Road Profile
Road profile with varying elevation and friction properties
Libraries:
Simscape /
Driveline /
Tires & Vehicles
Description
The Road Profile block represents a road profile with varying elevation and friction properties. You can connect this block to the Vehicle Body block. As a vehicle travels, the axle parameters and the position of the center of gravity (CG) determine the position of the front and rear axles. The block uses the axle positions to compute vehicle angle and, optionally, tire friction coefficients. The block models friction using either Magic Formula or kinetic and static friction coefficients.
Variables
To set the priority and initial target values for the block variables prior to simulation, use the Initial Targets section in the block dialog box or Property Inspector. For more information, see Set Priority and Initial Target for Block Variables.
Nominal values provide a way to specify the expected magnitude of a variable in a model. Using system scaling based on nominal values increases the simulation robustness. Nominal values can come from different sources, one of which is the Nominal Values section in the block dialog box or Property Inspector. For more information, see Modify Nominal Values for a Block Variable.
Ports
Conserving
Output
Parameters
Main
Horizontal distance from the center of gravity (CG) to the front axle. Specify the same
value as is specified for the Horizontal distance from CG to
front axle parameter of the connected
Vehicle Body block. Use the distance
when the angle is 0. The block uses the small angle
approximation.
Horizontal distance from the center of gravity (CG) to the rear axle. Specify the same
value as is specified for the Horizontal distance from CG to
rear axle parameter of the connected
Vehicle Body block. Use the distance
when the angle is 0. The block uses the small angle
approximation.
Table lookup corresponding to the distance that the CG of the vehicle moves relative to the reference frame x-axis. For example the figure shows a horizontal profile of [-10, 0, 10]. Table lookup extrapolation is nearest.
Table lookup corresponding to the distance that the CG of the vehicle moves relative to the reference frame y-axis. For example the figure shows a vertical profile of [2, 0, 5]. Table lookup extrapolation is nearest.
Whether to use smooth interpolation or linear interpolation when the block interpolates the profile coordinates.
Friction
Type of friction coefficient that the block outputs. Select
Physical signal Magic Formula
coefficients to vary friction for Tire (Magic
Formula) blocks. Select Physical signal
friction coefficients to vary friction for
Tire (Friction
Parameterized) blocks.
Friction profile horizontal distance.
Dependencies
To enable this parameter, set Friction output to either:
Physical signal Magic Formula coefficients
Physical signal friction coefficients
Magic Formula coefficients specified as an n-by-4 matrix, where n is the number of points in the vector specified by the Horizontal distance for friction profile parameter.
Dependencies
To enable this parameter, set Friction output to Physical signal Magic Formula coefficients.
Magic Formula coefficients specified as an n-by-4 matrix, where n is the number of points in the vector specified by the Horizontal distance for friction profile parameter.
Dependencies
To enable this parameter, set Friction output to Physical signal Magic Formula coefficients.
Front axle static and kinetic friction coefficients specified as an n-by-2 matrix, where n is the number of points in the vector specified by the Horizontal distance for friction profile parameter.
Dependencies
To enable this parameter, set Friction output to Physical signal friction coefficients.
Rear axle static and kinetic friction coefficients specified as an n-by-2 matrix, where n is the number of points in the vector specified by the Horizontal distance for friction profile parameter.
Dependencies
To enable this parameter, set Friction output to Physical signal friction coefficients.
