Results 71 to 80 of about 25,595 (255)

Experimental Study of the Aerodynamic Interaction between the Forewing and Hindwing of a Beetle-Type Ornithopter

Aerospace, 2018
Beetles have attracted attention from researchers due to their unique combination of a passively flapping forewing and an actively flapping hindwing during flight.
Hidetoshi Takahashi, Kosuke Abe, Tomoyuki Takahata, Isao Shimoyama   +3 more
doaj   +1 more source

Classifying avian drinking behaviour: ecological insights and implications in a changing world

Biological Reviews, EarlyView.
ABSTRACT Water is a fundamental currency of life, and its availability significantly influences animal behaviour, physiology and distributions. However, our knowledge around the dependence on water for drinking and the direct and indirect mechanisms driving related behaviours remains partial in the context of changing climates. Here, we review patterns
Shannon R. Conradie, Marc T. Freeman
wiley   +1 more source

Insect‐Inspired Drones: Adjusting the Flapping Kinetics of Insect‐Inspired Wings Improves Aerodynamic Performance

Advanced Intelligent Systems
Insects flap their wings through a highly specialized musculoskeletal system that allows the wings to rotate about three degrees of freedom. Consequently, the wingtip trajectory is adjustable in 3D, and accompanied with appropriate wing feathering (wing ...
Leeor Mordoch, Eyal Sabag, Gal Ribak, Bat‐El Pinchasik   +3 more
doaj   +1 more source

Flight of the dragonflies and damselflies [PDF]

, 2016
This work is a synthesis of our current understanding of the mechanics, aerodynamics and visually mediated control of dragonfly and damselfly flight, with the addition of new experimental and computational data in several key areas.
Alexander DE, Alexander DE, Azuma A, Bomphrey RJ, Chadwick LE, Corbet S, Dijkstra K-DB, Ennos AR, Grimaldi D, Hertel H, Huai-Ti Lin, Kesel AB, Liu H, Luttges M, Magnan A, May ML, Neville AC, Newman BG, Newman DJS, Okamoto M, Per Henningsson, Rajabi H, Richard J. Bomphrey, Rudolph R, Rüppell G, Stepniewski WZ, Toshiyuki Nakata, Wakeling JM, Wakeling JM, Wakeling JM   +29 more
core   +2 more sources

Butterflies of curriculum realisation: Investigating early implementation of the Curriculum for Wales

The Curriculum Journal, EarlyView.
Abstract Curriculum reform provides a vital opportunity for nations to ensure learners are equipped to fully participate as citizens in the 21st century. This paper presents an understanding of educators’ response to curriculum reform, and some of its enablers and barriers.
Alison Glover, Claire Sinnema, Sam McAlister‐Wilson, Nia Cole‐Jones, Brett Duggan, Hefin Thomas   +5 more
wiley   +1 more source

A Wind Tunnel Experimental Study on the Flexible Flapping Wing With an Attached Airfoil to the Root

IEEE Access, 2019
With the purpose to improve the performance of the flexible membrane flapping wing, a kind of flapping wing with an attached airfoil to the root is designed and tested in a wind tunnel.
Peng Nian, Bifeng Song, Jianlin Xuan, Wenqing Yang, Yuanbo Dong   +4 more
doaj   +1 more source

Analysis on Hover Control Performance of T- and Cross-Shaped Tail Fin of X-Wing Single-Bar Biplane Flapping Wing

Journal of Robotics, 2020
The current flapping wing adopts T-shaped or cross-shaped tail fin to adjust its flight posture. However, how the tail fin will affect the hover control is not very clear.
Pingxia Zhang, Junru Zhu, Yongqiang Zhu
doaj   +1 more source

On unidirectional flight of a free flapping wing

, 2006
International audienceWe study the dynamics of a rigid, symmetric wing that is flapped vertically in a fluid. The motion of the wing in the horizontal direction is not constrained.
Childress, Stephen, Vandenberghe, Nicolas, Zhang, Jun   +2 more
core   +4 more sources

Optimized kinematics enable both aerial and aquatic propulsion from a single three-dimensional flapping wing [PDF]

, 2018
Flapping wings in nature demonstrate a large force envelope, with capabilities far beyond the traditional limits of static airfoil section coefficients. Puffins, murres, and other auks particularly showcase this effect, as they are able to generate both ...
Izraelevitz, Jacob Samuel, Kotidis, Miranda P., Triantafyllou, Michael S   +2 more
core   +1 more source

Coupled Fluid–Structure–Acoustic Analysis of Flow‐Induced Noise Control Using an Elastic Baffle in a Micro Channel

Energy Science &Engineering, EarlyView.
This research explores how fluid flow, structural movement, and sound interact in an elastic baffle system. Using a numerical approach based on the finite element method, the study analyzes how noise and vibrations change with different baffle configurations. The findings reveal that shortening the baffle by half reduces noise transmission by 9%, while
Tohid Adibi, Seyed Esmail Razavi, Shams Forruque Ahmed, Khashayar Fardnia, Aydin Qheydarpoor, Hammad Alotaibi   +5 more
wiley   +1 more source