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Effects of Phase Relation between Forewing and Hindwing on Aerodynamic Performance in Dragonfly Flight

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Abstract:

Dragonflies possess one of the most maneuverable flights among various insects. As the bionic Micro Air vehicles (MAVs) with the flight capabilities like dragonflies have been widely applied, detailed studies of dragonfly flight become critical and necessary for improvement and accomplishment of MAVs design. The phase relation between the forewings and hindwings is the most distinct feature of dragonfly flight and it plays an important role in the aerodynamic performance. In this paper, both tethered and quasi-free flapping flight of the dragonfly Pantala flavescens was filmed using a high-speed camera in indoor laboratory. Dragonflies tend to flap in-phase when an additional force is expected, while out-of-phase flapping is conducive to the stability and control of flight. In the takeoff maneuver, the large-and small-amplitude wingbeat alternated. Dragonflies obtain a high acceleration rapidly by the suddenly enlarged wingbeat amplitude which increases by 42%, and maintain the velocity and make ready for following acceleration by the small-amplitude but high-frequency wingbeat with amplitude decreases by 51% and frequency increases by 30% relatively.

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Info:

Periodical:

Applied Mechanics and Materials (Volume 709)

Pages:

245-251

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.709.245

Citation:

Cite this paper

Online since:

December 2014

Authors:

Jin Zhao Yan*, Meng Zong Zheng, Zhi Ping Li, Qiu Shi Li

Keywords:

Aerodynamic Performance, Dragonfly Flight, Flapping, Phase Relation

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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