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Dynamics of electrohydraulic soft actuators.

Philipp Rothemund1, Sophie Kirkman2, Christoph Keplinger1,3

  • 1Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309; philipp.rothemund@colorado.edu christoph.keplinger@colorado.edu.

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PubMed
Summary

Researchers explored the physics of electrohydraulic soft actuators, discovering two dynamic regimes. This work enables faster, bio-inspired robots by understanding actuation speed influenced by viscosity and inertia.

Keywords:
dynamicselectrohydraulic actuatormodelingscaling analysissoft robotics

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Area of Science:

  • Robotics and Mechanical Engineering
  • Soft Matter Physics
  • Biomimetic Design

Background:

  • Soft actuators inspired by nature enable robots to handle delicate objects and navigate complex environments, surpassing traditional rigid robots.
  • Electrohydraulic soft actuators offer high force, strain, and frequency (100 Hz), but their underlying dynamics remain poorly understood.

Purpose of the Study:

  • To investigate the fundamental physics governing the dynamics of electrohydraulic soft actuators.
  • To model and understand the actuation speed limitations and possibilities in these devices.

Main Methods:

  • Experimental analysis of the Peano-HASEL (hydraulically amplified self-healing electrostatic) actuator.
  • Development of a scaling analysis to identify distinct dynamic regimes.
  • Derivation of timescales and a dynamic model for actuator behavior.

Main Results:

  • Identified two distinct dynamic regimes: viscous dissipation-limited and inertia-governed.
  • Derived timescales quantifying the impact of geometry, materials, and external loads on actuation speed.
  • Developed a model applicable to both dynamic regimes for Peano-HASEL actuators.

Conclusions:

  • The study reveals key physical principles governing electrohydraulic actuator dynamics.
  • Understanding these regimes allows for the design of faster, bio-inspired robots by optimizing for the inertial regime.
  • Findings are generalizable to other electrohydraulic actuators, advancing soft robotics capabilities.