RoboKrill : a metachronal drag-based swimmer robot
This work addresses the problem of exploring complex marine environments for oceanographers and engineers, but it appears incremental as it builds on existing bio-inspired robotic concepts without claiming major breakthroughs.
The researchers tackled the challenge of creating a highly maneuverable underwater robot by designing a krill-inspired, metachronal, drag-based robotic system, resulting in a compact and reproducible platform that replicates the swimming kinematics of Euphausia superba. They validated the design using active and passive actuation with 3D printed parts, though no concrete performance numbers were provided.
Marine exploration is essential to understanding ocean processes and organisms. While the use of current unmanned underwater vehicles has enabled many discoveries, there are still plenty of limitations toward exploring complex environments. Bio-inspired robots are a promising solution for highly maneuverable underwater swimming at moderate speeds. Krill, especially, are efficient swimmers in the intermediate Reynolds number regime and can inform engineering solutions for ocean exploration. In this paper, we present the design, manufacture, and validation of a new krill-inspired, metachronal, drag-based robotic system. By combining active and passive actuation of the joints with 3D printed parts, our unique design recreates the swimming kinematics of Euphausia superba in a compact and reproducible robotic platform. The motion of the anterior and posterior appendage segments is achieved using servo motors and a multi-link mechanism, while the out-of-plane motion of the biramous distal segments is attained via fluid-structure interactions. Going forward, our platform will be leveraged to study metachronal, drag-based swimmers across taxa to identify unifying success mechanisms at different scales, facilitating the development of a new generation of underwater robots.