Annex D (informative) Silenc
20、ers 14 Annex E (informative) Noise barriers and screens in rooms 14 Annex F (informative) Acoustical treatment of surfaces 14 Annex G (informative) Structure-borne sound insulation 15 Annex H (informative) Airborne sound insulation of partitions 16 Annex I (informative) Noise control at the work sta
21、tion 16 Annex J (informative) Example of a new technology 17 Annex K (informative) Bibliography 18 Annex ZA (normative) Normative references to international publications withtheir relevant European publications Inside back cover Figure 1 Basic aspects of noise control 2 Figure 2 Steps for the imple
22、mentation of noise control measures 3 Figure 3 Generation process of mechanical noise 3 Figure 4 Example of sound pressure level during hammering 5 Figure 5 Example of sound pressure level when grinding during the cleaningofa cast iron electromotor housing 6 Figure 6 Example of sound pressure level
23、when hammering 6 Figure 7 Example of sound pressure level when grinding a steel plate 7 Figure 8 Typical spatial sound distribution curve for a room with diffuse fieldconditions, without and with several surface treatments 9 Figure 9 Typical spatial sound distribution curve for a fitted room without
24、diffuse field conditions, with and without sound-absorbing ceiling 10 Figure C.1 Typical noise reduction achieved for different machine and enclosureconfigurations 13 Figure J.1 Cancellation mechanism 17 Figure J.2 Limit of application 17 Table 1 Examples of alternative processes with lower noise 5
25、Table 2 Typical values for the average sound absorption coefficient ( ) andsound propagation descriptors DL fand DL 2in the middle region 8 Table F.1 Mean sound absorption coefficient ( ) in the frequency range500Hzto2000Hz for nearly cubic rooms without sound-absorbingtreatment 15 Descriptors: Acou
26、stics, machinery, noise (sound), engine noise, noise reduction, workplaces, design, implementation.ENISO11690-2:1996 BSI 09-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Int
27、ernational 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 liaison w
28、ith 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. Publication as
29、an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO11690-2 was prepared by Technical Committee ISO/TC43, Acoustics, Subcommittee SC1, Noise. ISO11690 consists of the following parts, under the general title Acoustics Recommended
30、practice for the design of low-noise workplaces containing machinery: Part 1: Noise control strategies; Part 2: Noise control measures; Part 3: Sound propagation and noise prediction in workrooms. Part 1 is the central document in the series. Parts2 and3 give additional technical and explanatory inf
31、ormation. It is therefore recommended to start withpart1. Annex A to Annex K of this part of ISO11690 are for information only.iv blankENISO11690-2:1996 BSI 09-1999 1 Introduction Most of the existing International Standards prepared in ISO/TC43/SC1 specify methods for measurement and/or evaluation
32、of noise. The final objective of ISO11690, however, is noise reduction. A number of noise control measures are offered. However, in order to be effective, the most appropriate noise control measure(s) should be chosen for a given situation. It is important when non-acoustic engineers are involved in
33、 noise control practice for these engineers to have a basic knowledge of noise emission and propagation characteristics and to understand the basic principles of noise control. To assist in the development of noise control in the workplace, it is essential that the information contained in these rec
34、ommended practices is disseminated through International Standards. In order to reduce noise as a hazard in the workplace, individual countries have produced national legislation. Generally, such national legislation requires noise control measures to be carried out in order to achieve the lowest re
35、asonable levels of noise emission, noise immission and noise exposure, taking into account: known available measures; the state of the art regarding technical progress; the treatment of noise at source; appropriate planning, procurement and installation of machines and equipment. This part of ISO116
36、90, together with the two other parts in the series, outlines procedures to be considered when dealing with noise control at workplaces, within workrooms and in the open. These recommended practices give in relatively simple terms the basic information necessary for all parties involved in noise con
37、trol in workplaces and in the design of low-noise workplaces to promote the understanding of the desired noise control requirements. The purpose of the ISO11690 series is to bridge the gap between existing literature on noise control and the practical implementation of noise control measures. In pri
38、nciple, the series applies to all workplaces and its main function is: to provide simple, brief information on some aspects of noise control in workplaces; to act as a guide to help in the understanding of requirements in standards, directives, text books, manuals, reports and other specialized tech
39、nical documents; to provide assistance in decision making when assessing the various measures available. The ISO11690 series should be useful to persons such as plant personnel, health and safety officers, engineers, managers, staff in planning and purchasing departments, architects and suppliers of
40、 plants, machines and equipment. However, the above-mentioned parties should keep in mind that adherence to the recommendations of the ISO11690 series is not all that is necessary to create a safe workplace. The effects of noise on health, well-being and human activity are many. By giving guidelines
41、 for noise control strategies and measures, the ISO11690 series aims at a reduction of the impact of noise on human beings at workplaces. Assessment of the impact of noise on human beings is dealt with in other documents. 1 Scope This part of ISO11690 deals with the technical aspects of noise contro
42、l in workplaces. The various technical measures are stated, the related acoustical quantities described, the magnitude of noise reduction discussed and the verification methods outlined. This part of ISO11690 deals only with audible sound. NOTE 1Annex K lists relevant International Standards and oth
43、er literature on noise control measures. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO11690. At the time of publication, the edition indicated was valid. All standards are subject to revision, and par
44、ties to agreements based on this part of ISO11690 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO11690-1:1996, Acoustics Recommended practice
45、 for the design of low-noise workplaces containing machinery Part 1: Noise control strategies. 3 Definitions For the purposes of this part of ISO11690, the definitions given in ISO11690-1 apply. 4 Technical aspects of noise control Noise reduction measures can be applied at source (emission), betwee
46、n the source and the receiver (transmission path), and at the work station (receiver). (See Figure 1.)ENISO 11690-2:1996 2 BSI 09-1999 When dealing with the noise emission of a machine, an installation or a production process, etc., all possible noise reduction measures should be considered (see cla
47、use5 and ISO11690-1). To determine whether noise emission is as low as reasonably practicable, it is necessary to consider noise emission quantities; these are given in the noise emission declaration (see ISO11690-1:1996, clause8) or determined by measurements (carried out in compliance with the rel
48、evant standard). An assessment of noise control devices such as enclosures, partial enclosures, barriers and screens, silencers, etc. can be carried out by using, for example, the insertion loss data (see6.2). The acoustic quality of workrooms and buildings is assessed with reference to the sound in
49、sulation regarding airborne and structure-borne sound (see6.4), and that of workrooms with reference to sound propagation parameters (see6.3). The overall effectiveness of noise control measures is determined from the noise immission values at the work stations. Generally, people located at a work station or in the vicinity of a machine are affected by the direct noise emitted by the machine. Therefore, to reduce noise in the workplace, the most effective solution is to reduce noise
