Design and test of three active flutter suppression controllers

Christhilf, Davidm and Waszak, Martinr and Adams, Williamm and Srinathkumar, S and Mukhopadhyay, Vivek (1991) Design and test of three active flutter suppression controllers. In: 4th NASA Workshop on Computational Control of Flexible Aerospace Systems, 14-18 1991, United States.

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Abstract

Three flutter suppression control law design techniques are presented. Each uses multiple control surfaces and/or sensors. The first uses linear combinations of several accelerometer signals together with dynamic compensation to synthesize the modal rate of the critical mode for feedback to distributed control surfaces. The second uses traditional tools (pole/zero loci and Nyquist diagrams) to develop a good understanding of the flutter mechanism and produce a controller with minimal complexity and good robustness to plant uncertainty. The third starts with a minimum energy Linear Quadratic Gaussian controller, applies controller order reduction, and then modifies weight and noise covariance matrices to improve multi-variable robustness. The resulting designs were implemented digitally and tested subsonically on the Active Flexible Wing (AFW) wind tunnel model. Test results presented here include plant characteristics, maximum attained closed-loop dynamic pressure, and Root Mean Square control surface activity. A key result is that simultaneous symmetric and antisymmetric flutter suppression was achieved by the second control law, with a 24 percent increase in attainable dynamic pressure. (Author)

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Active control;Control surfaces;Control systems design;Control theory;Covariance;Flexible wings;Flutter;Wind tunnel tests;Wings;Accelerometers;Dynamic pressure;Loci;Matrices;Mean square values
Subjects: AERONAUTICS > Aeronautics (General)
Division/Department: Other, Other, Other, Flight Mechanics and Control Division, Other
Depositing User: M/S ICAST NAL
Date Deposited: 11 Oct 2006
Last Modified: 24 May 2010 09:51
URI: http://nal-ir.nal.res.in/id/eprint/2910

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