Results 121 to 130 of about 30,676 (232)

Application of Artificial Neural Networks to a Model of a Helicopter Rotor Blade for Damage Identification in Realistic Load Conditions. [PDF]

Sensors (Basel)
Ballarin P, Sala G, Macchi M, Roda I, Baldi A, Airoldi A.   +5 more
europepmc   +1 more source

Engine/airframe interface dynamics experience [PDF]

Problems of engine/drive system torsional stability, engine and output shaft critical speeds, and engine vibration at helicopter rotor order frequencies are discussed, and test data and analyses presented.
Fredrickson, C.
core   +1 more source

Rotor performance characteristics from an aeroacoustic helicopter wind-tunnel test program [PDF]

An investigation of helicopter rotor noise at model scale was conducted in the Langley 4 by 7 meter tunnel. The program described was the first of a planned three-phase project whose purpose was to examine the characteristic noise mechanism involved in ...
Elliott, J. W., Hoad, D. R., Orie, N. M.
core   +1 more source

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

Sci Rep
Ruchun W.
europepmc   +1 more source

Coupled rotor-body equations of motion hover flight [PDF]

A set of linearized equations of motion to predict the linearized dynamic response of a single rotor helicopter in a hover trim condition to cyclic pitch control inputs is described.
Curtiss, H. C., Jr., Mckillip, R. M., Jr.   +1 more
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

Integration of dynamic, aerodynamic, and structural optimization of helicopter rotor blades [PDF]

Summarized here is the first six years of research into the integration of structural, dynamic, and aerodynamic considerations in the design-optimization process for rotor blades.
Peters, David A.
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

A laboratory study of the subjective response to helicopter blade-slap noise [PDF]

The test stimuli recorded during a recent field study consisted of 16 sounds, each presented at 4 peak noise levels. Two helicopters and a fixed-wing aircraft were used.
Shepherd, K. P.
core   +1 more source

Fixed-wing air transport of patients with spinal pathologies: a scoping review of current evidence and future research priorities. [PDF]

Acta Neurochir (Wien)
Thamilmaran A, Hodgson Z, Peramatzis K, Karampouga M, Jarratt M, Tsianaka E, Janssen IK, Tasiou A, Keser N, Murphy M.   +9 more
europepmc   +1 more source