Fault-tolerant flight tracking control with stuck faults

This paper is concerned with the problem of flight tracking control in the presence of stuck-actuator faults. A stuck fault is modeled as a bounded input, and its effect on the closed-loop system is described by a peak-to-peak gain. A fault-tolerant flight controller design method is developed based on the H_∞ and peak-to-peak gain performance indexes in a multiobjective optimization setting, and the proposed iterative LMI-based algorithm is shown to have some convergence properties. The design is such that the nominal performance of the resultant closed-loop system is optimized subject to the requirement that all the closed-loop systems corresponding to different fault modes have acceptable performances.