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Related Experiment Video

Updated: Jan 19, 2026

Mechanical Manipulation of Neurons to Control Axonal Development
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Model-free continuous nonsingular fast terminal sliding mode control for cable-driven manipulators.

Yaoyao Wang1, Kangwu Zhu2, Bai Chen1

  • 1National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

ISA Transactions
|September 14, 2019
PubMed
Summary

This study introduces a novel robust control for cable-driven manipulators, enhancing performance using a fractional sliding mode control surface and time-delay estimation for disturbance rejection. The method ensures accurate, fast, and singularity-free operation.

Keywords:
Cable-driven manipulatorsContinuous controlModel-freeNFTSMTDE

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Area of Science:

  • Robotics
  • Control Systems Engineering
  • Mechatronics

Background:

  • Cable-driven manipulators (CDMs) present unique control challenges due to their inherent nonlinear dynamics and susceptibility to external disturbances.
  • Existing control strategies often struggle to achieve high precision, speed, and singularity-free operation simultaneously, especially in the presence of uncertainties.

Purpose of the Study:

  • To develop a model-free robust control strategy for CDMs that addresses disturbances and improves dynamical control performance.
  • To design a novel non-singular fast terminal sliding mode (NFTSM) surface for enhanced accuracy and singularity avoidance.
  • To validate the proposed control scheme's effectiveness through theoretical analysis and experimental comparisons.

Main Methods:

  • Design of a new NFTSM surface incorporating a continuous terminal sliding mode (TSM)-type switch element with fractional power for error dynamics.
  • Application of the time-delay estimation (TDE) technique to cancel complex nonlinear dynamics, enabling a model-free approach.
  • Theoretical analysis of stability, control precision, and convergence speed, followed by comparative experimental validation.

Main Results:

  • The proposed NFTSM surface effectively enhances dynamical performance by utilizing fractional power in the error dynamics.
  • The TDE technique successfully cancels nonlinear dynamics, ensuring a robust model-free control scheme.
  • Experimental results demonstrate superior control precision and faster convergence speeds compared to existing methods.

Conclusions:

  • The developed model-free robust control strategy offers significant improvements in accuracy, speed, and singularity-free operation for CDMs.
  • The combination of the novel NFTSM surface and TDE provides a highly effective solution for controlling CDMs under disturbance.
  • The proposed control method is validated to outperform existing approaches in terms of comprehensive control performance.