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 11 of 11 for “"nonlinear oscillator"”.
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NONLINEAR DYNAMICS OF CABLE GALLOPING VIA A TWO-DEGREE-OF-FREEDOM NONLINEAR OSCILLATOR
… been investigated via a two-degree-of-freedom oscillator. The analytical solutions of periodic motions for this two-degree-of-freedom system are represented by the finite Fourier series. The analytical bifurcation trees of periodic motions to chaos of a transmission line under both steady and …
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Robust design optimization with dynamic constraints using numerical continuation
… solutions of a linear, harmonically forced oscillator. The robust design optimization method is then applied a harmonically forced nonlinear oscillator.
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Asymptotic analysis of the parametrically driven damped nonlinear evolution equation
… for the parametrically driven damped linear and nonlinear oscillator, the linear and nonlinear Klein-Gordon equations in the small-amplitude limit in various frequency regimes. In the case of the parametrically driven linear oscillator, we apply the Lindstedt-Poincare method and the …
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Low-frequency, low-amplitude MEMS vibration energy harvesting
… nature of ambient vibrations. Bi-stable nonlinear oscillator based energy harvesters are developed for lowering the operating frequency while widening the bandwidth, and are realized at MEMS scale for the first time. This design concept does not rely on the resonance of the MEMS structure …
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Study of reduced order models for vortex-induced vibration and comparison with CFD results
… the effects of the surrounding fluid on the oscillator; the latter is generally a nonlinear oscillator exhibiting limit cycle behavior. The coupling, structural equation, and type of nonlinearity in the wake equation vary between different models, and the effects of these differences will be …
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Nonlinear beam-based vibration energy harvesters and load cells
This thesis studies a novel nonlinear spring mechanism that is comprised of a cantilever wrapping around a curved surface as it deflects. Static force versus displacement tests and dynamic "initial displacement" tests verified the spring theory for a large range of oscillator parameters. Various …
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Microstrip Superconducting Quantum Interference Devices for Quantum Information Science
… amplification to probe the dynamics of a SQUID oscillator. The SQUID oscillator is a flux-tunable microwave resonator formed by a capacitively shunted dc SQUID. Josephson plasma oscillations are induced by pulsed microwave excitations at the resonant frequency of the oscillator. Once pulsed, …
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A study of Population MCMC for estimating Bayes Factors over nonlinear ODE models
… may be most accurately represented using nonlinear models based on systems of ordinary differential equations (ODEs), however parameter inference over these models often produces correspondingly nonlinear posterior distributions, which are very challenging to sample from, often resulting …
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Neuromuscular control adaptation during recovery from injury
… specific aims are to explore the origins of such nonlinear phenomena in the context of broken symmetry in simple dynamical-systems models, as well as to examine the clinical progression of adaptive changes in neuromuscular control throughout incremental recovery from a simulated ankle injury. …
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Random perturbations of delay differential equations at the verge of instability and periodically driven nonlinear oscillators
… a linear DDE perturbed by small noise and small nonlinearities. The instability scenario considered is the following: a pair of roots of the characteristic equation (critical eigenvalues) lie on the imaginary axis of the complex plane, and all other roots have negative real parts (stable …
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Predicting and identifying signs of criticality near neuronal phase transition
… due to Keener and Sneyd, and an op-amp based nonlinear oscillator circuit. Although all three models can produce nonlinear ``spiking" oscillations, our focus is on the altering characteristics of noise-induced fluctuations near spiking onset and death via Hopf bifurcation. We introduce …