This force, called cornering force or lateral force is perpendicular to the direction the wheel is pointing and happens in the center of the tyre contact patch. Fy = -m * Ay. Lateral Forces of Passenger Tires and Effects on Vehicle Response During Dynamic Steering S. A. Lippmann and K. L. Oblizajek UniroyalTire Co. AFTER A PERIOD of relative inaction, there has been a revival of interest in the relationship between the transient adjustments of the lateral steering forces of tires and the dynamics of steered vehicles. This means that, to have equilibrium, the four tyres will have to each produce a lateral force so that the sum of all four tyres lateral forces will be equal to Fy. LFV is measured according to processes specified by the ASTM Internationalin ASTM F1806 – Standard Practi… Lateral force variation (LFV) is a property of a tire that characterizes its dynamic behavior of these forces. The differential equation of cornering force adjustment is developed from experimental data. SAE Transactions Lateral force depends on steer angle, cornering condition and with positive caster produces a moment attempting to steer the vehicle out of turn causing understeer. SAE International is a global association of more than 128,000 engineers and related technical experts in the aerospace, automotive and commercial-vehicle industries. Request Permissions. By looking at the tire lateral deformation, the resultant lateral force may not be aligned with center of the contact surface. Fy = Fyfr + Fyfl + Fyrl + Fyrr… Read Online (Free) relies on page scans, which are not currently available to screen readers. JSTOR is part of ITHAKA, a not-for-profit organization helping the academic community use digital technologies to preserve the scholarly record and to advance research and teaching in sustainable ways. Lateral Tire Force : Friction Coefficient : ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( )|} tan tan) | tan tan | 3(tan tan {1 3| tan ' tan 2 3 sl sl sl sl M z F z a α α α α α α α α Tire Moment (Lateral): =−µ − + − Tires provide for steering, traction, braking, and load support by transmitting forces between the vehicle and the road. To access this article, please. With a personal account, you can read up to 100 articles each month for free. ©2000-2020 ITHAKA. This lateral force is sometimes called the cornering force when the side-slip angle is small. SAE International's core competencies are life-long learning and voluntary consensus standards development. The lateral deformation of the tire causes a lateral force to act through the contact surface, which is distributed according to the deformation.
The responses of the vehicle in certain maneuvers differ to some degree when the model is programmed with instantaneously reacting tires or with simulations of actual tires. All Rights Reserved.
The relation between lateral force and slip angle is reciprocal: The lateral force can be thought as a result of the slip angle, and the slip angle as a result of lateral force (if the lateral force … This equation is applied, for a typical radial ply tire,to a crude but sufficient mathematical model of a vehicle. The authors judge that there are slight and unimportant effects on the path and heading curves of the vehicle due to the delays in build-up cornering force. © 1976 SAE International JSTOR®, the JSTOR logo, JPASS®, Artstor®, Reveal Digital™ and ITHAKA® are registered trademarks of ITHAKA. The objective of the investigation is to provide a basis for judging whether or not the dynamic steering adjustments of the tire forces affect vehicle performance in a significant manner. Lateral forces This force (F y ) is acting on the tire centre which creates a moment, whose moment arm length is caster offset at ground. On the other hand, there appear to be detectabl eeffects that may be important in the sensory information provided to the driver. See fig. The lateral deflection taking place in the tyres gives rise to an elastic force.
This item is part of JSTOR collection For terms and use, please refer to our Terms and Conditions SAE International's charitable arm is the SAE Foundation, which supports many programs, including A World In Motion® and the Collegiate Design Series. High values of LFV for a given tire reflect a high level of manufacturing variations in the tire structure that will impart ride disturbances into the vehicle in the lateral, or steering, direction.