An Exploratory Investigation of the Flight Dynamics Effects of Rotor Rpm Variations and Rotor State Feedback in Hover PDF Download
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Author:
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Category :
Languages : en
Pages : 48
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722069940
Category :
Languages : en
Pages : 46
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This paper presents the results of an analytical study conducted to investigate airframe/engine interface dynamics, and the influence of rotor speed variations on the flight dynamics of the helicopter in hover, and to explore the potential benefits of using rotor states as additional feedback signals in the flight control system. The analytical investigation required the development of a parametric high-order helicopter hover model, which included heave/yaw body motion, the rotor speed degree of freedom, rotor blade motion in flapping and lead-lag, inflow dynamics, a drive train model with a flexible rotor shaft, and an engine/rpm governor. First, the model was used to gain insight into the engine/drive train/rotor system dynamics and to obtain an improved simple formula for easy estimation of the dominant first torsional mode, which is important in the dynamic integration of the engine and airframe system. Then, a linearized version of the model was used to investigate the effects of rotor speed variations and rotor state feedback on helicopter flight dynamics. Results show that, by including rotor speed variations, the effective vertical damping decreases significantly from that calculated with a constant speed assumption, thereby providing a better correlation with flight test data. Higher closed-loop bandwidths appear to be more readily achievable with rotor state feedback. The results also indicate that both aircraft and rotor flapping responses to gust disturbance are significantly attenuated when rotor state feedback is used. Chen, Robert T. N. Ames Research Center RTOP 505-59-36...
Author:
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Category : Aeronautics
Languages : en
Pages : 704
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Category : Government publications
Languages : en
Pages :
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Author: Stanford University. Department of Aeronautics and Astronautics
Publisher:
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Category :
Languages : en
Pages : 246
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1592
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 504
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Author:
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ISBN:
Category :
Languages : en
Pages : 392
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 580
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A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)
Author: American Helicopter Society
Publisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 628
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