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Related Concept Videos

Support Reactions in Three Dimensions01:27

Support Reactions in Three Dimensions

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Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
Ball and Socket Joint is one of the supports allowing free rotation about any axis. This freedom of rotation is...
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Rod-based Fabrication of Customizable Soft Robotic Pneumatic Gripper Devices for Delicate Tissue Manipulation
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Bioinspired Bidirectional Stiffening Soft Actuators Enable Versatile and Robust Grasping.

Jianfeng Lin1, Jingwei Ke1, Ruikang Xiao1

  • 1School of Power and Mechanical Engineering, Wuhan University, Wuhan, China.

Soft Robotics
|February 22, 2024
PubMed
Summary

This study introduces a bioinspired bidirectional stiffening soft actuator (BISA) that enhances both bending and lateral stiffness for soft grippers. The novel design improves grasping versatility and stability across various tasks.

Keywords:
bidirectional stiffeningbioinspired actuatorsoft grippervariable stiffness

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Area of Science:

  • Robotics
  • Materials Science
  • Biomimetics

Background:

  • Soft grippers require adaptable stiffness for versatile grasping.
  • Achieving simultaneous control over bending and lateral stiffness in soft actuators remains a challenge.
  • Existing designs often compromise lateral stability when optimizing bending stiffness.

Purpose of the Study:

  • To present a novel bioinspired bidirectional stiffening soft actuator (BISA).
  • To enable compliant and stable performance in soft grippers by modulating both bending and lateral stiffness.
  • To enhance grasping versatility, capacity, and stability.

Main Methods:

  • The BISA integrates air tendon actuation (ATA) for bending stiffness modulation.
  • A bone-like structure (BLS), inspired by phalanx morphology, is used for lateral stiffness modulation.
  • The actuator's performance was tested by measuring stiffness modulation and position errors.

Main Results:

  • The ATA achieved a maximum bending stiffness of 0.7 N/mm and threefold magnification at 45° bending.
  • The BLS improved lateral stiffness by approximately 3.9 times compared to actuators without it.
  • Lateral stiffness modulation was demonstrated, with a decoupling range of 1.3 times.

Conclusions:

  • The BISA effectively modulates both bending and lateral stiffness, overcoming limitations of previous soft actuators.
  • The bioinspired design offers enhanced stability and versatility for soft grippers.
  • The developed gripper shows promise for complex grasping tasks involving multiscale, multiweight, and multimodal objects.