Q3. A cruise control model is shown in figure A. For simplicity we assume that the rotational inertia of the wheels is negligible and that there is friction retarding the motion of the car that is proportional to the car's speed with a proportionality constant b. The car can then be approximated for modelling purposes using the free-body diagram seen in figure B, where the engine imparts a force u is shown.

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Q3. A cruise control model is shown in figure A. For simplicity we assume that the rotational inertia
of the wheels is negligible and that there is friction retarding the motion of the car that is
proportional to the car's speed with a proportionality constant b. The car can then be approximated
for modelling purposes using the free-body diagram seen in figure B, where the engine imparts
a force u is shown.
A. Cruise control model
Friction
force bi
B. Free-body diagram for cruise control
Equation of motion of the system is given by
ubx' = mx"
1. Find the transfer function between the input u and the output car speed v.
2. Assume that the car mass m is 1000 kg and friction coefficient, b = 42 N-sec/m. Obtain the
expression of system response to a step input u=564 N.
3. Calculate time constant of the system and fill the following blank. (please keep one digit after
decimal point)
4. If mass of the car m is increased by 20%, will the cruise control system take longer or shorter
time to reach steady-state response (stable response)? Please explain the reason with necessary
calculation.
**Hint: v = x'
Transcribed Image Text:Q3. A cruise control model is shown in figure A. For simplicity we assume that the rotational inertia of the wheels is negligible and that there is friction retarding the motion of the car that is proportional to the car's speed with a proportionality constant b. The car can then be approximated for modelling purposes using the free-body diagram seen in figure B, where the engine imparts a force u is shown. A. Cruise control model Friction force bi B. Free-body diagram for cruise control Equation of motion of the system is given by ubx' = mx" 1. Find the transfer function between the input u and the output car speed v. 2. Assume that the car mass m is 1000 kg and friction coefficient, b = 42 N-sec/m. Obtain the expression of system response to a step input u=564 N. 3. Calculate time constant of the system and fill the following blank. (please keep one digit after decimal point) 4. If mass of the car m is increased by 20%, will the cruise control system take longer or shorter time to reach steady-state response (stable response)? Please explain the reason with necessary calculation. **Hint: v = x'
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