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Steady-State Directional Control Test Procedures for Passenger Cars and Light Trucks

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J266_201811
  • Current
Published 2018-11-28 by SAE International in United States

This SAE Recommended Practice establishes consistent test procedures for determination of steady-state directional control properties for passenger cars and light trucks with two axles. These properties include the steering-wheel angle gradient, reference steer angle gradient, sideslip angle gradient, vehicle roll angle gradient, and steering-wheel torque gradient with respect to lateral acceleration. They also include the yaw velocity gain, lateral acceleration gain, and sideslip angle gain with respect to steering-wheel angle. Additionally, the characteristic or critical speed and the front and rear wheel steer compliances may be determined.

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Tire Normal Force/Deflection and Gross Footprint Dimension Test

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J2704_201811
  • Current
Published 2018-11-20 by SAE International in United States

This SAE Recommended Practice describes a test method for determining the vertical force and deflection properties of a non-rolling tire and the associated contact patch length and width. The method applies 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 use in determining parameters for road load models and for comparative evaluations of the measured properties in research and development.

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Low Speed Enveloping Test with Perpendicular and Inclined Cleats

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J2731_201811
  • Current
Published 2018-11-20 by SAE International in United States

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 cleat used in a particular test condition is configured with its crest either perpendicular, 90 degrees, to the path of the tire or optionally with its crest inclined at an angle to the path of the tire. The carriage 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 document 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-uniformities. 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.

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Tire Quasi-Static Envelopment of Triangular/Step Cleats Test

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J2705_201811
  • Current
Published 2018-11-20 by SAE International in United States

This SAE Recommended Practice describes a test method for determining properties of a non-rolling tire quasi-statically enveloping either a set of triangular cleats or a single step cleat. In the case of the triangular cleats, the normal force and vertical deflection of the non-rolling tire are determined. In the case of the step cleats, the normal force, longitudinal force, and vertical deflection of the non-rolling tire are determined. The method applies to any tire so long as the quipment is properly sized to correctly conduct the measurements for the intended test tire. The data are intended for use in determining parameters for road load models and for comparative evaluations of the measured properties in research and development.

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Test for Tire Quasi-Static Longitudinal Force versus Longitudinal Displacement and Quasi-Static Lateral Force versus Lateral Force

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J2718_201811
  • Current
Published 2018-11-20 by SAE International in United States

This SAE Recommended Practice describes application of two closely related test procedures, which together determine the linear range longitudinal and lateral stiffnesses of a statically loaded non-roating tire. The procedures apply to any tire so long as the equipment is properly sized to correctly 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.

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Tests to Define Tire Size (Geometry), Mass, Inertias

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J2717_201811
  • Current
Published 2018-11-20 by SAE International in United States

This SAE Recommended Practice describes a trio of test methods which determine basic tire size (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 properties in research and development.

Low Speed Enveloping Test with Perpendicular and Inclined Cleats

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J2731_201805
  • Historical
Published 2018-05-16 by SAE International in United States
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 cleat used in a particular test condition is configured with its crest either perpendicular, 90 degrees, to the path of the tire or optionally with its crest inclined at an angle to the path of the tire. The carriage 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 document 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-uniformities. 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…
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Tests to Define Tire Size (Geometry), Mass, and Inertias

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J2717_201805
  • Historical
Published 2018-05-16 by SAE International in United States
This SAE Recommended Practice describes a trio of test methods which determine basic tire size (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 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 unpaved. Within the context of this Recommended Practice, forces applied to the surface on which the tire is operating are not considered.
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Tire Quasi-Static Envelopment of Triangular/Step Cleats Test

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J2705_201803
  • Historical
Published 2018-03-18 by SAE International in United States
This SAE Recommended Practice describes a test method for determining properties of a non-rolling tire quasi-statically enveloping either a set of triangular cleats or a single step cleat. In the case of the triangular cleats the normal force and vertical deflection of the non-rolling tire are determined. In the case of the step cleats the normal force, longitudinal force, and vertical deflection of the non-rolling tire are determined. The method applies to any tire so long as the equipment is properly sized to correctly conduct the measurements for the intended test tire.1 The data are intended 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 pavements. Within the context of this document, forces applied to the pavement are not considered.
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Measurement of Vehicle and Suspension Parameters for Directional Control Studies - Rationale

Vehicle Dynamics Standards Committee
  • Ground Vehicle Standard
  • J1574/2_201801
  • Current
Published 2018-01-02 by SAE International in United States
This SAE Information Report presents the background and rationale for SAE J1574-1. The motor vehicle industry is working toward a more complete understanding of the factors affecting the motions of vehicles on the roadway, by using a variety of techniques that predict responses to road and operator inputs. The capability to predict responses is desirable so that vehicles can be designed for optimum safety and utility. In addition to the force and moment properties of the pneumatic tires, a number of vehicle and suspension parameters affect the response of the vehicle; these include weight, center-of-gravity location, moments of inertia, suspension ride and roll rates, suspension kinematic and compliance properties, and shock absorber characteristics. These parameters must be quantified in order to predict vehicle responses. Measurement of most of these parameters will be limited to determining their values in the linear range for use in directional control simulations. The limitation to linear range characteristics primarily reflects current measurement practice, to which SAE J1574-1 is directed. In the case of mass and inertia properties, this limitation clearly…
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