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Unformatted text preview: CEE 3604: Introduction to Transportation Engineering Fall 2011 Assignment 3: Vehicle Forces and Kinematics Date Due: September 16, 2011 Instructor: Trani Problem 1 a) A commuter train with a mass of 305,000 kg. travels downhill at a grade of -2% and 50 mph when the brakes fail. Estimate the maximum speed the train will achieve downhill if the following parameters apply: S = 14 m 2 , f roll = 0.0018, C d = 0.75 (dim) and C l = 0.03 (dim) b) During normal operations, the train described in part (a) has a tractive force as shown in Table 1. The tractive force was obtained from actual testing of the vehicle. Table 1. Tractive Force for Train in Problem 1. Speed (m/s) Tractive Force (N) 180000 20 155000 40 95000 60 65000 80 50000 100 35000 c) Plot the speed vs tractive force data shown in Table 1 using Matlab. d) Using Matlabs basic fitting capabilities, obtain a third degree polynomial (cubic equation) that relates the tractive force as a function of speed. Write down the equation of the cubic model. The equation is of the form:a function of speed....
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This note was uploaded on 12/31/2011 for the course CEE 3604 taught by Professor Katz during the Fall '08 term at Virginia Tech.
- Fall '08