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Showing 1 to 10 of 10 for “"NPSS"”.
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Performance and Emissions Study of N+3 and N+4 Engine Models with Several Fuel types Using NPSS
… simulation is performed on the software called NPSS which is a component-based object-oriented engine cycle analysis and simulation tool. Liquid hydrogen (LH2), liquefied natural gas (LNG), ammonia (NH3), and ammonia-borane (AB) are explored as alternative fuel sources alternative to …
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Understanding and Optimizing Nanophase Separation Sintering
… the materials. Nanophase separation sintering (NPSS) was first explored by Dr. Mansoo Park. In this process, a mechanically alloyed powder experiences phase separation on the surface. This second phase promotes neck formation and rapid densification. By being a solid state process, parts made …
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Scene-Dependency of Spatial Image Quality Metrics
… using adaptive processes, the resultant MTFs and NPSs are not representative of performance “in the field” (i.e. capturing real scenes). Spatial image quality metrics for capturing systems aim to predict the relationship between MTF and NPS measurements and subjective ratings of image quality. …
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Innovative Double Bypass Engine for Increased Performance
… from Numerical Propulsion Simulation System (NPSS) software and were found to be within 4% error. Flow performance characteristics were also determined and validated against their criteria.</p>
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Investigation of Pulse Detonation Engine Flow Conditions for Turbomachinery Integration
… using Numerical Propulsion System Simulation (NPSS). This model captures the sharp peaks in flow property variation without the need for expensive computational resources, outperforming other simplified approaches in the literature. With this simplified model, tools may be developed to carry …
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Development of an engine model for an integrated aircraft design tool
… techniques on data data generated from NPSS/WATE++ and then combined to estimate a "bare" engine weight-including only the fan, compressor, turbine, and combustor-and a total engine weight, which also includes the nacelle, nozzle, and pylon. The new model estimates bare engine weight …
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Effects of Fuel Split Ratio on NOₓ Emissions of a Lean-burn Staged Combustor
… are compared. Chemical reactor networks, NPSS engine cycle models, and a TASOPT flight mission model are utilized. In comparison to previous studies, a wider range of pilot fuel fraction, from 16% to 100%, are tested over more refined thrust cases, from 0% to 100% rated thrust. A wider …
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Modeling and simulation of commercial aircraft electrical systems
… in Numerical Propulsion System Simulation (NPSS). The following scenarios were simulated: no fault or failure, temporary disconnection between generator and load, and single-generator failure. All of the simulations were conducted using a similar flight profile with small adjustments for the …
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Functional Analysis of Secondary Metabolite Biosynthesis-Related Genes in Alternaria brassicicola
… seven nonribosomal peptide synthetases (NPSs) and 10 polyketide synthases (PKSs) in the A. brassicicola genome. The phenotype resulting from knockout mutations of each PKS and NPS gene was investigated with an emphasis on discovery of fungal virulence factors. A highly efficient gene …
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Applying Probabilistic Risk Assessment to Agricultural Nonpoint Source Pollution
… of excessive nitrogen from nonpoint sources (NPSs) to a stream was performed for a small agricultural watershed in northern Virginia. Risk, by definition, is the product of the frequency of occurrence of an event and the consequences of that event. The purpose of this research was to determine …