TECHNICAL ISO/TR REPORT 11690-3 Firstedition 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 recommandée pour la conception de locaux de travail a bruit réduit contenant des machines - Partie 3: Propagation du son et prevision du bruit dans les locaux de travail This material is reproduced from ISo documents under Internationat Organization for Standardization (Iso) Copyright License number IHS/lcc/1996.Notforresale.NopartoftheseISOdocumentsmaybe reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright lawof the countryof use,or withthepriorwritten consent of iso (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 7341079),IHS ortheISOLicensor'smembers. ISO Reference number ISO/TR 11690-3:1997(E) Copyright Intermational Organization for Standardization No reproduction or networking permited without license from IHS Not for Resale ISO/TR 11690-3:1997(E) Contents Page Scope 2 Definitions 3 References. 4 Basic principles of sound propagation in rooms . 5 Noiseprediction in workrooms 6 Methodology for noise prediction in workrooms .. 5 7 Further aspects of noise prediction . 14 Annexes A Three case studies relating to noise prediction in workrooms. 15 B 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 acoustical quality of a workroom... E Recommendation for the use of noise prediction methods .34 F Bibliography . 35 ISO1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Casepostale56.CH-1211Geneve20·Switzeriand Internet [email protected] X.400 C=ch; a=400net; p=iso; O=isocs; s=central Printed in Switzerland i @ISO ISO/TR 11690-3:1997(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing 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. Internationai organizations, governmental and non- governmental, 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. 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 types: International Standard, despite repeated efforts; type 2, when the subject is still under technical development or where for any other 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 example). 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 or useful. ISO/TR 11690-3, which is a Technical Report of type 3, was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. Iso 11690 consists of the following parts, under the general title Acoustics Recommended practice for the design of low-noise workplaces containing machinery. Part 1:Noise control strategies Part2:Noisecontrolmeasures Part 3: So