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• W3135884685 abstract "Abstract This article presents a new observer design framework for a class of nonlinear descriptor systems with unknown but bounded inputs. In the presence of unmeasured nonlinearities, that is, premise variables, designing nonlinear observers is known as particularly challenging. To solve this problem, we rewrite the nonlinear descriptor system in the form of a Takagi–Sugeno (TS) fuzzy model with nonlinear consequents. This model reformulation enables an effective use of the differential mean value theorem to deal with the mismatching terms involved in the estimation error dynamics. These nonlinear terms, issued from the unmeasured nonlinearities of the descriptor system, cause a major technical difficulty for TS fuzzy‐model‐based observer design. The descriptor form is treated through a singular redundancy representation. For observer design, we introduce into the Luenberger‐like observer structure a virtual variable aiming at estimating the one‐step ahead state. This variable introduction allows for free‐structure decision variables involved in the observer design to further reduce the conservatism. Using Lyapunov‐based arguments, the observer design is reformulated as an optimization problem under linear matrix inequalities with a single line search parameter. The estimation error bounds of both the state and the unknown input can be minimized by means of a guaranteed ℓ ∞ ‐gain performance level. The interests of the new ℓ ∞ TS fuzzy observer design are clearly illustrated with two physically motivated examples." @default.
• W3135884685 created "2021-03-15" @default.
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• W3135884685 date "2021-03-02" @default.
• W3135884685 modified "2023-10-09" @default.
• W3135884685 title "Takagi–Sugeno fuzzy observer design for nonlinear descriptor systems with unmeasured premise variables and unknown inputs" @default.
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• W3135884685 doi "https://doi.org/10.1002/rnc.5453" @default.
• W3135884685 hasPublicationYear "2021" @default.
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