Supplementary material from "Power requirements for bat-inspired flapping flight with heavy, highly articulated and cambered wings"

Posted on 15.09.2022 - 12:01
Bats fly with highly articulated and heavy wings. To understand their power requirements, we develop a three-dimensional reduced-order model, and apply it to flights of Cynopterus brachyotis, the lesser dog-faced fruit bat. Using previously measured wing kinematics, the model computes aerodynamic forces using blade element momentum theory, and incorporates inertial forces of the flapping wing using the measured mass distribution of the membrane wing and body. The two are combined into a Lagrangian equation of motion, and we performed Monte Carlo simulations to address uncertainties in measurement errors and modelling assumptions. We find that the camber of the armwing decreases with flight speed whereas the handwing camber is more independent of speed. Wing camber disproportionately impacts energetics, mainly during the downstroke, and increases the power requirement from 8% to 22% over flight speed U = 3.2−1

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Fan, Xiaozhou; Swartz, Sharon; Breuer, Kenneth (2022): Supplementary material from "Power requirements for bat-inspired flapping flight with heavy, highly articulated and cambered wings". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.6181102.v2
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