Research on Tail Rotor Load Test Flight Technology for Helicopters Based on Strain Sensor Measurement. [PDF]
Sensors (Basel)Jiao S, Zheng J, Li K, Hu X.
europepmc +1 more source
Psychoacoustic Test to Determine Sound Quality Metric Indicators of Rotorcraft Noise Annoyance [PDF]
Noise certification metrics such as Effective Perceived Noise Level and Sound Exposure Level are used to ensure that helicopters meet regulations, but these metrics may not be good indicators of annoyance since noise complaints against helicopters ...
Christian, Andrew +2 more
core +1 more source
AI-Driven Adaptive Camouflage Pattern Generation for Helicopter Detection Evasion in Aerial Sensor Imagery Using Fine-Tuned YOLOv8 and Stable Diffusion. [PDF]
Sensors (Basel)Im J, Kim Y, Chun HJ, Kim K.
europepmc +1 more source
Rotorcraft research testing in the National Full-Scale Aerodynamics Complex at NASA Ames Research Center [PDF]
The unique capabilities of the National Full-Scale Aerodynamics Complex (NFAC) for testing rotorcraft systems are described. The test facilities include the 40- by 80-Foot Wind Tunnel, the 80- by 120-Foot Wind Tunnel, and the Outdoor Aerodynamic Research
Johnson, W., Smith, C. A., Warmbrodt, W.
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Construct Diversity in Measures of Helicopter Parenting in Emerging Adulthood. [PDF]
Emerg AdulthoodHoward AL, Bota S, Lamb M.
europepmc +1 more source
Assessment of worm gearing for helicopter transmissions [PDF]
A high-efficiency hydrostatic worm gear drive for helicopter transmissions is assessed. The example given is for a large cargo helicopter with three 4000-kW engines and transmission reduction ratio of 110. Also contained are: an efficiency calculation, a
Chaiko, Lev
core +1 more source
CFD-enabled sustainable design and manufacturing of cooling fan for unmanned helicopter. [PDF]
Sci RepSi L +10 more
europepmc +1 more source
Helicopter rotor trailing edge noise [PDF]
A two dimensional section of a helicopter main rotor blade was tested in an acoustic wind tunnel at close to full-scale Reynolds numbers to obtain boundary layer data and acoustic data for use in developing an acoustic scaling law and testing a first ...
Amier, R. K., Schlinker, R. H.
core +1 more source
Effects of drop net and helicopter net-gun capture on movement, space use, and survival of white-tailed deer. [PDF]
PLoS OneStewart DG +6 more
europepmc +1 more source