ISO TR 11690-3-1997 Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part 3 Sound propagation and noise prediction.pdf
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1、TECHNICAL REPORT lSO/TR 11690-3 First edition 1997-02- 15 Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part 3: Sound propagation and noise prediction in workrooms Acoustique - Pratique recommand4e pour la conception de locaux de travail B bruit rkdui
2、t contenant des machines - Partie 3: Propagation du son et pr a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii 0 IS0 ISOmR 11690-3: 1997(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The w
3、ork of preparing International Standards is normally carried out through IS0 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- gover
4、nmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The main task of technical committees is to prepare International Standards, but in exceptional circumstance
5、s a technical committee may propose the publication of a Technical Report of one of the following types: - 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
6、or where for any other reason there is the future but not immediate possibility of an agreement on an International 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 exampl
7、e). Technical Reports of types 1 and 2 are subject to review within three years of publication, to decice 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 Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide are considered to be no longer valid
8、or useful. lSO/TR 11690-3, which is a Technical Report of type 3, was prepared by Technical Committee lSO/TC 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
9、machinery - Part 1: Noise control strategies - Part 2: Noise control measures - Part 3: Sound propagation and noise prediction in workrooms . . . III lSO/TR 11690-3: 1997(E) Introduction This Technical Report is intended for use by all parties involved in noise reduction in workplaces and design of
10、low-noise workplaces. The objective is: - to make them aware 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 contro
11、l requirements. This Technical Report provides the connection 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 fo
12、r noise emission values, and machine users, who require low 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
13、 workrooms is presented and a structure is given for the classification of prediction methods according to the level of detail of input parameters. TECHNICAL REPORT o IS0 ISO/TR 11690-3:1997(E) Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part 3 : So
14、und propagation and noise prediction in workrooms 1 Scope In this part of IS0 11690, 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 predi
15、ction scheme are strongly dependent on the situation being considered and the way 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 predict
16、ion as an aid for noise control in workrooms. Examples of use of noise prediction methods are given in annexes A to E. 2 References References listed in IS0 11690-l should also be consulted when using this Technical Report. 3 Definitions Definitions given in IS0 11690-l apply to this Technical Repor
17、t. 4 Basic principles of sound propagation in rooms 4.1 Sound propagation descriptors 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 v
18、olume of the room, - the absorption of the surfaces, - the fittings. 1 ISOmR 11690-3:1997(E) IS0 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
19、 in this curve can be summarized, 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 (DW - the excess of sound pressure level with respect to a free field (DLf). The spatial sound dis
20、tribution curve and these two quantities are used to describe the acoustical characteristics of a room. The sound pressure level caused by a given source is indeed smaller if DLf 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 f
21、rom spatial sound distribution 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 An International Standard specific to the measurement of spatial sound distribution curves in
22、 rooms is in preparation (IS0 14257 presently at the stage of draft). 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
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