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Showing 1 to 20 of 70 for “"Aeroelasticity"”.
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Robust scheduling control of aeroelasticity.
Aeroelasticity is a broad term describing the often complex interactions between structural mechanics and aerodynamics. Aeroelastic phenomena such as divergence and flutter are potentially destructive, and thus must be avoided. Passive methods to avoid undesirable aeroelastic phenomena often …
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Continuum Sensitivity Method for Nonlinear Dynamic Aeroelasticity
In this dissertation, a continuum sensitivity method is developed for efficient and accurate computation of design derivatives for nonlinear aeroelastic structures subject to transient<br />aerodynamic loads. The continuum sensitivity equations (CSE) are a set of linear partial<br />differential …
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Aeroelasticity of Morphing Wings Using Neural Networks
… In order to extend this methodology to dynamic aeroelasticity, it is also necessary to model the unsteady aerodynamic loads over an airfoil. Accordingly, an unsteady aerodynamic panel method is developed using a distributed set of doublet panels over the surface of the airfoil and along its …
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Advances in structural dynamics, aeroelasticity and material science
… his new approaches to structural dynamics, aeroelasticity, material science and related problems. In particular, the major activities of his research relate to the (i) free vibration and buckling analysis of structures, (ii) dynamic stiffness formulation, (iii) response of metallic and …
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Fast prediction of transonic aeroelasticity using computational fluid dynamics
The exploitation of computational fluid dynamics for non linear aeroelastic simulations is mainly based on time domain simulations of the Euler and Navier-Stokes equations coupled with structural models. Current industrial practice relies heavily on linear methods which can lead to conservative …
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Structural dynamics modeling of helicopter blades for computational aeroelasticity
… domain of helicopter blades for computational aeroelasticity. A structural model and an aeroelastic model are provided and a computer program has been developed and tested in this research. In the structural model, second-order backward Euler method is used to discretize the nonlinear intrinsic …
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Designing Active Control Laws in a Computational Aeroelasticity Environment
… designing active control laws in a computational aeroelasticity environment. The methodology involves employing a systems identification technique to develop an explicit state-space model for control law design from the output of a computational aeroelasticity code. The particular computational …
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The Effect of Blade Aeroelasticity and Turbine Parameters on Wind Turbine Noise
… to compute turbine noise accounting for blade aeroelasticity. Using the newly developed simulation tool, the effects flexible blades on wind turbine noise are investigated, as well as the effects of turbine parameters, e.g. wind conditions, rotor size, tilt, yaw, and pre-cone angles. The …
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Aeroelasticity of wings coupling Navier-Stokes aerodynamics with wing-box finite elements
Strong interactions between flow about an aircraft wing and the wing structure can result in aeroelastic phenomena which significantly impact aircraft performance. Time-accurate methods for solving the unsteady Navier-Stokes equations have matured to the point where reliable results can be obtained …
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Vibration and Aeroelasticity of Advanced Aircraft Wings Modeled as Thin-Walled Beams--Dynamics, Stability and Control
Based on a refined analytical anisotropic thin-walled beam model, aeroelastic instability, dynamic aeroelastic response, active/passive aeroelastic control of advanced aircraft wings modeled as thin-walled beams are systematically addressed. The refined thin-walled beam model is based on an …
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Flight Dynamics and Control of Highly Flexible Flying-Wings
… deformation in flight, and coupling between aeroelasticity and flight dynamics. As a result of this coupling, an integrated model of the aeroelasticity and flight dynamics has to be used to accurately model the dynamics of the flexible flying wing. Such an integrated model of the flight …
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Dynamics and Control of Flexible Aircraft
… and rotations, corresponding to "extended aeroelasticity." Due to computational speed advantages, the aerodynamic forces are derived by means of strip theory. The control forces for the flight dynamics problem are obtained by an "inverse" process. On the other hand, the feedback control …
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Numerical solutions for a class of singular integrodifferential equations
… class has been motivated by an application in aeroelasticity. By applying nonconforming finite element methods, we are able to establish convergence for a semi-discrete scheme. We use an ordinary differential equation solver for the semi-discrete scheme and then improve the result by using a …
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Large Deflection Inextensible Beams and Plates and their Responses to Nonconservative Forces: Theory and Computations
<p>There is a growing interest among aeroelasticity researchers for insight into large deflection oscillations of aerospace structures. Here, a new beam and plate model is derived using Hamilton's Principle to lay the structural framework for a nonlinear, large deflection aeroelastic model. Two …
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Aero-servo-viscoelasticity theory: lifting surfaces, plates, velocity transients, flutter, and instability
… formed the first foray into the field of aeroelasticity. Aeroelasticity is the intersection and interaction between aerodynamics, elasticity, and inertia or dynamics. Aeroelasticity is well suited for metal aircraft, but requires expansion to improve its applicability to composite …
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Experimental and numerical study of hypersonic aeroelastic intakes
… the off-design intake operations due to aeroelasticity. An aeroelastic intake was tested in a hypersonic wind tunnel to assess its dynamic flowfield, structural response, and performance. The experiments were informed with static 2D, full-scale static 3D, and fully coupled 2D and 3D …
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A simple finite element for the dynamic analysis of rotating composite beams
… attempt is made to understand the phenomenon of aeroelasticity as applied to the helicopter rotors, specifically laminated composite rotor blades. Realizing the immense complexity of the problem, a beginning has been made by developing a structural model for a rotating composite beam. Present …
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Well-posedness questions and approximation schemes for a general class of functional differential equations
… NFDE-system that arises in the study of aeroelasticity is established on R<sup>n</sup>xL<sub>p</sub>, 1≤p<2. Employing the equivalence between generalized solutions of NFDEs and mild solutions of the “corresponding” abstract Cauchy-problems, we make use of general approximation results …
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Investigating Aerodynamic Coefficients and Stability Derivatives for Truss-Braced Wing Aircraft Using OpenVSP
… analysis of the aircraft with the focus on aeroelasticity. In this thesis, various aerodynamic coefficients and stability derivatives are investigated by applying Vortex-Lattice Method using OpenVSP, an open-source platform. The variation in aerodynamic parameters with changes in …
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Aeroelastic Analysis of Membrane Wings
… 2-D VLM and a doublet lattice method. The aeroelasticity is studied by varying parameters affecting the flow as well as parameters affecting the structure. The parametric studies are performed for cases of constant angle of attack, plunge and, pitch and plunge. The response of the …
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