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 18 of 18 for “"Nonlinear Resonance"”.
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Nonlinear resonance and excitability in interconnected systems
… two basic interconnections in the contexts of nonlinear resonance and excitability, two phenomena with the potential of encompassing a large number of applications. The first interconnection is considered in the context of vibration absorption. It corresponds to coupling two Duffing …
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Nonlinear resonance of trapped waves on a plane beach
… (1976) gave a theoretical explanation of the nonlinear mechanism of sub-harmonic resonance. This type of theory has been extended by Minzoni & Whitham (1977), Rockliff (1978), and Rockliff & Smith (1985), among others. Rockliff also initiated a. theory whereby subharmonic resonance can be …
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Linear and nonlinear resonance of water waves near periodic structures
In the first part of this thesis, we present a nonlinear theory for the excitation of trapped wave around a circular cylinder mounted at the center of a channel. It is well-known that near an infinite linear array of periodically spaced cylinders trapped waves of certain eigen-frequencies can …
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Machine learning in ocean applications : wave prediction for advanced controls of renewable energy and modeling nonlinear viscous hydrodynamics
… of ocean waves, viscous effects of the flow, nonlinear resonance, etc., and the combination of these factors. Data-driven techniques is an prospective approach complementary to traditional methods to model physical problems since data from experiments, field tests or high-fidelity simulations …
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Dynamical Tunneling in Systems with a Mixed Phase Space
… billiards, and optical microcavities, if nonlinear resonances are negligible. Semiclassically, however, such nonlinear resonance chains dominate the tunneling process. Hence, we combine our approach with an improved resonance-assisted tunneling theory and derive a unified prediction which …
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Understanding of weak turbulence of capillary waves
… property of an ensemble of waves in weakly nonlinear interactions. In the wavenumber k domain, the WTT steady-state analytical solution yields a power-law inertial-range spectrum I - ka, with a constant energy flux P from large forcing scales to small dissipative scales. Over the years, this …
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Intentional nonlinearity in the design of dynamic micro/nanomechanical resonators via nanomaterial-integrated fabrication
… damping, these devices often exhibit significant nonlinearity, which results in limiting the operational range when they are intended to operate in a linear regime. However, nonlinear resonance, easily realized in a micro/nanomechanical system, also opens up a whole new window for the study of …
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Constructive utilization of intentional nonlinearity in systems of coupled micro/nanomechanical resonators
… of these systems, i.e., high frequency resonance and high Q-factor, arising from their small length scales. Most of previous studies in micro/nanomechanical resonators, however, remain in the framework of the linear dynamics while the inherent nonlinearity of these systems is either …
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Interactive Spin Dynamics in Magnon and Quantum Spin Systems
… frequency window of NV-based magnetometers using nonlinear microwave-spin interactions, offering novel functionalities in quantum state control and sensing. We further exploit nonlinear spin dynamics by hybridizing NV centers with magnonic thin films, which not only amplifies the intensity of …
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Instabilities of an eastern boundary current with and without large-scale flow influence
… modes of an eastern boundary current can become nonlinearly unstable by resonating with short trapped unstable modes. This phenomenon is clearly demonstrated in the weakly nonlinear simulations. Results suggest that linearly stable longwave modes deserve more attention when the radiating …
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Unified interpretation of nonlinear elasticity in granular solids, A
… solids such as natural rocks and concrete show nonlinear elasticity in response to dynamic deformation with a large strain amplitude. Resonance experiments can measure the nonlinear elasticity using resonance curves which show response amplitudes as a function of driving (oscillation) …
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Instabilities of an eastern boundary current with and without Large-scale Flow Influence
… modes of an eastern boundary current can become nonlinearly unstable by resonating with short trapped unstable modes. This phenomenon is clearly demonstrated in the weakly nonlinear simulations. Results suggest that linearly stable longwave modes deserve more attention when the radiating …
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Investigation of the Mechanical Behavior of Microbeam-Based MEMS Devices
… microswitches and resonant microsensors. Nonlinear models are developed to simulate the behavior of the microbeams in each device. The models account for mid-plane stretching, an applied axial load, a DC electrostatic force, and, for the case of resonant sensors, an AC harmonic force. …
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A THEORETICAL INVESTIGATION OF PROSPECTS FOR MODE SELECTIVE OVERTONE PHOTOCHEMISTRY (QUANTUM DYNAMICS)
… of motion are propagated and analyzed using nonlinear resonance theory. We find energy flows along resonance enhanced pathways leading to nonstatistical chemical reactivity. There exist, however, profound perturbations for both models due to nonresonant energy flow. It is concluded that this …
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The Modelling and Simulation of the Dynamic Behaviour of a Lift Car-Rope Suspension System
… dynamic behaviour of the lift system due to its nonlinear and nonstationary nature.<br/><br/>The aim of this research is to describe, analyse and appraise the dynamic behaviour of a lift car-rope suspension system under various operational conditions. The objectives of this thesis are to …
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Identification of Transient Nonlinear Aeroelastic Phenomena
Complex nonlinear aspects of aeroelastic phenomena include unsteady nonlinear aerodynamic loads, structural nonlinearities, as well as nonlinear couplings between the flow and the structural response. Nonlinearities in aerodynamic loads originate from unsteady shocks and/or flow separation. …
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Modelling and Prediction of the Effects of Dynamic Responses of Tall Buildings on an Elevator System
… behaviour of the elevator system due to its nonlinear and nonstationary nature. <br/><br/>Due to the time varying length of the ropes in the elevator system the mass and the stiffness of the system change and consequently its dynamic characteristics such as frequencies, damping ratios and …
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Strongly nonlinear acoustics of one-dimensional granular sonic vacua
This research is concerned with the nonlinear dynamics and acoustics of one dimensional ordered granular media. In particular the considered granular systems are composed of discrete elastic spherical beads that mutually interact through strongly nonlinear Hertzian force interaction law. In this …