Road Track Friction

Configure road for braking test

Since R2021a

Description

The Road Track Friction block implements the road, including friction, for the Braking Test. Use the Type of surface parameter to specify the friction coefficient scaling factor:

• Constant friction coefficient scaling factor — Constant surface friction during the maneuver

• Split friction coefficient scaling factor — Two friction coefficients

  Select this option to specify the friction scaling coefficients for a split-mu braking test. Use the enabled parameters to set the ground friction and rectangular surface friction coefficient scaling factors.

Examples

Braking Test Reference Application

Simulate a full vehicle dynamics model undergoing a braking test. Use for vehicle dynamics ride and handling analysis and chassis controls development, including the dynamic response to split-mu tests.

Open Script

Ports

Input

XWhl — Wheel displacement along X-axis

4-by-1 array

Wheel displacement along the earth-fixed X-axis, specified as a 4-by-1 array.

YWhl — Wheel displacement along Y-axis

4-by-1 array

Wheel displacement along the earth-fixed Y-axis, specified as a 4-by-1 array.

Cg — Vehicle CG

3-by-1 array

Vehicle cg, along earth-fixed axis, specified as a 3-by-1 array.

Output

FricCoeffLambda — Friction coefficient applied to wheels

4-by-1 array

Wheel friction coefficient, specified as a 4-by-1 array.

Parameters

Type of surface — Friction

Split friction coefficient scaling factor (default) | Constant friction coefficient scaling factor

• Constant friction coefficient scaling factor — Constant surface friction during the maneuver

• Split friction coefficient scaling factor — Two friction coefficients

  Select this option to specify the friction scaling coefficients for a split-mu braking test. Use the enabled parameters to set the ground friction and rectangular surface friction coefficient scaling factors.

Scaling factor for the friction coefficient of ground, lambda_g — Scaling factor

.6 (default) | scalar

Scaling factor for the ground friction coefficient.

Scaling factor for the friction coefficient of rectangular surface, lambda_r — Scaling factor

.8 (default) | scalar

Scaling factor for the friction coefficient of the rectangular surface.

Dependencies

To enable this parameter, set Type of surface/track to Split friction coefficient scaling factor.

X coordinate of lower left corner of rectangular surface, r_x0 — X coordinate

175 (default) | scalar

X coordinate of lower left corner of rectangular surface, in earth-fixed coordinate system, in m.

Dependencies

To enable this parameter, set Type of surface/track to Split friction coefficient scaling factor.

Y coordinate of lower left corner of rectangular surface, r_y0 — X coordinate

-100 (default) | scalar

Y coordinate of lower left corner of rectangular surface, in earth-fixed coordinate system.

Dependencies

To enable this parameter, set Type of surface/track to Split friction coefficient scaling factor.

Rectangular surface width in X direction, r_xw — Rectangular surface

1000 (default) | scalar

Rectangular surface width in X direction, in m.

Dependencies

To enable this parameter, set Type of surface/track to Split friction coefficient scaling factor.

Rectangular surface width in Y direction, r_yw — Rectangular surface

500 (default) | scalar

Rectangular surface width in Y direction, in m.

Dependencies

To enable this parameter, set Type of surface/track to Split friction coefficient scaling factor.

Version History

Introduced in R2021a