Robust adaptive finite‐time parameter estimation and control for robotic systems

By Jing Na, Muhammad Nasiruddin Mahyuddin, Guido Herrmann, Xuemei Ren, Phil Barber. 2015

340 citations recorded by the source corpus.

This paper studies adaptive parameter estimation and control for nonlinear robotic systems based on parameter estimation errors. A framework to obtain an expression of the parameter estimation error is proposed first by introducing a set of auxiliary filtered variables. Then three novel adaptive laws driven by the estimation error are presented, where exponential error convergence is proved under the conventional persistent excitation (PE) condition; the direct measurement of the time derivatives of the system states are avoided. The adaptive laws are modified via a sliding mode technique to achieve finite‐time convergence, and an online verification of the alternative PE condition is introduced. Leakage terms, functions of the estimation error, are incorporated into the adaptation laws to avoid windup of the adaptation algorithms. The adaptive algorithm applied to robotic systems permits that tracking control and exact parameter estimation are achieved simultaneously in finite time using a terminal sliding mode (TSM) control law. In this case, the PE condition can be replaced with a sufficient richness requirement of the command signals and thus is verifiable a priori. The potential singularity problem encountered in TSM controls is remedied by introducing a two‐phase control procedure. The robustness of the proposed methods against disturbances is investigated. Simulations based on the ‘Bristol‐Elumotion‐Robotic‐Torso II’ (BERT II) are provided to validate the efficacy of the introduced methods. Copyright © 2014 John Wiley & Sons, Ltd.

Subfields: Control and Systems Engineering

View Paper: https://www.semanticscholar.org/paper/eb8e56141953e0825af806122a3fceba5c5317c0

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In Control and Systems Engineering

1. Wei He
2. Chenguang Yang
3. Zhijun Li
4. Yiming Jiang
5. Ling Xu
6. Qun Zong
7. Fang Wang
8. Jing Na

Citations in the corpus

• Adaptive Parameter Estimation and Control Design for Robot Manipulators With Finite-Time Convergence (2018, methodology): “Comparing with the Lagrange model used in [26], the NE model used in this paper is much simpler and is more computationally efficient.”
• The parameter estimation algorithms based on the dynamical response measurement data (2017, methodology): “Update the parameter estimates û(tk) using equation (33).”
• Robust adaptive backstepping control for an uncertain nonlinear system with input constraint based on Lyapunov redesign (2016, background): “SMC is one of the most efficient techniques to cope with external disturbance and parametric uncertainty [16].”