Results 31 to 40 of about 66,325 (272)
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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Active Flow Control of Helicopter Rotor Based on Coflow Jet
International Journal of Aerospace Engineering, 2022 When a helicopter rotor undergoes flow separation, the drag of the rotor increases substantially, as does the power demand, which seriously affects the aerodynamic performance and flight safety of the helicopter.
Jiaqi Liu +4 more
semanticscholar +1 more source
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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Aerospace, 2021 Successful icing/de-icing simulations for rotorcraft require a good prediction of the convective heat transfer on the blade’s surface. Rotorcraft icing is an unwanted phenomenon that is known to cause flight cancelations, loss of rotor performance and ...
A. Samad +4 more
semanticscholar +1 more source
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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Multidisciplinary Aerodynamic Design of a Rotor Blade for an Optimum Rotor Speed Helicopter
, 2017 The aerodynamic design of rotor blades is challenging, and is crucial for the development of helicopter technology. Previous aerodynamic optimizations that focused only on limited design points find it difficult to balance flight performance across the ...
Jiayi Xie +3 more
semanticscholar +1 more source
Aerospace, 2023 An active rotor with trailing-edge flaps (TEFs) is an effective active vibration control method for helicopters. Blade flapping dynamic characteristics have a significant effect on the active vibration control performance of an active rotor.
Xiancheng Gu +3 more
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