Noise produced by turbulent flow into a rotor: Theory manual for atmospheric turbulence prediction and mean flow and turbulence contraction prediction [PDF]
Prediction of helicopter main rotor noise due to ingestion of atmospheric turbulence was analyzed. The analysis combines several different models that describe the fluid mechanics of the turbulence and the ingestion process.
Simonich, J. C.
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Helicopter noise regulations: An industry perspective [PDF]
A review of helicopter noise measurement programs and noise reduction/economic studies of FAA is given along with a critique of a study which addresses the economic impact of noise reduction on helicopter noise.
Wagner, R. A.
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Nonlinear controller design for unmanned helicopter flight platform. [PDF]
Sci RepRuchun W.
europepmc +1 more source
Generalized helicopter rotor performance predictions.
, 1977 The Generalized Rotor Performance (GRP) program is a computer program designed for calculating forward flight performance of a helicopter rotor system at a specific flight condition. It can be used to evaluate either an articulated or a hingeless single rotor system in forward flight or in a wind-tunnel test.
openaire +1 more source
Micro-Doppler radar deception and camouflage of airborne targets. [PDF]
Sci RepKozlov V +6 more
europepmc +1 more source
The elaboration of a new family of helicopter blade profiles [PDF]
An airfoil family of helicopter rotor blades was designed. Three airfoils with thickness to chord ratios of 12, 9, and 7% were designed. Their improved performance in two dimensional rotor mockup wind tunnel tests led to testing of the tapered blades on ...
Thibert, J. J.
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Impact of Helicopter Vibrations on In-Ear PPG Monitoring for Vital Signs-Mountain Rescue Technology Study (MoReTech). [PDF]
Sensors (Basel)Benkert A +4 more
europepmc +1 more source
Rotor aeroelastic stability coupled with helicopter body motion [PDF]
A 5.5-foot-diameter, soft-in-plane, hingeless-rotor system was tested on a gimbal which allowed the helicopter rigid-body pitch and roll motions. Coupled rotor/airframe aeroelastic stability boundaries were explored and the modal damping ratios were ...
Huber, H. B., Miao, W. L.
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Research on power flow of encased differential gear train in coaxial contra-rotating gearbox. [PDF]
Sci RepZhang D, Zhu R, Zhang W, Cui J, Ma L.
europepmc +1 more source
A summary of rotor-hub bending moments encountered by a high performance hingeless- rotor helicopter during nap-of-the-earth maneuvers [PDF]
Rotor-hub bending moment measurements on hingeless rotor helicopter during abrupt maneuvers near ...
Snyder, W. J.
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