Advancing-side directivity and retreating-side interactions of model rotor blade-vortex interaction noise [PDF]
Acoustic data are presented from a 40 percent scale model of the four-bladed BO-105 helicopter main rotor, tested in a large aerodynamic wind tunnel.
Elliott, J. W. +3 more
core +1 more source
A flight investigation of performance and loads for a helicopter with NLR-1T main-rotor blade sections [PDF]
Data on performance and rotor loads for a teetering-rotor, AH-1G helicopter flown with a main rotor that had the NLR-1T airfoil as the blade-section contour are presented. The test envelope included hover, forward-flight speed sweeps from 35 to 85 m/sec,
Morris, C. E. K., Jr. +2 more
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CFD ANALYSIS OF THE EFFECT OF PARABOLIC TAPER DISTRIBUTION OF AN UNTWISTED HELICOPTER ROTOR BLADE
Havacılık ve Uzay Teknolojileri Dergisi, 2018 The effect of parabolic taper distribution along the span of a helicopter rotor blade is analyzed in terms of the rotor thrust, torque and Figure of Merit. Various maximum chord length values are investigated.
Munir Elfarra, Mustafa Kaya
doaj
A simulation study of active feedback supression of dynamic response in helicopter rotor blades [PDF]
A parameter study is presented for active feedback control applied to a helicopter rotor blade during forward flight. The study was performed on an electromechanical apparatus which included a mechanical model rotor blade and electronic analog simulation
Bessey, R. L., Dodge, F. T., Kana, D. D.
core +1 more source
AviationThe general objective of this paper is to present the initial results obtained as an outcome of applying a coupled Experimentally Derived – Blade Element Momentum Theory (BEMT) model for evaluating the airflow-defining parameters of a hovering ...
Gabriel Georgiev
doaj +1 more source
Conceptual design and optimization of a sustainable and environmentally friendly archetypal helicopter within the selection criteria and limitations. [PDF]
Heliyon, 2023 Gunaltili E +6 more
europepmc +1 more source
A computer program for the determination of the acoustic pressure signature of helicopter rotors due to blade thickness [PDF]
A computer program is presented for the determination of the thickness noise of helicopter rotors. The results were obtained in the form of an acoutic pressure time history.
Farassat, F., Mall, G. H.
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Kesediaan pelajar dari aspek kemahiran teknikal terhadap pembentukan kebolehkerjaan di Kolej Vokasional Wilayah Selatan [PDF]
, 2015 Graduan yang menganggur terus menjadi masalah yang semakin meruncing di Malaysia. Terdapat majikan yang menganggap kompetensi akademik sahaja tidak mencukupi dan mula meminta institusi pendidikan tinggi untuk menghasilkan graduan yang dilengkapi ...
Hanafi., Suhaili
core
Design and preliminary tests of a blade tip air mass injection system for vortex modification and possible noise reduction on a full-scale helicopter rotor [PDF]
Full-scale tests were conducted on the Langley helicopter rotor test facility as part of a study to evaluate the effectiveness of a turbulent blade tip air mass injection system in alleviating the impulsive noise (blade slap) caused by blade-vortex ...
Balcerak, J. C. +3 more
core +1 more source
Dynamic Electromagnetic Scattering Simulation of Tilt-Rotor Aircraft in Multiple Modes. [PDF]
Sensors (Basel), 2023 Fei Z, Yang Y, Jiang X, Zhao Q, Chen X.
europepmc +1 more source