Class_7_Tractive_Effort_and_Vehicle_Acce

Class_7_Tractive_Effort_and_Vehicle_Acce - The Pennsylvania...

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Unformatted text preview: The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Class #7: Tractive Effort and Vehicle Acceleration Spring 2008 Overview Available tractive effort How much can the engine generate? How much can the tire/road deliver? Vehicle acceleration Maximum Tractive Effort At some point, the engine can develop additional power beyond which can be supported by the pavement / tire interface. At this point, the additional power will merely spin the wheels. No vehicle acceleration. Available Tractive Effort 1 2 Available Tractive Effort f r mah To Calculate W r L Wh mah Wl h R W g g f a r sin cos + + = Available Tractive Effort f r mah To Calculate W f L Wh mah Wl h R W g g r a f sin cos +-= Looking Back and Substituting L Wh mah Wl h R W g g f a r sin cos + + = YIELDS ) sin ( g a f r W ma R L h W L l W + + + = Looking Back and Substituting g rl a R R R ma F + + + = Eq. 2.2 RECALL YIELDS g a rl R R ma R F + + =-) sin ( g a f r W ma R L h W L l W + + + = ) ( rl f r R F L h W L l W-+ = For a Rear Wheel Drive Car r W F = max ) ( rl f r R F L h W L l W-+ = --= L h L h f l W F rl f MAX 1 ) ( For a Front Wheel Drive Car + + = L h L h f l W F rl r MAX 1 ) ( Example Problem 1 A 2,500 lb car is at rest. It has a 120-inch wheel base. The center of gravity is 40-inches above the pavement and 40-inches behind the front axle. What is the maximum tractive effort if: a) the car is front wheel drive, b) the car is rear wheel drive....
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This note was uploaded on 06/08/2009 for the course CE 321 taught by Professor Petrucha during the Spring '02 term at Pennsylvania State University, University Park.

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Class_7_Tractive_Effort_and_Vehicle_Acce - The Pennsylvania...

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