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A modeling error-based adaptive fuzzy observer approach with input saturation analysis for robust control of affine and non-affine systems

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Abstract

In this paper, a robust control approach is applied for both MIMO/SISO affine/non-affine nonlinear systems based on a modeling error-based adaptive fuzzy observer controller, in the presence of input saturation. In the proposed scheme, non-affine nonlinear systems can be transformed to affine systems and unknown higher-order term of expansion (HOTE) that appears due to the use of this method can be estimated by an adaptive fuzzy technique. Using the modeling error between the system states observer and a serial–parallel estimator model, a modeling error-based adaptive fuzzy observer estimator is proposed that uses the modeling error as the input of fuzzy system to approximate and adaptively compensate the unknown HOTE and also the external disturbance. The proposed scheme is able to hold control performance in the presence of input saturation. An analysis of the controlled system is presented to verify the stability of the system under control. The stability of the closed-loop system is provided based on the strictly positive real condition and Lyapunov theory. The proposed approach is effectual and robust. The simulation results demonstrate the usefulness of the proposed method for both MIMO and SISO systems.

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Authors and Affiliations

  1. Department of Electrical and Robotic Engineering, Shahrood University of Technology, Shahrood, Iran

    Hesam Fallah Ghavidel

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  1. Hesam Fallah Ghavidel
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Correspondence to Hesam Fallah Ghavidel.

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Ghavidel, H.F. A modeling error-based adaptive fuzzy observer approach with input saturation analysis for robust control of affine and non-affine systems. Soft Comput 24, 1717–1735 (2020). https://doi.org/10.1007/s00500-019-03999-0

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