NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Hover Testing of the NASA/Army/MIT Active Twist Rotor Prototype BladeHelicopter rotor individual blade control promises to provide a mechanism for increased rotor performance and reduced rotorcraft vibrations and noise. Active material methods, such as piezoelectrically actuated trailing-edge flaps and strain-induced rotor blade twisting, provide a means of accomplishing individual blade control without the need for hydraulic power in the rotating system. Recent studies have indicated that controlled strain induced blade twisting can be attained using piezoelectric active fiber composite technology. In order to validate these findings experimentally, a cooperative effort between NASA Langley Research Center, the Army Research Laboratory, and the MIT Active Materials and Structures Laboratory has been developed. As a result of this collaboration an aeroelastically-scaled active-twist model rotor blade has been designed and fabricated for testing in the heavy gas environment of the Langley Transonic Dynamics Tunnel (TDT). The results of hover tests of the active-twist prototype blade are presented in this paper. Comparisons with applicable analytical predictions of active-twist frequency response in hovering flight are also presented.
Document ID
20040086736
Document Type
Conference Paper
Authors
Wilbur, Matthew L. (Army Research Lab. Hampton, VA, United States)
Yeager, William T., Jr. (Army Research Lab. Hampton, VA, United States)
Wilkie, W. Keats (Army Research Lab. Hampton, VA, United States)
Cesnik, Carlos E. S. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Shin, Sangloon (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2000
Subject Category
Aircraft Design, Testing and Performance
Meeting Information
American Helicopter Society 56th Annual Forum(Virginia Beach, VA)
Distribution Limits
Public
Copyright
Public Use Permitted.
Document Inquiry