Abstract
Biology inspired inventions have been of great interest to the researcher and engineer. Biomimicry offers special insight into nature’s methods of motion control, with significance in thrust and drag control for swimming and flying lifeforms. An array of actuators designed in an artificial wing could be used to control aerodynamic effects to adjust drag or lift according to given wind conditions for improved flight, or to control stability prior to touchdown for a smooth landing, providing an additional means of aerodynamic stability control. In this study, a method of generating a travelling wave motion in attempt to mimic that observed in the wings of flying-fish (Exocoetidae) during descent are presented. Ionic polymer-metal composite actuators were arranged in an array and oscillated in a travelling wave motion. The arrays were held rigid between glass slides and embedded into a flexible substrate to create the soft “wing” surface for free-end displacement measurements. Using a microcontroller and motor drivers, a controllable travelling wave motion was created. Additionally, an array of actuators was connected to a 3D printed wing skeleton based on the dimensions of a four-wing flying-fish like structure. The results indicate the travelling wave motion can be controlled with ionic polymer-metal composite actuators as arranged in several configurations. This offers an experimental platform for further study of the aerodynamic effects of a travelling wave across a wing during flight.










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Acknowledgements
This work was supported by the Office of Naval Research (N00014-16-1-2356). Also, special thanks go to Dr. Promode R. Bandyopadhyay of US Navy NUWC NWPT for providing us with useful information about flying-fish.
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Stalbaum, T., Hwang, T., Trabia, S. et al. Bioinspired travelling wave generation in soft-robotics using ionic polymer-metal composites. Int J Intell Robot Appl 1, 167–179 (2017). https://doi.org/10.1007/s41315-017-0015-9
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DOI: https://doi.org/10.1007/s41315-017-0015-9