6. A plant with transfer function G„(s) given by 1 Gp(s) = s(s + 4) is subject to a reference input R(s) and a disturbance input D(s), as shown in Figure Q6. The response C(s) is governed by a controller with transfer function G.(s). 3

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6. A plant with transfer function G„(s) given by
1
G„(s) =
s(s + 4)
is subject to a reference input R(s) and a disturbance input D(s), as shown in Figure Q6. The response
C(s) is governed by a controller with transfer function G.(s).
3
Control 3
Section 3 Tutorial: Feedback Control Systems
a) For the situation where there is no change in the reference input (i.e. R(s) = 0) derive the closed loop
transfer function relating the response C(s) to the disturbance D(s).
b) It is proposed to apply a proportional plus derivative controller to the system such that
G(s) = Kp + Kas
Calculate the values of the gains K, and Ka if the performance requirements for the system response
are that it should have a maximum overshoot of 5% and a natural frequency of 5 rad/s.
c) Integral action is now added with gain K; to give a PID controller. Using the values of K, and nd
calculated in part b) apply Routh's criteria to determine the range of values of K; which ensures
system stability.
d) When K; = 100 the system has a dominant pair of complex poles with associated damping ratio of
0.152 and natural frequency of 4.22 rad/s. Calculate the value of the third pole.
D(s)
R(s)
C(s)
G(s)
Gp(s)
Figure Q6.
Transcribed Image Text:6. A plant with transfer function G„(s) given by 1 G„(s) = s(s + 4) is subject to a reference input R(s) and a disturbance input D(s), as shown in Figure Q6. The response C(s) is governed by a controller with transfer function G.(s). 3 Control 3 Section 3 Tutorial: Feedback Control Systems a) For the situation where there is no change in the reference input (i.e. R(s) = 0) derive the closed loop transfer function relating the response C(s) to the disturbance D(s). b) It is proposed to apply a proportional plus derivative controller to the system such that G(s) = Kp + Kas Calculate the values of the gains K, and Ka if the performance requirements for the system response are that it should have a maximum overshoot of 5% and a natural frequency of 5 rad/s. c) Integral action is now added with gain K; to give a PID controller. Using the values of K, and nd calculated in part b) apply Routh's criteria to determine the range of values of K; which ensures system stability. d) When K; = 100 the system has a dominant pair of complex poles with associated damping ratio of 0.152 and natural frequency of 4.22 rad/s. Calculate the value of the third pole. D(s) R(s) C(s) G(s) Gp(s) Figure Q6.
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