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Hydraulically Coupled Dielectric Elastomer Actuators for a Bioinspired Suction Cup.

Chi Zhang1, Lei Liu1,2, Kanghui Xu2

  • 1Key Laboratory of Expressway Construction Machinery of Shaanxi Province, Chang'an University, Xi'an 710064, China.

Polymers
|October 23, 2021
PubMed
Summary

This study introduces an octopus-inspired suction cup using hydraulically coupled dielectric elastomer actuators (HCDEAs). Optimized parameters achieved a 175 mN suction force, demonstrating versatile object handling without damage.

Keywords:
bioinspireddielectric elastomerelectrically zippinghydraulically coupledsuction cup

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Area of Science:

  • Robotics and Biomimetics
  • Materials Science
  • Actuator Technology

Background:

  • Cephalopod suction cups excel at gripping diverse objects.
  • Existing artificial suction cups often lack adaptability and ease of control.
  • Dielectric elastomer actuators offer promising solutions for soft robotics.

Purpose of the Study:

  • To develop and investigate an octopus-inspired suction cup actuated by hydraulically coupled dielectric elastomer actuators (HCDEAs).
  • To analyze the influence of pre-stretch ratio and chamber angle on suction force.
  • To evaluate the suction cup's performance on various materials.

Main Methods:

  • Fabrication of an HCDEA-driven suction cup.
  • Experimental testing to determine optimal pre-stretch ratio (λp) and chamber angle (α).
  • Assessment of suction performance on different flat object materials (acrylic, CD, ceramic, aluminum).

Main Results:

  • A maximum suction force of 175 mN was achieved with λp = 1.2 and α = 23° at 3500 V.
  • Both pre-stretch ratio and chamber angle significantly impact suction forces.
  • The suction cup successfully gripped and lifted various materials without causing damage.

Conclusions:

  • The HCDEA-actuated suction cup demonstrates efficient and adaptable gripping capabilities.
  • Optimal design parameters are crucial for maximizing suction performance.
  • This technology offers potential for delicate object manipulation in robotics.