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Chapter 2 Robustness Analysis
© National Instruments Corporation 2-7 MATRIXx Xmath Robust Control Module
Figure 2-5. Stability Margin
Now examine the effect on the stability margin of discretizing H(s) at
100 Hz.
dt = 0.01;
Hd = discretize(H,dt);
margD = smargin(Hd,delb);
smargin --> Scaling algorithm is type: PF
smargin --> Margin computation 10% complete
smargin --> Margin computation 50% complete
smargin --> Margin computation 90% complete
100 Hz is a high discretization frequency for H, so the stability margin
is unchanged in the discrete-time case. The new plot is not much
different from Figure 2-6. Again, minimum margin is about 8 dB
at about 1/2 Hz.