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 “"System uncertainty"”.
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Some issues in the sliding mode control of rigid robotic manipulators
… scheme, the parameters of the upper bound of system uncertainty are adaptively estimated. The controller estimates are then used as controller parameters to eliminate the effects of system uncertainty and guarantee asymptotic error convergence. • A decentralised adaptive sliding mode control …
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Adaptive and neuroadaptive control for nonnegative and compartmental dynamical systems
… networks have been extensively used for adaptive system identification as well as adaptive and neuroadaptive control of highly uncertain systems. The goal of adaptive and neuroadaptive control is to achieve system performance without excessive reliance on system models. To improve robustness and …
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Analysis of mixing and thrust diagnostics for shock tunnel hot nozzle testing
… and assessment of mixing and thrust measurement systems for use with a shock tunnel for these applications. Results from preliminary testing of focused-Schlieren, shearing interferometer, and Mie-scattering systems are presented. The Mie-scattering method was judged to be most applicable to …
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Axisymmetric equilibrium and stability analysis in Alcator C-Mod, including effects of current profile, measurement noise and power supply saturation
… vertical feedback control must be robust against system uncertainty and the occurrence of noise and disturbances. At the same time, adaptive routines should be in place to handle unexpected events. The problem of robust control of the vertical position can be formulated in terms of identifying …
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Integral Quadratic Constraints and Safety Certificates for Uncertainty Characterization and Control Safety-Aware Filtering of Proximity Operations Between Satellites
… the capture of unmodeled dynamics to reduce system uncertainty of proximity operations among the Servicer, client satellite (Client), and unsafe regions (e.g., obstacle). The same controller is implemented with a finite time horizon (i.e., model predictive controller) to filter out unsafe …
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Operation under Uncertainty in Electric Grid: A Multiparametric Programming Approach
Uncertainty is a major factor in power system operations. In recent years, with the emergence of the smart grid, uncertainty level has been further elevated in both the generation and demand side of power systems. Increasing uncertainty exposes the electric grid to potential safety issues and …
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Neural Model-Based Advanced Control of Chylla-Haase Reactor
… control method and to design advanced control system for the polymerization reactor (Chylla-Haase) to maintain the high accurate reactor temperature. The first stage of this research start with the development of mathematical model of the process. The sub-models for monomer concentration, …
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Characterization of Oslds For Use In Small Field Photon Beam Dosimetry
… be unity. The minimum field size the masked OSLD system can accommodate as an audit tool was determined to be 10 mm diameter field for circular cones or 1 x 1 cm<sup>2</sup> field sizes. The overall system uncertainty was 3.72% (95% C.I.) for irradiations performed using a 1 x 1 cm<sup>2</sup> …
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Statistical Analysis of Electric Energy Markets with Large-Scale Renewable Generation Using Point Estimate Methods
… have introduced serious challenges to power system operation emanating from the uncertainties introduced to the system variables (electricity prices, congestion levels etc.). In order to economically operate the system and efficiently run the energy market, a statistical analysis of the …
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Optimality and iterative learning control: duality and input prediction
… learning control (ILC) applied to linear systems. Two different aspects are addressed: the first is the duality relationship existing between iterative learning control and repetitive control which allows the synthesis of controllers developed in one domain to be applied in the other. …
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The optimal design of groundwater quality monitoring networks under conditions of uncertainty
… at a waste disposal facility is complicated by uncertainty in both the characterization of the subsurface and the nature of the contaminant source. In addition, monitoring network design requires the resolution of multiple conflicting objectives. A method is presented that both incorporates …
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Estudio de la validación, errores e incertidumbre en la elaboración de mapas de ruido.
… and deviations that contribute to the final uncertainty of the result. An error in the final result of the noise map causes an incorrect amount of exposed population, as well as the design and implementation of inadequate or wrong noise action plans. The uncertainty analysis in the creation …
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A decomposition-based approach to uncertainty quantification of multicomponent systems
… throughout the design process. In today's modern systems, quantifying uncertainty can become cumbersome and computationally intractable for one individual or group to manage. This is particularly true for systems comprised of a large number of components. In many cases, these components may be …
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Impact evaluation of cyber-physical uncertainty on power systems
This thesis evaluates the impact on power system performance of uncertainty arising from physical and cyber components of power systems. If the impact of the uncertainty arising from emerging technologies is not fully understood, it will likely lead to the deployment of unreliable and unsafe …
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Advanced Neural Network Based Control for Automotive Engines
… value of 14.7 , under varying disturbance and system uncertainty. All the developed methods have been assessed using an engine simulation model built based on a widely used engine model benchmark, mean value engine model (MVEM). Satisfactory control performance in terms of effective regulation …
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Development of a scenario-based approach for responding to change in fishery systems: a case study in the small-scale fisheries of South Africa's Southern Cape
… on by change in their marine social-ecological systems (SES). The resulting complexity and uncertainty hamper their ability to achieve sustainability while holding implications for decision-making at various scales: fishers need to respond proactively to change at smaller scales of operation …
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Model Predictive Energy Management for Building Microgrids with IoT-based Controllable Loads
… installed IoT-based Building Energy Management System (BEMS), and MPC-Mix Integer Linear Programming (MILP) without IoT-based BEMS. An economic analysis is also conducted to provide a road map for the implementation of installing advanced energy efficiency technologies across loads in building …