SAE J 192-2013 Maximum Exterior Sound Level for Snowmobiles《履带式雪上汽车用外部最大声级》.pdf
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1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J192_201301 SURFACE VEHICLE RECOMMENDED PRACTICE J192 JAN2013 Issued 1970-09 Revi
5、sed 2013-01 Superseding J192 MAR2011 Maximum Exterior Sound Level for Snowmobiles RATIONALE The committee has agreed upon increasing tolerances on entry speed and full throttle position to reduce the amount of test runs needed to satisfy requirements. These increases in tolerance do not change the h
6、ighest sound measured for the test. FOREWORD This SAE Recommended Practice is intended as a guide toward standard practice, but may be subject to frequent change to keep pace with experience and technical advances. 1. SCOPE This SAE Recommended Practice establishes the instrumentation, test site, an
7、d test procedure for determining the maximum exterior sound level for snowmobiles. Sound propagation is directly related to the ground cover and provides the largest variation to the measured result. A correction factor is introduced to improve year round test repeatability of the results on grass s
8、urfaces by correcting their spectrum to be similar to snow covered spectra. Measured sound pressure levels are also highly dependent on the degree of track slip present when performing the vehicle acceleration. Operators should attempt to limit track slip as much as possible while maintaining the re
9、quirements described in 5.1.1. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. SAE J192 Revised JAN2013 Page 2 of 9 2.1.1 SAE Publication
10、Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J184 Qualifying a Sound Data Acquisition System 2.1.2 ANSI Publications Available from American National Standards Institute,
11、 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ANSI S1.4 Specification for Sound Level Meters ANSI S1.11 Specification for 1/3 Octave Bands 2.1.3 ISO Publication Available from International Organization for Standardization (ISO), 1 rue de Varembe, Case Postale 56, C
12、H-1211 Geneva 20, Switzerland, Tel: +41-22-749-01-11, www.iso.org. ISO 3741 AcousticsDetermination of sound power levels and sound energy levels of noise sources using sound pressurePrecision methods for reverberation test rooms 2.1.4 JASA Publication Available from The Journal of the Acoustical Soc
13、iety of America (JASA), American Institute of Physics, Suite 1NO1, 2 Huntington Quadrangle, Melville, NY 11747-4502, Tel: 516-576-2360, http:/asa.aip.org. Cramer, O., The Variation of the Specific Heat Ratio and the Speed of Sound in Air with Temperature, Pressure, Humidity and CO2Concentration, Jou
14、rnal of the Acoustical Society of America, 93 (5), 1993 2.1.5 Metrologia Publication Available from The Institute of Physics (IOP), Institute of Physics Publishing, Dirac House, Temple Back, Bristol BS1 6BE, United Kingdom, Tel: +44-0-117-929-7481, http:/publishing.iop.org. Giacomo, P., Equation for
15、 the Determination of the Density of Moist Air, Metrologia, Springer-Verlag, 1982 2.2 Related Publications The following publications are provided for information purposes only and are not a required part of this SAE Technical Report. 2.2.1 ANSI Publications Available from American National Standard
16、s Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ANSI S1.1 Acoustical Terminology ANSI S1.13 Methods of Measurements of Sound Pressure Levels SAE J192 Revised JAN2013 Page 3 of 9 3. INSTRUMENTATION The following instrumentation shall be used for the measure
17、ments required. 3.1 A sound level meter which meets the Type 1 requirements of ANSI S1.4. 3.1.1 As an alternative to making direct measurements using a sound level meter, a microphone or sound level meter may be used with an audio recorder and/or a graphic level recorder or other indicating instrume
18、nt provided the system meets the requirements of SAE J184. 3.1.2 The microphone shall be used with an acceptable windscreen. To be acceptable, the screen must not affect the microphone response by more than 1 dB for frequencies of 20 to 4000 Hz or 1 1/2 dB for frequencies of 4000 to 10 000 Hz. 3.1.3
19、 For summer testing, the sound level meter or audio recorder must be capable of calculating 1/3 octave bands from 20 to 10 000 Hz following the Type 1 requirements of ANSI S1.11. 3.2 A sound level calibrator with an accuracy of 0.2 dB. 3.3 An engine speed sensor or other means of continuously record
20、ing engine speed during the event with a steady-state accuracy of 3% at the prescribed test speed. 3.4 A sensor capable of recording when the full throttle position is achieved. 3.5 A sensor to indicate the vehicle position at the start, full throttle location, and end of the course. 3.6 A sensor to
21、 determine the vehicle velocity during the event. 3.7 Thermometer. 3.8 Barometer. 3.9 Sling psychrometer, or dew point apparatus. 3.10 Windvane. 3.11 Anemometer. 3.12 Grass Surface Testing Only Sound pressure source capable of generating a minimum sound power level of 60 dBA or higher from 100 to 20
22、0 Hz and a minimum sound power level of 90 dBA or higher from 250 to 1000 Hz. 4. TEST SITE 4.1 A suitable test site shall be a level, open space free from the effects of large sound reflecting surfaces. Parked vehicles, signboards, or other obstacles must not be located within 30 m (100 ft) of eithe
23、r the vehicle path or the microphone. (See Figure 1.) SAE J192 Revised JAN2013 Page 4 of 9 FIGURE 1 - UNIDIRECTIONAL TEST SITE LAYOUT 4.2 The microphone shall be located 15 m (50 ft) from the centerline of the snowmobile path and 1.2 m (4 ft) above the snow or turf. The normal to the vehicle path fr
24、om the microphone shall establish the microphone point on the snowmobile path. 4.3 The measurement area shall be the triangular area formed by the start point, the end point, and the microphone location. 4.4 Test site validation must be accomplished before any snowmobile sound measurements can be pe
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