Geometry-based pneumatic actuators for soft robotics

2026-02-27

AI Summary

This work addresses the design limitations of soft pneumatic actuators in achieving complex actuation behaviors such as near-zero bending radii, multistability, and structural stability. The authors propose geometry-based pneumatic actuators (GPAs) fabricated via CNC heat-sealing to create configurable constraint-layer chambers. By integrating a mathematical model that characterizes linear angular response and nonlinear torque–angle relationships, the approach enables predictable, customizable, and repeatable actuation profiles. The resulting reconfigurable soft robotic platform demonstrates significant performance enhancements across diverse applications: a 49-gram wrist exoskeleton reducing electromyographic activity by 51%, a 30.8-gram haptic interface delivering 8 N of force feedback, and a 208-gram bipedal robot capable of multimodal locomotion. These results validate the method’s capacity to advance both functional versatility and actuation efficacy in soft robotics.

Technology Category

• Intelligent Robots: Multimodal Perception & Sensor Fusion
• Humans and AI: Human-Aware Planning and Behavior Prediction
• Planning, Routing, and Scheduling: Activity and Plan Recognition

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Experiences and lessons learnt from Web-based algorithms and system deployments
• Responsible Web: Machine-in-the-loop, human agency and autonomy
• Graph Algorithms and Modeling for the Web: Efficient manipulation of static and dynamic Web-related graphs

Abstract

Soft pneumatic actuators enable safe human-machine interaction with lightweight and powerful applied parts. On the other side, they suffer design limitations as regards complex actuation patterns, including minimum bending radii, multi-states capabilities and structural stability. We present geometry-based pneumatic actuators (GPAs), a design and implementation approach that introduces constraint layers with configurable CNC heat-sealed chambers. The approach achieves predictable deformation, near-zero bending radii, multi-states actuation, and enables customizable and repeatable complex actuated geometries. Mathematical modeling reveals predictable linear angle transformations and validates nonlinear torque-angle relationships across diverse configurations. We demonstrate versatility of the GPAs approach through three applications: a 49 g wrist exoskeleton reducing muscle activity by up to 51%, a 30.8 g haptic interface delivering 8 N force feedback with fast response, and a 208 g bipedal robot achieving multi-gait locomotion. GPAs establish a configurable platform for next-generation wearable robotics, haptic systems, and soft locomotion devices.

Problem

• soft pneumatic actuators
• complex actuation patterns
• minimum bending radii
• multi-states capabilities
• structural stability

Innovation

• geometry-based pneumatic actuators
• constraint layers
• multi-states actuation
• predictable deformation
• soft robotics