Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Flutter Instability"”.
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Fluid-structure interaction in noisy nonlinear systems
… (here the mean wind velocity) that exhibits flutter in the structure. The homogenization procedure yields a two dimensional Markov process characterized by its generator. Further simplification yields a one dimensional stochastic differential equation that characterizes the critical modes of …
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Analysis of flutter and flutter suppression via an energy method
… speeds. Preliminary designs often exhibit a flutter instability within the desired operating envelope of the aircraft. Passive methods which have been used to solve the flutter problem include added structural stiffness, mass balancing, and speed restrictions. These methods may result in …
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The application of parallel computer technology to the dynamic analysis of suspension bridges
… long span suspension bridge structures, such as flutter which is a catastrophic aeroelastic phenomena. The thesis is set out in two distinct parts:- Part I, presents the theoretical background of the main forms of aerodynamic instabilities, presenting in detail the main solution techniques used …
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Perturbation methods for slightly damped gyroscopic systems
… of parameters, it exhibits both divergence and flutter instability, simultaneously. Other numerical examples are given.
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Stability of Beams, Plates and Membranes due to Subsonic Aerodynamic Flows and Solar Radiation Pressure
… of the transition from flag-like to wing-like flutter for a cantilevered beam and experiments to quantify the post flutter fluid and structure response of the flapping flag. For the plate / membrane analysis, we show that the boundary conditions in the flow direction determine the type of …
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A Theory for Wheezing in Lungs
… oscillations of flexible tubes based on a flutter instability. This has been validated with our experimental work, and provides a predictive tool that can be used to understand wheezing in the airways of the lung. Our theory for the onset of wheezing relates the frequency of oscillation to …
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Semi-Analytical Model to Study Vibrations of High-Speed, Rotating Axisymmetric Bodies Coupled to Other Rotating/ Stationary Structures
… mode, changes to critical speeds, divergence and flutter instability phenomena, and eigenvalue veering are investigated for spinning systems with asymmetric features. The developed semi-analytical model is used for rotationally periodic systems, for example, planetary gears. Rotationally periodic …
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Analysis, Design, and Experimentation of Beam-Like Structures
… We also present the prediction of the onset of flutter instability for metal plate and inflatable wing shaped foam test articles analyzed using finite element analysis (FEA). FEA updating based on modal testing and by conducting a geometrically nonlinear analysis resulted in a good agreement …
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Instabilities in membrane structures under extreme conditions
… each one leading to a specific mechanical instability of the membranes: wrinkling under quasi-static conditions and flutter instability due to dynamic conditions of wind flow. In the first part of the thesis, the wrinkling analysis is addressed by removing the hypothesis of prevented …
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Piezoelectric Control of Structures Prone to Instabilities
… Under aerodynamic loading, they can experience flutter instability with the amplitudes of oscillations attaining a limit: LCO) or escalating without any limit. Control of structures prone to these forms of instability using piezo-electric actuators is the theme of this dissertation. Issues …
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Performance based wind design and optimization of tall buildings considering the nonlinearity in building response
… by self-excited forces which can result in flutter instability and amplification of response due to modification of structural damping and stiffness along all degrees of freedom. The performance objective focused in the study is occupant comfort and the structural parameters used in the …
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Fluid-structure interaction in compressible flows
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Dynamic Instabilities in Structures with Nonholonomic Constraints
… interesting dynamic behavior and capability of flutter via a Hopf bifurcation. The main contribution of the thesis is the development of models based on a double pendulum equipped with a non-holonomic constraint, which is a variant of Ziegler's double pendulum. The first investigation that has …