A Sea-Anemone-Inspired, Multifunctional, Bistable Gripper

Area of Science:

• Robotics
• Biomimetics
• Materials Science

Background:

• Soft robots require enhanced multifunctionality for autonomous operation in unpredictable environments.
• Integrating sensing and actuation is key for advanced soft robotic grippers.
• Sea anemones offer a biomimetic model for efficient prey detection and capture through coupled sensing and actuation.

Purpose of the Study:

• To develop a multifunctional soft robotic gripper inspired by sea anemone body structures.
• To integrate proprioceptive and exteroceptive sensing with multimodal gripping (grasping and pinching) capabilities.
• To demonstrate a compact, universal gripper design with efficient multifunctionality.

Main Methods:

• Designed a bistable gripper utilizing a dome membrane with external tapered pins for gripping and internal markers for optical sensing.
• Leveraged the membrane's bistable nature (natural and retracted states) and snap-through behavior for actuation.
• Employed an embedded camera to analyze marker distribution for sophisticated sensing.
• Characterized gripping and sensing functions independently before integrating them into an object handling system.

Main Results:

• Successfully developed a bistable soft robotic gripper capable of both grasping and pinching.
• Demonstrated integrated proprioceptive and exteroceptive sensing through optical marker analysis.
• Validated the gripper's functionality in an object handling system, showcasing potential for advanced applications.
• Achieved an efficient and elegant integration of sensing and actuation in a compact design.

Conclusions:

• The developed bistable gripper offers a novel approach to soft robotics, inspired by natural systems.
• The integrated sensing and gripping functionalities enable adaptive and autonomous operation.
• This compact, universal design holds significant potential for diverse robotic applications requiring enhanced dexterity and perception.