Results 11 to 20 of about 7,767,476 (330)
Aerodynamic and acoustic analysis of helicopter main rotor blade tips in hover [PDF]
International Journal of Numerical Methods for Heat and Fluid Flow, 2016 Purpose: The design of main rotor blade tips is of interest to helicopter manufactures since the tip details affect the performance and acoustics of the rotor. The paper aims to discuss this issue.
Barakos, George +4 more
core +4 more sources
Aircraft Engineering and Aerospace TechnologyPurpose Modern warfare and modern battlefield are very demanding. The recent conflicts showed that the usage of the helicopters is very limited and only the best constructions are able to provide support for the operations.
J. Kocjan, R. Rogólski
semanticscholar +4 more sources
Main rotor-body action for virtual blades model
EPJ Web of Conferences, 2018 This research aims to investigate a virtual blade model and assess rotor influence on helicopter fuselage aerodynamics. The rotor disk is discretized in the azimuthal direction, and a time-varied pressure jump is applied in regions occupied by the blades.
Kusyumov Alexander +6 more
doaj +2 more sources
Failure of a Helicopter Main Rotor Blade
Procedia Materials Science, 2014 A military helicopter crash was investigated. The aircraft was flying at cruise speed in clear sky at 1000 feet over a flat area. The crew suddenly lost the control of the helicopter that crashed in the immediately causing fatal injuries to the whole ...
M. Amura +4 more
semanticscholar +2 more sources
Procedia Structural Integrity, 2016 This paper deals with the phenomenon of fretting fatigue on the rotor shaft of a wind turbine at the shrink fit of the main bearing. The sensitivity of the rotor shaft for growing cracks that nucleate at the bearing seat is investigated and available ...
T. Rauert +3 more
semanticscholar +3 more sources
Methods for Attenuation of Helicopter [PDF]
فناوری در مهندسی هوافضا, 2023 Helicopters can be a source of loud noise. The high production noise of helicopters makes them unsuitable for densely populated areas, especially in low-flying conditions.
Hamid Parhizkar +2 more
doaj +1 more source
Computational studies of the rotors aerodynamic characteristics of multirotor drones
Научный вестник МГТУ ГА, 2021 The article presents the results of computational studies of aerodynamic characteristics for unmanned lift-generating multi-rotor drones of various configurations. The distinctive features of rotors flow were characterized.
K. G. Kosushkin +2 more
doaj +1 more source
Determination of loads in the ultralight helicopter blades
Aviation, 2023 The article describes research that was carried out on coaxial a single-seat ultralight helicopter Rotorschmiede VA-115 which is manufactured by German firm RS Helikopter GmbH.
Vitaly Dudnik
doaj +1 more source
Numerical investigation of full scale coaxial main rotor aerodynamics in hover and vertical descent
, 2021 The original free vortex wake model was used for numerical investigation. Calculation of the aerodynamic characteristics in hover and vertical descent modes in the range of vertical descent speed of 0–30 m/s including the Vortex Ring State (VRS) area was
P. Makeev, Yu. M. Ignatkin, A. Shomov
semanticscholar +1 more source
Strength analysis of the conceptual model of a main rotor blade spar with actuators
, 2021 This paper concerns the conceptual design of a main rotor blade spar with actuators. A three-dimensional model of a main rotor blade is based on the preliminary geometric blade setting angle to increase the aerodynamic performance caused by different ...
K. Siadkowska, P. Borowiec
semanticscholar +1 more source