National Instruments 370757C-01 Manuale Utente
Chapter 2
Robustness Analysis
2-14
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Comparing Scaling Algorithms
Using the system from the first example (Figure 2-3), you can compare
the results of using the three scaling algorithms:
the results of using the three scaling algorithms:
MARG_PF=smargin(H,delb,{scaling="PF",!graph});
MARG_OS=smargin(H,delb,{scaling="OS",!graph});
MARG_OPT=smargin(H,delb,{scaling="OPT",!graph});
plot ([MARG_PF,MARG_OS,MARG_OPT],{xlog,
legend=["PF","OS","OPT"],xlab="Frequency, Hz.",
ylab="Stability margin, dB"})
Figure 2-8 plots the margins produced by the three scaling algorithms.
Notice that in this problem the three scalings yield identical stability
margins.
Notice that in this problem the three scalings yield identical stability
margins.
Figure 2-8. Results of Scaling Algorithm Options