A laboratory experiment can be modelled as a system with an open-loop transfer function 05 (a) P(s) =- (s² + 4s + 3) with a controller C(s) which has the transfer function K(s + 5) C(s)= s+8 where K > 0. (i) Derive and sketch the root-locus of the corresponding closed loop system. In your answer, show all intermediate steps such as the locations of the open-loop poles and zeros, the relative degree of the open-loop system, the number of asymptotes and their meeting point, and the location(s) of any double point(s) of the root locus. (ii) Comment on the characteristics of this system for small values of gain K and for larger values of K. Does the system become unstable? What is the maximal value of K for which the closed-loop system overdamped? Hint: The equation x + 13.5x + 60x + 75.5 = 0 has the solutions x, = -2.09, x2 = -5.71 + j1.90 and x, = -5.71 - j1.90.

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Q5
A laboratory experiment can be modelled as a system with an open-loop
transfer function
(a)
1
P(s) =
(s2 + 4s + 3)
with a controller C(s) which has the transfer function
K(s + 5)
C(s) =
s+8
where K > 0.
(i)
Derive and sketch the root-locus of the corresponding closed loop
system. In your answer, show all intermediate steps such as the locations
of the open-loop poles and zeros, the relative degree of the open-loop
system, the number of asymptotes and their meeting point, and the
location(s) of any double point(s) of the root locus.
(ii)
Comment on the characteristics of this system for small values of gain
K and for larger values of K. Docs the system become unstable? What
is the maximal value of K for which the closed-loop system
overdamped?
Hint: The equation x + 13.5x? + 60x + 75.5 = 0 has the solutions
x, = -2.09, x, = -5.71 + j1.90 and x, = -5.71 - j1.90.
Part (b) can be found overleaf...
Continued overleaf
Page 5 of 11
Figure Q5 shows the Bode diagram for the frequency response of the system
from (a) with K = 10.
(b)
(i)
Describe how the gain and the phase margins can be derived from the
Bode plot and determine their values.
(ii)
What is the maximal gain which can be applied to this system before it
becomes unstable.
Bode Diagram
-50
-100
-90
-180
102
10°
Frequency fradis)
Figure Q5
101
10
102
Magnitude (dB
Transcribed Image Text:Q5 A laboratory experiment can be modelled as a system with an open-loop transfer function (a) 1 P(s) = (s2 + 4s + 3) with a controller C(s) which has the transfer function K(s + 5) C(s) = s+8 where K > 0. (i) Derive and sketch the root-locus of the corresponding closed loop system. In your answer, show all intermediate steps such as the locations of the open-loop poles and zeros, the relative degree of the open-loop system, the number of asymptotes and their meeting point, and the location(s) of any double point(s) of the root locus. (ii) Comment on the characteristics of this system for small values of gain K and for larger values of K. Docs the system become unstable? What is the maximal value of K for which the closed-loop system overdamped? Hint: The equation x + 13.5x? + 60x + 75.5 = 0 has the solutions x, = -2.09, x, = -5.71 + j1.90 and x, = -5.71 - j1.90. Part (b) can be found overleaf... Continued overleaf Page 5 of 11 Figure Q5 shows the Bode diagram for the frequency response of the system from (a) with K = 10. (b) (i) Describe how the gain and the phase margins can be derived from the Bode plot and determine their values. (ii) What is the maximal gain which can be applied to this system before it becomes unstable. Bode Diagram -50 -100 -90 -180 102 10° Frequency fradis) Figure Q5 101 10 102 Magnitude (dB
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