Results 71 to 80 of about 30,459 (234)
International Journal of Mechanical System Dynamics, Volume 5, Issue 3, Page 463-480, September 2025.ABSTRACT The supercritical drive shaft is becoming increasingly popular in helicopter transmission system. Dry friction dampers are specially employed to ensure the supercritical shafts crossing the critical speed safely. Due to design tolerances, manufacturing errors and time‐varying factors, the parameters of the damper are inherently uncertain ...
Liyao Song +4 more
wiley +1 more source
Helicopter far-field acoustic levels as a function of reduced main-rotor advancing blade-tip Mach number [PDF]
During the design of a helicopter, the weight, engine, rotor speed, and rotor geometry are given significant attention when considering the specific operations for which the helicopter will be used. However, the noise radiated from the helicopter and its
Lemasurier, Philip +2 more
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Wind Energy, Volume 28, Issue 9, September 2025.ABSTRACT Conventional methods for manufacturing rotor blades, such as composite construction and die casting, are hindered by high costs due to expensive molds, while 3D printing often results in poor quality or high production costs with unfavorable cost‐per‐part scaling.
Moritz Burmester +2 more
wiley +1 more source
RESULTS OF THE FIRST MI-171A2 FLYING LABORATORY TEST PHASE
Научный вестник МГТУ ГА, 2016 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
doaj
Engineering Applications of Computational Fluid Mechanics, 2019 Coupled ship/coaxial-rotor simulations have been conducted to investigate the rotor loads of a shipborne coaxial-rotor helicopter during a vertical landing based on Reynolds-averaged Navier-Stokes (RANS) solver.
Dacheng Su +3 more
doaj +1 more source
Main rotor-tail rotor intraction and its implications for helicopter directional control [PDF]
, 2008 Aerodynamic interference between the main and tail rotor can have a strong negative influence on the flight mechanics of a conventional helicopter. Significant unsteadiness in the tail rotor loading is encountered under certain flight conditions, but the
Brown, R.E., Fletcher, Timothy M.
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Rotorcraft research testing in the National Full-Scale Aerodynamics Complex at NASA Ames Research Center [PDF]
The unique capabilities of the National Full-Scale Aerodynamics Complex (NFAC) for testing rotorcraft systems are described. The test facilities include the 40- by 80-Foot Wind Tunnel, the 80- by 120-Foot Wind Tunnel, and the Outdoor Aerodynamic Research
Johnson, W., Smith, C. A., Warmbrodt, W.
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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 +2 more
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Sand Erosion Resistance and Failure Mechanism of Polyurethane Film on Helicopter Rotor Blades. [PDF]
Polymers (Basel), 2023 Zheng L, Fan J, Gong Q, Sun W, Jia X.
europepmc +1 more source
Pneumatic boot for helicopter rotor deicing [PDF]
, 1981 Pneumatic deicer boots for helicopter rotor blades were tested. The tests were conducted in the 6 by 9 ft icing research tunnel on a stationary section of a UH-IH helicopter main rotor blade.
Blaha, B. J., Evanich, P. L.
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