Problem 2 (a): Match each ODE to its corresponding step response. All initial conditions are zero. ODE 4x+2x+4x=4u(t) Graph Step responses Graph 1 Graph 2 Graph 3 1 1 2 0.8 0.8 1.5 *+2x+100x = 100u(t) 0.6 0.6 1 0.4 0.4 2+8x+8x= 16u(t) 0.5 0.2 0.2 +5x+100x = 100u(t) 4x + x = u(t) Q 0 1 2 3 4 5 0 5 10 15 20 0 1 2 3 4 5 Graph 4 1.5 0.5 x + x = u(t) 1.5 0.5 Graph 5 Graph 6 1.5 0.5 0° 1 2 0 1 2 3 4 5 Ο 5 10 15 20

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Problem 2 (a): Match each ODE to its corresponding step response. All initial conditions are zero.
ODE
Graph
Step responses
4x+2x+4x=4u(t)
Graph 1
0.8
0.8
*+2x+100x =
100u(t)
0.6
0.6
0.4
0.4
2x+8x+8x=16u(t)
0.2
0.2
*+5x+100x = 100u(t)
4x+x= u(t)
Graph 2
1.5
0.5
Graph 3
1
4 5
0
5 10 15 20
0
1
2 3
4 5
Graph 4
1.5
0.5
x+x= u(t)
1.5
0.5
Graph 5
Graph 6
1.5
0.5
1
2
1 2 3 4 5
5
10
15 20
Problem 2 (b): The poles (roots) of five linear systems are plotted below in the s-domain. Each
system is indicated by a different marker (e.g., both triangle markers are for system iii).
(a) What is the order of each system?
Imaginary axis (rad/sec)
5
4
O(ii)
1
32-
-2
-3
*(i)
O
A
(iii)
(iv)
x
x
ㅁ
A(v)
(i)
(ii)
(iii)
(iv)
(v)
(b) Which systems are stable?
(i)
(ii) (ii) (iv) (v)
(b) Rank the stable systems in order of settling time
← Fastest
Slowest →
-4
-5
(d) Which 2nd-order system has the largest wn?
-7 -6 -5 -4 -3 -2 -1 0 1 2 3 (e) Which 2nd-order system has the largest ??
Real axis (rad/sec)
Transcribed Image Text:Problem 2 (a): Match each ODE to its corresponding step response. All initial conditions are zero. ODE Graph Step responses 4x+2x+4x=4u(t) Graph 1 0.8 0.8 *+2x+100x = 100u(t) 0.6 0.6 0.4 0.4 2x+8x+8x=16u(t) 0.2 0.2 *+5x+100x = 100u(t) 4x+x= u(t) Graph 2 1.5 0.5 Graph 3 1 4 5 0 5 10 15 20 0 1 2 3 4 5 Graph 4 1.5 0.5 x+x= u(t) 1.5 0.5 Graph 5 Graph 6 1.5 0.5 1 2 1 2 3 4 5 5 10 15 20 Problem 2 (b): The poles (roots) of five linear systems are plotted below in the s-domain. Each system is indicated by a different marker (e.g., both triangle markers are for system iii). (a) What is the order of each system? Imaginary axis (rad/sec) 5 4 O(ii) 1 32- -2 -3 *(i) O A (iii) (iv) x x ㅁ A(v) (i) (ii) (iii) (iv) (v) (b) Which systems are stable? (i) (ii) (ii) (iv) (v) (b) Rank the stable systems in order of settling time ← Fastest Slowest → -4 -5 (d) Which 2nd-order system has the largest wn? -7 -6 -5 -4 -3 -2 -1 0 1 2 3 (e) Which 2nd-order system has the largest ?? Real axis (rad/sec)
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