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Biomimetic flexible plate actuators are faster and more efficient with a passive attachment

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Abstract

Using three-dimensional computer simulations, we probe biomimetic free swimming of an internally actuated flexible plate in the regime near the first natural frequency. The plate is driven by an oscillating internal moment approximating the actuation mechanism of a piezoelectric macro fiber composite (MFC) bimorph. We show in our simulations that the addition of a passive attachment increases both swimming velocity and efficiency. Specifically, if the active and passive sections are of similar size, the overall performance is the best. We determine that this optimum is a result of two competing factors. If the passive section is too large, then the actuated portion is unable to generate substantial deflection to create sufficient thrust. On the other hand, a large actuated section leads to a bending pattern that is inefficient at generating thrust especially at higher frequencies.

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Acknowledgments

The authors would like to thank L. Cen and A. Erturk for the stimulating and insightful discussions.

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  1. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, USA

    Peter D. Yeh & Alexander Alexeev

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  1. Peter D. Yeh
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Correspondence to Alexander Alexeev.

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Yeh, P.D., Alexeev, A. Biomimetic flexible plate actuators are faster and more efficient with a passive attachment. Acta Mech. Sin. 32, 1001–1011 (2016). https://doi.org/10.1007/s10409-016-0592-0

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