ISO 15619-2013 Reciprocating internal combustion engines - Measurement method for exhaust silencers - Sound power level of exhaust noise and insertion loss usin.pdf
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1、 ISO 2013 Reciprocating internal combustion engines Measurement method for exhaust silencers Sound power level of exhaust noise and insertion loss using sound pressure and power loss ratio Moteurs alternatifs combustion interne Mthode de mesure pour silencieux dchappement Niveau de puissance acousti
2、que du bruit lchappement et perte par insertion partir de la pression acoustique et du rapport de perte de puissance INTERNATIONAL STANDARD ISO 15619 First edition 2013-10-01 Reference number ISO 15619:2013(E) ISO 15619:2013(E)ii ISO 2013 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2013 All
3、 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 fr
4、om either ISO at the address below or ISOs 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 copyrightiso.org Web www.iso.org Published in Switzerland ISO 15619:2013(E) ISO 2013 All rights reserved
5、iii Contents Page Foreword iv Introduction v 1 Scope . 1 1.1 Measurement uncertainty . 1 2 Normative references 2 3 T erms and definitions . 2 4 Test environment . 6 4.1 General . 6 4.2 Criteria for background noise 7 4.3 Criterion for acoustic adequacy of test environment 9 5 Instrumentation .10 5.
6、1 General 10 5.2 Calibration .10 6 Installation and operation of noise source under test for laboratory measurement10 6.1 General 10 6.2 Source location .11 6.3 Installation requirements .11 6.4 Operation condition .13 7 Measurement 13 7.1 General 13 7.2 Laboratory measurement .14 7.3 Site measureme
7、nt 17 8 Calculation .20 8.1 General 20 8.2 Calculation of sound power level of exhaust noise .20 8.3 Calculation of insertion loss .22 8.4 Calculation of power loss ratio .23 9 Information to be recorded 23 9.1 General 23 9.2 Description of the tested exhaust silencer and substitution pipe .23 9.3 D
8、escription of the engine on which the exhaust silencer is installed .23 9.4 Acoustic environment 23 9.5 Description of instrumentation .23 9.6 Acoustical data .23 10 Test report 24 Annex A (normative) Qualification pr oc edur es for the ac oustic en vir onment .25 Annex B (informative) Measurement p
9、rocedure for pressure loss30 Annex C (normative) Calculation of A-weighted sound power levels from frequency band levels 31 Annex D (normative) Sound power level under reference meteorological conditions 33 Bibliography .35 ISO 15619:2013(E) Foreword ISO (the International Organization for Standardi
10、zation) 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 b
11、e represented on that committee. International 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 procedures used
12、to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of
13、the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified
14、during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on th
15、e meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/
16、TC 70, Internal combustion engines.iv ISO 2013 All rights reserved ISO 15619:2013(E) Introduction This International Standard specifies methods for measuring the sound power level of exhaust noise and the insertion loss of exhaust silencers installed on reciprocating internal combustion engines and
17、a method for measuring the power loss ratio of reciprocating internal combustion engines. Sound power level of exhaust noise, insertion loss, and transmission loss are parameters to characterize the acoustic performance of exhaust silencers. Sound power levels of exhaust noise and insertion loss are
18、 important parameters to characterize the acoustic matching performance of exhaust silencers and reciprocating internal combustion engines. Transmission loss is the difference in sound power level of exhaust noise between the noise before and after transmitting through the exhaust silencer, which is
19、 the parameter to characterize the acoustic performance of the exhaust silencer itself and is irrelevant with the reciprocating internal combustion engine. Power loss ratio and pressure loss are parameters to characterize the aerodynamic performance of exhaust silencers. Power loss ratio is an impor
20、tant parameter to characterize the aerodynamic matching performance of exhaust silencers and reciprocating internal combustion engines, whereas resistance coefficient which is closely related to pressure loss is to characterize the aerodynamic performance of the exhaust silencer itself and is irrele
21、vant with the reciprocating internal combustion engine on which the exhaust silencer is installed. The matching parameters of the sound power level of exhaust noise, the insertion loss, and the power loss ratio are used in this International Standard as the measurement parameters. For sound power le
22、vel of exhaust noise, the measurement results at 90 direction and 45 direction can be different. The measurement results at 45 direction is slightly greater than the actual value, the measurement results at 90 direction is much closer to the actual results. For insertion loss, the measurement result
23、s at 90 direction and 45 direction may be different, but the measurement uncertainty at 90 direction is smaller than that at 45 direction. Measurement at 90 direction is used for the laboratory measurement (engineering method). The measurement at 90 or 45 direction is used for laboratory measurement
24、 (survey method). The measurement at 45 direction is used for site measurement. ISO 2013 All rights reserved v Reciprocating internal combustion engines Measurement method for exhaust silencers Sound power level of exhaust noise and insertion loss using sound pressure and power loss ratio 1 Scope Th
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