Results 161 to 170 of about 75,887 (217)
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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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Herald of Khmelnytskyi National University. Technical sciences, 2020
The world’s leading engine companies carry out research and development work aimed at improving the efficiency of heat engines, their reliability and durability, reducing weight and size, improving environmental performance, reducing fuel consumption and more.
M. KOSIYUK, А. KOSIYUK
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The world’s leading engine companies carry out research and development work aimed at improving the efficiency of heat engines, their reliability and durability, reducing weight and size, improving environmental performance, reducing fuel consumption and more.
M. KOSIYUK, А. KOSIYUK
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Aircraft Engineering and Aerospace Technology, 1938
NUMEROUS difficulties are encountered in any attempt to ascertain the loads which come into action on a gyroplane rotor blade, and the stresses which these loads impose on the blade. The loads are not steady but variable, complicated and subject to intractable fluctuations. In consequence the blades are in a continual state of agitation.
J. Morris, W. Tye
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NUMEROUS difficulties are encountered in any attempt to ascertain the loads which come into action on a gyroplane rotor blade, and the stresses which these loads impose on the blade. The loads are not steady but variable, complicated and subject to intractable fluctuations. In consequence the blades are in a continual state of agitation.
J. Morris, W. Tye
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The Evolution of the Rotor Blade
Aircraft Engineering and Aerospace Technology, 1969THE helicopter presents a classic case of a device for which there is an insatiable world demand that cannot be met because the current state of engineering development prohibits an economic product. The overriding factor in any airborne vehicle is the necessity of achieving a viable payload and performance at an acceptable cost with dependable ...
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The Journal of the Acoustical Society of America, 2011
A fan rotor arrangement comprises a fan rotor ( 24 ) and a plurality of fan blades ( 26 ). Each fan blade ( 26 ) comprises a root portion ( 36 ) and an aerofoil portion ( 38 ). Each aerofoil portion ( 38 ) has a leading edge ( 44 ), a trailing edge ( 46 ) and a tip ( 48 ).
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A fan rotor arrangement comprises a fan rotor ( 24 ) and a plurality of fan blades ( 26 ). Each fan blade ( 26 ) comprises a root portion ( 36 ) and an aerofoil portion ( 38 ). Each aerofoil portion ( 38 ) has a leading edge ( 44 ), a trailing edge ( 46 ) and a tip ( 48 ).
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Journal of the Aeronautical Sciences, 1942
T FACTORS THAT AFFECT the design of flexibly mounted rotor blades—that is, blades incorporating horizontal and vertical hinges—are practically the same for autorotat ing rotors and power-driven rotors insofar as knowledge of power-driven rotors has progressed to date. The design of rotor blades may be divided into two par t s : (a) determination of the
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T FACTORS THAT AFFECT the design of flexibly mounted rotor blades—that is, blades incorporating horizontal and vertical hinges—are practically the same for autorotat ing rotors and power-driven rotors insofar as knowledge of power-driven rotors has progressed to date. The design of rotor blades may be divided into two par t s : (a) determination of the
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Journal of the Aeronautical Sciences, 1947
THE PROBLEM of determining bending moments in rotor blades is a fundamental one in the design of rotating wing aircraft. Several methods for solving the problem have been proposed, both empirical and theoretical. In general, the theoretical methods have been so involved that most blade designers have had to take recourse to empirical or semiempirical ...
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THE PROBLEM of determining bending moments in rotor blades is a fundamental one in the design of rotating wing aircraft. Several methods for solving the problem have been proposed, both empirical and theoretical. In general, the theoretical methods have been so involved that most blade designers have had to take recourse to empirical or semiempirical ...
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A review of composite rotor blade modeling
29th Structures, Structural Dynamics and Materials Conference, 1988Analyses applicable to composite helicopter rotor blades are reviewed. Important features of such analyses include transverse shear deformation, torsional warping, and nonlinearities associated with large displacement and rotation of the reference cross section.
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Robot for rotor blade inspection
2010 1st International Conference on Applied Robotics for the Power Industry, 2010Rotor blades of wind energy converters are highly stressed components subject to constant load cycles. Regular inspections of rotor blades are indispensible for reliable operation and cost effective production without longer downtimes. Insurers and lenders demand routine inspection of rotor blades every two years.
Norbert Elkmann +2 more
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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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