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Shared control effectively mitigates communication delay in telerobotics. This predictive human-robot control (PHRC) modality balances accuracy, task time, and user control for optimal performance.

Keywords:
bayesian predictorcommunication delayhuman-robot collaborationshared controlteleoperation

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Area of Science:

  • Robotics
  • Human-Computer Interaction
  • Control Systems

Background:

  • Communication delay is a fundamental challenge in telerobotics, impacting robot stability and user task awareness.
  • Existing solutions often involve statistical models or neural networks (NN) for sensor prediction to maintain user control.
  • Shared control offers a promising approach to enhance precision and speed in teleoperated tasks, particularly in medical and surgical applications.

Purpose of the Study:

  • To investigate the efficacy of shared control in compensating for communication delay in telerobotic systems.
  • To analyze the impact of varying degrees of autonomy on task performance under delayed communication.
  • To propose and evaluate a novel unilateral teleoperated leader-follower architecture integrating predictive systems and shared control.

Main Methods:

  • A 1-dimensional reaching and recognition task with haptic sensing was designed.
  • Four control modalities were implemented: non-predictive human control (HC), predictive human control (PHC), predictive human-robot control (PHRC), and predictive robot control (PRC).
  • The effects of added communication delay on user performance, environmental interaction forces, and trajectories were analyzed across modalities.

Main Results:

  • Non-predictive human control (HC) was highly sensitive to delay, leading to instability and oscillations.
  • Increased autonomy, particularly with shared control, effectively reduced task completion time.
  • The predictive human-robot control (PHRC) modality demonstrated optimal performance, achieving a balance between accuracy, task time, speed, and interaction forces.

Conclusions:

  • Shared control is a viable strategy for mitigating the adverse effects of communication delay in telerobotics.
  • The proposed PHRC modality offers a robust solution, enhancing performance in terms of accuracy and efficiency.
  • The study highlights the importance of intelligent control strategies in overcoming limitations in teleoperated systems.