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Effect of control surface mass unbalance on the stability of a closed-loop active control systemThe effects on stability of inertial forces arising from closed-loop activation of mass-unbalanced control surfaces are studied analytically using inertial energy approach, similar to the aerodynamic energy approach used for flutter suppression. The limitations of a single control surface like a leading-edge (LE) control or a trailing-edge (TE) control are demonstrated and compared to the superior combined LE-TE mass unbalanced system. It is shown that a spanwise section for sensor location can be determined which ensures minimum sensitivity to the mode shapes of the aircraft. It is shown that an LE control exhibits compatibility between inertial stabilization and aerodynamic stabilization, and that a TE control lacks such compatibility. The results of the present work should prove valuable, both for the purpose of flutter suppression using mass unbalanced control surfaces, or for the stabilization of structural modes of large space structures by means of inertial forces.
Document ID
Document Type
Technical Publication (TP)
Nissim, E.
(Technion - Israel Inst. of Tech. Haifa., United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1989
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.60:2952
Accession Number
Funding Number(s)
PROJECT: RTOP 505-66-71
Distribution Limits
Work of the US Gov. Public Use Permitted.
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