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Related Experiment Video

Updated: Nov 10, 2025

Robotic Mirror Therapy System for Functional Recovery of Hemiplegic Arms
10:32

Robotic Mirror Therapy System for Functional Recovery of Hemiplegic Arms

Published on: August 15, 2016

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Real-time quintic Hermite interpolation for robot trajectory execution.

Morten Lind1

  • 1Production Technology, SINTEF Manufacturing, Trondheim, Trøndelag, Norway.

Peerj. Computer Science
|April 5, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a real-time robot control system using quintic Hermite splines for smoother, faster trajectory interpolation. This enables precise robot motion control, demonstrated with a Panda robot performing a cutting task.

Keywords:
InterpolationJoint controlPythonReal-timeRoboticsTrajectory

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Area of Science:

  • Robotics and Control Systems
  • Computational Geometry and Spline Interpolation
  • Real-Time Systems Engineering

Background:

  • Robot controllers often have low cycle times, limiting real-time control precision.
  • Existing trajectory planning methods may not meet the demands of high-frequency robotic operations.
  • Bridging the gap between high-level planning and low-level real-time execution is crucial for advanced robotic applications.

Purpose of the Study:

  • To develop a real-time joint trajectory interpolation system for frequency scaling robot controller cycle times.
  • To enable precise real-time robot control from Python applications at moderate cycle times.
  • To demonstrate the system's applicability for tasks requiring high-fidelity motion, such as robotic cutting.

Main Methods:

  • Real-time interpolation using quintic Hermite piece-wise splines.
  • Piecewise calculation of splines between high-level trajectory points.
  • Sampling of splines at a shorter cycle time for lower-level system requirements.
  • Tracking delay analysis using a cosine trajectory.
  • Implementation and testing on a Franka Emika Panda robot.

Main Results:

  • Successful real-time control of the Panda robot at a moderate cycle time.
  • Demonstration of a cutting task using a pre-calculated trajectory fed in real-time.
  • Quantification of tracking delay and presentation of estimated forces on the robot wrist during the cutting operation.

Conclusions:

  • The proposed real-time joint trajectory interpolation system effectively scales controller frequencies for enhanced robot control.
  • Quintic Hermite splines provide a robust method for real-time trajectory generation in robotics.
  • The system is generalizable and proven effective in a practical application involving precise manipulation.