Results 21 to 30 of about 6,631,530 (188)

Control Strategy for Powered Flight Following Tail Rotor Failure in Helicopters

Machines
Tail rotor failure represents a critical emergency in helicopter flight operations. Conventional recovery mandates an immediate engine shutdown and transition to autorotation, significantly compromising both mission survivability and operational ...
Xinming Feng, Haiming Tian, Rui Zu, Yi Luo, Jianbo Li   +4 more
doaj   +1 more source

Mi-24 Helicopter Full Scale Fatigue Test Concept

Fatigue of Aircraft Structures, 2019
This paper presents a general concept of the Full Scale Fatigue Test of the Mi-24 helicopter including the test layout and load distribution, as well as describes the milestones to be achieved.
Reymer Piotr, Zieliński Wojciech, Piątkowski Łukasz, Dziendzikowski Michał, Kurnyta Artur, Wrąbel Rafał, Cichocki Tomasz, Leśniczak Andrzej, Kurdelski Marcin, Dragan Krzysztof   +9 more
doaj   +1 more source

Helicopter tail rotor orthogonal blade vortex interaction [PDF]

, 2004
The aerodynamic operating environment of the helicopter is particularly complex and, to some extent, dominated by the vortices trailed from the main and tail rotors. These vortices not only determine the form of the induced flow field but also interact
Marshall, J.S., F.N. Coton, J.S. Marshall, Galbraith, R.A.McD., Green, R.B., R.B. Green, R.A.McD. Galbraith, Coton, F.N.   +7 more
core   +1 more source

Experimental observations of an 8 m/s drop test of a metallic helicopter underfloor structure onto water: part 2. [PDF]

, 2007
This is the second part of a two-part paper that describes the experimental observations for two similar sections of floor that were dropped onto both hard and water surfaces at 8 m/s, as part of one experimental campaign.
Hughes, Kevin, Vignjevic, Rade, Campbell, James C.   +2 more
core   +5 more sources

Numerical simulation of the coupled flow field in helicopter/tanker interaction

Kongqi donglixue xuebao
To investigate the aerodynamic interference caused by tanker wake on helicopter during aerial refueling, a numerical simulation method for the coupled flow field of tanker and helicopter based on the Reynolds-Averaged Navier-Stokes (RANS) equations is ...
Xikang Dai, Zhao Cui, Yongjie Shi, Guohua Xu   +3 more
doaj   +1 more source

Time domain System Identification of Longitudinal Dynamics of Single Rotor Model Helicopter using SIDPAC [PDF]

Mehran University Research Journal of Engineering and Technology, 2015
This paper presents a time-domain approach for identification of longitudinal dynamics of single rotor model helicopter. A frequency sweep excitation input signal is applied for hover flying mode widely used for space state linearized model.
Arbab Nighat Khizer, Imtiaz Hussain, Wanod Kumar   +2 more
doaj  

Sensitivity of tail rotor noise to helicopter configuration in forward flight [PDF]

, 2009
Understanding the mechanisms that lead to the production of noise by tail rotors across a broad range of flight conditions and helicopter configurations remains an active area of research.
Fletcher, Timothy M., Brown, R.E., Fletcher, T.M., Duraisamy, K., Duraisamy, Karthikeyan, Brown, Richard   +5 more
core   +1 more source

test

, 2023
testtes
test, test
core  

Study on Helicopter Antitorque Device Based on Cross-Flow Fan Technology

International Journal of Aerospace Engineering, 2016
In order to improve low-altitude flight security of single-rotor helicopter, an experimental model of a helicopter antitorque device is developed for wind tunnel test. The model is based on the flow control technology of the cross-flow fan (CFF).
Du Siliang, Tang Zhengfei, Xu Pei, Ji Mengjiang   +3 more
doaj   +1 more source

LIFETIME DETERMINATION OF ULTRALIGHT HELICOPTER BLADES [PDF]

Transport Problems
Determining the guaranteed operational time of helicopter blades is one of the important tasks necessary for successful vehicle use. Flight tests on different modes and special fatigue benches are used to solve such problems.
Vitaly DUDNIK
doaj   +1 more source