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 17 of 17 for “"Modal Interactions"”.
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Modal interactions in shell dynamics
… numerical-perturbation approach is used to study modal interactions in the dynamic response of infinitely long circular cylindrical shells to an external harmonic excitation. The excitation frequency is near the linear natural frequency of the breathing mode (i.e., primary resonance of the …
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Modal interactions in the dynamic response of isotropic and composite plates
… yields inaccurate results. The influence of modal interactions on the response of harmonically excited plates is investigated in detail. The case of a two-to-one autoparametric resonance in shear-deformable composite laminated plates is considered. Four first-order ordinary-differential …
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A theoretical and experimental study of modal interactions in resonantly forced structures
The influence of modal interactions on the response of harmonically excited flexible L-shaped metallic and composite structures has been investigated analytically and experimentally. Each metallic structure possesses a two-to-one internal resonance, while each composite structure possesses a …
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A theoretical and experimental study of modal interactions in metallic and laminated composite plates
This dissertation focuses on nonlinear modal interactions in plates. Our first investigation involved the activation of a two-to-one internal resonance in the response of a metallic cantilever plate. Although the plate was excited around the frequency of its second bending mode, its response …
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Data-driven system identification of strongly nonlinear modal interactions and model updating of nonlinear dynamical systems
… wavelet and Hilbert transforms, and experimental modal analysis. The first portion of this dissertation concerns the development of an advanced signal decomposition procedure, termed wavelet-bounded empirical mode decomposition, and considers applications to the detection of strongly nonlinear …
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Modal interactions and targeted energy transfers in laminar vortex-induced vibrations of a rigid cylinder with strongly nonlinear internal attachments
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Seth Robbins (robbins.sd@gmail.com) on 2014-01-16T18:19:53Z Item is restricted until 2016-01-16T18:19:34Z
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Developing effective virtual simulations and serious games: the effect of background sound cues on visual quality perception
… issues regarding simulation quality, multi-modal cue interaction, and the resulting effect on visual quality perception and ultimately on knowledge transfer and retention. Here the results of a series of seven studies that examined the effect of background sound (contextually related and …
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Multimodal Learning for Disease Diagnosis and Progression Modeling
… care. Traditional approaches rely on a single modality, such as clinical assessments, neuroimaging, or genetic markers, but may fail in capturing the complex, multifaceted nature of AD. Therefore, multimodal learning addresses this limitation by integrating complementary information across …
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Understanding Language Gain in the Overseas Immersion Context: Multi-Modal Assessment of Young Adult Learners of Arabic, Chinese, and Russian
… within specific language programs; and cross-modal interactions for participants of the Russian programs are addressed.</p>
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From predictive to interactive multimodal language learning
… models of human learning from naturalistic multi-modal input. We will start by introducing a model that assumes a purely predictive learner existing in a non-communicative setup and show that such a computational learner when tested displays comparable learning behaviour to human learners on a …
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An investigation of flow-induced vibrations of a steam-generator tube
… we conclude that chaos is the result of modal interactions. Observing the details of impacts. we also conclude that chaos appears when a second impact occurs on the same stopper. We also found intermittent chaos alternating with transient periodic motions. Lastly, we estimate the mean …
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Nonlinear effects on interfacial wave growth into slug flow
… unstable to short waves and does not allow for modal interactions. When nonlinearity is included, additional second order sum- and difference-wavenumber modes as well as higher harmonics must be accounted for. Given an initial spectrum of stable modes, sum-wavenumber modes and higher harmonics …
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Nonlinear Vibrations of Metallic and Composite Structures
… motions. Also, physical interpretations of the modal interactions are made. In the third study, a theoretical investigation into a previously unreported modal interaction between high-frequency and low-frequency modes that is observed in some experiments is conducted. This modal interaction …
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The Modelling and Simulation of the Dynamic Behaviour of a Lift Car-Rope Suspension System
… that nonlinear coupling may lead to extensive modal interactions in the system. Experimental tests were carried out in order to validate the model and the techniques which were used. Thus a valid model was developed to analyse the dynamic behaviour of a lift car-rope suspension system and …
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Nonlinear Response of Cantilever Beams
… are investigated using perturbation techniques. Modal interactions between the bending-bending and bending-bending-twisting motions are studied. Using a variational formulation, we obtained the governing equations of motion and associated boundary conditions for monoclinic composite and isotropic …
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Nonlinear Vibrations of Cantilever Beams and Plates
A study of the nonlinear vibrations of metallic cantilever beams and plates subjected to transverse harmonic excitations is presented. Both experimental and theoretical results are presented. The primary focus is however on the transfer of energy between widely spaced modes via modulation. This …
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Nonlinear dynamics of composite plates and other physical systems
… numerical-perturbation approach is used to study modal interactions in the response of the surface of a liquid in a cylindrical container to a principal parametric resonant excitation in the presence of a two-to-one internal (autoparametric) resonance. The force-response curves exhibit saturation, …