SAE-J47-2005.pdf
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1、 SURFACE VEHICLE RECOMMENDED PRACTICE Maximum Sound Level Potential for Motorcycles 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 s
2、uitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. C
3、opyright 2005 SAE International All rights reserved. No part of this publication 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 DOCUMEN
4、T ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org Issued 1975-05 Revised 2005-03 Superseding J47 JUL1998 J47 REV. MAR2005 1. Scope This SAE Recommended Practice establishes the test procedure,
5、 environment, and instrumentation for determining the maximum sound level potential for motorcycles under wide open throttle acceleration and closed throttle deceleration. 1.1 Rationale Changes were made to References, Sections 4.1, 4.2, 5.1, 6.2, 6.2.1, 7.6, and 8.7. Section 9 was added. 2. Referen
6、ces 2.1 Applicable Publications 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. 2.1.1 SAE PUBLICATIONS Available from the Society of Automotive Engineers, Inc., 400 Commonwealth
7、 Drive,Warrendale, PA 15096-0001. SAE J184Qualifying a Sound Data Acquisition System SAE J213Definitions, Motorcycles SAE J331Sound Levels for Motorcycles SAE J1349Engine Power Test CodeSpark Ignition and Diesel 2.1.2 ANSI PUBLICATION Available from the American National Standards Institute, 25 West
8、 43rd Street, New York, NY 10036- 8002. ANSI S1.4Sound Level Meters, Specifications for Copyright SAE International Provided by IHS under license with SAELicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 11/06/2007 19:59:20 MSTNo reproduction or networking permitted without licens
9、e from IHS -,-,- SAE J47 Revised MAR2005 - 2 - 3. Definitions 3.1 Rated Engine Speed The speed in revolutions per minute at which the engine delivers maximum net brake power output as defined in SAE J1349, as determined by the manufacturer. 3.2 Manual Clutch A clutch which must be disengaged by the
10、operator to prevent engine stalling when the vehicles forward motion is stopped. 3.3 Longitudinal Plane of Symmetry As defined in SAE J213. 4. Instrumentation The following instrumentation shall be used where applicable. 4.1 A sound level meter which meets the Type 1 or Type S1A requirements of ANSI
11、 S1.4. At intervals of not more than 2 years, the sound level meter shall be calibrated for compliance with the Type 1 or Type S1A requirements of ANSI S1.4. As an alternative to making direct measurements using a sound level meter, a sound data acquisition system may be used, provided that the syst
12、em meets the requirements of SAE J184. 4.2 An acoustic calibrator with accuracy of 0.5 dB. (See 8.6.4.) At intervals of not more than 2 years, the acoustic calibrator shall be calibrated to its original specifications. 4.3 An engine speed tachometer, or other means of determining engine speed, with
13、steady-state accuracy of 3% at 60% and 100% of rated engine speed. 4.4 A speedometer with steady-state accuracy of 3% at a vehicle speed of 100 km/h, or the vehicle maximum speed, whichever is less. 4.5 An anemometer with steady-state accuracy of 10% at a wind speed of 5.0 m/s. 4.6 An acceptable win
14、d screen may be used with the microphone. To be acceptable, the screen shall not affect the microphone response more than 1 dB for frequencies of 4000 to 10 000 Hz, taking into account the orientation of the microphone. Copyright SAE International Provided by IHS under license with SAELicensee=IHS E
15、mployees/1111111001, User=Wing, Bernie Not for Resale, 11/06/2007 19:59:20 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE J47 Revised MAR2005 - 3 - 5. Test Site 5.1 The test site (Figure 1) shall be a substantially level open space accommodating a straight vehicle path
16、 and the following points: 5.1.1 ON THE VEHICLE PATH AMicrophone target point BEnd pointa point 7.5 m beyond the microphone target point CAcceleration pointa point at least 7.5 m before to the microphone target point established by the method described in 6.2 and 6.3. DA point 15 m before the microp
17、hone target point EA point 15 m beyond the microphone target point 5.1.2 OFF THE VEHICLE PATH FMicrophone pointa point 15 m from the centerline of the vehicle path on the perpendicular line which passes through the microphone target point. 5.2 The measurement area within the test site shall be a tri
18、angular area defined by the microphone point (F) and the points D and E. The surface of the ground within at least this area shall be portland cement or bituminous asphalt concrete, dry and free from snow, soil, or other extraneous material. 5.3 The test site shall be free of large sound-reflecting
19、surfaces (other than the ground) such as parked vehicles, signboards, buildings, or hillsides, located within 30 m of the measurement area. 5.4 The vehicle path shall be relatively smooth portland cement or bituminous asphalt concrete, dry and free of extraneous material such as gravel, snow, or ice
20、 and of sufficient length for acceleration, deceleration, and stopping of the vehicle. 5.5 The microphone of the sound measurement system shall be located above the microphone point. The microphone shall be positioned 1.2 m 0.02 m above the ground plane. The microphones reference axis shall be perpe
21、ndicular to the vehicle path. (See 8.6.1.) 5.6 The test site layout in Figure 1, for the purposes of clarity, illustrates an approach from left to right. Sound level measurements are to be made on both sides of the vehicle; therefore, it will be necessary to establish either a second microphone poin
22、t on the opposite side of the vehicle path with a corresponding measurement and clear area, or use approaches from both directions with corresponding acceleration points and end points. Copyright SAE International Provided by IHS under license with SAELicensee=IHS Employees/1111111001, User=Wing, Be
23、rnie Not for Resale, 11/06/2007 19:59:20 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE J47 Revised MAR2005 - 4 - FIGURE 1TEST SITE 6. Procedure 6.1 Overview The intention of this test is to have the vehicle under test reach the end point under its maximum noise condit
24、ionsat wide open throttle and at rated engine speed, or as close to rated engine speed as the powertrain and conditions permit. Vehicles with a manual clutch approach the acceleration point at a steady engine speed. All other vehicles begin accelerating from the acceleration point using a standing s
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