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Chapter 2 Robustness Analysis
MATRIXx Xmath Robust Control Module 2-14 ni.com
Comparing Scaling Algorithms
Using the system from the first example (Figure 2-3), you can compare
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.
Figure 2-8. Results of Scaling Algorithm Options