Lifting and Transport of Martian Dust by the Ingenuity Helicopter Rotor Downwash as Observed by High-Speed Imaging From the Perseverance Rover. [PDF]
J Geophys Res Planets, 2022 Lemmon MT +9 more
europepmc +1 more source
Calculated Hovering Helicopter Flight Dynamics with a Circulation Controlled Rotor [PDF]
The influence of the rotor blowing coefficient on the calculated roots of the longitudinal and lateral motion was examined for a range of values of the rotor lift and the blade flap frequency.
Chopra, I., Johnson, W.
core +1 more source
Hysteresis Compensation for a Piezoelectric Actuator of Active Helicopter Rotor Using Compound Control. [PDF]
Micromachines (Basel), 2021 Zhou J, Dong L, Yang W.
europepmc +1 more source
Results of the flight noise measurement program using a standard and modified SH-3A helicopter [PDF]
A field noise measurement program has been conducted using both a standard SH-3A helicopter and an SH-3A helicopter modified to reduce external noise levels.
Henderson, H. R. +2 more
core +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.
core +1 more source
A Case of Penetrating Head Wound Due to Helicopter Rotor Blade Injury in a 34-Year-Old Naval Helicopter Pilot Who Returned to Active Service 5 Years Later. [PDF]
Am J Case Rep, 2021 Hsieh CC +6 more
europepmc +1 more source
Results of the noise measurement program on a standard and modified OH-6A helicopter [PDF]
A field noise measurement program has been conducted on a standard OH-6A helicopter and one that had been modified by reducing the rotor speed, altering rotor tip shape, and treating the engine exhaust and inlet to reduce the external noise levels.
Henderson, H. R. +2 more
core +1 more source
, 1978 A low-friction, axially extensible strut, automatically lockable in both tension and compression, for use as a secondary load path in helicopter main rotor force measurement systems is ...
Bonisch, F. H.
core +1 more source
Dynamics of helicopter rotor blades
Computers & Structures, 1988 A rotating blade finite element with coupled bending, torsion and axial stretching degrees-of-freedom is developed. APL is used for symbolic manipulations required for the development of the element. The element is implemented in MSC/NASTRAN to generate the numerical results.
Magari, P. J. +2 more
openaire +1 more source
Study on dynamic characteristics of the helicopter main transmission system
Jixie chuandongObjectiveTo identify the main excitation frequencies that cause the vibration of the helicopter main transmission system and reveal the influence of system speed, rotor torque, and rotor lift on the dynamic characteristics of the helicopter main ...
XU Huachao +5 more
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