Results 181 to 190 of about 24,098 (229)

Aerodynamic Mechanism Research of Flapping Flight

Advanced Materials Research, 2011
Lift makes a vehicle in air and thrust makes advancing. The lift of flapping wing air vehicle is composed of two main parts, flapping lift and advancing lift. The advancing lift of flapping-wing is similar as of fixed-wing, generated mainly by relative velocity and angle of attack. The flapping lift is owned only by flapping wing.
Wen Qing Yang, Bi Feng Song, Wen Ping Song, Zhan Ke Li, Ya Feng Zhang   +4 more
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Computational Investigation of Flapping-Wing Flight

37th AIAA Fluid Dynamics Conference and Exhibit, 2007
An incompressible Navier-Stokes solver is developed for simulating flapping wings at Reynolds numbers of approximately 10-10 in which the governing equations are solved in an immersed boundary framework on fixed Cartesian meshes. In the present implementation, the influence of solid bodies on the flowfield is represented by a secondorder interpolation ...
Brandon Bush, James Baeder
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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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Aerodynamic Mechanisms of Flapping Flight

2015
The growing need for mobile aerial platforms capable of performing reconnaissance tasks and gathering intelligence in hazardous and physically inaccessible areas has given rise to an increasing interest in the development of micro aerial vehicles (MAVs), in view of their potential capabilities of versatile and highly maneuverable flight.
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On Flapping Flight of Aeroplanes

Aeronautical journal (London, England : 1897), 1899
It has been long known, principally through experiments on soaring, that a large, if not by far the largest, part of the supporting force obtained by birds in regular flight, is probably furnished by upward air pressure on their wings, regarded as planes moving horizontally, with their surfaces slightly inclined to the direction of motion.Langley's ...
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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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Challenges for 100 Milligram Flapping Flight

2009
Creating insect-scale flapping flight at the 0.1 gram size has presented significant engineering challenges. A particular focus has been on creating miniature machines which generate similar wing stroke kinematics as flies or bees. Key challenges have been thorax mechanics, thorax dynamics, and obtaining high power-to-weight ratio actuators.
Ronald S. Fearing, Robert J. Wood
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Flapping and Rotary Wing Flight

2016
In the previous chapters, we saw the flight of airplanes and gliders requires that a downwash must be created by the fixed wing as it moves through the air. The aerodynamic lift thus created depends crucially upon the speed relative to the atmosphere (airspeed), as well as on the incidence angle (angle-of-attack) made by the flight direction with the ...
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The Flapping Flight of Birds. II

Journal of the Royal Aeronautical Society, 1927
In a paper in the number of this journal for November, 1925, it was shown that if a flying machine were fitted with wings of standard section and these were flapped in a rhythmical manner, the machine would be supported and propelled, its weight, dimensions and velocity being those of a typical bird; the degree of accuracy attempted in the analysis did
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The Polar Flap-Byrd's Flight Confirmed

Navigation, 1973
This article was written in defense of Byrd's claim of making the first flight over the pole. In a recent book entitled Oceans, Poles and Airmen, the author, Richard Montague, gained world-wide attention when he gathered information denouncing the flight as a fraud. He relied on Bernt Balchen (who accompanied Byrd on his South Pole trip) and G.
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