ISO/TS TECHNICAL SPECIFICATION 13471-1 First edition 2017-03 Acoustics Temperature influence on tyre/road noise measurement - Part 1: Correction for temperature when testing with the CPX method Acoustique - Effet de la température sur les essais de bruit pneu/ route Partie 1: Mode operatoire de correction sur les essais avec la méthodeCPX Reference number ISO/TS13471-1:2017(E) rso International Organization for Standardization @ IS0 2017 d without license from IHS IS0/TS 13471-1:2017(E) COPYRIGHT PROTECTED DOCUMENT IS02017,PublishedinSwitzerland 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org icensee-ZHEJIANG INST OF STANDARDIZARloISQ s.7 - All rights reserved etworking permitted without license from IHS IS0/TS 13471-1:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions 3.1 Acoustics... .1 3.2 Tyres and road surfaces ..2 3.3 Temperatures 2 4 Principles of the correction procedures. ..3 5 Temperature measurement equipment .4 6 Measurement methods .4 6.1 General. .4 6.2 Measurement of air temperature .5 6.3 Measurement of road surface temperature (optional) .5 6.4 Measurement of tyre temperature (optional) .5 Temperature range .5 7.1 General .5 7.2 Temperature range within which the correction procedure is valid 5 Temperature correction procedure 8 8.1 Correction to CPX levels, LcPX 8.2 Temperature coefficient. ..6 8.3 Spectral correction . .7 9 Measurement uncertainty assessment according to Iso/IEc Guide 98-3 9.1 General. 7 9.2 Potential uncertainties .7 9.3 Uncertainty estimation of temperature correction 7 9.4 Sources of uncertainty ..8 9.4.1 Temperature coefficients, Yt 9.4.2 Road surface category, 8 .8 9.4.3 Temperature measurements, T 9.5 Estimation of uncertainties. ..8 10 Test report .9 Annex A (informative) Discrete temperature coefficient ..10 Annex B (informative) Information about road surface types ..11 Annex C (informative) Selection of temperature for normalization ..13 Bibliography. .14 iii ZHEJIANG INST OF STANDARDIZATION C1 5956617 withoutlicense from IHS