Results 31 to 40 of about 22,232 (271)
A Single Oscillator-Excited Piezoelectric Actuator with Internal Contact Teeth
Micromachines, 2023 The tail rotor of a helicopter, a crucial component, traditionally relies on a complex drive mode involving reducers and transmission gears. This conventional setup, with its lengthy transmission chain and numerous components, hinders miniaturization ...
Die Fang +7 more
doaj +1 more source
Numerical analysis for main-rotor/tail-rotor interaction of helicopter
Numerical analysis for main-rotor/tail-rotor interaction of helicopter, 2008 A simulation method for full helicopter configuration is constructed by combining an unsteady Euler code and an aeroacoustic code based on the Ffowcs-Williams and Hawkings formulation. The flow field and helicopter noise are calculated using a moving overlapped grid system, and the mutual effect of main rotor and tail rotor are studied for the ...
YANG, Choongmo +3 more
openaire +2 more sources
The flow field around a rotor in axial descent [PDF]
, 2005 Measurements of the flow field around a model rotor descending axially into its own vortex wake have been performed using particle image velocimetry (PIV). At low descent rates, the expected cylindrical down-flow structure below the rotor is observed. At
Brown, R.E., Gillies, E.A., Green, R.B.
core +1 more source
THE EFFECT OF DIFFERENT OPTIONS OF BLADES MAIN ROTOR ON THE X-SHAPED TAIL ROTOR OF THE MI-171 LL
Научный вестник МГТУ ГА, 2018 This paper describes the effect of different rotor blades on the X-shaped tail rotor of the Mi-171 LL, observed conducting flight tests. The tests were carried out on the same helicopter in the similar atmospheric conditions.The objective of the tests ...
V. A. Ivchin +2 more
doaj +1 more source
International Journal of Applied Mathematics and Computer Science, 2023 This article deals with modelling and a flatness-based robust trajectory tracking scheme for a two degrees of freedom helicopter, which is subject to four types of tail rotor disturbances to validate the control scheme robustness. A mathematical model of
Sánchez-Meza Victor-Gabriel +4 more
doaj +1 more source
Imaging and Motion Parameter Estimation of Flying Helicopter With Duo Airborne SARs in
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2022 Duo airborne synthetic aperture radars in the $X$-band are proposed to acquire images of a flying helicopter. The backscattered signals manifest entangled features attributed to the compound linear motion of fuselage and spin motion of rotors.
Chou-Wei Kiang, Jean-Fu Kiang
doaj +1 more source
Experimental research of single - rotor helicopter unintentional yaw rotation
Научный вестник МГТУ ГА, 2020 Aviation accidents related to unintentional rotation may periodically occur while flying single-rotor helicopters. On-time and correct actions may help the pilot to find the way out of this hazardous situation.
V. V. Efimov +3 more
doaj +1 more source
Machines, 2022 Vertical take-off and landing (VTOL) aircraft have become important aerial vehicles for various sectors, such as security, health, and commercial sectors.
Emmanuel Alejandro Islas-Narvaez +4 more
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Simulation of wind turbine wake interaction using the vorticity transport model [PDF]
, 2010 The aerodynamic interactions that can occur within a wind farm can result in the constituent turbines generating a lower power output than would be possible if each of the turbines were operated in isolation.
Fletcher, Timothy M. +5 more
core +1 more source
Modelling the aerodynamics of coaxial helicopters : from an isolated rotor to a complete aircraft [PDF]
, 2008 This paper provides an overview of recent research on the aerodynamics of coaxial rotors at the Rotorcraft Aeromechanics Laboratory of the Glasgow University Rotorcraft Laboratories.
Brown, R.E. +5 more
core +1 more source