Results 91 to 100 of about 15,230 (231)

Numerical Simulation of Helicopter Blade Bullet Penetration in Maneuvering State

Hangkong gongcheng jinzhan, 2019
The study on the impact damage of helicopter rotor blade under maneuvering condition is of important significance. Based on the rotor blade of a certain type of machine, a numerical simulation method of projectile attack on the rotor blade under the ...
Lin Changliang, Zhu Yuefa, Hu Wengang
doaj   +1 more source

Effects of nonuniform swash-plate stiffness on coupled blade-control system dynamics and stability [PDF]

, 1972
Program has been developed that analytically determines effects of nonuniform swash-plate support stiffness, swash-plate flexibility, and out-of-blade track on vibratory mechanical stability characteristics of helicopter rotor systems.
Piarulli, V. J.
core   +1 more source

Design of a Periodic Structure for Composite Helicopter Rotor Blade

International Journal of Simulation Modelling
This study investigates the design and optimization of a 3D periodic structure to minimize vibrations in helicopter rotor blade systems. The research focuses on nonlinear models for rotating beams using a hybrid formulation of finite element methods and variational asymptotic beam sectional analysis.
Ozel, M. A., Kopmaz, O.
openaire   +2 more sources

Helicopter rotor trailing edge noise [PDF]

A two dimensional section of a helicopter main rotor blade was tested in an acoustic wind tunnel at close to full-scale Reynolds numbers to obtain boundary layer data and acoustic data for use in developing an acoustic scaling law and testing a first ...
Amier, R. K., Schlinker, R. H.
core   +1 more source

The effect of helicopter configuration on the fluid dynamics of brownout [PDF]

, 2008
Brown’s Vorticity Transport Model, coupled to an additional particle transport model, is used to simulate the development of the dust cloud that can form around a helicopter when operating in dusty or desert conditions.
Brown, R., Phillips, C.
core   +1 more source

Investigation of the Effect of Blade Sweep on Rotor Vibratory Loads [PDF]

The effect of helicopter rotor blade planform sweep on rotor vibratory hub, blade, and control system loads has been analytically investigated. The importance of sweep angle, sweep initiation radius, flap bending stiffness and torsion bending stiffness ...
Tarzanin, F. J., Jr., Vlaminck, R. R.
core   +1 more source

DETERMINATION OF OPTIMAL AZIMUTH FOR MOUNTING ULTRALIGHT COAXIAL HELICOPTER BLADES

Advanced Engineering Research, 2011
The possibility of reducing vibration of the ultralight coaxial helicopter blades on the through harmonic wave by mounting blades on the optimal azimuth is shown.
Vitaly V. Dudnik, Vladimir A. Kolot
doaj  

Correlation of SA349/2 helicopter flight-test data with a comprehensive rotorcraft model [PDF]

A comprehensive rotorcraft analysis model was used to predict blade aerodynamic and structural loads for comparison with flight test data. The data were obtained from an SA349/2 helicopter with an advanced geometry rotor.
codes., Yamauchi, Gloria K.
core   +1 more source

DETERMINATION OF OPTIMAL AZIMUTH FOR MOUNTING ULTRALIGHT COAXIAL HELICOPTER BLADES

Вестник Донского государственного технического университета, 2018
The possibility of reducing vibration of the ultralight coaxial helicopter blades on the through harmonic wave by mounting blades on the optimal azimuth is shown.
Vitaly V. Dudnik, Vladimir A. Kolot
doaj  

Rotor blade design and dynamic characteristics analysis of unmanned helicopter

Hangkong gongcheng jinzhan
The widespread application of composite materials in blades also makes the force and stiffness characteristics of blades more complex than traditional blades.
GAO Hongbo
doaj   +1 more source