Tracking and Disturbance Rejection for an Uncertain System Using Fast Output Sampling

摘要

It is shown how a recently proposed sampled-data, multi-rate output feedback controller can be designed to realise ihe effect of robust stare feed- back, so that when applied simultaneously to a family of linear plants, the closed-loop eigenvalues are retained. This is not possible when a Luenberger obseriver is used to realise state feedback. The multi- rate control law proposed here is useful because It allows to utilise previously developed LMI methode for robust srate feedback design when the full state is not available for feedback. A practical design example is presented, and experimenial results show that, using the same statefeedback design, the multi- rate controller gives performance superior to that achieved with an observer.