Page 850 - The Mechatronics Handbook
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0066_frame_C27 Page 11 Wednesday, January 9, 2002 7:10 PM
20
10 M
Gain (dB) 0 r
−10 w r
−20
(a)
0
−45
Phase (deg) −135
−90
−180
0.2 w 0.5 w w 2 w
n n n n
Frequency w
3
2
1
Imaginary Axis 0
(b) w = ∞ w = 0
−1 M r
−2 • •
w n
w r
−3
−3 −2 −1 0 1 2 3
Real Axis
10
w w r
n
• •
M r
0
Gain (dB)
(c) w = 0
−10
ω
∞
−20
−180 −90 0 90
Phase (deg)
2
V
FIGURE 27.11 Three frequency response representations of G(s) = w n 2 /(s + 2 ω n s + w n 2 ): (a) Bode diagram, (b) polar
plot, and (c) Nichols chart.
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