Saturated H control of networked systems under stochastic transmission delays: The random sampling periods case

In this paper, the H-infinity saturated control problems of networked systems with random sampling periods and stochastic transmission delays are investigated. The main issue is to design an H-infinity saturated controller such that the controlled close-loop system is exponentially mean-square stable with a desired H-infinity performance. A matrix exponential which is different from some existing literature is used to reconstruct the discrete-time stochastic system to an equivalent yet tractable augmented model without any additional conditional constraint. In virtue of reduced-order confluent Vandermonde matrix approach and Kronecker product operation, the stability condition in terms of linear matrix inequality is derived and then the desired H-infinity saturated controller is designed. It should be emphasized that the improved method can also be used for the stability analysis and controller design when the system matrix contains complex roots. Finally, two numerical examples and a three-axis milling machine system are utilized to manifest the reliability and practicality of the designed strategy.