Results 121 to 130 of about 30,459 (234)

Wind tunnel investigations of model rotor noise at low tip speeds [PDF]

Experimental and related analytical results on model rotor rotational and broadband noise obtained in the anechoic wind tunnel and rotor facility are summarized.
Aravamudan, K. S., Harris, W. L., Lee, A.   +2 more
core   +1 more source

Nonlinear controller design for unmanned helicopter flight platform. [PDF]

Sci Rep
Ruchun 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

Study for prediction of rotor/wake/fuselage interference. Part 2: Program users guide [PDF]

A method was developed which permits the fully coupled calculation of fuselage and rotor airloads for typical helicopter configurations in forward flight.
Clark, D. R., Maskew, B.
core   +1 more source

CFD-enabled sustainable design and manufacturing of cooling fan for unmanned helicopter. [PDF]

Sci Rep
Si L, Liu Z, Xiao N, Zhang Y, Liu Y, Deng S, Li Y, Yang H, Zhang X, Fu G, Choi JP.   +10 more
europepmc   +1 more source

A real-time digital computer program for the simulation of a single rotor helicopter [PDF]

A computer program was developed for the study of a single-rotor helicopter on the Langley Research Center real-time digital simulation system. Descriptions of helicopter equations and data, program subroutines (including flow charts and listings), real ...
Gibson, L. H., Houck, J. A., Steinmetz, G. G.   +2 more
core   +1 more source

Micro-Doppler radar deception and camouflage of airborne targets. [PDF]

Sci Rep
Kozlov V, Sheleg A, Vovchuk D, Melnitsky R, Glam A, Boag A, Ginzburg P.   +6 more
europepmc   +1 more source

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.
core   +1 more source

Research on power flow of encased differential gear train in coaxial contra-rotating gearbox. [PDF]

Sci Rep
Zhang D, Zhu R, Zhang W, Cui J, Ma L.
europepmc   +1 more source

Impact of Helicopter Vibrations on In-Ear PPG Monitoring for Vital Signs-Mountain Rescue Technology Study (MoReTech). [PDF]

Sensors (Basel)
Benkert A, Bludau J, Boborzi L, Prueckner S, Schniepp R.   +4 more
europepmc   +1 more source