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:

• Testing Constant Acceleration
• Testing Full Power Acceleration
• Measuring Friction

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: