ON RESIDUAL GENERATION BY OBSERVER AND PARITY SPACE APPROACHES

A unifying framework for observer design by eigenstructure assignment is described. A new technique for structured residual generation, base d on this framework, is proposed. One of the main features of this tec hnique is that the equivalence between residual generation by means of observers or parity space devices are made conspicuous. More precisel y, from a computational point of view, the equations to solve in both cases are shown to be similar, and for implementation, both devices ar e shown to be identical. A necessary and sufficient condition for the existence of structured residuals is given. Finally the sensitivity of structured residuals to nondecoupled failures is studied and a proced ure for maximizing this sensitivity is described.