Compliant Hinge Joint with PneuNets Actuator Design

This technical report presents a novel compliant hinge joint driven by PneuNets bending actuators, aimed at enhancing the load-carrying capacity and motion precision of soft robots. The document outlines the inherent challenges faced by soft pneumatic robots, particularly their limited ability to carry heavy loads and perform precise motions due to their flexibility. To address these issues, the authors propose a hinge joint that combines compliant mechanisms with PneuNets actuators. The report details the derivation of a pseudo-rigid-body model for the joint design, validated through experiments and simulations. The findings indicate that the joint can achieve a significant range of bending angles while maintaining high off-axis stiffness, which allows it to support heavy loads without sacrificing flexibility. The paper is structured to include sections on the design, analytical models, fabrication processes, and experimental evaluations, ultimately contributing to the development of high-performance soft robots by integrating various flexure mechanisms and pneumatic actuators.