ISO INTERNATIONAL STANDARD 9611 First edition 1996-08-01 Acoustics - Characterization of sources of structure-borne sound with respect to sound radiation from connected structures - Measurement of velocity at the contact points of machinery when resiliently mounted Acoustique -- Caracterisation des sources de bruit solidien pour estimer le bruit rayonne parles structures auxquelles elles sont fixées Mesurage de la vitesse aux points de contact des machines a montage élastique ISO Reference number ISO 9611:1996(E) Copyright Intermational Organization for Standardization Not for Resale ISO 9611:1996(E) Foreword ISO (the International Organization for Standardization) is a worldwide fed- eration 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 resented on that committee. Internationat organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. iSO col- laborates ctoselywiththe International Electrotechnical Commission(lEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are cir- a vote. International StandardISO9611 was prepared byTechnical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. Annexes A to D form an integral part of this International Standard. An- nexes E to J are for information only. ISO 1996 All rights reserved. Unless otherwise specified, no part of this publication may be repro- duced or utilized in any form or by any means, electronic or mechanical, inciuding photo copying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56·CH-1211Geneve 20·Switzerland Printed in Switzerland ii ovided by IHS under licens tworking permited without license from IHS Not for Resale ISO 9611:1996(E) @ ISO Introduction This International Standard is one of a series of frame documents specify- ing various methods for the characterization of machines or equipment as sources of structure-borne sound with respect to sound radiation from connected structures. The application of this International Standard to a certain family of ma- chines needs additional requirements such as, for example, well-defined operating conditions given in a specific test code. This International Stan- dard describes how, at each connection point for a resilient element, six dard deviations for their measurement uncertainty for frequencies in a given range of frequency. For a specific machine, a family of machines or for a specific application, fewer components may be sufficient to charac terize the source, thus the number of components measured could be re- reduced. 0.1 General considerations Airborne sound in buildings, ships and vehicles and the underwater sound radiated by ships is very often caused by vibrations of machinery or equipment. In general, such sound is emitted in at least two ways a) directly from the outer surface of the machine into surrounding air; ISO3740toISO3747and inISO/TR7849; and b) from structures connected to the machine; this sound radiation re- sults from structure-borne sound being emitted by the machine into the connected structures such as foundation, pipes, other coupled machines or linked auxiliary equipment. This International Standard deals according to b) with machines or equip- mentwhichare sourcesof structure-borne sound emission into connected structures with respect to airborne or liquid-borne sound radiation of con- nectedstructures. The measurement and evaluation of machinery vibration with respect to human response, trouble-free operation of coupled or connected ma- chinery, as well as structural fatigue and the lifetime of the machine itself are outside the scope of this International Standard. These fields are cov- Mechanical vibration and shock (see, for example, ISO 10816-1). A