Results 91 to 100 of about 189,925 (269)
Coupled flight dynamics and CFD - demonstration for helicopters in shipborne environment [PDF]
, 2017 The development of high-performance computing and computational fluid dynamics methods have evolved to the point where it is possible to simulate complete helicopter configurations with good accuracy.
Barakos, G.N., Crozon, C., Steijl, R.
core +1 more source
Monitoring GPS‐collared moose by ground versus drone approaches: efficiency and disturbance effects
Wildlife Biology, EarlyView.Efficient wildlife management requires precise monitoring methods, for example to estimate population density, reproductive success, and survival. Here, we compared the efficiency of drone (equipped with a RGB camera) and ground approaches to detect and observe GPS‐collared female moose Alces alces and their calves. We also quantified how drone (n = 42)
Martin Mayer +8 more
wiley +1 more source
New Progress in Research on Dynamic Stall of Helicopter Rotors
Nanjing Hangkong Hangtian Daxue XuebaoFor over half a century， rotor dynamic stall has remained a key research focus and challenge in helicopter aerodynamics. Through persistent and in-depth exploration， researchers have achieved significant progress in measurement and prediction of rotor ...
JING Simeng +4 more
doaj +1 more source
A Novel Model-Free Robust Control of Cable-Driven Manipulators
IEEE Access, 2019 A novel model-free robust control is developed for cable-driven manipulators in this work. Using the time-delay estimation (TDE) to estimate system dynamics, an attractive model-free structure is ensured.
Yaoyao Wang +4 more
doaj +1 more source
Aerospatiale is ready to develop a convertiplane with tethering rotors [PDF]
Information on the recent study of the convertiplane is reported. The convertiplane was designed to replace the conventional helicopter. Its speed is much faster than that of the helicopter, it uses less fuel, and can carry up to five passengers.
Morisset, J.
core +1 more source
Wildlife Biology, EarlyView.Resource managers require accurate estimates of large herbivore abundance and demography to maintain ecological integrity. Common methods to count these species, including observations from low altitude helicopter flights, may conflict with other protected area management objectives and struggle to produce precise estimates for more cryptic species. To
Hanem G. Abouelezz, N. Thompson Hobbs
wiley +1 more source
Effects of Leading Edge Radius on Stall Characteristics of Rotor Airfoil
AerospaceThe effects of leading edge radius on the static and dynamic stall characteristics of rotor airfoils are investigated. Initially, a parametric airfoil (PARFOIL) method is employed to generate four morphed airfoils with different leading edge radii based ...
Simeng Jing +3 more
doaj +1 more source
Results of the flight noise measurement program using a standard and modified SH-3A helicopter [PDF]
A field noise measurement program has been conducted using both a standard SH-3A helicopter and an SH-3A helicopter modified to reduce external noise levels.
Henderson, H. R. +2 more
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Development of an unsteady aerodynamics model to improve correlation of computed blade stresses with test data [PDF]
, 1985 A reliable rotor aeroelastic analysis operational that correctly predicts the vibration levels for a helicopter is utilized to test various unsteady aerodynamics models with the objective of improving the correlation between test and theory.
Gangwani, S. T.
core +1 more source
Annual survival in a dynamic species: pronghorn survival patterns across their northern range
Wildlife Biology, EarlyView.Quantifying variation in demographic patterns, such as survival and recruitment, is critical for understanding population dynamics and informing evidence‐based and adaptive wildlife management. In this study, we leverage an extensive dataset from over 1000 GPS collared pronghorn Antilocapra americana to provide the first large‐scale evaluation of ...
Molly C. McDevitt +5 more
wiley +1 more source