Problems and Solutions for Section 7.4 (7.10-7.19)
7.10
Consider the magnitude plot of Figure P7.10.
How many natural frequencies does
this system have, and what are their approximate values?
0
10
4
10
3
10
2
10
1
10
0
10
20
30
40
Magnitude
50
(Hz)
Magnitude
0.01
0.1
20
40
60
80
(Hz)
1
Solution:
The system looks to have 8 modes with approximate natural frequencies of 2, 4,
10, 15, 22, 29, 36, and 47 Hz.
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