JRM Vol.34 No.2 pp. 223-226
doi: 10.20965/jrm.2022.p0223


Biomimetic Soft Wings for Soft Robot Science

Hiroto Tanaka*, Toshiyuki Nakata**, and Takeshi Yamasaki***

*Tokyo Institute of Technology
2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

**Chiba University
1-33 Yayoi-cho, Inage-ku, Chiba-shi, Chiba 263-8522, Japan

***Yamashina Institute for Ornithology
115 Konoyama, Abiko-shi, Chiba 270-1145, Japan

September 17, 2021
January 10, 2022
April 20, 2022
flapping wing, flexible wing, hummingbird, penguin, fluid-structure interaction
Biomimetic Soft Wings for Soft Robot Science

Flapping-wing robot with elastic parts

Flight and swimming in nature can inspire the design of highly adaptive robots capable of working in complex environments. In this letter, we reviewed our work on robotic propulsion in the air and water, with a specific focus on the crucial functions of elastic components involved in the driving mechanism and flapping wings. Elasticity in the driving mechanism inspired by birds and insects can enhance both the aerodynamic efficiency of flapping wings and robustness against disturbances with appropriate design. A flapping wing surface with a stiffness distribution inspired by hummingbirds was fabricated by combining tapered spars and ribs with a thin film. The biomimetic flexible wing could generate more lift than the nontapered wing with a similar amount of power consumption. Underwater flapping-wing propulsion inspired by penguins was investigated by combining the 3-degree-of-freedom (DoF) flapping mechanism and hydrodynamic calculation, which indicates that wing bending increases the propulsion efficiency. This work demonstrates the importance of passive deformation of both wing surfaces and driving mechanisms for improving the fluid dynamic efficiency and robustness in flight and swimming, as well as providing biological insight from an engineering perspective.

Cite this article as:
Hiroto Tanaka, Toshiyuki Nakata, and Takeshi Yamasaki, “Biomimetic Soft Wings for Soft Robot Science,” J. Robot. Mechatron., Vol.34, No.2, pp. 223-226, 2022.
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Last updated on May. 20, 2022