Results 121 to 130 of about 15,084 (235)
Acoustically swept rotor [PDF]
, 1979 Impulsive noise reduction is provided in a rotor blade by acoustically sweeping the chord line from root to tip so that the acoustic radiation resulting from the summation of potential singularities used to model the flow about the blade tend to cancel ...
Boxwell, D. A. +2 more
core +1 more source
Design of mold for helicopter composite rotor blade [PDF]
, 2006 This paper shows CAD/CAM programming technique of mold recess for helicopter main rotor blade. It is necessary to achieve high precision in this process. Due to the dimensions along one of the blade axis, the segmented mold is found necessary. In this paper the programming procedure is shown for one of these mold segments.
Simonović, Aleksandar +1 more
openaire
Manoeuvrability assessment of a hybrid compound helicopter configuration [PDF]
, 2014 The compound helicopter design could potentially satisfy the new emerging requirements placed on the next generation of rotorcraft. The main benefit of the compound helicopter is its ability to reach speeds that significantly surpass the conventional ...
Ferguson, Kevin, Thomson, Douglas
core
Sand Erosion Resistance and Failure Mechanism of Polyurethane Film on Helicopter Rotor Blades. [PDF]
Polymers (Basel), 2023 Zheng L, Fan J, Gong Q, Sun W, Jia X.
europepmc +1 more source
A Quiet Helicopter for Air Taxi Operations [PDF]
NASA is exploring rotorcraft designs for VTOL air taxi operations, also known as urban air mobility (UAM) or on-demand mobility (ODM) applications. Several concept vehicles have been developed, intended to focus and guide NASA research activities in ...
Johnson, Wayne
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A Single Oscillator-Excited Piezoelectric Actuator with Internal Contact Teeth. [PDF]
Micromachines (Basel), 2023 Fang D +7 more
europepmc +1 more source
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.
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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.
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Helicopter Main Rotor Blade Parametric Design for a Preliminary Aerodynamic Analysis Supported by CFD or Panel Method. [PDF]
Materials (Basel), 2022 Kocjan J, Kachel S, Rogólski R.
europepmc +1 more source
Euler solution of multiblade rotor flow [PDF]
A numerical method for solving the Euler equations for multiblade rotors has been developed and some preliminary results reported. The numerical scheme is a combination of several recent methods and algorithm improvements, adapted to the particular ...
Chen, C. L. +2 more
core +1 more source