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PD Controller: Design01:26

PD Controller: Design

233
In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
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Safe Supervisory Control of Soft Robot Actuators.

Andrew P Sabelhaus1, Zach J Patterson2, Anthony T Wertz3

  • 1Department of Mechanical Engineering, Boston University, Boston, Massachusetts, USA.

Soft Robotics
|February 7, 2024
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Summary

This study introduces a supervisory controller for safe soft robot operation. It prevents actuator damage during unmodeled contact and infeasible motions, enhancing reliability for practical applications.

Keywords:
control systemssafetyshape memory alloysoft actuators

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Area of Science:

  • Robotics
  • Materials Science

Background:

  • Soft robots offer safer human interaction but are prone to actuator damage from unmodeled contact.
  • Existing control strategies lack robust protection against physical degradation of soft actuators.

Purpose of the Study:

  • To develop and validate a feedback strategy for safe operation of soft robot actuators.
  • To enhance the reliability and practical usability of soft robotic systems.

Main Methods:

  • Implemented a supervisory controller to monitor actuator states and dynamically limit control inputs.
  • Utilized a soft thermally actuated robot limb with embedded shape memory alloy actuators and sensing for onboard demonstration.
  • Provided theoretical stability and safety proofs for the supervisory controller under specific conditions.

Main Results:

  • Demonstrated completely onboard operation of the supervisory controller.
  • Verified theoretical properties and showed stabilization of the robot limb's pose.
  • Prevented actuator overheating during contact scenarios and when commanded infeasible motions.

Conclusions:

  • The developed supervisory controller ensures actuator safety and stability in soft robots.
  • Onboard execution capability makes the system suitable for real-world applications.
  • This approach significantly improves the reliability of soft robot actuators for practical deployment.