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Lecture 6

# Lecture 6 - The Pennsylvania State University Department of...

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Unformatted text preview: The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Lecture 6: Vehicle Braking – Part 1 Fall 2007 Vehicle Braking What are the forces acting on a vehicle during braking? How long does it take a vehicle to stop? What role does braking play in highway engineering? Forces acting on a vehicle during braking f r [ ] g a f r W R ma h Wl L W θ sin ( 1 ±--= [ ] g a r f W R ma h Wl L W sin ( 1 ±-+ = Braking Forces For braking, grade resistance, WSin θ g = Wtan θ g = WG is negative for uphill and positive for downhill This is because going uphill gravity will brake the vehicle The maximum braking force (F b max ) is equal to the coefficient of road adhesion ( μ ) multiplied by the weights normal to the roadway surface Equations for F bfmax (front) and F brmax (rear) Braking Forces 2 After substituting equations for W f NOTE: μ = the coefficient of road adhesion (Table 2.4) f bf W F MAX μ = Braking Forces 3 Front Axle ( 29 [ ] rl r bf f h l L W F MAX + + = After substituting equations for W...
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Lecture 6 - The Pennsylvania State University Department of...

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