Correlation of Airloads on a Two-bladed Helicopter Rotor PDF Download
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Author: Francisco J. Fernandez
Publisher:
ISBN:
Category : Rotors (Helicopters)
Languages : en
Pages : 32
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Book Description
Author: Francisco J. Fernandez
Publisher:
ISBN:
Category : Rotors (Helicopters)
Languages : en
Pages : 32
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Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722132132
Category :
Languages : en
Pages : 30
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Book Description
Airloads measured on a two-bladed helicopter rotor in flight during the Ames' Tip Aerodynamic and Acoustic Test are compared with calculations from a comprehensive helicopter analysis (CAMRAD/JA), and the pressures compared with calculations from a full-potential rotor code (FPR). The flight-test results cover an advance ratio range of 0.19 to 0.38. The lowest-speed case is characterized by the presence of significant blade-vortex interactions. Good correlation of peak-to-peak vortex-induced loads and the corresponding pressures is obtained. Results of the correlation for this two-bladed rotor are substantially similar to those for three- and four-bladed rotors, including the tip-vortex core size for best correlation, calculation of the peak-to-peak loads on the retreating side, and calculation of vortex iduced loads on inboard radial stations. The higher-speed cases are characterized by the presence of transonic flow on the outboard sections of the blade. Comparison of calculated and measured airloads on the advancing side is not considered appropriate because the presence of shocks makes chordwise integration of the measured data difficult. However, good correlation of the corresponding pressures is obtained. Fernandez, Francisco J. and Johnson, Wayne Ames Research Center RTOP 505-59-36...
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 956
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 716
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Author: United States. Congress. House. Committee on Appropriations
Publisher:
ISBN:
Category :
Languages : en
Pages : 856
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 318
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Book Description
Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 262
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Book Description
The lack of progress in understanding the physics of rotorcraft loads and vibration over the last 30 years is addressed in this paper. As befits this extraordinarily difficult problem, the reasons for the lack of progress are complicated and difficult to ascertain. It is proposed here that the difficulty lies within at least three areas: 1) a loss of perspective as to what are the key factors in rotor loads and vibration, 2) the overlooking of serious unsolved problems in the field, and 3) cultural barriers that impede progress. Some criteria are suggested for future research to provide a more concentrated focus on the problem.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 962
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Book Description
Author: Jeffrey L. Cross
Publisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 472
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Book Description
