Results 191 to 200 of about 66,325 (272)
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A review of helicopter rotor blade tip shapes
Progress in Aerospace Sciences, 2013A. Brocklehurst, G. Barakos
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The Journal of the Acoustical Society of America, 1993
Flow separation behind the notch region of a swept tip of a helicopter rotor blade is reduced by features of the geometry and aerodynamic characteristics of the notch region itself. In particular it has been found beneficial for a forwardly swept leading edge portion to extend at an angle between 30 degrees and 55 degrees from a reference line parallel
Frederick J. Perry, Alan Brocklehurst
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Flow separation behind the notch region of a swept tip of a helicopter rotor blade is reduced by features of the geometry and aerodynamic characteristics of the notch region itself. In particular it has been found beneficial for a forwardly swept leading edge portion to extend at an angle between 30 degrees and 55 degrees from a reference line parallel
Frederick J. Perry, Alan Brocklehurst
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Journal of Intelligent Materials Systems and Structures, 2019
The present study proposes and explores a new autonomous morphing concept, where a 12–13° increase in camber is realized over a spanwise section of a helicopter rotor blade with increase in ambient temperature.
Matthew DiPalma, F. Gandhi
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The present study proposes and explores a new autonomous morphing concept, where a 12–13° increase in camber is realized over a spanwise section of a helicopter rotor blade with increase in ambient temperature.
Matthew DiPalma, F. Gandhi
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Assessment of Comprehensive Analysis Predictions of Helicopter Rotor Blade Loads in Forward Flight
Proceedings of the Vertical Flight Society 72nd Annual Forum, 2016Comparisons of helicopter rotor blade loads, between rotorcraft comprehensive analysis predictions using a free vortex wake model and measured data, are provided for the UH-60A, SA 330 (research Puma), SA 349/2, and H-34 rotors in forward flight.
J. Ho, Nbsp, H. Yeo
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Helicopter Main and Tail Rotor Blade Parameter Extraction Using Micro-Doppler
International Radar Symposium, 2018The rotating structures on an airborne target cause additional Doppler modulation in the return signal which is known as the micro-Doppler effect. Information regarding the rotating structures can be extracted from this effect.
Prajakta Sathe +4 more
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Design and analysis of helicopter rotor blades
International Journal of Science and Research Archive, 2023Rotor blades of helicopters must be stiff and strong enough to maintain structural loads within working limits. The rotating cycles change the aerodynamic and structural stresses created by the blade revolution. In this project, you will discover the structural stresses of the blades as well as the vibration frequencies studied using the Ansys ...
null Kolli Ramesh +2 more
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Helicopter Rotor Blade Radar Antenna
Journal of the American Helicopter Society, 1966The helicopter main rotor blade can be used as a scanning radar antenna. Its large aperture gives a narrow azimuth beam‐width and the natural rotor scanning motion provides a fast scan. It is much lighter than conventional antennas and since it is integral with the rotor blade, it induces no additional drag.
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Apparatus for damping helicopter rotor blade oscillations
The Journal of the Acoustical Society of America, 1990A major design consideration in helicopters is that of compensating for ssses on blades resulting from air forces during blade revolutions. Spinning rotor blades are severely stressed. To some degree conventional articulated helicopter rotor hubs overcome vibration difficulties, but high maintenance is a problem.
David G. Matuska, Donald L. Ferris
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1973
The development of fiber reinforced resin-bonded structural composite materials has created a new degree of design flexibility for the helicopter engineer. The development and commercial availability of glass fibers, carbon or graphite fibers, and boron fibers, with their attendant widely varying stiffness properties and material densities, enable the ...
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The development of fiber reinforced resin-bonded structural composite materials has created a new degree of design flexibility for the helicopter engineer. The development and commercial availability of glass fibers, carbon or graphite fibers, and boron fibers, with their attendant widely varying stiffness properties and material densities, enable the ...
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Helicopter Rotor Blade Flapping and Bending
Aircraft Engineering and Aerospace Technology, 1957THE problem of calculating the motion of a helicopter blade presents many difficulties. Probably the most serious is the lack of knowledge of the aerodynamic forces acting on a blade, but a second major difficulty arises when the equations of motion have to be solved.
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