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Unformatted text preview: ME 131 Vehicle Dynamics Homework 1, Solutions Due Tuesday, February 2nd, 2010 1 Slip Angle and Steer Angle a. Define Slip Angle (1 pt) Slip angle is the angle between the orientation of the tire and the orientation of the velocity vector of the wheel. b. Why can slip angle be neglected at low speeds? (1 pt) Tire force is a linear function of slip angle. At low speeds, the forces are very low, and it can be as- sumed that the slip angles are very close to zero. c. In the bicycle model it is assumed that each tire has the same steer angle. Is this true in practice? Why or why not? (2 pts) No. Each tire turns a slightly different amount. This is usually done to reduce scrub. 2 Lateral Dynamics 2.1 Steering Angle and Banking a. A Porsche 911 is traveling around a circular track of diameter 400m at a constant 30 m/s without using any steering. Due to what should have been an obvious engineering error, the engine in the Porsche is placed behind the rear wheels. Assume 60 % of the vehicles weight is on the rear tires. Assume the vehicles massbehind the rear wheels....
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- Spring '09