This paper deals with a new method to control
flexible structures by designing non-collocated sensors and actuators satisfying a pseudo-collocation
criterion in the low-frequency domain. This
technique is applied to a simply supported plate with a point force
actuator and a piezoelectric sensor, for which we give some theoretical and
numerical results. We also compute low-order controllers which stabilize
pseudo-collocated systems and the closed-loop behavior show that this approach
is very promising.