SAE J 2717-2012 Tests to Define Tire Size (Geometry) Mass and Inertias《评定轮胎尺寸(几何)、质量和动量试验》.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 theref
2、rom, 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 2012 SAE International All rights reserved. No part of this pub
3、lication 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: +1 724-776-4970
4、(outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2717_201206SURFACEVEHICLERECOMMENDEDPRACTICEJ2717 JUN2012 Issued 2006-04Revised 201
5、2-06Superseding J2717 APR2006 Tests to Define Tire Size (Geometry), Mass, and Inertias RATIONALEThis Recommended Practice was developed as part of a set of Recommended Practices intended to allow modelers to determine the parameters required by any of the common tire models for calculating spindle l
6、oads given the road surface profile from a single set of experimental results, and thus, to eliminate duplicate testing. This version addresses minor editorial problems found in previous versions. 1. SCOPE This SAE Recommended Practice describes a trio of test methods which determine basic tire size
7、 (geometry), mass, and moments of inertia. The methods apply to any tire so long as the equipment is properly scaled to conduct the measurements for the intended test tire. The data are suitable for determining parameters for road load models and for comparative evaluations of the measured propertie
8、s in research and development.NOTE: Herein, road load models are models for predicting forces applied to the vehicle spindles during operation over irregular surfaces paved or unpaved. Within the context of this Recommended Practice, forces applied to the surface on which the tire is operating are n
9、ot considered. 1.1 Procedures Three procedures are specified. The first procedure determines the tires undeflected radius, section width, and section height. The second determines the mass of the tire and of the wheel on which the tire is mounted. The third procedure determines moments of inertia ab
10、out the three Cartesian axes defined in Recommended Practice SAE J2710.1.2 Test Machines No specific purpose built test machines are required to use the procedures in this Recommended Practice although individual test laboratories may have specific purpose built test machines for making certain meas
11、urements, for example, inertias. Each procedure can be applied using an ensemble of jigs and tools specific to itself. Example tools and jigs adequate for each procedure are specified within the Required Measurement Tools section of the description of each specific procedure. SAE J2717 Revised JUN20
12、12 Page 2 of 20 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. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth
13、Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J2047 Tire Performance Technology SAE J2429 Free-Rolling Cornering Test for Truck and Bus Tires SAE J2710 Modal Testing and Identification of Lower Order Tire Natural Frequencie
14、s of Radial Tires SAE 770870 The Effect of Tire Break-in on Force and Moment Properties, K. D. Marshall, R. L. Phelps, M. G. Pottinger, and W. Pelz, 1977 SAE 810066 The Effect of Aging on Force and Moment Properties of Radial Tires, M. G. Pottinger, K. D. Marshall, 1981.2.1.2 OSHA Publication Availa
15、ble from Rubber Manufacturers Association, 1400 K Street, NW, Suite 900, Washington, DC 20005, Tel: 202-682-4800, www.rma.org.OSHA Standard 1910.177 Servicing Multi-piece and Single Piece Rim Wheels - Available in wall chart form as #TTMP-7/952.1.3 ISO Publication Available from American National St
16、andards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org.ISO/IEC 17025:2005 General requirements for the competence of testing and calibration laboratories 2.1.4 ASTM Publication Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Con
17、shohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.orgASTM F1502-05(2010) Standard Test Method for Static Measurements on Tires for Passenger Cars, Light Trucks, and Medium Duty Vehicles 2.1.5 FMVSS Publication Available from U.S. Department of Transportation, National Highway Traffic Safety Admi
18、nistration, Office of Communications and Consumer Information (NPO-502), 400 Seventh St., SW, Washington, DC 20590. FMVSS 139 New Pneumatic Radial Tires for Light Vehicles SAE J2717 Revised JUN2012 Page 3 of 20 3. DEFINITIONS The definitions that follow are of special meaning in this Recommended Pra
19、ctice and are either not contained in other Recommended Practices or are worded somewhat differently in this practice. 3.1 WHEEL A wheel is a rim together with the disc or spider that allows attachment of a rim to the vehicles hubs. A wheel cross-section schematic is shown in Figure 1. RimDiscSpindl
20、eFIGURE 1 - WHEEL CROSS-SECTION 3.2 MOMENTS OF INERTIA The moments of inertia are defined in the double primed axis system introduced in J2710. Figure 2 shows the J2710 axis system for the special case of no camber or inclination. That case applies in this Recommended Practice. The wheel is sketched
21、 in rear elevation. The view is forward along the X” - axis looking at the Y” - Z” plane. The systems origin is at the point that the spin axis intersects the wheel plane, which is the plane halfway between the rim flanges (J2047). The system is a right-handed, orthogonal, Cartesian system. The X” a
22、nd Z” axes lie in the wheel plane. The Y” - axis is to the right. If the tire is mounted with the tire face to the right, as if it were on the right side of a vehicle, Y” is outward. 3.2.1 Wheel Moments of Inertia 3.2.1.1 Wheel Moment of Inertia about the Y” - Axis This is the moment of inertia of t
23、he wheel alone about the Y” - Axis. 3.2.1.2 Wheel Moment of Inertia about the Z” - Axis This is the moment of inertia of the wheel alone about the Z” - Axis. The moment of inertia of the wheel about the X” - Axis is the same due to wheel symmetry.SAE J2717 Revised JUN2012 Page 4 of 20 Y”a aWheelPlan
24、eZ”SpindleWheelPlaneWheelPlaneWheelPlaneWheelPlaneWheelPlaneFIGURE 2 - REAR ELEVATION VIEW OF THE DOUBLE PRIMED AXIS SYSTEM 3.2.2 Tire Moments of Inertia 3.2.2.1 Tire Moment of Inertia about the Y” - Axis This is the moment of inertia of the tire alone about the Y” - Axis.3.2.2.2 Tire Moment of Iner
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