EBK ELECTRICAL ENGINEERING
7th Edition
ISBN: 8220106714201
Author: HAMBLEY
Publisher: YUZU
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2. A system with unity feedback is shown below. The feed-forward transfer function is G(s), where
5
.
G(S) = (+1) Sketch the root locus for the variations in the values of pi.
(s+P1)s
R(s)
C(s)
G(s)
3. The following closed-loop systems in Fig. 1 and Fig. 2 operate with a damping ratio of 0.707
(=0.707). The system in Fig. 1 does not have a PI controller, while the one in Fig. 2 does.
R(s):
S
Gain
Plant
R(s) +
E(s)
1
C(s)
K
(s+1)(s+2)(s+10)
Fig. 1: Closed-loop system without PI controller
Compensator
Plant
R(s) +
E(s)
K(s+0.1)
S
1
(s+1)(s+2)(s+10)
C(s)
Fig. 2: Closed-loop system with a practical PI controller
a. Please use Matlab to find the intersection point between line and the root locus of the
system in Fig. 1. Then find the K value and one complex closed-loop pole corresponding
to the intersection point. Calculate the steady-state error. Show the Matlab code in your
answer sheet.
b. Please use Matlab to find the intersection point between § line and the root locus of the
system in Fig. 2. Then find the K value and one complex closed-loop pole associated with
the intersection point. Compare the complex closed-loop pole with the one you just found
in task a. Are they very…
1. Please draw the root locus by hand for the following closed-loop system, where G(s) =
s+6
=
S-2
s+8
s-2'
and H(s) = Find the range of K for stability using Method II in Examples 2 and 3 in
Lecture 15.
Input
R(s)
Output
C(s)
KG(s)
H(s)
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