Diaphragm Ankle Actuation for Efficient Series Elastic Legged Robot Hopping

TL;DR

This paper introduces a lightweight, efficient diaphragm-based series elastic actuator (SELDA) for robotic legs, inspired by animal muscle-tendon systems, enabling improved hopping performance with adjustable height and speed.

Contribution

The design and implementation of a novel low-friction, lightweight diaphragm-based series elastic actuator (SELDA) for distal leg joints in robots.

Findings

SELDA improves hopping height by 11%.

SELDA increases forward velocity by 14%.

The actuator achieves high efficiency with low power input.

Abstract

Robots need lightweight legs for agile locomotion, and intrinsic series elastic compliance has proven to be a major ingredient for energy-efficient locomotion and robust locomotion control. Animals' anatomy and locomotion capabilities emphasize the importance of that lightweight legs and integrated, compact, series elastically actuated for distal leg joints. But unlike robots, animals achieve series elastic actuation by their muscle-tendon units. So far no designs are available that feature all characteristics of a perfect distal legged locomotion actuator; a low-weight and low-inertia design, with high mechanical efficiency, no stick and sliding friction, low mechanical complexity, high-power output while being easy to mount. Ideally, such an actuator can be controlled directly and without mechanical cross-coupling, for example remotely. With this goal in mind, we propose a low-friction, lightweight Series ELastic Diaphragm distal Actuator (SELDA) which meets many, although not all, of the above requirements. We develop, implement, and characterize a bioinspired robot leg that features a SELDA-actuated foot segment. We compare two leg configurations controlled by a central pattern generator that both feature agile forward hopping. By tuning SELDA's activation timing, we effectively adjust the robot's hopping height by 11% and its forward velocity by 14%, even with comparatively low power injection to the distal joint.