Stability analysis of aperiodic sampled-data control systems: An approach using robust linear matrix inequalities

Stability analysis of an aperiodic sampled-data control system is discussed for application to network and embedded control. The stability condition is described in a linear matrix inequality to be satisfied for all possible sampling intervals. Although this condition is numerically intractable, a tractable sufficient condition can be constructed with the mean value theorem. Special care is paid on tightness of the sufficient condition for less conservative stability analysis. A region-dividing technique for reduction of conservatism and generalization to stabilization are also discussed. Examples show the efficacy of the approach.