Design of reliable decentralized control systems guaranteeing H∞-norm performance bound for a class of uncertain linear plants

A decentralized control scheme with observer-based feedback controllers is developed for a class of uncertain linear plants, and it is shown that the resulting closed-loop system is reliable in the sense that the control scheme provides guaranteed stability and H_∞ -norm bounded performance in the event of soft-type sensor and/or actuator failures as well as in the presence of parameter uncertainties. We observed that soft-type failures were additional exogenous inputs in the closed-loop system. As a result, the sensor and/or actuator failures can be tolerated in the design, which is achieved by extending the result developed by the authors (1994)