Results 11 to 20 of about 64,082 (287)
Data-driven analysis and new findings on the loss of tail rotor effectiveness in helicopter accidents [PDF]
Scientific Reports, 2022 Loss of tail rotor effectiveness (LTE) is an unstable dynamic phenomenon that affects single-rotor helicopters and frequently leads to accidents. LTE accidents recur with troubling regularity and show no sign of abatement.
Joseph Homer Saleh +5 more
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Research on Tail Rotor Load Test Flight Technology for Helicopters Based on Strain Sensor Measurement [PDF]
SensorsThe load characteristics of the helicopter tail rotor system are critical to flight safety and handling performance, and flight testing remains the most direct and reliable means to obtain authentic load data.
Shuaike Jiao +3 more
doaj +2 more sources
Авіаційно-космічна техніка та технологія, 2021 Under certain conditions of a helicopter flight, the main rotor can exert a rather strong effect on the tail rotor, changing its traction and power characteristics.
Михайло Юрійович Кибальний +3 more
doaj +1 more source
International Journal of Aerospace Engineering, 2020 The tail rotor of a helicopter operating under low-speed crosswind undergoes highly complex flow due to the interaction between the main rotor, fuselage, and tail rotor system.
Nahyeon Roh, Sejong Oh, Donghun Park
doaj +1 more source
Research on Calculation Method for Acoustic Scattering of Helicopter Noise
Xibei Gongye Daxue Xuebao, 2020 A new calculation method of helicopter rotor/fuselage acoustic scattering is developed. Firstly, a CFD analysis model is developed to simulate flow field of the rotor, which is based on the motional embedded grid system and RANS equations, and provides ...
doaj +1 more source
An analysis of the efficiency of Coanda - NOTAR anti-torque systems for small helicopters [PDF]
INCAS Bulletin, 2010 The use of jet thrust for anti-torque for monorotor small helicopters is based on thecirculation control concept, which result in a distributed side force along the entire tail boomassembly. High velocity jets of air from a pressurized tail boom is blown
Mircea BOŞCOIANU, Ionică CÎRCIU
doaj +1 more source
Configuration Study of Electric Helicopters for Urban Air Mobility
Aerospace, 2021 There is currently interest in the design of small electric vertical take-off and landing aircraft to alleviate ground traffic and congestion in major urban areas.
Julia A. Cole +4 more
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Xibei Gongye Daxue Xuebao, 2019 This paper studies helicopter optimal landing and control procedure after tail rotor control failure (TRCF) in different collective pitch. The optimal control problem of landing after tail rotor control failure was solved numerically by direct multiple ...
doaj +1 more source
Influence of Rotor Dynamic Scattering on Helicopter Radar Cross-Section
Sensors, 2020 With the continuous improvement and development of armed helicopters, the research on their stealth characteristics has become more and more in depth. In order to obtain the complex effect of stealth characteristics caused by the high-speed rotation of ...
Zeyang Zhou, Jun Huang
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A Single Oscillator-Excited Piezoelectric Actuator with Internal Contact Teeth
Micromachines, 2023 The tail rotor of a helicopter, a crucial component, traditionally relies on a complex drive mode involving reducers and transmission gears. This conventional setup, with its lengthy transmission chain and numerous components, hinders miniaturization ...
Die Fang +7 more
doaj +1 more source