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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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Dynamic characteristics of rotor blades
Journal of Sound and Vibration, 1976Abstract The transmission matrix method is used to determine the dynamic characteristics (natural frequencies and the associated mode shapes) of rotor blades. The problems treated are combined flapwise bending, chordwise bending, and torsion of twisted non-uniform blades and its special subcases.
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Jet Propulsion of Rotor Blades
The Journal of the Helicopter Association of Great Britain, 1950From the very beginning of helicopter development the designer has had two major problems, one associated with the balancing of the torque reaction on a mechanically driven rotating system, and the other one that of mechanical difficulties associated with the transmissions ISACCO for instance realized right at the beginning that what he wanted was some
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