Since its inception in the early 1980s, H( optimization theory has
become the control methodology of choice in robust feedback analysis and
design. The purpose of this monograph is to present, in a tutorial
fashion, a self contained operator theoretic approach to the H( control
for disturbed parameter systems, that is, systems which admit infinite
dimensional state spaces. Such systems arise for problems modelled by
partial differential equations or which have time delays. Besides
elucidating the mathematics of H( control, extensive treatment is given
to its physical and engineering underpinnings. The techniques given in
the book are carefully illustrated by two benchmark problems: an
unstable system with a time delay which comes from the control of the
X-29, and the control of a Euler-Bernoulli flexible beam with
Kelvin-Voigt damping.