SAE J2731 Low Speed Enveloping Test with Perpendicular and Inclined Cleats
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时间:2024-05-19 05:45:10
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Product Code:SAE J2731
Title:Low Speed Enveloping Test with Perpendicular and Inclined Cleats
Issuing Committee:Vehicle Dynamics Standards Committee
Scope:This SAE Recommended Practice describes a test method for measuring the forces and moments generated at a spindle when a tire rolls over a rectangular obstacle, cleat, at very low speed. The cleatused in a particular test condition is configured with its crest perpendicular, 90, to the path of the tire or optionally with its crest inclined at an angle to the path of the tire. The carraige to which the spindle is attached is rigidly constrained in position during each test condition so as to provide a good approximation to fixed loaded radius operation. The method discussed in this Recommended Practice provides cleat envelopment force and moment and tire angular position histories as functions of distance traveled. These histories are essentially free from variations due to tire non-uniformitites. The method applies to any size tire so long as the equipment is properly scaled to conduct the measurements for the intended test tire. The data are suitable for use in determining parameters for road load models and for comparative evaluations of the measured properties 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 otherwise. Within the context of this document, forces applied to the road or terrain surfaces are not considered.
Title:Low Speed Enveloping Test with Perpendicular and Inclined Cleats
Issuing Committee:Vehicle Dynamics Standards Committee
Scope:This SAE Recommended Practice describes a test method for measuring the forces and moments generated at a spindle when a tire rolls over a rectangular obstacle, cleat, at very low speed. The cleatused in a particular test condition is configured with its crest perpendicular, 90, to the path of the tire or optionally with its crest inclined at an angle to the path of the tire. The carraige to which the spindle is attached is rigidly constrained in position during each test condition so as to provide a good approximation to fixed loaded radius operation. The method discussed in this Recommended Practice provides cleat envelopment force and moment and tire angular position histories as functions of distance traveled. These histories are essentially free from variations due to tire non-uniformitites. The method applies to any size tire so long as the equipment is properly scaled to conduct the measurements for the intended test tire. The data are suitable for use in determining parameters for road load models and for comparative evaluations of the measured properties 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 otherwise. Within the context of this document, forces applied to the road or terrain surfaces are not considered.
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