HW_1_solution_Fall 2008

# HW_1_solution_Fall 2008 - VPI&SU Fall 2008 A. G. Hobeika...

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Fall 2008 A. G. Hobeika CEE3604--Homework #1 Solution Question 1 Use the vehicle forces shown in Figure 2.3 of the textbook, and by summing the moments about point B, provide the proof for Equation 2.15 max ( ) / .............. (2.15) 1 / r rl W l f h L F h L μ + = + Solution: The normal load on the front axle is given by summing the moments about point B cos sin In this equation, cos 1 for the small grades encountered in highway applications a r g g f g a f R h Wl mah Wh W L R h m W θ - + - - = = - - = max max max max max max sin ( ) [ ( ) ] (1 ) (1 ) ( ) / (1 ) g r a rl g r f rl r f rl r rl r rl r rl rl rl r rl ah Wh Wl L L F ma R R R Wl h W F R L L Wl h F W F R L L l h h F W F R L L L l h h F W R L L L l h W R L L F h L R f W W l f h L F h L - + = + + + = - - + = = - - + = - + + = + + = + = + = + Q Q

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A new sports car has a drag coefficient of 0.29 and a frontal area of 20 ft 2 , and is
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## This note was uploaded on 10/15/2008 for the course CEE 3604 taught by Professor Katz during the Fall '08 term at Virginia Tech.

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HW_1_solution_Fall 2008 - VPI&SU Fall 2008 A. G. Hobeika...

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