Results 201 to 210 of about 5,748 (245)

Analysis of Biplane Flapping Flight with Tail

42nd AIAA Fluid Dynamics Conference and Exhibit, 2012
Numerical simulations have been performed to examine the interference effects between an upstream flapping biplane airfoil arrangement and a downstream stationary tail at a Reynolds number of 1000, which is around the regime of small flapping micro aerial vehicles.
Tay, W.B. (author), Bijl, H. (author), Van Oudheusden, B.W. (author)   +2 more
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Propulsion efficiency of flapping flight robots

2017 IEEE International Conference on Cybernetics and Intelligent Systems (CIS) and IEEE Conference on Robotics, Automation and Mechatronics (RAM), 2017
Flapping wing technologies have been successfully applied to robots either flying in the air or gliding through the water owing to the unique advantages of flapping flight under small Re conditions. Propulsion efficiency of flapping-twisting compound motion wings are analyzed in the present study.
Longfei Zhao, Yaoxing Shang, Zongxia Jiao   +2 more
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Reconstruction of Flight Parameters of a Bat for Flapping Robots

Journal of Biomechanical Engineering, 2022
Abstract The flight of bats is comparatively less documented and understood than birds and insects and may provide novel inspiration for the design of flapping flight robots. This study captured the natural flight of short-nosed fruit bats (Cynopterus sphinx) by an optical motion capture system, “OptiTrack”, with pasted markers on the ...
Sudeep Kumar, Singh, Li-Biao, Zhang, Jing-Shan, Zhao   +2 more
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Dragonfly Flight : II. Velocities, Accelerations and Kinematics of Flapping Flight

Journal of Experimental Biology, 1997
ABSTRACT The free flapping flight of the dragonfly Sympetrum sanguineum and the damselfly Calopteryx splendens was filmed in a large flight enclosure at 3000 frames s−1. The wingtip kinematics are described for these flights. Despite the two species being similar in size, the damselfly flew with wingbeat frequencies half those of the ...
JM, Wakeling, CP, Ellington
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Optimization of Flap-Bounding Flight

AIAA Atmospheric Flight Mechanics Conference, 2011
Flap-bounding flight which is a flight mode consisting of continually repeated cycles with flapping and non-flapping phases is treated as a periodic optimal control problem. Two modelings of flap-bounding flight are developed. One modeling is based on energy considerations.
Gottfried Sachs, Jakob Lenz, Florian Holzapfel   +2 more
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The Problem of Flapping Flight

Aeronautical journal (London, England : 1897), 1921
It is only within the last few decades that it has been possible to conceive of a flying machine operating on the flapping system which would be consistent with mechanical principles. The development of gliding or “ wedge ” flight through the medium of the screw-propelled aeroplane has largely contributed to this result, but it must not be overlooked ...
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Aerodynamics of Flapping Flight With Application to Insects

Journal of Experimental Biology, 1951
ABSTRACT General formulae are derived giving the lift, thrust and power when the wing motion is specified. The formulae are applied to twenty-five insects for which quantitative data are available. Average values for lift and drag coefficients, CL and CD, are derived by equating the weight to the vertical force and the thrust to the ...
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Flapping Flight of the Andean Condor in Nature

Journal of Experimental Biology, 1973
ABSTRACT At air speeds approximating to those of equilibrium gliding (14–15 m/sec), flapping by Andean condors acts to reduce sinking speed and does so without increasing forward air speed. Apparently the flapping wing provides lift by increasing the speed of the air striking its surfaces and by twisting at the same time so as to present
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New model of flap-gliding flight

Journal of Theoretical Biology, 2015
A new modelling approach is presented for describing flap-gliding flight in birds and the associated mechanical energy cost of travelling. The new approach is based on the difference in the drag characteristics between flapping and non-flapping due to the drag increase caused by flapping. Thus, the possibility of a gliding flight phase, as it exists in
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Neuromuscular Correlates to the Evolution of Flapping Flight in Birds

Brain, Behavior and Evolution, 2000
The neuromotor pattern (i.e. the onset/offset of muscle contraction within the locomotor cycle) is conserved for some homologous muscles of the tetrapod shoulder but not others in the transition from terrestrial locomotion to flight. Here we test for three shoulder muscles of the European starling <i>(Sturnus vulgaris)</i> to determine ...
G E, Goslow, D, Wilson, S O, Poore
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