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 20 of 64 for “"transient conditions"”.
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Mission-Integrated Synthesis/Design Optimization of Aerospace Subsystems under Transient Conditions
… development and integration of higher fidelity transient heat exchanger models for use in the tip-to-tail. Finally, the change in performance due to the integration of new heat exchanger models developed here is presented. Additionally, this thesis discusses the results obtained by performing …
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Probing Interfacial Potential under Transient Conditions via Second Harmonic Generation at Pt-water interface
… the working and the reference electrodes. Under transient conditions, the electrochemical potential may deviate from the applied potential due to the Ohmic resistance (the RC element in the circuit). However, characterizing this deviation has been challenging. In this thesis, an optical method …
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Dynamic Synthesis/Design and Operation/Control Optimization Approach applied to a Solid Oxide Fuel Cell based Auxiliary Power Unit under Transient Conditions
… full load as the basis for the synthesis/design. Transient operation as reflected by changes in power demand, shut-down, and start-up are left as secondary tasks to be solved by system and control engineers once the synthesis/design is fixed. However, transient regimes may happen quite often and …
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Development and benchmarking of advanced FM-based particle transport algorithms for steady-state and transient conditions, implementation in RAPID and its VRS web-application
… is a significant need for 3-D steady-state and transient neutron transport formulations and codes that yield accurate, high-fidelity solutions with reasonable computing resources and time. These tools are essential for modeling innovative nuclear systems, such as next-generation reactor designs. …
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Digital simulation of fault location algorithms for EHV transmission lines
… systems is carried out in the steady-state and transient conditions.
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Experimental and theoretical investigation of constant rate of strain consolidation
… pore pressure measurement errors, initial transient conditions, and strain rate dependent soil behavior. There is also no set standard for the method of analysis to be used for interpretation of the CRS data. This experimental and theoretical study evaluates parameters that affect CRS test …
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Aspects of the drainage process in soils
… and to observe heads and seepage rates during transient flow conditions in experiments. These experimental values were compared with results from finite element calculations. It was necessary for the candidate to devise a system for modifying an existing main-frame finite element package …
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Measurements for Wide Area Monitoring, Protection, and Control systems: algorithms, instruments and architectures
… algorithms even in presence of dynamic and transient conditions. As a first step, the thesis explores the evolution of power systems and introduces the role of WAMPAC in modern power grids, illustrating the key components of these systems, including PMUs, and the challenges associated with …
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Supported metal catalysts for water-gas shift conversion
… for mobile and small-scale stationary uses under transient conditions. The PEMFC uses hydrogen and oxygen to generate electrical energy. While oxygen can be obtained from air, hydrogen does not exist in its elemental form; hence a process train is required to refine fuels (such as fossil fuels and …
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Methods of Analyzing the Performance of Induction Machines.
The modeling of induction machines during transient conditions, in order to analyze their effects on the generating station auxiliaries systems, poses some complications for the power system engineer. One concern is establishing realistic motor data for use in modeling large motors. The second is …
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Seepage in earth slopes with longitudinal drainage trenches
… steady state seepage under controlled laboratory conditions. An apparatus capable of simulating different slope angles and trench spacing was utilized in this study. By using this apparatus it was possible to obtain data regarding flow pattern, pressure heads, saturation time, influence of slope …
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Material Characterization of Nitinol Wires for the Design of Actuation Systems
… how the wire behaves under steady state and transient conditions allowing for a specific wire selection to be made given known actuator specifications which will result in an efficient design. The wire transient data can be used to design a controller which reduces the actuation time. The …
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Analysis of a feed-forward priority queueing system
… to ascertain the behavior of the system under transient conditions. Transient results are also obtained from the simulation model. A comparison of the results from the Runge-Kutta and simulation procedures indicate that they agree quite favorably. This agreement aids in substantiating that both …
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The analysis and detection of faults in three phase induction machines using finite element techniques.
… test rig machine having the same fault conditions. The purpose of the work was to enhance present Condition Monitoring techniques. It is accepted that the best way to identify rotor faults on-line (i.e. without affecting machine operation) is to analyse the frequency content of the …
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Fast transient simulation of IEEE recommended surge arrester model on a transmission line using alternative transient program (ATP)
… model. This simulation uses software Alternative Transient Program - Electromagnetic transients Programmed (ATP-EMTP). This software is very appropriate in examining the behavior of the system, especially a high voltage system lines. As a result of the comparison can be made in the system of 132kV …
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Incremental Quantities Based Permissive Overreaching Transfer Trip Scheme for Protecting Inverter-Based Renewable Resources
… remarkable ability to detect a spectrum of fault conditions with a marginal fault current. A spectrum of simulation studies is conducted to test the proposed protection scheme’s effectiveness under various fault conditions and transient change. The proposed solution affirms security during …
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Permeance based modelling, design and optimization of supercapacitor assisted surge absorber (SCASA)
… magnetic material—powdered-iron—that absorbs transients. Despite its high performance, the circuit generates a secondary effect of a negative voltage-peak due to inductive energy release by the core. One aim of our study is to eliminate this undesirable voltage spike using air-gapped ferrite …
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Enhanced next generation alternator
… new concerns regarding the load dump overvoltage transient of alternators. This thesis makes several contributions to the power density, efficiency, and transient performance of future alternators. A comparison and design optimization of four alternator types is conducted to identify the least …
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Transient analysis of hydride fueled pressurized water reactor cores
… as geometry-for maximizing power given specific transient conditions for pressurized water reactors (PWR) loaded with either U02 or UZrH1.6 fuel. Several geometries have been examined with the VIPRE subchannel analysis tool along with MATLAB scripts previously developed to automate VIPRE …
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Development and Verification of Poroelastic Barrier Model With Active Transport: Application in Human Epidermis
… successfully reproducing experimental data under transient conditions. Finally, numerical studies of water transport and redistribution in the epidermis subjected to external insults (change of water evaporation rate and surface hydration, and SC removal by stripping) are presented.
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