Results 11 to 20 of about 98,557 (299)
Micromachines, 2023 This study focused on the in-hover aerodynamics of a small rotor with a thin circular-arc airfoil and a convex structure at a low Reynolds number. The method combined computational fluid dynamics (CFD) with the blade element momentum theory (BEMT).
Yao Lei +3 more
doaj +1 more source
The Aerodynamic Performance of a Novel Overlapping Octocopter Considering Horizontal Wind
Aerospace, 2023 This paper investigates the aerodynamic performance of an overlapping octocopter with the effect of horizontal wind ranging from 0 to 4 m/s using both low-speed wind tunnel tests and numerical simulations.
Yao Lei, Jie Wang, Yazhou Li
doaj +1 more source
Computational Investigation of Blade–Vortex Interaction of Coaxial Rotors for eVTOL Vehicles
Energies, 2022 In the design of electric vertical takeoff and landing (eVTOL) vehicles, coaxial rotors have garnered significant attention due to their superior space usage and aerodynamic efficiency compared to standard rotors.
Ziyi Xu +3 more
doaj +1 more source
Research on control strategy of four rotorcraft tracking ground moving target
Dianzi Jishu Yingyong, 2018 In order to enable the four rotorcraft to track the ground moving target, the spatial position control strategy of four rotorcraft is studied. Firstly, the attitude PID control of the four rotorcraft is improved and the appropriate parameters are set ...
Huang Ruimin +4 more
doaj +1 more source
Accurate Predictions of Hovering Rotor Flows Using CFD [PDF]
, 2017 With work on the S-76 rotor providing encouraging results regarding the prediction of integral loads with CFD in hover, the XV-15 rotor is now analysed. Fully turbulent and transitional results are obtained showing the capability of modern CFD methods.
Barakos, George N. +2 more
core +1 more source
Basic and Applied Ecology, 2023 Urban greenspaces are vital refugia for insect biodiversity, but seasonal fluctuation responses of insect taxa to urbanisation and local attributes of urban greenspaces are not well known.
Manuel E. Lequerica Tamara +4 more
doaj +1 more source
Numerical and Experimental Estimation of the Efficiency of a Quadcopter Rotor Operating at Hover
Energies, 2019 Globalization has led to an increase in the use of small copters for different activities such as geo-referencing, agricultural fields monitoring, survillance, among others.
Andres M. Pérez G. +4 more
doaj +1 more source
Studia Ecologiae et Bioethicae, 2003 in English is not available for this article.
Gerhard Höver
doaj +1 more source
Multi‐UAV cooperative trajectory optimisation for a multi‐hop UAV relaying network
Electronics Letters, 2021 In this letter, an unmanned aerial vehicle (UAV) assisted data collection scenario is considered in the Internet of Things (IoT), where a multi‐hop UAV relaying network is constructed for real‐time data transmission.
Cuntao Liu, Yan Guo, Ning Li, Bin Zhou
doaj +1 more source
Notes on the Afrotropical hover fly genus Meromacroides Curran (Syrphidae, Eristalinae) [PDF]
African Invertebrates, 2021 The African endemic hover fly Meromacroides meromacriformis (Bezzi, 1915) (Syrphidae, Eristalinae) was described more than a century ago and its monotypic status established in 1927, but subsequent collections and publications are rare. Only the male has
Terence Bellingan +3 more
doaj +3 more sources