Body m Road Suspension Datum level Figure 1

International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter8: Centroids And Distributed Loads
Section: Chapter Questions
Problem 8.88P: Compute the surface area of the axi-symmetric domed structure.
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The quarter-car model of a vehicle suspension and its free body diagram are shown in Figure 1. In this simplified model, the masses of the wheel, tire, and axle are neglected, and the mass m represents one-fourth of the vehicle mass. The spring constant k models the elasticity of both the tire and the suspension spring. The damping constant c models the shock absorber. The equilibrium position of m when y=0 is x=0. The road surface displacement y(t) can be derived from the road surface profile and the car’s speed.

  1. Draw free body diagram (FBD) and derive the equation of motion of m with y(t) as the input, and obtain the transfer function.

If assume:

m=300 kg

k=20000, 40000, 60000 N/m

c=1000, 3000, 5000 N.s/m

  1. Plot magnification ratio vs frequency ratio (r=0-4) diagrams for the parameters given above (you can draw the three curves in one diagram for three different k values and do the same for the three c values as well).
  2. Use the derived transfer function to model the system and plot the step response for the system by Matlab or Simulink.
Body
m
Road
Suspension
Datum level
Figure 1
Transcribed Image Text:Body m Road Suspension Datum level Figure 1
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