A method to design an output feedback sampled-data controller with fixed structure that minimizes a continuous quadratic loss function, thus accounting for intersample behavior, is presented. The method involves three steps, first a continuous Linear Quadratic optimal control problem is formulated, then the discrete equivalent problem is found and finally this problem is reformulated as a parametric optimization problem which is solved using the loss increment technique. In the feedback we have used an averaging sampler to pre-filter the measured signals, thus circumvent the problems of sampling white noise
Godkänd; 1998; 20080416 (cira)