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ME125BP_Midterm_Solutions

ME125BP_Midterm_Solutions - Wm $536{MA-E ME125BP Monday May...

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Unformatted text preview: Wm $536+? {MA-E 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. “l "soil; Ema—mg ”:2“; T w m t" M (Q to? fiyurmmeer trek $3 .28 t V W "a? CD \éfl ZMomewte ahead? A eWéaE egg! h e" O wwmwfiaewg 3“ E i is .i st E" a all? .72.. % i '3 Problem 2. A tire and wheel is shown below with imbalance masses. a) is the combination statically balanced VE’S b) when dynamically balancing the combination, what imbalance weights would you _ place and in What locations? . ‘3‘“ WW Problem 3. For a cornering car a) compute the yaw rate gain ((yaw rate)/(steer angle) = 145 ) at low speeds (341:0) b) compute the yaw rate gain for nonzero K. {a vow MUM“ (SEQ/gee) ‘5‘!” g9 % SW %»W3 8»? MG}: (059%) “W {L V - V / x m 0“) <33 L. /f:::;iwmm “a“ . . . f“ . ‘ . Problem 4. The road—to—body transfer function rs shown below for a 1Aucar model wrth a ”my €71"- ““6555 leaf spring. Sketch the qualitative change in the transfer function when friction is added to the leaf spring and the Vibratiorr amplitude is small. Problem 5. In the figure below, vehicle instability causes the actual trajectory of the car to differ from the desired trajectory. Describe the action of an electronic stability control (ESC) system? A f“ degired momma Li/ a m brake-£- 4 dd; 601$? away-w.“ a \ ta am “gram it /<f \ /” 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 t-r 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. “ m ’53 fl 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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