qAnother way to bound the
frequency response is to treat and as norm bounded uncertainities;
that is,
q P(s,a,b)Î {P0+W1
D1+W2D2 | ||Di||¥ £ 1}
q with P0=P(s,0,0) and
q
w
• It is in fact easy to
show that
•{P0+W1D1+W2D2 | ||Di||¥ £ 1} = {P0+WD | ||D||¥ £ 1}
q with |W|=|W1|+|W2|.
q
•
w