A New Observer Design for the Joint Estimation of States and Unknown Inputs for a Class of Nonlinear Fractional-Order Systems

Chenchen Peng (), Haiyi Yang, Anqing Yang and Ling Ren
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Chenchen Peng: School of Information and Control Engineering, Qingdao University of Technology, Qingdao 266520, China
Haiyi Yang: School of Information and Control Engineering, Qingdao University of Technology, Qingdao 266520, China
Anqing Yang: School of Information Engineering, Shandong Management University, Jinan 250357, China
Ling Ren: School of Information and Control Engineering, Qingdao University of Technology, Qingdao 266520, China

Mathematics, 2024, vol. 12, issue 8, 1-12

Abstract: This article designs an observer for the joint estimation of the state and the unknown input for a class of nonlinear fractional-order systems (FOSs) such that one portion satisfies the Lipschitz condition and the other does not necessarily satisfy such a condition. Firstly, by reconstructing system dynamics, the observer design is transformed equivalently into the tracking problem between the original nonlinear FOSs and the designed observer. Secondly, the parameterized matrices of the desired observer are derived by use of the property of the generalized inverse matrices and the linear matrix inequality (LMI) technique combined with the Schur complement lemma. Moreover, an algorithm is presented to determine the desired observer for the nonlinear FOSs effectively. Finally, a numerical example is reported to verify the correctness and efficiency of the proposed algorithm.

Keywords: nonlinear fractional-order systems (FOSs); observer design; joint estimation of states and unknown inputs (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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