SAE —Instrumentation for Impact Test SAE J—Vehicle Dynamics Terminology SAE J—Vehicle Aerodynamics Terminology SAE J—Test . Coordinate systems (,,,) rP x yz mobile triad with the origin in the rear contact point rP, according to SAE J x forward and parallel to the longitudinal plane of. SURFACE VEHICLE RECOMMENDED PRACTICEJ JAN Issued Revised SupersedingJe JUL(R) Vehicle Dynamics.

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This article is about tire behavior in vehicle dynamics.

Tire axis system and terminology defined by SAE standards

The overturning torque moment M x is the torque n670 is trying to rotate the wheel around the x-axis the wheel is falling over. In order to be able to analyze the forces sae j670 moments which are acting on a vehicle tire, especially during cornering, we need to define an sae j670 coordinate system. The normal force F z is the sae j670 applied aae the road to the wheel. Furthermore, it is essential to the effectiveness of any anti-lock braking system.

SAE Je Vehicle Dynamics Terminology_百度文库

When accelerating or braking a vehicle equipped with tires, the observed angular velocity of the tire does not match the expected velocity for pure rolling motion, which means there is sliding sar the tire and the road in addition to rolling.


By using this site, you agree to the Terms of Use sae j670 Privacy Policy. When the tire is inflated, the weight of the vehicle applies a normal vertical load on the wheel which causes the deflection of the tire. The rolling resistance torque moment Sae j670 y is the torque which opposes the wheel to turn around the y-axis. The origin O is the point of intersection of x,y and z sae j670.

The y-axis is perpendicular on sae j670 x-axis and the positive direction is pointing to the right side of the wheel. It is of fundamental importance in the field of vehicle dynamics, as j6670 allows to understand the relationship between the deformation of the tire and the longitudinal forces sae j670.

Race Car Vehicle Dynamics. It is negative pointing upwards and positive pointing downwards. Vehicle braking technologies Engineering ratios.

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Retrieved from ” https: From Wikipedia, the free encyclopedia. Sae j670 surface of contact between the tire and the road is called contact patch.

On front-wheel drive FWD vehicles there is an additional torque, the drive torque.

The origin O of the axis system it is located in the center of the contact patch. The positive direction of the x-axis is pointing towards the front of the sae j670.

All three axes are mutually orthogonalwhich means that they are perpendicular sae j670 each other. Views Read Edit View history.


The z-axis is normal to the road, the positive direction being downwards. There is no universally zae upon definition of sae j670 ratio.

The aligning torque moment M z is the torque which rotates the wheel around the z-axis.

sae j670 The dynamic performance of a road vehicle depends largely by the characteristics of the tire. The lateral force F y is positive towards the right, when the vehicle is moving forwards along the x-axis. sae j670

Slip ratio – Wikipedia

For the phenomenon in fluid dynamics, see Slip ratio gas-liquid flow. For the forces and torques action on the wheel, we will define which is jj670 positive direction. This page was last edited on 25 Juneat Sae j670 of Automotive Engineers. The torque generated by the powertrain is applied sae j670 the wheel through the tire.

Slip ratio is a means of calculating and expressing the slipping behavior of the wheel sae j670 an automobile. This slippage plays a major role in the generation of forces at the contact patch of the tire, and is thus of fundamental importance to determine the accelerations sae j670 vehicle can produce.