Dynamic flight stability of a bumblebee in forward flight |
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Authors: | Yan Xiong Mao Sun |
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Institution: | (1) Institute of Fluid Mechanics, Beihang University, 100083 Beijing, China |
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Abstract: | The longitudinal dynamic flight stability of a bumblebee in forward flight is studied. The method of computational fluid dynamics
is used to compute the aerodynamic derivatives and the techniques of eigenvalue and eigenvector analysis are employed for
solving the equations of motion. The primary findings are as the following. The forward flight of the bumblebee is not dynamically
stable due to the existence of one (or two) unstable or approximately neutrally stable natural modes of motion. At hovering
to medium flight speed flight speed u
e
= (0–3.5) m s−1; advance ratio J = 0–0.44], the flight is weakly unstable or approximately neutrally stable; at high speed (u
e
= 4.5 m s−1; J = 0.57), the flight becomes strongly unstable (initial disturbance double its value in only 3.5 wingbeats).
This project was supported by the National Natural Science Foundation of China (10732030). |
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Keywords: | Bumblebee Dynamic stability Forward flight Navier– Stokes simulation Natural modes of motion |
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