Design a series controller
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The process of a unity-feedback control system has the transfer function
100
Gp(s) = ------------------------
s^2 + 10 s + 100
Design a series controller (a PD, PI or PID) so that the following performance specifications are satisfied.
Steady-state error due to a step input = 0
Maximum overshoot < 2 percent
Rise time < 0.02 second
Carry out the design in the frequency domain and check the design in the time domain.
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Solution Summary
The response explains how it is natural to use a PD controller in this question.
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Answer:
Since the unity-feedback transfer function is , we have the open loop transfer function as .
For a type 1 system, which means there is a free integrator in , the steady-state error due to a step input is if is kept after G(s) is in series with a controller . Hence, PI or PID controller, which can increase the type of the system to eliminate the steady-state error, is not necessary in our case.
For a second order ...
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