Snapping Actuators with Asymmetric and Sequenced Motion

2026-02-20

AI Summary

This work addresses the challenge of achieving rapid, energy-efficient, and controllable asymmetric actuation in soft robotics by proposing a geometry-induced buckling actuator based on an eccentric dome structure. The design leverages mechanical instability to generate programmable asymmetric motion. By integrating four such actuators under a single pneumatic input, the system enables coordinated, wave-like locomotion in a quadrupedal soft robot without requiring complex control schemes. Experimental results demonstrate that the robot achieves a maximum speed of 72.78 mm/s at a driving frequency of 7.5 Hz, confirming the feasibility and advantages of the proposed approach for efficient, untethered soft actuation.

Technology Category

• Intelligent Robots: Motion and Path Planning
• Computer Vision: Low Level & Physics-based Vision
• Humans and AI: Human-Aware Planning and Behavior Prediction

Application Category

• Responsible Web: Machine-in-the-loop, human agency and autonomy
• Systems and Infrastructure for Web, Mobile and WoT: Energy management for devices in mobile Web and WoT environments
• Economics, Online Markets and Human Computation: Incentives in network design for Web infrastructures and ecosystems

Abstract

Snapping instabilities in soft structures offer a powerful pathway to achieve rapid and energy-efficient actuation. In this study, an eccentric dome-shaped snapping actuator is developed to generate controllable asymmetric motion through geometry-induced instability. Finite element simulations and experiments reveal consistent asymmetric deformation and the corresponding pressure characteristics. By coupling four snapping actuators in a pneumatic network, a compact quadrupedal robot achieves coordinated wavelike locomotion using only a single pressure input. The robot exhibits frequency-dependent performance with a maximum speed of 72.78~mm/s at 7.5~Hz. These findings demonstrate the potential of asymmetric snapping mechanisms for physically controlled actuation and lay the groundwork for fully untethered and efficient soft robotic systems.

Problem

• snapping instability
• asymmetric motion
• soft actuator
• pneumatic network
• soft robotics

Innovation

• snapping instability
• asymmetric actuation
• soft robotics
• pneumatic network
• geometry-induced deformation