Results 221 to 230 of about 12,334 (255)

Method for the Extraction of Helicopter Main and Tail Rotor Noise

Journal of Aircraft, 2018
In this paper a method for the extraction of main and tail rotor noise from an acoustic pressure time history of a helicopter is described.
openaire   +2 more sources

The Main Rotor

2022
Kay Bruce, Occhiato John
openaire   +1 more source

VIBRATIONS OF A HELICOPTER ROTOR SYSTEM AND FUSELAGE INDUCED BY THE MAIN ROTOR BLADES IN FLIGHT

1953
Abstract : Based on a simplified model of the hub-fuselage structure, a theoretical analysis is made of the response of the hub and fuselage of a helicopter in flight to harmonic forces transmitted by the rotor blades to the hub both in, and normal to, the plan of rotation.
H. REISSNER, SHAO W. YUAN, MORRIS MORDUCHOW   +2 more
openaire   +1 more source

The Bearingless Main Rotor

Journal of the American Helicopter Society, 1980
Peter G. C. Dixon, Harold E. Bishop
openaire   +1 more source

Scaling of helicopter main rotor noise in hover

24th Aerospace Sciences Meeting, 1986
A 2.1-m-diam, one-sixth-scale model helicopter main rotor was tested in hover at the NASA Ames Outdoor Aerodynamic Research Facility. It had previously been tested in hover in the NASA Ames 40- by 80-Foot Wind Tunnel test section. The primary objective of the tests was to obtain acoustic and performance data on a medium-scale rotor at various thrust ...
openaire   +1 more source

Effect of rotor blade tip shape on helicopter main-rotor performance

2021
EFFECT OF ROTOR BLADE TIP SHAPE ON HELICOTER MAIN-ROTOR PERFORMANCE SUMMARY A helicopter is an aircraft that uses rotating wings to provide lift, propulsion, and control. The rotary wings can produce aerodynamics forces, which are generated by the relative motion of a wing surface with respect to the air, even when the velocity of the vehicle itself is
openaire   +1 more source

Tail Rotor Performance in Presence of Main Rotor, Ground, and Winds

Journal of the American Helicopter Society, 1974
Wayne Wiesner, Gary Kohler
openaire   +1 more source

Uncertainty Quantification of the Main Rotor Blades Measurements

2017
This chapter provides a novel approach in the field of uncertainty assessment of the experimental investigation of mechanical properties of load carrying structures made of composite material. A combination of experimental methods are used hereto. In the experimental part, different test configurations were taken into account.
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A state-of-the-art review on uncertainty analysis of rotor systems

Mechanical Systems and Signal Processing, 2023
J -J Sinou, Weidong Zhu, Kuan Lu
exaly  

Identification of rotor-stator rub and dependence of dry whip boundary on rotor parameters

Mechanical Systems and Signal Processing, 2021
Mayank Tiwari
exaly