National Instruments 370760B-01

256 Chapter 6. Function Reference

Wperf = 100/makepoly([100,1],"s")

Wact = makepoly([0.5,0.05],"s")/makepoly([0.05,1],"s")

# Form the weighted interconnection structure

sysnames = ["plant";"Wperf";"Wact"]

sysinp = ["ref";"control"]

sysout = ["Wperf"; "Wact"; "ref-plant"]

syscnx = ["control"; ... # input to plant

"ref-plant"; ... # input to Wperf

"control"] # input to Wact

wghtic = sysic(sysnames,sysinp,sysout,syscnx,plant,...

Wperf,Wact)

# Design H2 controller

nctrls = 1

nmeas = 1

K2 = h2syn(wghtic,nmeas,nctrls)

# Form the weighted closed loop system and calculate

# its H2 norm.

wghtclp2 = starp(wghtic,K2)

h2norm(wghtclp2)?

ans (a scalar) = 2.78655