User`s guide

9 Design Case Studies
9-40
You are now ready to compare the open- and closed-loop Bode responses from
disturbance to thickness gap.
bode(Px(1,2:3),'--',clx(1,2:3),'-',{0.1 100})
The dashed lines show the open-loop response. Note that the peak gain of the
eccentricity-to-gap response and the low-frequency gain of the
input-thickness-to-gap response have been reduced by about 20 dB.
Finally, use
lsim to simulate the open- and closed-loop time responses to the
white noise inputs and . Choose
dt=0.01 as sampling period for t he
Frequency (rad/sec)
Phase (deg); Magnitude (dB)
Bode Diagrams
−100
−80
−60
−40
−20
0
From: w−ex From: w−ix
10
−1
10
0
10
1
10
2
−300
−250
−200
−150
−100
−50
0
To: x−gap
10
−1
10
0
10
1
10
2
w
ex
w
ix