Results 231 to 240 of about 54,340 (264)

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.
openaire   +1 more source

A state-of-the-art review on uncertainty analysis of rotor systems

Mechanical Systems and Signal Processing, 2023
J-J Sinou, Yongfeng Yang, Weidong Zhu
exaly  

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

Mechanical Systems and Signal Processing, 2021
Akhilendra Singh, Mayank Tiwari
exaly  

Splitting of waves in rotor-in-rotor nonlocal metamaterials by internal rotor coupling

Materials and Design, 2022
Yuqiang Gao, Lifeng Wang, Kun Wu
exaly  

Dynamic analysis of Jeffcott rotor under uncertainty based on Chebyshev convex method

Mechanical Systems and Signal Processing, 2022
Yongfeng Yang
exaly