Abstract
The study targets uncertain coupling faults in robotic arm actuators and proposes a new fault-tolerant visual servo control strategy. Specifically, it considers both multiplicative and additive actuator faults within the dynamic of the robotic arm, treating the coupling faults and time-varying disturbances as an aggregate of concentrated uncertainties. A radial basis function neural network-based state observer is introduced to online approximate these concentrated uncertainties, which include fault information, eliminating the need for prior knowledge of faults. Furthermore, a fault-tolerant controller based on a non-singular fast terminal sliding mode is proposed, which separately decouples the nominal quantities and concentrated uncertainties and develops individual adaptive control laws for each. This effectively reduces the detrimental impact of coupled faults and disturbances on the system’s performance, facilitating image feature trajectory tracking control with minimal jitter, high precision, and strong transient response capabilities. The stability of the state observer and the fault-tolerant controller has been substantiated through Lyapunov’s theory. Lastly, numerical simulations validate the efficacy and robustness of the proposed fault-tolerant visual servo control approach.
















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The datasets during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We would like to extend our sincere gratitude to the editors and reviewers for their insightful comments and suggestions, which have significantly improved the quality of this manuscript.
Funding
This research was funded by the Natural Science Foundation of Heilongjiang Province grant number KY10400210217 and the Fundamental Strengthening Program Technical Field Fund grant number 2021-JCJQ-JJ-0026.
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Jiashuai Li contributed to the methodology, investigation, formal analysis, and writing—original draft. Xiuyan Peng was involved in the supervision and writing—review and editing. Bing Li assisted in the supervision and writing—review and editing. Victor Sreeram was involved in the supervision and writing—review and editing. Jiawei Wu contributed to the methodology, investigation, formal analysis, and writing—original draft.
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Li, J., Peng, X., Li, B. et al. Fault-tolerant visual servo control for a robotic arm with actuator faults. Neural Comput & Applic 36, 15815–15828 (2024). https://doi.org/10.1007/s00521-024-09714-x
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DOI: https://doi.org/10.1007/s00521-024-09714-x