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J2429 - Free-Rolling Cornering Test for Truck and Bus Tires

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Document Number: J2429
Project Initiation: 10-27-2010
Sponsor Name:
Free-Rolling Cornering Test for Truck and Bus Tires
This SAE Recommended Practice describes a test method for determination of heavy truck (Class VI, VII, and VIII) tire force and moment properties under free-rolling cornering conditions. The steady-state properties are acquired as functions of slip angle and normal force, which are changed incrementally using a sequence specified in this document. The data are suitable for use in vehicle dynamics modeling, comparative evaluations for research and development purposes, and manufacturing quality control. This document addresses two principal topics; a) the description of a hypothetical “Ideal Machine,” and b) a standard directly applicable to testing practices currently common to the industry. The references to the “Ideal Machine” are meant to provide a roadmap for the testing machine manufacturer, providing direction and goals for the next generation of testing capabilities. The ranges of parameters for the “Ideal Machine,” including those in Tables 2 and 3, are intended to represent minimal requirements to meet the full and complete data needs of the industry. The remaining documentation provides practical guidelines for the test engineer to ensure the integrity of data generated using current and conventional means. Effects Not Considered-The effects of inclination angle and spindle torque or any combination of inclination and spindle torque with slip angle and normal force are not considered in this document. Test Machines-This document is test machine neutral. It may be applied using 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 and outdoor over-the-road dynamometer. This document does not require a machine to match the ideal machine, but does require that a test machine?s performance be fully defined over its range of application. In this document, an ideal is a goal not a requirement. Ideal Machine An ideal machine is a machine which is capable of fully matching every item in this document. Such a machine neither exits at the time this document was written nor is it certain that the technology to build such a machine exists at this time.
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