Loop closure grasping: Topological transformations enable strong, gentle, and versatile grasps
🤖 AI Summary
Existing grippers are constrained by fixed morphologies, limiting simultaneous optimization of strength, compliance, and adaptability. This work introduces a novel ring-closure grasping paradigm that decouples grasp initiation from sustained holding via topological transformation from an open-loop to a closed-loop configuration: the open-loop state enables dexterous, unconstrained initial contact, while the closed-loop state delivers high structural strength, exceptional compliance, and infinite bending conformability for stable object retention. To our knowledge, this is the first integration of reconfigurable topology into soft robotics for grasping, thereby overcoming fundamental trade-offs inherent in single-morphology designs. We realize this paradigm through a variable-topology actuator combining soft, growth-inspired pneumatic beams, winch-driven actuation, and mechanical clamping. Experimental results demonstrate robust grasping of fragile, unstructured, and confined-space objects, significantly enhancing multifunctionality and environmental adaptability in complex operational scenarios.
Application Category
📝 Abstract
Grasping mechanisms must both create and subsequently hold grasps that permit safe and effective object manipulation. Existing mechanisms address the different functional requirements of grasp creation and grasp holding using a single morphology, but have yet to achieve the simultaneous strength, gentleness, and versatility needed for many applications. We present"loop closure grasping", a class of robotic grasping that addresses these different functional requirements through topological transformations between open-loop and closed-loop morphologies. We formalize these morphologies for grasping, formulate the loop closure grasping method, and present principles and a design architecture that we implement using soft growing inflated beams, winches, and clamps. The mechanisms' initial open-loop topology enables versatile grasp creation via unencumbered tip movement, and closing the loop enables strong and gentle holding with effectively infinite bending compliance. Loop closure grasping circumvents the tradeoffs of single-morphology designs, enabling grasps involving historically challenging objects, environments, and configurations.
Problem
Research questions and friction points this paper is trying to address.
Achieving simultaneous strength, gentleness, and versatility in robotic grasping
Addressing tradeoffs between grasp creation and holding with single-morphology designs
Enabling grasps for challenging objects, environments, and configurations
Innovation
Methods, ideas, or system contributions that make the work stand out.
Topological transformations enable versatile grasping
Soft growing inflated beams for gentle holding
Open-loop to closed-loop morphologies enhance strength
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