Aeromechanical stability of a hingeless rotor in hover and forward flight : analysis and wind tunnel tests / William T. Yeager, Jr., M-Nabil H. Hamouda, Wayne R. Mantay.

Format:

Book

Government document

Author/Creator:

Yeager, William T., author.

Hamouda, M-Nabil H., author.

Mantay, Wayne R., author.

Army Research and Technology Laboratories (U.S.). Structures Laboratory, author.

Contributor:

Army Research and Technology Laboratories (U.S.). Structures Laboratory, author.

Langley Research Center, issuing body.

United States. National Aeronautics and Space Administration, sponsoring body.

United States. Army Aviation Research and Development Command, sponsoring body.

Series:

NASA technical memorandum ; 85683.

AVRADCOM technical report ; 83-B-5.

NASA technical memorandum ; 85683

AVRADCOM technical report ; 83-B-5

Language:

English

Physical Description:

1 online resource (19 pages) : illustrations.

Place of Publication:

Hampton, Virginia : National Aeronautics and Space Administration, Langley Research Center, August 1983.

Summary:

A research effort of analysis and testing has been conducted in the NASA-Langley Transonic Dynamics Tunnel to investigate the ground resonance phenomenon of a soft in-plane hingeless rotor. Experimental data were obtained using a 9 ft. (2.74 m) diameter model rotor in hover and forward flight. Eight model rotor configurations were investigated. Configuration parameters included pitch-flap coupling, blade sweep and droop, and precone of the blade feathering axis. An analysis based on a comprehensive analytical model of rotorcraft aerodynamics and dynamics was used for this study. The moving-block method was used to experimentally determine the regressing lead-lag mode damping. Good agreement has been obtained between the analysis and test. Both analysis and experiment indicated ground resonance instability in hover. The paper presents an outline of the analysis, a description of the experimental model and procedures, and comparison of the analytical and experimental data. (Author).

Notes:

Title from title screen (viewed Nov. 3, 2015).

"August 1983."

"Performing organization: Structures Laboratory, AVRADCOM Research and Technology Laboratories, NASA Langley Research Center"--Technical report page.

Includes bibliographical references (pages 9-10).

Other Format:

Print version: Yeager, William T. Aeromechanical stability of a hingeless rotor in hover and forward flight

Microfiche version: Yeager, William T. Aeromechanical stability of a hingeless rotor in hover and forward flight

OCLC:

761470267