ISO INTERNATIONAL STANDARD 13472-2 First edition 2010-05-15 Acoustics Measurement of sound absorption properties of road surfaces in situ: Part 2: Spot method for reflective surfaces Acoustique - Mesurage in situ des proprietés d'absorption acoustique des revetements de chaussées Partie 2: Méthode ponctuelle pour les surfaces réflechissantes Reference number ISO 13472-2:2010(E) @ ISO 2010 HS under ted without license from IHS Not for Resale ISO 13472-2:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below COPYRIGHTPROTECTEDDOCUMENT @ISO2010 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, 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 copyright@iso.org Web www.iso.org Published in Switzerland @ Iso 2010 - All rights reserved I without license from IHS Not for Resale ISO 13472-2:2010(E) Contents Page Foreword Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Principle.. 5 Test equipment .... 5.1 Components of the test system.. 5.2 Sound source..... 5.3 Test signal.... 5.4 Impedancetube 5.4.1 Tube diameter.. 5.4.2 Tube length and microphone positions 5.5 Microphones. 5.6 In-situ test fixture between impedance tube and test surface... 5.7 Signal-processing system.... 5.8 Thermometerandpressuremeasurement.. 6 Measurement and analysis procedure .. 6.1 Stabilizing the system.. 6.2 Calibration of the system.. 6.3 Reference measurement.. 6.4 Background noise measurement. 6.5 Measurement of a road surface ... 6.6 Data analysis... 7 Positioning of the equipment... 7.1 Location of the measurement positions ...... 8 7.1.1 Test surfaces such as those meeting Iso 10844 requirements . 7.1.2 Regular roads .... 7.2 Condition of the road surface . 7.3 8 Measurement and analysis procedure . 9 Measurement uncertainty ... 10 Test report. 11 Annex A (normative) Correction on base of reference measurement .. 12 Annex B (informative) Measurement uncertainty 13 B.1 General 13 B.2 Expression for the calculation of the absorption coefficient .. 13 B.3 14 B.4 Expanded uncertainty of measurement. 15 Annex C (informative) Sketch of in-situ test fixture ... AnnexD(informative)Exampleofatestreport Bibliography Copyrght International OrganizaionStadardizaonghtsreserved ii Not for Resale