Chapter 6 Tutorial
Xmath Model Reduction Module 6-20 ni.com
fracred
fracred, the next command examined, has four options—"right
stab", "left stab", "right perf", and "left perf".
The options "left stab", "right perf", and "left perf" all
produce instability. Given the relative magnitudes of the Hankel singular
values, this is perhaps not surprising. Fig ures 6-16, 6-17, and 6-18
illustrate the results using "right stab".
Generate Figure 6-16:
svalsrol = svplot(sys*syscr,w,{radians})
plot(svalsol, {keep})
f16=plot(wc,constr,{keep,!grid,
legend=["reduced","original","constrained"],
title="Open-Loop Gain Using fracred()"})
Figure 6-16. Open-Loop Gain Using fracred