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A Novel Pneudraulic Actuation Method to Enhance Soft Robot Control.

Dionysios Malas1,2, Shuai Wang2, Wei Huang2

  • 1Department of Surgical & Interventional Engineering, School of Biomedical Engineering & Imaging Sciences, King's College London (KCL), London, UK.

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|December 26, 2024
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Summary

A novel pneudraulic actuation system for soft fluidic actuators (SFAs) enhances speed and reduces noise. This combined pneumatic and hydraulic approach offers improved performance for medical robotics and industrial applications.

Keywords:
actuationcontroldynamic controlhybrid actuationhydraulicspneumaticssoft fluidic actuatorssoft robotics

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Area of Science:

  • Robotics and Mechanical Engineering
  • Fluid Dynamics
  • Control Systems

Background:

  • Soft fluidic actuators (SFAs) are crucial for medical robotics, offering safer human-robot interaction than rigid devices.
  • Traditional pneumatic and hydraulic actuation methods for SFAs have limitations in speed, precision, and complexity.
  • There is a need for advanced actuation systems to enhance SFA performance in industrial and medical applications.

Purpose of the Study:

  • To introduce and evaluate a novel pneudraulic actuation system for SFAs, combining pneumatic and hydraulic circuits in series.
  • To compare the performance of the proposed pneudraulic system against conventional actuation methods.
  • To develop and implement a model-based control strategy for optimizing SFA dynamic behavior.

Main Methods:

  • A comparative assessment of bending performance and audible noise levels for different fluidic actuation techniques.
  • Analysis of fluid-structure interactions and the impact of trapped air in SFAs.
  • Investigation of fluidic circuit parameters (tubing dimensions, fluid medium) on system dynamics.
  • Development of a model-based PID controller using hydraulic-electric analogy and circuit theory.

Main Results:

  • The proposed pneudraulic system demonstrated significant improvements in actuation speed and reduced audible noise.
  • The PID controller enhanced actuation speed by 52.63% and reduced noise by 17.17%.
  • Fluid mechanics and circuit design parameters were shown to critically impact SFA dynamic behavior.

Conclusions:

  • The novel series pneudraulic actuation system offers a promising solution for enhancing SFA performance.
  • Model-based control focusing on fluid dynamics can effectively optimize SFA speed and noise levels.
  • This research highlights the importance of fluid mechanics in designing advanced soft actuators for demanding applications.