منابع مشابه
Footprints of a flapping wing
Birds have to flap their wings to generate the needed thrust force, which powers them through the air. But how exactly do flapping wings create such force, and at what amplitude and frequency should they operate? These questions have been asked by many researchers. It turns out that much of the secret is hidden in the wake left behind the flapping wing. Exemplified by the study of Andersen et a...
متن کاملUnsteady aerodynamic forces of a flapping wing.
The unsteady aerodynamic forces of a model fruit fly wing in flapping motion were investigated by numerically solving the Navier-Stokes equations. The flapping motion consisted of translation and rotation [the translation velocity (u(t)) varied according to the simple harmonic function (SHF), and the rotation was confined to a short period around stroke reversal]. First, it was shown that for a...
متن کاملControl of Flapping-Wing Micro Air Vehicles
Most birds and many insects use periodic wing motion to propel themselves and maneuver. Most conventional flying machines are propelled by rotating machinery, achieve lift through rotating or fixed wings, and are controlled through the production of steady aerodynamic forces produced by rotors or movable wings. Many of the first powered flapping-wing micro air vehicles (MAVs) effectively replac...
متن کاملExperiment-Based Optimization of Flapping Wing Kinematics
Optimization of flapping wing trajectory was explored using an experimental apparatus. A scaled-up hawkmoth (Manduca sexta) wing was fabricated and mounted to a three-degree of freedom flapping mechanism. The vertical force generated during flapping was measured using a load cell and the wing path was optimized to maximize the average vertical force. The mechanism design, control, and instrumen...
متن کاملPassive Wing Rotation in Flexible Flapping Wing Aerodynamics
Insect wings are flexible. For rigid wings lift enhancing unsteady aerodynamics mechanisms, such as delayed stall via leading-edge vortices (LEVs), wake-capture, and rotational forces, characterize the lift generation of a hovering insect. We have uncovered a novel mechanism that fruit fly size insects can utilize to further increase the lift by adjusting its wing shape passively: A pair of a L...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2017
ISSN: 0022-1120,1469-7645
DOI: 10.1017/jfm.2017.173