Results 21 to 30 of about 15,084 (235)
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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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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Helicopter tail rotor orthogonal blade vortex interaction [PDF]
Progress in Aerospace Sciences, 2004 The aerodynamic operating environment of the helicopter is particularly complex and,\ud to some extent, dominated by the vortices trailed from the main and tail rotors. These\ud vortices not only determine the form of the induced flow field but also interact with\ud each other and with elements of the physical structure of the flight vehicle.
Coton, F.N. +3 more
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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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Dynamic modeling of helicopter rotor blades
Tsinghua Science and Technology, 2009 Abstract This paper is concerned with the dynamic analysis of a pre-twisted rotating composite rotor blade. General kinematical relations for a beam theory that treated finite rotation were established. Two sets of analyses were extracted from the 3-D nonlinear blade analysis: one is the 2-D linear cross section analysis, and the other is the 1-D ...
Yifeng Wang, Haowen Wang, Zheng Gao
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Gust Response Characteristics of Helicopter Rotor Blade [PDF]
Proceedings of the 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnology, 2016 The deformation of blades effected by gust would endanger the safety of wind turbine. Based on blades elastic deformation theory ,We established a model of blades rotation transient response ,studied the characteristics of blades transient response effected by gust, and confirmed the procedure of blades response to gust.
Guang-yao Yan +3 more
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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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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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