TY - JOUR ID - 4512 TI - Robust adaptive sliding mode admittance control of exoskeleton rehabilitation robots JO - Scientia Iranica JA - SCI LA - en SN - 1026-3098 AU - Torabi, Mansour AU - Sharifi, Mojtaba AU - Vossoughi, Gholamreza AD - School of Mechanical Engineering, Sharif University of Technology, Azadi Avenue, P.O. Box 11155-9567, Tehran, Iran AD - Department of Mechanical Engineering, Shiraz University, Shiraz 71936, Iran Y1 - 2018 PY - 2018 VL - 25 IS - 5 SP - 2628 EP - 2642 KW - Nonlinear robust adaptive control KW - adaptive gain SMC KW - admittance control KW - Rehabilitation KW - exoskeleton robot DO - 10.24200/sci.2017.4512 N2 - A nonlinear robust adaptive sliding mode admittance controller is proposed for exoskeleton rehabilitation robots. The proposed controller has robustness against uncertainties of dynamic parameters using an adaptation law. Furthermore, an adaptive Sliding Mode Control (SMC) scheme is employed in the control law to provide robustness against disturbances (non-parametric uncertainties) with unknown bounds. For this purpose, another adaptation law is defined for the variation of the SMC gain. The proposed scheme is augmented with an admittance control method to provide compliance for the patient during interaction with the rehabilitation robot. The stability of the proposed controller and the tracking performance of the system are proven using the Lyapunov stability theorem. To verify the effectiveness of the proposed control method, some simulations are conducted for a nonlinear lower-limb exoskeleton robot interacting with a patient leg via some braces. Based on the obtained results, the controller is able to provide a flexibility for the patient and appropriately respond to his/her non-compliant interaction torques. Moreover, the proposed controller significantly reduces the chattering of the input torques in comparison with a previous adaptive control method with a constant SMC gain, while it maintains a similar tracking performance.  UR - https://scientiairanica.sharif.edu/article_4512.html L1 - https://scientiairanica.sharif.edu/article_4512_89053b0d834815225a68259b8ab4a629.pdf ER -