ISO/TR TECHNICAL REPORT 17534-3 First edition 2015-01-15 Acoustics Software for the calculation of sound outdoors Part 3: Recommendations for quality assured implementation of Is0 9613-2 in software according to Is0 17534-1 Acoustique - Logiciels de prévision de bruit dans I'environnement - PartieParte 3: Recommandations pour I'assurance qualité mise en oeuvre de la norme IS0 9613-2 dans le logiciel selon IS0 17534-1 Reference number IS0/TR17534-3:2015(E) LSO International Orgainization for Standardization @ IS0 2015 Zhejiang Institute of Standardization 5956617 IS0/TR 17534-3:2015(E) COPYRIGHTPROTECTEDDOCUMENT @IS02015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland Not for Resale, 2015/6/2 06:08:21 networking permited without license from IHS IS0/TR 17534-3:2015(E) Contents Page Foreword ..V Introduction ..vi 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions ..1 4 Identification of the official documentation ..1 5 Additional recommendations ..1 5.1 General. 1 5.2 Screening. .2 5.3 Limitation of the maximal possible attenuation by barriers .4 5.4 Calculation of the path-length difference, z. 5.5 Diffraction with barrier on reflecting ground .4 5.6 No level increase caused by barriers due to lateral diffraction .4 5.7 No ground effect calculated with rays laterally diffracted 5 5.8 No lateral diffraction with elevated ground screening the direct ray .5 5.9 Multi-reflection . the extension to reflections of higher orders .5 6 Test cases. .6 6.1 General .6 6.2 Test cases with step by step results and final result interval. .6 6.2.1 T01-T03 Flat ground with homogeneous acoustic properties 6 6.2.2 T01 Reflecting ground (G = 0) ..7 6.2.3 T02 Mixed ground (G = 0,5) .8 6.2.4 Porous ground (G = 1) 9 6.2.5 Flat ground with spatially varying acoustic properties. 9 6.2.6 T05 Identical to To4, but calculation with the alternative method according to ISO 9613-2:1996, 7.3.2. .11 6.2.7 T06 Ground with spatially varying heights and acoustic properties. 12 6.2.8 T07 Identical to To6, but calculation with the alternative method according to IS0 9613-2:1996, 7.3.2 .15 6.2.9 T08.. Flat ground with spatially varying acoustic properties and long barrier .16 6.2.10 T09 Flat ground with spatially varying acoustic properties and short barrier 19 6.2.11 T10 Ground with spatially varying heights and acoustic properties and shortbarrier .22 6.2.12 T11 Flat ground with homogeneous acoustic properties and cubic building receiver at low height. 24 6.2.13 T12 Flat ground with homogeneous acoustic properties and cubic building receiver at large height. 28 6.2.14 ii censee=Zhejiang Institute of Standardization 5956617 vithout license from IHS Not for Resale, 2015/6/2 06:08:21