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 15 of 15 for “"model simplification"”.
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Model simplification of chemical kinetic systems under uncertainty
… the impact of uncertainty on the reduction and simplification of chemical kinetics mechanisms. Chemical kinetics simulations of complex fuels are very computationally expensive, especially when combined with transport, and so reduction or simplification must be used to make them more tractable. …
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Reduced-Cost CEM Problems Through Model Simplification and a-Priori Information
This work focuses primarily on scattering by large conducing bodies. We also consider radiation and scattering by dielectric-coated, metallic surfaces. For these problems, solution efficiency is improved by using boundary conditions to reduce a volumetric formulation to a surface formulation. …
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Model simplification and robust control in deterministic and stochastic systems using singular perturbation methods
… structural changes, unknown parameters, and unmodeled fast dynamics. A number of different stochastic and deterministic models that incorporate these uncertainties have been proposed in the literature, and these have led to different robust control and filtering problem formulations, …
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Comprehensive optimization and practical design of power electronic systems under multiple competing performance demands
… and to incorporate power circuit and controller model into one comprehensive model. Component parameters are considered discrete and defined by a database. Special challenges to implement the proposed optimization scheme, such as a large and discrete variable space and a model that contains …
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A Closed-Form Dynamic Model of the Compliant Constant-Force Mechanism Using the Pseudo-Rigid-Body Model
A mathematical dynamic model is derived for the compliant constant-force mechanism, based on the pseudo-rigid-body model simplification of the device. The compliant constant-force mechanism is a slider mechanism incorporating large-deflection beams, which outputs near-constant-force across the …
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Development of Micro Thermal Actuator with Capactive Sensor
… thesis describes a finite element analysis (FEA) model of an indirect heating thermal actuator. The heat transfer mechanisms are investigated and the conductive heat transfer is found to be the dominant heat transfer mode. A model simplification method is discussed and used in the analysis to …
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Residential building energy analysis : development and uncertainty assessment of a simplified model
… usage, a simplified building energy analysis model was developed. Using this model, a new computer program was written in C/C++ to calculate annual heat and cooling loads for residential buildings and to provide information about the relative importance of load contributions from the different …
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Algorithms for Reconstructing and Reasoning about Chemical Reaction Networks
… and signaling pathways. These mechanisms are modeled by chemical reaction networks (CRNs) which are typically simulated by converting to ordinary differential equations (ODEs), so that the goal is to closely reproduce the observed quantitative and qualitative behaviors of the modeled process. …
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Effective design of multiplexing network for applications in communications satellites
… design. Channel filter tuning, circuit model simplification, and neural network training processes are detailed in the thesis. Space-Mapping optimization technology has been applied in the tuning of a channel filter. The artificial neural network is applied as the method to compensate …
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Constrained Control of Complex Helicopter Models
Complex helicopter models that include effects typically ignored in control models, such as an analytical formulation for fuselage aerodynamics, blade lead-lagging and flexibility, and tail rotor aerodynamics, are derived. The landing gear, horizontal tailplane, a fully articulated main rotor, main …
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Practical Optimisation of District Energy Systems: Representation of Technology Characteristics, Demand Uncertainty, and System Robustness
… three methodological enhancements which address model simplification, parameter uncertainty, and conflicting decision-maker objectives. These enhancements enable the practical design of district energy systems through data-centric workflows which can readily represent real system complexities in …
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Non-invasive Measurement of Cholesterol in Human Blood by Impedance Technique: an Investigation by Finite Element Field Modelling
… methodologies for numerical finite element (FE) modelling of simplified blood-cholesterol system, representing a real measurement system. This has been done first in 2D, to prove the concept and then in 3D, to take into account all of the effects that would only be present in 3D system as well as …
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Composite load modeling for power systems: Model reduction, identification, and application to conservation voltage reduction
Load modeling is essential to power system stability analysis, optimization, and controller design as shown in many research. Although the importance of load modeling is recognized by power system researchers and engineers, obtaining an accurate load model remains challenging due to the large …
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Tecniche per il controllo dinamico del consumo di potenza per piattaforme system-on-chip
… therefore most authors propose simplified models and heuristic approaches to solve it in reasonable time. Model simplification is often achieved by abstracting away platform implementation ”details”. As a result, optimization problems become more tractable, even reaching polynomial time …