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Flutter suppression and gust alleviation using active controlsThe effects of active controls on the suppression of flutter and gust alleviation of two different types of subsonic aircraft (the Arava, twin turboprop STOL transport, and the Westwind twin-jet business transport) are investigated. The active controls are introduced in pairs which include, in any chosen wing strip, a leading-edge (LE) control and a trailing-edge (TE) control. Each control surface is allowed to be driven by a combined linear-rotational sensor system, located on the activated strip. The control law, which translates the sensor signals into control surface rotations, is based on the concept of aerodynamic energy. The results indicate the extreme effectiveness of the active systems in controlling flutter. A single system spanning 10% of the wing semispan made the Arava flutter-free, and a similar active system, for the Westwind aircraft, yielded a reduction of 75% in the maximum bending moment of the wing and a reduction of 90% in the acceleration of the cg of the aircraft. Results for simultaneous activation of several LE - TE systems are presented. Further work needed to bring the investigation to completion is also discussed.
Document ID
19740018311
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Nissim, E. (Technion - Israel Inst. of Tech. Haifa, Israel)
Date Acquired
September 3, 2013
Publication Date
January 1, 1974
Subject Category
Aerodynamics
Report/Patent Number
TAE-198
NASA-CR-138658
Accession Number
74N26424
Funding Number(s)
CONTRACT_GRANT: NGR-52-012-006
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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