Results 31 to 40 of about 7,948 (233)
An Analytical Method for Coaxial Helicopter Ground Resonance [PDF]
MATEC Web of Conferences, 2020 A time-frequency analytical method is presented to analyze physical mechanism of coaxial helicopter ground resonance. Eigenvalue calculation and numerical integration of disturbance equations of motions are used to obtain modal characters and time-domain
Liu Xiangyi +4 more
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Flight Mechanics Modeling of the New Configuration Tilt-rotor
Hangkong gongcheng jinzhan, 2019 The flight mechanical model of tilt-rotor UAV is the basis of designing flight control rate and analyzing flight characteristics.Based on the engineering reality, the nonlinear flight mechanics model of a new configuration tilt-rotor UAV is set up ...
Zhang Lian +3 more
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Research on Calculation Method for Acoustic Scattering of Helicopter Noise
Xibei Gongye Daxue Xuebao, 2020 A new calculation method of helicopter rotor/fuselage acoustic scattering is developed. Firstly, a CFD analysis model is developed to simulate flow field of the rotor, which is based on the motional embedded grid system and RANS equations, and provides ...
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Fracture fault analysis of tail rotor on a helicopter
Hangkong gongcheng jinzhan, 2023 Finding out the reason of the fracture fault of tail rotor on a helicopter is of practical significance for using and maintaining the helicopter and is of significant reference for improving safety of new type helicopter. The fracture fault of tail rotor
HOU Bo +3 more
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Influence of blade aerodynamic model on prediction of helicopter rotor aeroacoustic signatures [PDF]
, 2011 Brown’s vorticity transport model has been used to investigate how the local blade aerodynamic model influences the quality of the prediction of the high-frequency airloads associated with blade–vortex interactions, and thus the accuracy with which the ...
Kelly, Mary E. +3 more
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Quad-Rotor Helicopter Autonomous Navigation Based on Vanishing Point Algorithm
Journal of Applied Mathematics, 2014 Quad-rotor helicopter is becoming popular increasingly as they can well implement many flight missions in more challenging environments, with lower risk of damaging itself and its surroundings.
Jialiang Wang +5 more
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Optimal design of fixed-pitch coaxial-rotor helicopter by using Particle Swarm Optimization
Nihon Kikai Gakkai ronbunshu, 2016 In this study, the optimal mechanical design method for fixed-pitch coaxial-rotor helicopter is proposed. The fixed-pitch coaxial-rotor helicopter has several advantages compared with other type helicopters.
Masahiro TATSUNO +3 more
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Engineering Applications of Computational Fluid Mechanics, 2021 The coupled rotor/ship flowfield is investigated using the Navier–Stokes solver when the helicopter rotor hovers in the ship’s airwake. The solid rotor model (SRM) and virtual rotor model (VRM) are employed, considering the different types of rotor ...
Zhao Dingxuan +3 more
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RESULTS OF THE FIRST MI-171A2 FLYING LABORATORY TEST PHASE
Научный вестник МГТУ ГА, 2014 The present publication describes the results of the first stage of the flying laboratory (Mi-171 helicopter) flight tests performed at Mil Moscow Helicopter Plant, JSC facilities. Main rotor components with blades made of polymer composite materials and
V. A. Ivchin, K. Y. Samsonov
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The influence of helicopter tail rotor parameters on RCS
Hangkong gongcheng jinzhanHigh requirements have been placed on the stealth performance of armed helicopters during wartime missions，in order to reduce the probability of the helicopter being found during the task，based on geometric optics method and consistent diffraction theory，
ZHAO Qijun
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