نتایج جستجو برای: flapping wing

تعداد نتایج: 19414  

2011
Sophie Ramananarivo Ramiro Godoy-Diana Benjamin Thiria

A recent field of investigation concerns the efficiency of flapping flyers, the major interrogation being about how natural systems optimize energy saving together with performance enhancement. In particular, the passive role of wing flexibility to increase flight efficiency through the bending of the wings while flapping has attracted a lot of attention. It is commonly agreed that this efficie...

2011
Chang-kwon Kang Hikaru Aono Carlos E. S. Cesnik Wei Shyy

Effects of chordwise, spanwise, and isotropic flexibility on the force generation and propulsive efficiency of flapping wings are elucidated. For a moving body immersed in viscous fluid, different types of forces, as a function of the Reynolds number, reduced frequency (k), and Strouhal number (St), acting on the moving body are identified based on a scaling argument. In particular, at the Reyn...

Journal: :Applied sciences 2022

A power estimation approach for calculating the of a flapping-wing air vehicle (FWAV) in forward flight is proposed this paper. One challenges and essential points FWAVs endurance. In order to optimize FWAVs, it necessary analyze required addition kinematic aerodynamic analyses prototype. Previously, birds was limited their average power, which assumed lift usually same as gravitational force. ...

2012
T. Vanneste J. B. Paquet S. Grondel E. Cattan

Developing a FWNAV is an ambitious and arduous tasks relying currently mostly on trial and error method. In order to assist these developments, a preliminary design tool evaluating the aeroelastic performance of a flapping wing is sound. Our approach, coupling a structural finite element solver to a quasi-steady aerodynamic model, is here reported along with some of its applications: the select...

Journal: :The Journal of experimental biology 2008
Hao Wang Noriyasu Ando Ryohei Kanzaki

By combining optical triangulation with the comb-fringe technique and dual-channel telemetry, wing kinematics and body attitudes accompanying muscle activities of free-flying male hawkmoths were recorded synchronously when they performed flight manoeuvres elicited by a female sex pheromone. The results indicate that the wing leading edge angular position at the ventral stroke reversal, which ca...

2013
Lingxiao Zheng Tyson L. Hedrick Rajat Mittal

The aerodynamics of hovering flight in a hawkmoth (Manduca sexta) are examined using a computational modelling approach which combines a low-fidelity bladeelement model with a high-fidelity Navier–Stokes-based flow solver. The focus of the study is on understanding the optimality of the hawkmoth-inpired wingstrokes with respect to lift generation and power consumption. The approach employs a ti...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2016
Bret W Tobalske

Competing hypotheses about evolutionary origins of flight are the 'fundamental wing-stroke' and 'directed aerial descent' hypotheses. Support for the fundamental wing-stroke hypothesis is that extant birds use flapping of their wings to climb even before they are able to fly; there are no reported examples of incrementally increasing use of wing movements in gliding transitioning to flapping. A...

Journal: :PloS one 2016
Dmitry Kolomenskiy Masateru Maeda Thomas Engels Hao Liu Kai Schneider Jean-Christophe Nave

Aerodynamic ground effect in flapping-wing insect flight is of importance to comparative morphologies and of interest to the micro-air-vehicle (MAV) community. Recent studies, however, show apparently contradictory results of either some significant extra lift or power savings, or zero ground effect. Here we present a numerical study of fruitfly sized insect takeoff with a specific focus on the...

Journal: :TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 2008

2013
Aimy Wissa Nelson Guerreiro Jared Grauer Cornelia Altenbuchner James E. Hubbard Mary Frecker Richard Roberts

Unmanned Aerial Vehicles (UAVs) are proliferating in both the civil and military markets. Flapping wing UAVs, or ornithopters, have the potential to combine the agility and maneuverability of rotary wing aircraft with excellent performance in low Reynolds number flight regimes. The purpose of this paper is to present new free flight experimental results for an ornithopter equipped with one degr...

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