Results 201 to 210 of about 12,334 (255)

Passive Blade Optimization and Evaluation in Off-Design Conditions [PDF]

, 2013
Wilke, Gunther, Imiela, Manfred
core  

Aerodynamics and aeroacoustics of helicopter main-rotor/tail-rotor interaction [PDF]

5th AIAA/CEAS Aeroacoustics Conference and Exhibit, 1999
Preliminary results from an ongoing effort to model the interaction aerodynamics and aeroacoustics of main- and tail rotor of a helicopter in subsonic flow are presented. The configurations studied are a) a two-blade main- and tail rotor in hover, and b) a four-blade main- and a two-blade tail rotor in climb flight.
Ahmed, S.R., Yin, J.
openaire   +3 more sources

Helicopter Main-Rotor/Tail-Rotor Interaction [PDF]

Journal of the American Helicopter Society, 2000
Preliminary results from a study to model the interaction aerodynamics and aeroacoustics of the main and tail rotor of a helicopter in subsonic flow are presented. The configurations studied are: 1) two bladed main and tail rotors in hover, and 2) a four-bladed main rotor and two-bladed tail rotor in climbing flight.
Yin, J., Ahmed, S.R.
openaire   +4 more sources

Interactional Aerodynamics and Aeroacoustics of Helicopter Main-Rotor/Tail-Rotor and Main-Rotor/Fuselage [PDF]

, 1999
This paper address two problems of the helicopter flowfield: the aerodynamic and aeroacoustic interaction between a) the main- and the tail rotor and, b) between the main rotor and the fuselage. The first interaction is analyzed with a numerical approach;
Ahmed, S.R., Yin, J.
openaire   +2 more sources

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Tri-quadrotor with main and secondary rotor

2020 Chinese Automation Congress (CAC), 2020
Multi-rotor aircrafts were widely used in military and civilian fields. However, the development of multirotor aircraft was limited by power and endurance time. In order to improve these problems, this paper focused on the flight module with one main rotor and three secondary rotors under the triangular frame, which can form the Unmanned Aerial Vehicle
Wei Dong, Qi Gao, Feng Pan
openaire   +1 more source

Modelling the interaction of helicopter main rotor and tail rotor wakes

The Aeronautical Journal, 2007
AbstractThe mutual interaction between the main rotor and tail rotor wakes is central to some of the most problematic dynamic phenomena experienced by helicopters. Yet achieving the ability to model the growth and propagation of helicopter rotor wakes with sufficient realism to capture the details of this interaction has been a significant challenge to
T. M. Fletcher, R. E. Brown
openaire   +1 more source

Main Rotor Yoke Cracking

1992
Abstract The 4340 steel main rotor yoke of a helicopter failed during a hovering exercise. Visual examination of the yoke revealed no evidence of gross external damage. Visual fracture surface examination, macrofractography, scanning electron micrography, and metallography of a section cut from the yoke in the region of the cracking ...
S.R. Lamb, G. Clerk
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Titanium UTTAS Main Rotor Blade

Journal of the American Helicopter Society, 1976
A description of the design philosophy leading to the development of a high performance rotor blade for the Army UTTAS helicopter is presented. The Army mission requirements of 550 fpm rate‐of‐climb at 4000 ft, 95° conditions and a 1.75 g maneuver at 150 knots translate into Figure of Merit and aeroelastic achievements beyond those of existing rotors.
Peter Arcidiacono, Robert Zincone
openaire   +1 more source

Lynx Main Rotor/Tail Rotor Interactions: Mechanisms and Modelling

Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 1994
A flight trial has been conducted by the Defence Research Agency (DRA) Bedford using a Lynx AH Mk5 helicopter fitted with an instrumented tail rotor to collect data on tail rotor aerodynamic performance. The analysis carried out to date has concentrated on the effects of main rotor wake interactions on the tail rotor. This paper describes the trial and
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Parametric structure optimization of a main rotor blade as an application for FSI analysis in main rotor optimization process

Aircraft Engineering and Aerospace Technology
Purpose Modern warfare and modern battlefield are very demanding. The recent conflicts showed that the usage of the helicopters is very limited and only the best constructions are able to provide support for the operations. The purpose of this research is to show the possibilities of new design tool for main rotor aerostructural optimization.
Jakub Kocjan, Robert Rogólski
openaire   +1 more source