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Classroom Asset: Measuring Friction

On June 26, 2019, the DDL team tested friction at the Thunderhill skid pad.  X1 was programmed to drive in a circle with a constant radius of 20 m at increasing speed until the car lost traction and spun out (and we had a lot of fun while doing it!)

This test is part 3 of a 3 part test which includes:

Variables:

  • Time: t_s
    Measured in seconds
  • Longitudinal speed: ux_mps
    Measured in meters/second
  • Lateral speed: uy_mps
    Measured in meter/second
  • Yaw Rate: r_rad
    Measured in radians/second
  • Heading: psi_rad
    Measured in radians counter-clockwise from north

     
Video: