SAE J 2675-2017 Combined Cornering and Braking Test for Truck and Bus Tires.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 ther
2、efrom, 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 2017 SAE International All rights reserved. No part of this
3、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 DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49
4、70 (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:/standards.sae.org/J2675_201711 SURFACE VEHICLE RECOMMENDED PRACTICE J2675 NOV2017 Issued 2004-04 Revised 2017-11
5、 Superseding J2675 OCT2010 Combined Cornering and Braking Test for Truck and Bus Tires RATIONALE The purpose of this revision is to correct minor errors in the existing document and to bring the document up to date in light of developments between 2010 and 2017. The original document referenced an o
6、ver-the-road test machine that has since been decommissioned and is no longer available. The document has also been updated to include a new class of hybrid testing machines which test a tire while moving it over a paved surface in a controlled environment. 1. SCOPE This SAE Recommended Practice des
7、cribes a test method for determination of heavy truck (Class VI, VII, and VIII) tire force and moment properties under combined cornering and braking conditions. The properties are acquired as functions of slip angle, normal force, and slip ratio. Slip angle and normal force are changed incrementall
8、y using a sequence specified in this document. At each increment, the slip ratio is continually changed by application of a braking torque ramp. The data are suitable for use in vehicle dynamics modeling, comparative evaluations for research and development purposes, and manufacturing quality contro
9、l. This document is intended to be a general guideline for testing on an ideal machine, and modifications to the protocols recommended within are expected depending on the requirements of each customer. Due care is necessary when modifying protocols to ensure that the integrity of the data is mainta
10、ined. 1.1 Truck Tires For the purposes of this document, truck tires are defined as being the tires mounted on all heavy commercial over-the-road trucks (Class VI, VII, and VIII) and buses. Examples of vehicles which use heavy truck tires include tractor/semi-trailer combinations, dump trucks, and s
11、chool buses. Tires mounted on classes of commercial vehicles other than Classes VI, VII, or VIII, and other types of lighter GVWR vehicles, are explicitly excluded from consideration in this document. 1.2 Effects Not Considered The effects of non-zero inclination angle or any combination of non-zero
12、 inclination with non-zero slip angle, non-zero torque, and normal force are not considered in this document, but the accuracies of machines including inclination are referenced. SAE INTERNATIONAL J2675 NOV2017 Page 2 of 27 1.3 Test Machines This document is test machine neutral. It may be applied u
13、sing any type of test machine capable of fulfilling the requirements stated in this document. By way of example, specific data used in support of various parts of this document came from both an indoor flat-belt type machine, the CALSPAN Tire Research Facility (TIRF) (as it stood in 2004), and an ou
14、tdoor over-the-road dynamometer, the University of Michigan Transportation Research Institute (UMTRI) Mobile Tire Dynamometer. This document does not require a machine to match the ideal machine defined in 1.3.1, but does require that a test machines performance be fully defined over its range of ap
15、plication. Note: In this document, an ideal is a goal not a requirement. NOTE: The UMTRI Mobile Tire Dynamometer was decommissioned and is no longer available in response to an institute decision to no longer engage in testing. It is still mentioned in this revision because much of the backup data f
16、or SAE J2675 was taken with the UMTRI machine and experience with it shows the quality of information that can be obtained with a machine of this type. 1.3.1 Ideal Machine This document references an ideal machine which is capable of fully matching every item in this document, SAE J2429, and SAE J26
17、73. Such a machine neither exists currently nor is it certain that the technology to build such a machine exists. However, this recommended procedure does not depend on having an ideal machine. Useful data can be, and has been, gathered on existing machines. However, for repeatability and for situat
18、ions when data from different machines might be compared, it is important to document the capability of each machine that contributes data. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated,
19、the latest issue of SAE publications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. SAE CRP-11 Truck Tire Characterization, December 1995
20、 NOTE: CRP-11 is a book compiling the results of a very long and involved research study. It is indexed by the original statement of work (SOW) element numbers. Contained within CRP-11 are: M. G. Pottinger, W. Pelz, G. A. Tapia, and C. B. Winkler, “A Combined Cornering and Braking Test for Heavy Dut
21、y Truck Tires,” 4th International Symposium on Heavy Vehicle Weights and Dimensions, University of Michigan, Ann Arbor, MI, June 25-29, 1995, pp. 583-592. M. G. Pottinger, and W. Pelz, “Recommended Test Sample Sizes (SOW 1.5) and The CALSPAN/UMTRI Sample Sizes (SOW 1.5) and The CALSPAN/UMTRI Compari
22、son (SOW 3.0) for SOW 1.2.3 Data,” Smithers Scientific Services, Inc., April 12, 1995. SAE J670 Vehicle Dynamics Terminology SAE J2047 Tire Performance Technology SAE J2429 Free-Rolling Cornering Test for Truck and Bus Tires SAE J2673 Straight-Line Braking Test for Truck and Bus Tires SAE INTERNATIO
23、NAL J2675 NOV2017 Page 3 of 27 SAE 760029 Pottinger, M.G., Marshall, K.D., and Arnold, G.A., “Effects of Test Speed and Surface Curvature on Cornering Properties of Tires,“ SAE Technical Paper 760029, 1976, doi:10.4271/760029. SAE 770870 Marshall, K.D., Phelps, R.L., Pottinger, M.G., and Pelz, W., “
24、The Effect of Tire Break-In on Force and Moment Properties,“ SAE Technical Paper 770870, 1977, doi:10.4271/770870. SAE 810066 Pottinger, M.G. and Marshall, K.D., “The Effect of Tire Aging on Force and Moment Properties of Radial Tires,“ SAE Technical Paper 810066, 1981, doi:10.4271/810066. SAE 96018
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