Results 21 to 30 of about 15,230 (231)
Shock and Vibration, 2011 An active control method utilizing the multiple trailing edge flap configuration for rotorcraft vibration suppression and blade loads control is presented.
Uğbreve;ur Dalli +1 more
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Aerodynamic Modeling and Performance Analysis of Variable-Speed Coaxial Helicopter
Applied Sciences, 2022 In this paper, the variable-speed coaxial helicopter is modelled by the blade element method, non-uniform inflow method and empirical function method, and the aerodynamic performance analysis method is proposed.
Anan Xu, Fang Wang, Ming Chen, Liang Li
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Numerical simulation of deformations of a specimen of a composite helicopter blade as part of a resonant vibration set-up [PDF]
E3S Web of Conferences, 2023 To determine the fatigue life of the tail rotor blade of a helicopter made of polymer composite materials (CM), a method of fatigue testing of the specimens of the blade with accompanied numerical modeling of the deformed state has been developed.
Fedorov D., Shcherban K.
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Open Research Europe, 2022 Background: The rotor blades with fixed geometry in today’s helicopters do not give the best performance throughout the duration of any mission. However, low-speed and high-speed flights have different geometrical requirements for the shape of the most ...
Stephan Benz, Rohin Kumar Majeti
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Calculation and Analysis of Shipboard Helicopter Aero-elastic Response Using CFD Method on Ship-deck
Hangkong gongcheng jinzhan, 2022 The shipboard helicopter is in a harsh environment,which can cause the accidents of rotor tip over-swing and body collision.The research on the aero-elastic response on the ship surface of the helicopter can prevent such accidents.The computational fluid
ZHANG Ran +3 more
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Failure of a Tail Rotor Blade in a Helicopter [PDF]
, 2005 Abstract A helicopter lost the outboard rib on a tail rotor blade in flight and was forced to land because of the resulting vibrations. The investigation that followed is described in this chapter along with key findings. As shown in a sketch, the rib is held in place by a set of six rivets.
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Modal Numerical Analysis of Helicopter Rotor Sample Using Holzer-Myklestad Method [PDF]
Journal of Stress Analysis, 2018 Since rotor system of helicopters is responsible for producing lift forces and thrust, analyzing their vibrations is very essential. This research describes a method applied for developing a computer program to analyze coupled vibration of helicopter ...
H. Rabiee, S.A. Galehdari
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Failure of a Helicopter Main Rotor Blade
Procedia Materials Science, 2014 AbstractA military helicopter crash was investigated. The aircraft was flying at cruise speed in clear sky at 1000 feet over a flat area. The crew suddenly lost the control of the helicopter that crashed in the immediately causing fatal injuries to the whole crew.
Amura, Mikael +4 more
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International Journal of Aerospace Engineering, 2015 The aim of this paper is the assessment of the capability of controllers based on the combined actuation of flaps and variable-stiffness devices to alleviate helicopter main rotor vibratory hub loads. Trailing-edge flaps are positioned at the rotor blade
Massimo Gennaretti +3 more
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Fast Computational Aeroelastic Analysis of Helicopter Rotor Blades [PDF]
2018 AIAA Aerospace Sciences Meeting, 2018 The use of a new aeroelastic computer framework called Flexit is described and the frame-work is used to analyse the dynamic aeroelastic behaviour of a four-bladed helicopter main rotor. Flexit implements a loose coupling between unsteady vortex lattice method (UVLM) and numerical solution of the inhomogeneous Euler-Bernoulli partial differential ...
Fleischmann, Dominique +2 more
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