ME303 - Vehicle Dynamics Exam #20a) 11. (3 points, tit in the blank) Name the th

Question

ME303 - Vehicle Dynamics Exam #20a) 11. (3 points, tit in the blank) Name the three most common spring tyses common in sutomotive suspension systems aj 12. What is the name of a suspension design that uses a shorter A-arm on the top and typically a longer A-arm on the bottom? 13. The force developed by a suspension spring is proportional to the spring's: The force developed by shock, or damper has a force roughly proportional to its 14. (4 points) (short answer) Briefly define the following suspension rates AND give example urvits of the corresponding equation coefficient Spring rate: Units Wheel center rate: Units: Tire rate: Units: Ride rate: Units: 15. Under the assumption of an infinitely stiff tire, the ride rate becomes identical to the: (a) Roll rate (b) Spring rate (c) Tire rate (d) Wheel center rate (e) All of the above (f) Answers (a) and (b) (g) None of the above 16. Milliken's body roll axis is (a) on the line connecting the front and rear differential centers (b) along the body-fixed x-axis, pointing out the front of the vehicle (c) on a line connecting the geometric centers of the suspension attachment points (d) on a line connecting the front and rear instantaneous centers of rotation (e) all of the above

Explanation / Answer

11) Leaf Spring, coil or helical spring, torsion bar

12) Double wishbone suspension

13) length of compression

14) Spring rate refers to the amount of weight that is needed to compress a spring one meter

Units : N/m

Wheel Rate is basically the Spring Rate but measured at thewheel instead of the where the spring attaches to the linkage

units: N/m

Tire rate - vertical force per unit vertical displacement of at it operating load.Here it should be noted that tires vertical stiffness is also taken into account.

units: N
RIDE rate - vertical force per unit vertical displacement of tire ground contact point relative to chassis.

units: N

15) Infinitely stiff tire,ride rates and wheel center rate are almost EQUAL

16) Option D

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