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Extended state observer based robust sliding mode control for fourth order nonlinear systems with experimental validation

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Abstract

It is commonly known that the design of control is difficult for the systems with non-minimum phase behavior, the coupling between the controlled variables and integral instability. The paper presents such a typical class of nonlinear system and propose a new technique generalized extended state observer-based sliding mode decoupling control. The proposed control algorithm is also able to compensate for the matched and mismatched uncertainties encountered in such nonlinear non-minimum phase systems. The decoupling control approach is used to decouple the entire system framework into subsystems. The sliding surface of the individual subsystem was composed using the estimated states of GESO. The proposed technique can nullify the effect of external disturbances, parametric uncertainties and unmodelled dynamics due to the inclusion of disturbance compensation gain in the control law. The proposed methodology enables the system to accomplish asymptotic stability and better dynamic response with lesser IAE and ITAE values than existing decoupling control strategies. An experimental application of the proposed technique to Quanser’s rotary pendulum module is investigated.

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Authors and Affiliations

  1. Research Scholar at Departmment of Instrumentation Engineering, SGGS Institute of Engineering and Technology, Nanded, 431606, Maharashtra, India

    Sushant N. Pawar

  2. Ramrao Adik Institute of Technology, Nerul, NaviMumbai, 400706, Maharashtra, India

    Sushant N. Pawar

  3. Professor at Departmment of Instrumentation Engineering, SGGS Institute of Engineering and Technology, Nanded, Maharashtra, 431606, India

    R. H. Chile & B. M. Patre

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  1. Sushant N. Pawar
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  2. R. H. Chile
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  3. B. M. Patre
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Correspondence to Sushant N. Pawar.

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Pawar, S.N., Chile, R.H. & Patre, B.M. Extended state observer based robust sliding mode control for fourth order nonlinear systems with experimental validation. Int. J. Dynam. Control 9, 1600–1611 (2021). https://doi.org/10.1007/s40435-020-00743-7

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  • DOI: https://doi.org/10.1007/s40435-020-00743-7

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