Figure 6-11. step response with wtbalance – National Instruments NI MATRIXx Xmath User Manual

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Chapter 6

Tutorial

6-15

Xmath Model Reduction Module

Generate Figure 6-11:

tvec=0:(140/99):140;

compare(syscl,sysclr,tvec,{type=7})

f11=plot({keep,legend=["original","reduced"]})

Figure 6-11. Step Response with wtbalance

Figures 6-9, 6-10, and 6-11 are obtained for

wtbalance

with the option

"input spec"

. Evidently, there is little difference between this and the

result with the option

"match"

. One notices marginally better matching in

the region of interest (0.1 to 5 rad per second) at the expense of matching
at other frequencies. The weighted Hankel singular values again indicate
that it is reasonable to seek a second order controller.