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 13 of 13 for “"Performance maps"”.
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Fuel element performance maps for nuclear reactor operational decisions.
Thesis. 1978. Nucl.E.--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
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Radiofrequency detector coil performance maps for parallel MRI applications
… A procedure to evaluate the absolute performance of RF coil arrays is proposed. Electromagnetic calculations to compute the ultimate intrinsic signal-to-noise ratio (SNR) available for any physically realizable coil array are shown, and coil performance maps are generated based on the …
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Head augmentation in hydraulic turbines by means of draft tube ejectors
… The numerical model was used to generate performance maps of full scale, low-head systems in the range from 200 to 500 kW. The performance maps were then used in a system modeling program to evaluate the system performance, cost and cavitation characteristics. The draft tube ejector system …
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Environmental Design Space model assessment
… by sensitivity studies on the inputs, component performance maps, and constraints. An alternate method of applying additional constraints to EDS results is also investigated. Finally, the model uncertainty is quantified using Monte Carlo simulations. This includes a study where all the inputs are …
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A design framework for reconfigurable controllers with emphasis on electric drive wheels
… does not have the ability to control the performance in real time due to lack of available controller choices. However, electric and hybrid electric vehicles need to operate over a wider set of operating conditions, therefore controllers for their traction motors need to be designed to …
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Coil performance evaluation based on electrodynamics : tools for hardware design and validation in magnetic resonance imaging
… A procedure to evaluate the absolute performance of RF coil arrays is proposed. Electromagnetic calculations to compute the ultimate intrinsic signal-to-noise ratio (SNR) available for any physically realizable coil array are shown, and coil performance maps are generated based on the …
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Experimental investigations of oxygen-separating ion transport membranes for clean fuel synthesis
… simulations of ITM reactors to produce flux performance maps based on the input operating conditions.
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High compression ratio turbo gasoline engine operation using alcohol enhancement
… be tested in the experimental setup and generate performance maps which could be used to predict how the engine would act inside of a vehicle. It was found that increasing the compression ratio from 9.2 to 13.5 leads to a 7% relative increase in part load efficiency. When applied in a vehicle this …
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Aerodynamics of Low Pressure Steam Turbine Exhaust Systems
… presents a promising avenue for improving the performance of large steam turbines. For this reason, LP exhaust systems have attracted the attention of the research community for decades. Nevertheless, we still lack understanding of the flow physics and loss mechanisms in the exhaust system, …
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The design and analysis of radial inflow turbines implemented within low temperature organic Rankine cycles
… that considers the trade-o_ between system performance and system complexity. Following a cycle analysis case study, a radial inflow turbine design method for ORC turbines is developed which extends existing ideal gas design methods to be applicable for real gases. Two candidate turbine …
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Contribution to the Characterization of Piston Expanders for Their Use in Small-scale Power Production Systems
… valve timing and the evaluation of the potential performances. The main modifications made to turn an available Internal Combustion Engine (ICE) into an Ericsson engine are described. This prototype is then tested but did not run as expected. The identified reasons are a too high leakage rate, a …
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Design of a viable homogeneous-charge compression-ignition (HCCI) engine : a computational study with detailed chemical kinetics
… conditions on the HCCI viable operating range. Performance maps, which show the response of the engine during a normal driving cycle, were constructed to compare these engine designs. The simulations showed that an acceptably broad operating range can be achieved by using a low compression …
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Standardization for intelligent detection and autonomous operation of non-structured hardware, and its application on railcar brake release operation
This thesis introduces a standard framework for evaluating and planning for desired autonomous (or semi-autonomous) operations, then applies the framework, in detail, to the task of automating emergency brake release before rail-car decoupling. A significant hurdle to be accounted for is the lack …