Results 41 to 50 of about 15,084 (235)

Hingeless helicopter rotor with improved stability [PDF]

, 1976
Improved stability was provided in a hingeless helicopter rotor by inclining the principal elastic flexural axes and coupling pitching of the rotor blade with the lead-lag bending of the blade.
Bousman, W. G., Hodges, D. H., Ormiston, R. A., Peters, D. A.   +3 more
core   +1 more source

Dynamic Stall Characteristics of Thick Wind Turbine Airfoils

Wind Energy, Volume 28, Issue 11, November 2025.
ABSTRACT This paper studies the dynamic stall characteristics of thick flatback and nonflatback wind turbine airfoils. Two airfoils with a maximum thickness of 35%$$ 35\% $$ were studied, with trailing edge thicknesses of 2%$$ 2\% $$ and 10%$$ 10\% $$, respectively.
Mehdi Doosttalab, Carlos Simao Ferreira, Daniele Ragni, Wei Yu, Christof Rautmann   +4 more
wiley   +1 more source

Design and Aerodynamic Authority Analysis of ContinuousTrailing-edge Flap for Helicopter Blade

Hangkong gongcheng jinzhan, 2018
Continuous trailing-edge flap has many advantages over conventional discrete flap in helicopter rotor vibration reduction applications, such as light weight, compact structure and stable airflow. Macro fiber composite is chosen as the actuating material.
Li Yun, Dong Linghua, Zhou Jinlong, Yang Weidong   +3 more
doaj   +1 more source

Investigating the Level of Fidelity of an Actuator Line Model in Predicting Loads and Deflections of Rotating Blades under Uniform Free-Stream Flow

Applied Sciences, 2021
In this paper, the accuracy of an in-house Actuator Line (AL) model is tested on aeroelastic simulations of a Wind Turbine (WT) rotor and a helicopter Main Rotor (MR) under uniform free-stream flow.
Nikos Spyropoulos, George Papadakis, John M. Prospathopoulos, Vasilis A. Riziotis   +3 more
doaj   +1 more source

Failure of a Helicopter Main Rotor Blade

Procedia Materials Science, 2014
AbstractA military helicopter crash was investigated. The aircraft was flying at cruise speed in clear sky at 1000 feet over a flat area. The crew suddenly lost the control of the helicopter that crashed in the immediately causing fatal injuries to the whole crew.
Amura, Mikael, Aiello, Lorenzo, Colavita, Mario, De Paolis, Fabrizio, Bernabei, Manuele   +4 more
openaire   +1 more source

Influence of blade aerodynamic model on prediction of helicopter rotor aeroacoustic signatures [PDF]

, 2011
Brown’s vorticity transport model has been used to investigate how the local blade aerodynamic model influences the quality of the prediction of the high-frequency airloads associated with blade–vortex interactions, and thus the accuracy with which the ...
Boyd D. D., Farassat F., Kelly M. E., Kelly M. E., Kelly M. E., Lim J. W., Lim J. W., Mary E. Kelly, Pengel K., Richard E. Brown, Schneider O., Toro E. F., van der Wall B. G., Whitehouse G., Yu Y. H.   +14 more
core   +1 more source

The Effect of Rotor Size on the Teeter Behavior of Two‐Bladed Wind Turbines

Wind Energy, Volume 28, Issue 11, November 2025.
ABSTRACT The rotor of a two‐bladed turbine allows the implementation of an additional degree of freedom around the rotating hub y‐axis. This idea is over 60 years old, and various research and commercial turbines have had a teeter hinge. Fatigue and extreme loads can be reduced significantly with a teeter hinge. Teetered turbines have been mainly below
Fabian Bölle né Anstock, Vera Schorbach   +1 more
wiley   +1 more source

Full-Field Displacement Measurements of Helicopter Rotor Blades Using Stereophotogrammetry

International Journal of Aerospace Engineering, 2021
This study presents a stereophotogrammetry approach to achieve full-field displacement measurements of helicopter rotor blades. The method is demonstrated in the wind tunnel test of a 2 m diameter rotor, conducted at the 5.5 m×4 m Aeroacoustic Wind ...
Chenglin Zuo, Chunhua Wei, Jun Ma, Tingrui Yue, Lei Liu, Zheyu Shi   +5 more
doaj   +1 more source

Mitigation of infusion and cure‐induced defects for thick thermosetting composites: Current challenges and future trends

Polymer Composites, Volume 46, Issue S1, Page S9-S25, 10 September 2025.
Typical manufacturing defects and mitigation strategies in thick thermosetting composites. Abstract The composite part industry is currently dominated by thin‐section geometries. However, thick composites gain interest in many applications where monolithic parts are required, such as foils, wind mill root blades, and so forth.
Francesco Taddei, Giacomo Struzziero, Véronique Michaud   +2 more
wiley   +1 more source

Linearly variable chord-extension morphing for helicopter rotor blades [PDF]

CEAS Aeronautical Journal, 2019
AbstractA new morphing concept called linearly variable chord extension was studied for its effectiveness in improving the efficiency of a helicopter rotor. Apart from chord extension itself, an additional feature which is deflection of the extended part of the chord resulting in an effective camber and additional twist to the airfoil, is also studied ...
Majeti, Rohin Kumar, van der Wall, Berend G., Balzarek, Christoph   +2 more
openaire   +3 more sources