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An analytical technique for predicting the characteristics of a flexible wing equipped with an active flutter-suppression system and comparison with wind-tunnel data
TLDR
In this paper, an analytical technique for predicting the performance of an active flutter-suppression system is presented based on the use of an interpolating function to approximate the unsteady aerodynamics.Abstract:
An analytical technique for predicting the performance of an active flutter-suppression system is presented. This technique is based on the use of an interpolating function to approximate the unsteady aerodynamics. The resulting equations are formulated in terms of linear, ordinary differential equations with constant coefficients. This technique is then applied to an aeroelastic model wing equipped with an active flutter-suppression system. Comparisons between wind-tunnel data and analysis are presented for the wing both with and without active flutter suppression. Results indicate that the wing flutter characteristics without flutter suppression can be predicted very well but that a more adequate model of wind-tunnel turbulence is required when the active flutter-suppression system is used.read more
Citations
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Journal ArticleDOI
Design for Active Flutter Suppression and Gust Alleviation Using State-Space Aeroelastic Modeling
TL;DR: In this paper, an analytical design technique for an active fluttersuppression and gust-alleviation control system is presented based on a rational approximation of the unsteady aerodynamic loads in the entire Laplace domain, which yields matrix equations of motion with constant coefficients.
Journal ArticleDOI
Aircraft Active Flutter Suppression: State of the Art and Technology Maturation Needs
TL;DR: Active flutter suppression, which is a part of the group of flight vehicle technologies known as active controls, is an important contributor to the effective solution of aeroelastic instability.
Journal ArticleDOI
Consistent Rational-Function Approximation for Unsteady Aerodynamics
Walter Eversman,Ashish Tewari +1 more
Journal ArticleDOI
Control Law Synthesis for Flutter Suppression Using Linear Quadratic Gaussian Theory
TL;DR: In this paper, the authors describe the application of linear quadratic Gaussian (LQG) methodology to the design of active control systems for suppression of aerodynamic flutter.
An analytical technique for approximating unsteady aerodynamics in the time domain
TL;DR: In this article, an analytical technique for approximating unsteady aerodynamic forces in the time domain was presented for an aeroelastic, cantilevered, semispan wing which indicate a good fit to the aerodynamic force for oscillatory motion can be achieved with a matrix Pade approximation having fourth order numerator and second order denominator polynomials.
References
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Book
Unsteady aerodynamic modeling and active aeroelastic control
TL;DR: In this article, the transfer functions relating the arbitrary airfoil motions to the airloads are derived from the Laplace transforms of the linearized airload expressions for incompressible two dimensional flow.
Proceedings ArticleDOI
On the use of Pade approximants to represent unsteady aerodynamic loads for arbitrarily small motions of wings
TL;DR: In this article, the general behavior of unsteady airloads in the frequency domain is explained, and a systematic procedure is described whereby the airloads, produced by completely arbitrary, small, time-dependent motions of a thin lifting surface in an airstream, can be predicted.
Development and application of an optimization procedure for flutter suppression using the aerodynamic energy concept
E. Nissim,I. Abel +1 more
TL;DR: In this paper, an optimization procedure is developed based on the responses of a system to continuous gust inputs, which yields a flutter suppression system which minimizes control surface activity in a gust environment.
Development of Active Flutter Suppression Wind Tunnel Testing Technology
TL;DR: In this paper, a one-thirtieth scale B-52 aeroelastic model was modified to represent the Control Configured Vehicles (CCV) B -52 flight test airplane with an active flutter mode control system (FMCS).