Results 21 to 30 of about 7,767,476 (330)

Numerical analysis issues in the evaluation of the helicopter’s main rotor stability

, 2021
The paper presents selected aspects of numerical analyses on the assessment of the helicopter’s main rotor operational stability, presents key issues for stability assessment, and discusses the application of the co-simulation methodology for helicopter ...
R. Raczyński, K. Siadkowska
semanticscholar   +1 more source

To the problem of simulation modelling of abnormal and emergency flight situations in the process of Mi-8MTV helicopter pilot simulation training

Научный вестник МГТУ ГА, 2022
The article examines a method of obtaining the required initial data for adequate mathematical modelling of nonstationary processes in the Mi-8MTV helicopter computer and flight simulators. The principle of the method is as follows: the video fixation of
P. N. Rybkin, Yu. M. Сhinynchin
doaj   +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, V. A. Nikiforov, K. Yu. Samsonov   +2 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 ...
Choongmo YANG, Takashi AOYAMA, Natsuki KONDO, Shigeru SAITO   +3 more
openaire   +3 more sources

Computational study of aerodynamic characteristics of the Mi-8 type heli-copter’s tail rotors on the hovering with crosswind taking into account main rotor interaction

Авіаційно-космічна техніка та технологія, 2021
Under certain conditions of a helicopter flight, the main rotor can exert a rather strong effect on the tail rotor, changing its traction and power characteristics.
Михайло Юрійович Кибальний, Андрій Павлович Дьомін, Сергій Олександрович Дегтяренко, Микола Іванович Москаленко   +3 more
doaj   +1 more source

Investigations of the vortex ring state on a helicopter main rotor based on computational methodology using URANS solver

MATEC Web of Conferences, 2019
Computational investigations of the Vortex Ring State (VRS) on a helicopter main rotor have been conducted. The VRS phenomenon is a condition of powered flight that occurs most frequently during the vertical or nearly vertical descent of a rotorcraft ...
W. Stalewski, K. Surmacz
semanticscholar   +1 more source

Configuration Study of Electric Helicopters for Urban Air Mobility

Aerospace, 2021
There is currently interest in the design of small electric vertical take-off and landing aircraft to alleviate ground traffic and congestion in major urban areas.
Julia A. Cole, Lauren Rajauski, Andrew Loughran, Alexander Karpowicz, Stefanie Salinger   +4 more
doaj   +1 more source

Modelling of Flow Characteristics of Main Rotor with Elliptical Root Section in Hover Mode [PDF]

E3S Web of Conferences, 2023
The modelling of a helicopter main rotor flow field in hover regime is being considered. The aerodynamic and aeroacoustics characteristics of two rotor models with different blade root geometries are compared.
Kusyumov Sergey, Stepanov Robert, Kusyumov Alexander, Mirgazov Ruslan, Kritsky Boris   +4 more
doaj   +1 more source

CALCULATED RESEARCH OF INFLUENCE OF HELICOPTER MAIN ROTORS GEOMETRY ON THE EFFICIENCY IN HOVER MODE BASED ON THE NONLINEAR VORTEX MODEL

Научный вестник МГТУ ГА, 2018
The efficiency of the helicopter main rotor in the hover mode is very important, because this mode essentially determines the performance characteristics of the helicopter.
Y. M. Ignatkin, P. V. Makeev, A. I. Shomov   +2 more
doaj   +1 more source

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 ...

doaj   +1 more source