Grip as Needed, Glide on Demand: Ultrasonic Lubrication for Robotic Locomotion
🤖 AI Summary
This work proposes a novel approach to robotic locomotion by introducing ultrasonic lubrication as an active friction control mechanism, challenging the conventional view of friction as a passive property dictated solely by material and surface characteristics. By actuating resonant structures to dynamically switch contact interfaces between “gripping” and “sliding” states, the system enables efficient bidirectional biomimetic motion. Cylindrical and planar friction-control modules were integrated into inchworm-inspired and parasitic-wasp-ovipositor-inspired robots, respectively, achieving over 90% locomotion efficiency across diverse dry and wet substrates—including rigid, soft, granular, and biological tissues. This strategy not only significantly enhances performance and environmental adaptability but also simplifies mechanical design, demonstrating broad applicability and substantial innovation in robotic friction management.
Application Category
📝 Abstract
Friction is the essential mediator of terrestrial locomotion, yet in robotic systems it is almost always treated as a passive property fixed by surface materials and conditions. Here, we introduce ultrasonic lubrication as a method to actively control friction in robotic locomotion. By exciting resonant structures at ultrasonic frequencies, contact interfaces can dynamically switch between "grip" and "slip" states, enabling locomotion. We developed two friction control modules, a cylindrical design for lumen-like environments and a flat-plate design for external surfaces, and integrated them into bio-inspired systems modeled after inchworm and wasp ovipositor locomotion. Both systems achieved bidirectional locomotion with nearly perfect locomotion efficiencies that exceeded 90%. Friction characterization experiments further demonstrated substantial friction reduction across various surfaces, including rigid, soft, granular, and biological tissue interfaces, under dry and wet conditions, and on surfaces with different levels of roughness, confirming the broad applicability of ultrasonic lubrication to locomotion tasks. These findings establish ultrasonic lubrication as a viable active friction control mechanism for robotic locomotion, with the potential to reduce design complexity and improve efficiency of robotic locomotion systems.
Problem
Research questions and friction points this paper is trying to address.
friction control
robotic locomotion
ultrasonic lubrication
active friction
terrestrial locomotion
Innovation
Methods, ideas, or system contributions that make the work stand out.
ultrasonic lubrication
active friction control
robotic locomotion
bio-inspired robotics
resonant actuation
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