Journal ArticleDOI
New approach to finite-state modeling of unsteady aerodynamics
TLDR
In this article, the rotary wing indicial response function is shown to have a fundamentally different characteristic when compared to the fixed wing indicator response function, which is oscillatory in nature and nonoscillatory.Abstract:
This paper presents a novel technique for formulating a high quality finite state unsteady aerodynamic model by applying Bode plot methods, used in control engineering. Indicial response functions for both fixed wing and rotary wing applications are obtained using these finite state unsteady aerodynamic models. It is shown that the rotary wing indicial response function has a fundamentally different characteristic when compared to fixed wing indicial response. The rotary wing indicial response function is oscillatory in nature while the fixed wing indicial response function is nonoscillatory. Furthermore it should be emphasized that this is the first that a rotary-wing indicial response function has been presented in the literature.read more
Citations
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Journal ArticleDOI
State-space representation of unsteady airfoil behavior
J. G. Leishman,K. Q. Nguyen +1 more
TL;DR: In this paper, a method is presented to model the unsteady lift, pitching moment, and drag acting on a two-dimensional airfoil operating under attached-flow conditions in a compressible flow.
Journal ArticleDOI
On aerodynamic modelling of an insect–like flapping wing in hover for micro air vehicles
TL;DR: A new conceptual framework is proposed and, within this framework, two analytic approaches to aerodynamic modelling of an insect–like flapping wing in hover in the context of MAVs are proposed.
Journal ArticleDOI
Reduced order unsteady aerodynamic modeling for stability and control analysis using computational fluid dynamics
TL;DR: In this article, the authors present a review of reduced-order aerodynamic models for aircraft stability and control analysis, including linear and nonlinear indicial response methods, Volterra theory, radial basis functions, and a surrogate-based recurrence framework.
Journal ArticleDOI
Empirical state-space representations for Theodorsen's lift model
TL;DR: In this article, the authors cast Theodorsen's unsteady aerodynamic model into a general form that allows for the introduction of empirically determined quasi-steady and added-mass coefficients as well as an empirical Theodororsen function.
References
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Book
Modern control engineering
TL;DR: This comprehensive treatment of the analysis and design of continuous-time control systems provides a gradual development of control theory and shows how to solve all computational problems with MATLAB.
General Theory of Aerodynamic Instability and the Mechanism of Flutter
TL;DR: In this paper, the Kutta condition was used to analyze the aerodynamic forces on an oscillating airfoil or an air-foil-aileron combination of three independent degrees of freedom.
The unsteady lift of a wing of finite aspect ratio
TL;DR: In this paper, the aerodynamic inertia and the angle of attack of the infinite wing of a fixed aspect ratio plane were corrected by correcting the aerodynamics inertia and angle of attacks of the plane.