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 “"Stability Metrics"”.
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Nonlinear Control System Stability Metrics via A Singular Perturbation Approach
… Generalized Gain Margin (GGM) are proposed as stability metrics for Linear Time-Invariant (LTI) systems, Linear Time-Varying (LTV) systems, Nonlinear Time-Invariant (NLTI) systems and Nonlinear Time-Varying (NLTV) systems, which are: (i) theoretically based, (ii) practically measurable, (iii) …
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Resilience in marine ecosystems: the effects of environmental and ecological context on ecosystem multistability
… ultimately how this affects overall ecosystem stability. The aims of this thesis are to enhance such studies by investigating: 1) The mechanisms that determine multiple forms of ecological stability by manipulating key components of a food web that are thought theoretically to drive stability, …
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TOPOLOGY-GUIDED MARKET-BASED MULTI-ROBOT TASK ALLOCATION
… to improve coordination efficiency and task stability across multi-robot systems. Building on this representation, we formulate a market-based allocation protocol that leverages local bidding and con- sensus, augmented with topological stability metrics to balance travel distance, risk, and …
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Application of a design optimization strategy to multi-stage compressor matching
… combines a mean-line flow solver and a dynamic stability analysis of a six-stage low-pressure compressor of a modern turbofan engine to optimize the blade row geometry for enhanced stability at flight idle conditions. To assess the potential improvements in compressor stability at low speed, a …
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Assessment of Powered Ankle Exoskeleton on Human Stability and Balance
… and unactuated states affect balance and stability when performing a balancing tasking on a beam. Data was collected via inertial measurement units and analyzed on a pooled level (with data from all subjects) and on an individual level. It was found that the exoskeleton in both states …
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Habitat variability and ecosystem processes in intertidal soft-sediments
… variables explained the different sediment stability metrics, suggesting disturbances that reduce the abundance of large macrofauna can have substantial impacts on ecosystem functioning. Finally, I used empirical data derived from multi-habitat field experiments to parameterise a spatial …
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Application of robust nonlinear model predictive control to simulating the control behaviour of a racing driver
… to assess the validity of state variances as stability metrics. Comparison to existing stability and controllability criteria indicates that this novel metric can provide meaningful insights into vehicle performance. The LQR however, fails to stabilise the vehicle as tyres saturate. The …
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Advanced Assessment of Inverter-based Resources-Storage Technologies on Modern Electric Grids in terms of Power Profiling, Ancillary Services, and Transient Stability
… service performance, and compromised transient stability. These complexities also hinder the applicability of conventional operational reliability indices. This dissertation addresses these challenges by developing advanced methodologies to enhance grid dispatchability, transient stability, …
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Evaluating Routing Protocol for Low power and Lossy Networks (RPL)-Based Load Balancing Routing Algorithms in Internet of Things (iot) Networks
… was evaluated based on reliability and stability metrics in different network sizes. The results obtained indicate that BLRPL is the most effective routing algorithm for IoT networks with the maximum of 96% of packet delivery ratio, 0.16 ms of network delay and 1.0 mW power consumption.
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Load Learning and Topology Optimization for Power Networks
… that help improve efficiency, reliability, and stability of modern power networks. To this end, the work in this thesis explores a generalized modeling and analysis framework for two pertinent tasks: i) learning loads via grid probing, and; ii) optimizing power grid topologies for stability. …
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On the Stability of Software Clones: A Genealogy-Based Empirical Study
… been conducting studies that measure source code stability (the likelihood that code will be modified) of cloned code compared to non-cloned code. If the presence of clones in program artifacts (files, classes, methods, variables) causes the artifacts to be more frequently changed (i.e., cloned …