49 Vehicle Mechanics 2.9 a. Find the wheel speed of the vehicle given in Problem 2.8 when the vehicle velocity is 60 mph and the wheel slip is 15%. b. The coefficient of friction as a function of wheel slip is given by µ ( ) s a = − µ (1 e c − bs pk ) − s The parameters for the coefficient of friction on a dry pavement are as follows: µ pk = = 0.85, a b 1.1, 2 = = 0, and c 0.0035 Calculate the traction force limit for slip = 15% on a 1% slope with a driver and a passenger for the vehicle in Problem 2.8. REFERENCES 1. J.Y. Wong, Theory of Ground Vehicles , John Wiley & Sons, Inc., Hoboken, NJ, 2008. 2. W.E. Meyer and H. W.
Kummer, “Mechanism of Force Transmission Between Tire and Road,” SAE Publication No. 490A, National Automobile Week, March 1962. 3. T.D. Gillespie, Fundamentals of Vehicle Dynamics , SAE International, Warrendale, PA, 1992.