Results 211 to 220 of about 74,669 (264)
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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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Titanium UTTAS Main Rotor Blade
Journal of the American Helicopter Society, 1976A description of the design philosophy leading to the development of a high performance rotor blade for the Army UTTAS helicopter is presented. The Army mission requirements of 550 fpm rate‐of‐climb at 4000 ft, 95° conditions and a 1.75 g maneuver at 150 knots translate into Figure of Merit and aeroelastic achievements beyond those of existing rotors.
Peter Arcidiacono, Robert Zincone
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2016
Previous chapters have focused on rotating beams with only the out-of-plane motion. In this chapter, we study rotating blades which have in-plane bending, torsion and axial degrees of freedom. Rotor blades are essential and critical components of helicopters, turbines, compressors and other rotatory machinery (Xiong and Yu, J Sound Vib 302(4–5):821–840,
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Previous chapters have focused on rotating beams with only the out-of-plane motion. In this chapter, we study rotating blades which have in-plane bending, torsion and axial degrees of freedom. Rotor blades are essential and critical components of helicopters, turbines, compressors and other rotatory machinery (Xiong and Yu, J Sound Vib 302(4–5):821–840,
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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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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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Increased Rotor Blade Survivability
1975Abstract : Reported are results of a program to investigate the feasibility of using composite geodesic structure for the blade spar to increase survivability of helicopter main rotor blades. The design investigated consists of a geodesic truss structure spare of elliptical cross section comprised of elements forming a redundant grid-work. This spar is
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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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1997
Exploiting wind energy has been around since remote times: the Dutch began in 1360 with the typical mill to drain the marshland and for the more traditional agricultural work. In the past 30 years, material technological progress has brought on the construction of aerogenerators that range from an average 100 HP to the American aerogenerator of Grandpa’
DI MARIA, Francesco +2 more
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Exploiting wind energy has been around since remote times: the Dutch began in 1360 with the typical mill to drain the marshland and for the more traditional agricultural work. In the past 30 years, material technological progress has brought on the construction of aerogenerators that range from an average 100 HP to the American aerogenerator of Grandpa’
DI MARIA, Francesco +2 more
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Jet-Propelled Rotor-Blade Construction
The Journal of the Helicopter Association of Great Britain, 1951In presenting this paper an attempt has been made to outline some of the additional problems which are connected with the design and construction of rotor blades driven by jets at the tipsThe complications which arise when ram or pulse jets are fitted are not discussed in detail as it is considered that these problems are also included among those ...
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