Results 91 to 100 of about 75,702 (263)

RESEARCH OF THE HIGH HARMONICS INDIVIDUAL BLADE CONTROL EFFECT ON VIBRATIONS CAUSED BY THE HELICOPTER MAIN ROTOR THRUST

Научный вестник МГТУ ГА, 2017
The paper presents numerical results analysis of main rotor vibration due to helicopter main rotor thrust pulsation.The calculation method, the object of research and numerical research results with the aim to reduce the amplitude of the vibrations ...
B. S. Kritsky, R. M. Mirgazov, Le Van Chung   +2 more
doaj  

The Frequency-Variable Rotor-Blade-Based Two-Degree-of-Freedom Actuation Principle for Linear and Rotary Motion. [PDF]

Sensors (Basel), 2023
Li X, Wang S, Peng X, Xu G, Dong J, Tian F, Zhang Q.   +6 more
europepmc   +1 more source

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

The Wind of Change: Mapping Wind Energy Growth and Multi‐Species Vulnerability in Sardinia, Mediterranean

Animal Conservation, EarlyView.
The rapid expansion of wind energy across the Mediterranean region calls for more advanced tools to assess and mitigate its impacts on biodiversity. In this study, we present an innovative approach combining 13‐year satellite imagery analysis and ecological modelling, to assess the spatiotemporal overlap between wind energy development and habitat ...
Chiara Costantino, Jacopo Cerri, Ilaria Fozzi, Davide De Rosa, Fiammetta Berlinguer   +4 more
wiley   +1 more source

Aerodynamically Efficient Rotor Design for Hovering Agricultural Unmanned Helicopter

Journal of Applied Fluid Mechanics, 2017
Unmanned aerial vehicles, especially agricultural unmanned helicopters (AUH), are nowadays extensively used in precision agriculture. AUHs have recently become responsible for spraying fertilizers and pesticides for crop yields.
B. A. Haider, C. H. Sohn, Y. S. Won, Y. M. Koo   +3 more
doaj  

Helicopter Main Rotor Blade Parametric Design for a Preliminary Aerodynamic Analysis Supported by CFD or Panel Method. [PDF]

Materials (Basel), 2022
Kocjan J, Kachel S, Rogólski R.
europepmc   +1 more source

Stall induced instability of a teetered rotor [PDF]

Recent tests on the 38m Mod-0 horizontal experimental wind turbine yielded quantitative information on stall induced instability of a teetered rotor. Tests were conducted on rotor blades with NACA 230 series and NACA 643-618 airfoils at low rotor speeds ...
Corrigan, R. D., Glasgow, J. C.
core   +1 more source

Dynamic Capabilities as Drivers of Circular Business Models: Exploring Direct and Indirect Relationships

Journal of Product Innovation Management, EarlyView.
ABSTRACT Academic Summary Despite the urgent need for a circular economy, firms' transition from linear to circular business models (CBMs) remains slow. While previous research suggests that dynamic capabilities are the key drivers of this transition, it assumes a direct link, overlooking that these capabilities can facilitate change but do not ...
Jörn Block, Thomas Clauss, Matheus Franco, Timo Lemcke, Hubert Speth   +4 more
wiley   +1 more source

2-D CFD Computations of the Two-Bladed Darrieus-Type Wind Turbine

Journal of Applied Fluid Mechanics, 2018
In spite of the attractiveness of CFD methods and advanced measurement methods, there is still no full analysis of aerodynamic blade loads for vertical axis Darrieus-type wind turbines.
K. Rogowski, M. O. L. Hansen, P. Lichota
doaj  

Wake characteristics of a freely rotating bioinspired swept rotor blade. [PDF]

R Soc Open Sci, 2021
Nafi AS, Krishnan K, Debnath AK, Hackett EE, Gurka R.   +4 more
europepmc   +1 more source