Observer Sliding Mode Control Design for lower Exoskeleton system: Rehabilitation Case

Nasir Ahmed Alawad, Amjad J. Humaidi, Ahmed Sabah Alaraji

Abstract


Sliding mode (SM) has been selected as the controlling technique, and the state observer (SO) design is used as a component of active disturbance rejection control (ADRC) to reduce the knee position trajectory for therapeutic purposes. The suggested controller will improve the needed position performances for the Exoskeleton system when compared to the proportional-derivative controller (PD) and SMC as feed-forward in the ADRC approach, as shown theoretically and through computer simulations. Simulink tool is used in this comparison to analyze the nominal case and several disruption cases. The results of mathematical modeling and simulation studies demonstrated that SMC with a disturbance observer strategy performs better than the PD control system and SMC in feed-forward with a greater capacity to reject disturbances and significantly better than these controllers. Performance indices are used for numerical comparison to demonstrate the superiority of these controllers.


Keywords


Exoskeleton system; ADRC; robustness; disturbance rejection, SMC.

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References


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DOI: https://doi.org/10.18196/jrc.v3i4.15239

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