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 12 of 12 for “"multi-timescale"”.
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Multi-timescale mechanics of an active low-angle normal fault
… or geodetic records. In this dissertation, multi-disciplinary studies of the world’s most rapidly slipping low-angle normal fault are integrated to better understand the structural and tectonic evolution of detachment faults as well as to determine whether these faults slip in large …
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A Multi-Region Multi-Timescale Burning Plasma Dynamics Model for Tokamaks
… to the edge and ion orbit loss. The various timescales of radiation and transport processes in different regions are vital to the determination of tokamak operation. A multi-region multi-timescale transport model is developed to simulate burning plasma dynamics in tokamaks. Regions including …
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High-Dimensional Optimal Path Planning and Multi-Timescale Lagrangian Data Assimilation in Stochastic Dynamical Ocean Environments
… environment. The ocean is a prime example of multiscale nonlinear multidisciplinary and strongly coupled dynamics where measurements of one variable can be used to infer other fields through their joint dynamic probability density functions. Integrating ocean dynamics with autonomy enables the …
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Dynamic Reconfiguration of Network Topology in Optical Networks
… problem for a WDM network is combined with the multi-path routing of traffic throughout the network. Changes to the logical topology are made using branch exchanges to minimize the disruption to the network traffic. A Multi-timescale Markov Decision Process (MMDP) model is used to capture the …
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Characterization of a Spiking Neuron Model via a Linear Approach
… focused on the parameter estimation problem of a multi-timescale adaptive threshold (MAT) neuronal model. Using the dynamics of a non-resetting leaky integrator equipped with an adaptive threshold, a constrained iterative linear least squares method is implemented to fit the model to the reference …
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Modular modeling and control of a hybrid unmanned aerial vehicle’s powertrain
… most notable challenge is the coordination of multi-domain and multi-timescale system dynamics. This thesis seeks to address the challenge of coordination between the slow battery state of charge dynamic and faster electro-mechanical dynamics for a hybrid unmanned aerial vehicle. The …
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Efficient Learning Control via Structural Policy Priors, Latent World Models and Hierarchical Abstraction
… for single-agent control while decoupling multi-timescale strategic from reactive reasoning in the context of multi-agent team coordination. We lastly build latent world models for multi-step reasoning and sample efficient interaction selection. Our work employs uncertainty over expected …
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Estimation and fault diagnosis for vehicle energy systems
… operate over a wide span of energy domains and timescales. To ensure their safe, reliable, and efficient performance, a holistic system perspective for estimation is needed. Accurate dynamic state estimation is critical for two main reasons: 1. Thermal management: This dissertation proposes a …
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Predictable Real-Time Wireless Networking For Sensing And Control
… as possible to the sink by a deadline in lossy multi-hop wireless sensor networks.</p> <p>Real-time routing is a basic element of closed-loop, real-time sensing and control, but it is challenging due to dynamic, uncertain link/path delays. The probabilistic nature of link/path delays makes the …
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Frequency Stability Constrained Grid Operation with High Penetration of Renewables
… to maintaining frequency stability across multiple timescales from microseconds to hours and days.</p> <p>First, comprehensive low order frequency response models of various dynamic devices are derived, leading to an enhanced aggregated system frequency response model. The nadir is then …
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Power electronics implementation of dynamic thermal storage as effective inertia in large energy systems
… encounter increasing processed power in multi-physics domains, such as electrical, mechanical, thermal, and chemical. Although many systems are becoming predominantly electrical dependent, an integrated multi-physics energy approach creates additional avenues to higher power density, …
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Methodologies for electromagnetic field modeling for computer aided analysis of multi-domain physical interactions
… of electromagnetic fields in the context of multi-domain physical interactions. Among the challenges for computer aided analysis of electromagnetic problems in interaction with other physical phenomena are the largely different temporal and spatial scales that may occur and the task of …