Abstract
“Perfect unknown input decoupling” is used to describe those residual generators, which deliver a residual signal perfectly decoupled from the unknown inputs in the process under consideration and thus are also called unknown input residual generators. In Chap. 6, the existence conditions for such kind of residual generators are first studied. It is followed by a comprehensive study on designing unknown input residual generators. The major design schemes are: UIFDF (unknown input FDF), UIDO (unknown input DO), and UIPA (unknown input PA). For the design purpose, different control theoretical and mathematical methods are applied, including eigenstructure assignment approach, geometric approach, unknown input observer theory, matrix pencil approach.
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