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Adaptive RBF Neural Network Sliding Mode Control for a DEAP Linear Actuator

Volume 13, Number 4, July 2017 - Paper 7 - pp. 400-408
DOI: 10.23940/ijpe.17.04.p7.400408

Dehui Qiua, Yu Chena, Yuan Lib

aCollege of Information Engineering, Capital Normal University, Beijing 100048, China
bSchool of Automation, Beijing Institute of Technology, Beijing, 100081, China

(Submitted on January 14, 2017; Revised on May 14, 2017; Accepted on June 17, 2017)

Abstract:

Dielectric electro-active polymer (DEAP) is a new smart material named “artificial muscles”, which has a remarkable potential in the field of biomimetic robots. However, hysteresis nonlinearity widely exists in this material, which will reduce the performance of tracking precision and system stability. To deal with this situation, a radial basis function (RBF) neural network combined with sliding mode control algorithm is presented for a second-order DEAP linear actuator. Firstly, an inverse hysteresis operator based on Prandtl-Ishlinskii (P-I) model is used to eliminate hysteresis behavior. Secondly, an adaptive RBF neural network sliding mode controller is designed to obtain high tracking accuracy and keep system stability. The proposed algorithm makes the tracking error converge to zero and keeps the system globally stable in the case of external disturbances and parameter variations. Simulation results demonstrate that the proposed controller has the superiority to a pure sliding mode controller.

 

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