Abstract
Aiming at the difficult identification of fractional order Hammerstein nonlinear systems, including many identification parameters and coupling variables, unmeasurable intermediate variables, difficulty in estimating the fractional order, and low accuracy of identification algorithms, a multiple innovation Levenberg–Marquardt algorithm (MILM) hybrid identification method based on the fractional order neuro-fuzzy Hammerstein model is proposed. First, a fractional order discrete neuro-fuzzy Hammerstein system model is constructed; secondly, the neuro-fuzzy network structure and network parameters are determined based on fuzzy clustering, and the self-learning clustering algorithm is used to determine the antecedent parameters of the neuro-fuzzy network model; then the multiple innovation principle is combined with the Levenberg–Marquardt algorithm, and the MILM hybrid algorithm is used to estimate the linear module parameters and fractional order. Finally, the academic example of the fractional order Hammerstein nonlinear system and the example of a flexible manipulator are identified to prove the effectiveness of the proposed algorithm.
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This work was supported by the National Natural Science Foundation of China (Grant number 61863034) and the Autonomous Region Graduate Research and Innovation Project (Grant number XJ2019G060).
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Zhang, Q., Wang, H. & Liu, C. MILM hybrid identification method of fractional order neural-fuzzy Hammerstein model. Nonlinear Dyn 108, 2337–2351 (2022). https://doi.org/10.1007/s11071-022-07303-y
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DOI: https://doi.org/10.1007/s11071-022-07303-y