NDLI: Integrated technology rotor/flight research rotor concept definition study

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Integrated technology rotor/flight research rotor concept definition study

Content Provider	NASA Technical Reports Server (NTRS)
Author	Beno, E. A. Carlson, R. G. Ulisnik, H. D.
Copyright Year	1983
Description	As part of the Integrated Technology Rotor/Flight Research Rotor (ITR/FRR) Program a number of advanced rotor system designs were conceived and investigated. From these, several were chosen that best meet the started ITR goals with emphasis on stability, reduced weight and hub drag, simplicity, low head moment stiffness, and adequate strength and fatigue life. It was concluded that obtaining low hub moment stiffness was difficult when only the blade flexibility of bearingless rotor blades is considered, unacceptably low fatigue life being the primary problem. Achieving a moderate hub moment stiffness somewhat higher than state of the art articulated rotors in production today is possible within the fatigue life constraint. Alternatively, low stiffness is possible when additional rotor elements, besides the blades themselves, provide part of the rotor flexibility. Two primary designs evolved as best meeting the general ITR requirements that presently exist. An I shaped flexbeam with an external torque tube can satisfy the general goals but would have either higher stiffness or reduced fatigue life. The elastic gimbal rotor can achieve a better combination of low stiffness and high fatigue life but would be a somewhat heavier design and possibly exhibit a higher risk of aeromechanical instability.
File Size	4237976
Page Count	92
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19850010671
Archival Resource Key	ark:/13960/t0sr3q92b
Language	English
Publisher Date	1983-03-01
Access Restriction	Open
Subject Keyword	Aircraft Design, Testing And Performance Functional Design Specifications Fatigue Life Gimbals Uh-60a Helicopter Bearingless Rotors Stiffness Vulnerability Hubs Helicopter Design Rotary Wings Figure of Merit Pitch Inclination Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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