Magnet-Activated 3D Printed Wings Replicate Monarch Butterfly Flight

Researchers at the Technical University of Darmstadt and the Helmholtz Center Dresden-Rossendorf have developed robotic wings inspired by the structure and flight dynamics of the monarch butterfly. Using 3D printing, they created wings that operate without batteries and with a passive bending system to generate efficient motion. According to the researchers, some of the applications for these flexible robots include environmental research, search and rescue operations and medical applications.

The wings of real butterflies have great strength and flight efficiency. Monarch butterflies, which inspired this research, travel thousands of miles each year between Mexico and Canada, demonstrating great energetic and mechanical efficiency. This motivated the researchers to take these characteristics, using a 3D printed replica of the wing structure, and integrate them into a new robotic device. The flapping of the 3D robotic wings is activated when they are exposed to a magnetic field because they are printed with a thermoplastic polyurethane composite and microscopic magnetic particles.

The fluttering of the 3D robotic butterflies is activated when exposed to a magnetic field (Credits: screenshot of the demonstration video, Technical University of Darmstadt).

The team, led by Professor Oliver Gutfleisch and Dr. Denys Makarov, fabricated twelve wing models. Although different structures were replicated, the ones that showed the best results were the venous structures inspired by monarch butterflies. Through finite element analysis simulations and experimentation, the researchers evaluated the influence of these patterns on the aerodynamics and maneuverability of the wings. The results, published in Advanced Intelligent Systems, indicate that designs with veined structures improve material strength and adaptability without compromising flexibility. To replicate such a design, the models were printed using laser powder bed fusion (L-PBF).