Results 91 to 100 of about 51,014 (299)

NUMERICAL ANALYSIS OF HUB AND FUSELAGE INTERFERENCE TO REDUCE HELICOPTER DRAG

, 2012
A numerical investigation was carried out to predict the mutual interference between helicopter components. The investigation was based on the solution of RANS equations in three dimensions using unstructured grids.
Khier, Walid
core  

Micro‐habitat selection by boreal woodland caribou improves access to food

Wildlife Biology, EarlyView.
Bio‐logging sensors attached to radiotelemetry receivers have great potential to transform our understanding of the ecological, physiological, and energetic constraints that shape patterns of wildlife movement under field conditions. We used video camera collars to assess microhabitat selectivity by woodland caribou Rangifer tarandus in boreal forests ...
Ian D. Thompson, Philip A. Wiebe, Arthur R. Rodgers, Douglas Reid, James A. Baker, Brent R. Patterson, Eric McNeill, Romain Dejeante, John M. Fryxell   +8 more
wiley   +1 more source

Decision-making support system of civil helicopter maritime search and rescue for people in distress

Hangkong gongcheng jinzhan
Helicopter maritime search and rescue（MSAR）is one of the important components in aviation emergency rescue system. However，the MSAR unit usually analyzes distress information and makes response plans according to previous experience，which lacks the ...
CHEN Zikun
doaj   +1 more source

HELICOPTER KIT

, 2018
A kit (1) for a helicopter (2) is described, the helicopter (2) comprising a fuselage (3) and a rotor (4); the kit (1) comprises at least one device (15) adapted to dampen the vibrations transmitted from the rotor (4) to the fuselage (2) and to be interposed between the fuselage (2) and the rotor (4); the device (15), in turn, comprises a first ...
Bottasso, Luigi, Colombo, Attilio, Masarati, Pierangelo, Quaranta, Giuseppe, Tamer, Aykut   +4 more
openaire   +3 more sources

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 ...
Kelly, Mary E., Mary E. Kelly, Richard E. Brown, Brown, Richard   +3 more
core   +1 more source

Parturition timing and the pre‐ and post‐partum behaviour of female moose assessed using animal‐borne video and movement‐based approaches

Wildlife Biology, EarlyView.
Limited information on moose calving behaviour, including parturition timing, cow‐calf interactions, and pre‐ and post‐partum movement patterns hinder our ability to define calving phenology and habitat use. GPS‐collars were deployed on 89 female moose over five years, including eight collars equipped with animal‐borne video and environmental data ...
Mikaela Borgeaud LeBlanc, Manuelle Landry‐Cuerrier, Vincent Brodeur, Murray M. Humphries   +3 more
wiley   +1 more source

Design of an Adaptive Landing Gear with Ground Contact Sensing Capability

Nanjing Hangkong Hangtian Daxue Xuebao
To improve the landing capability of helicopters on complex terrain， this paper proposes an adaptive landing gear with ground contact sensing capability.
LI Qi, MIAO Hongtao, YANG Yun
doaj   +1 more source

Influence of blade aerodynamic model on the prediction of helicopter high-frequency airloads

, 2011
Brown’s vorticity transport model has been used to investigate the influence of the blade aerodynamic model on the accuracy with which the high-frequency airloads associated with helicopter blade–vortex interactions can be predicted.
Kelly, Mary E., Mary E. Kelly, Richard E. Brown, Brown, Richard   +3 more
core   +1 more source

Habitat selection of moose in Sweden in managed boreal forests with Pinus contorta and P. sylvestris

Wildlife Biology, EarlyView.
Human land use can take advantage of using exotic species to increase financial benefits. However, the use of exotic tree species might affect ecosystem functioning, potentially including the habitat use and movement behaviour of animals, modifying their ecological impact, and interactions with human land use.
Maria Bolund, Fredrik Stenbacka, Fredrik Widemo, John P. Ball, Göran Ericsson, Wiebke Neumann   +5 more
wiley   +1 more source

Research on Roller Skew Characteristics of Cylindrical Roller Bearings Based on ANSYS/LS‑DYNA

Nanjing Hangkong Hangtian Daxue Xuebao
During the high-speed operation of cylindrical roller bearings， there is a certain deflection angle between the contact line of the rollers and raceways and the bearing rotation axis.
MA Chenfei, HOU Xiangying, YANG Kai, ZHANG Hong, LI Zhengminqing   +4 more
doaj   +1 more source