Reliability monitoring of fault tolerant control systems with demonstration on an aircraft model

Abstract

This paper proposes a reliability monitoring scheme for active fault tolerant controlsystems using a stochastic modeling method. The reliability index is defined based onsystem dynamical responses and a safety region; the plant and controller are assumed tohave a multiple regime model structure, and a semi-Markov model is built for reliabilityevaluation based on the safety behavior of each regime model estimated by using MonteCarlo simulation. Moreover, the history data of fault detection and isolation decisions isused to update its transition characteristics and reliability model. This method provides anup-to-date reliability index as demonstrated on an aircraft model.