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Unformatted text preview: Wm $536+? {MAE ME125BP
Monday, May 2nd, 2011
Midterm, Closed Book and Notes Problem 1. The symmetric (left/right) car below is shown Viewed from the front
a) what is the total weight on the outside wheels at zero speed?
b) What is the total weight on the outside wheels at velocity V and turning a comer oftadius R.
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a) is the combination statically balanced VE’S
b) when dynamically balancing the combination, what imbalance weights would you _ place and in What locations?
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a) compute the yaw rate gain ((yaw rate)/(steer angle) = 145 ) at low speeds (341:0)
b) compute the yaw rate gain for nonzero K. {a vow MUM“ (SEQ/gee) ‘5‘!” g9 % SW %»W3 8»? MG}: (059%) “W {L
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Problem 4. The road—to—body transfer function rs shown below for a 1Aucar model wrth a ”my €71" ““6555
leaf spring. Sketch the qualitative change in the transfer function when friction is added to the leaf spring and the Vibratiorr amplitude is small. Problem 5. In the ﬁgure below, vehicle instability causes the actual trajectory of the car
to differ from the desired trajectory. Describe the action of an electronic stability control
(ESC) system? A f“
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\ /” RX: Problem 6. When driving in sand, is it better to increase 0 decrease our tire inﬂation? When driving in the rain, is it better tr decrease your tire inﬂation? For maximum brakim, the tire rubber on the road should be moving at the same speed as the road (tine o aw Far maximum acceleration, it is better to have rear wheel drive than front whee} drive .. @or false). State your assumptions on the CG location. (:6— {'25 e emdét’tee‘? s? The tire critical speed is that speed at which centrifugal forces cause the tire to ﬂy apart (true [email protected] A torque converter can. output more torque than is input from the engine @or false). Sketch a pair of U—joints on a single drive shaft that are properly phased.
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Brake force propoitioning is independent of the amount of braking (true or .. A sway bar on th front of a car keeps the load on the left and right front wheels about
equal (true or The lagging shoe in a drum brake is more Iikeiy to stick when wet (true [email protected]). ...
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 PENNATHUR

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