User`s guide

Table Of Contents

9 Design Case Studies

9-46

You are now ready to simulate the open- and closed-loop responses to the

driving white noises

wx (for the -axis) and wy (for the -axis).

wxy = [wx ; wy]

lsim(Pc(1:2,3:6),':',cl(1:2,3:6),'-',wxy,t)

The response reveals a severe deterioration in regulation performance along

the -axis (the peak thickness variation is about four times larger than in the

simulation wit hout cross-coupling). Hence, designing for one loop at a time is

inadequate for this level of cross-coupling, and you must perform a joint-axis

MIMO design to correctly handle coupling effects.