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 53 for “"Loss Reduction"”.
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Impeller loss reduction in multi-stage centrifugal compressors
Loss generation features for the first stage impeller in a multistage centrifugal compressor are examined using three-dimensional RANS computations. The calculations were carried out for a baseline configuration and for seven other impeller configurations, with the constraints of constant mass flow …
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Return channel loss reduction in multi-stage centrifugal compressors
… developed to reduce both separation and viscous losses. A number of different features with potential to reduce separation have also been investigated. The final proposed geometry uses a vaneless diffuser which narrows on the shroud side at the beginning of the 180' bend, an axially extended 1800 …
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Design framework for magnet loss reduction in permanent magnet synchronous machines
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Optimal allocation of distributed generation for power loss reduction and voltage profile improvement
… network. These benefits include electrical power losses reduction and voltage profile improvement. Optimal DG location and sizing in a power system distribution network with the aim of reducing system power losses and improving the voltage profile still remain a major problem. Though much research …
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Optimal placement of battery energy storage system for voltage profile improvement and power loss reduction
… total system costs associated with active power losses and voltage profile deviations. The methodology employs a dual-software approach, utilizing MATLAB for optimization algorithms and DigSilent PowerFactory for load flow analyses. Initial assessments establish a baseline scenario without BESS, …
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The integration of nonstructural methods into flood loss reduction programs:an evaluation of a remaining obstacle
… primary criterion. Recent criticism of the flood loss reduction planning is directed at the Corps. One criticism is that the traditional design practices of the Corps address only large flood events. The emphasis on large flood events precludes the use of nonstructural methods, whose economically …
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Determining Sustainability Key Performance Indicators for Food Loss Reduction in the Supply Chain: Empirical Evidence from Jordan
Food loss and food waste in large quantities undoubtedly form one of the most significant global problems affecting our food security and the world’s sustainability development position. Although recent years have witnessed growing research on reducing food loss, most research didn’t evaluate the …
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Effects of Free Stream Turbulence on Compressor Cascade Performance
… was the behavior of the measured total pressure loss coefficient with and without generated free-stream turbulence. A staggered cascade of nine airfoils was tested at a range of Mach numbers between 0.59 and 0.88. The airfoils were tested at both the lowest loss level cascade angle and extreme …
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Experimental and Numerical Investigations of Optimized High-Turning Supercritical Compressor Blades
… blade chord). The test results have shown lower losses and better incidence robustness for the optimized blades at higher supercritical flow conditions (M1>0.83). At the design condition, 30% loss reduction was achieved. The blade-to-blade flow was computed by solving the two-dimensional steady …
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A regulated series-connected power delivery architecture for server clusters in highly efficient datacenters
… power delivery architecture is an essentially lossless way to deliver power directly from a high voltage bus to a number of low-voltage loads. The benefts of this architecture can be combined with voltage regulation of individual nodes through a technique known as differential power processing. …
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Low Loss Integrated Photonic Devices and Their Applications in Astrophotonics and Quantum Information
… platform for photonics is becoming a low-loss and compact platform for various applications such as astrophotonics and quantum information. In this dissertation, the fabrication techniques for low loss integrated photonics devices is first discussed. Then, we present the design, …
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MOSFET Current Source Gate Drivers, Switching Loss Modeling and Frequency Dithering Control for MHz Switching Frequency DC-DC Converters
… transition times and therefore switching loss in power MOSFETs. In addition, it can recover a portion of the gate energy normally dissipated in a conventional driver. Demonstrated loss reduction of 24.8% at 10V/5A load are presented in comparison to a conventional voltage source driver for …
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Centrifugal compressor return channel shape optimization using adjoint method
… to centrifugal compressor return channel loss reduction. A proper objective function definition and a generalized geometry parametrization and manipulation algorithm were developed, and the appropriate adjoint equations and boundary conditions were derived for internal flow of an …
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Comprehensive loss optimization of induction motor drives
… past few decades has enabled the development of loss minimization control algorithms. With the technological advancements in power semiconductor switching devices such as insulated gate bipolar transistors and gate commutated thyristors, induction motor drives are increasingly used in …
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High Power High Frequency 3-level NPC Power Conversion System
… converter is carefully designed to achieve low loss and stress for high frequency and high power operation. The switching characteristics for all the commutation loops of 3-level phase leg are evaluated by double pulse tests. The switching performance is optimized for loss and stress tradeoff. A …
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A planning scheme for penetrating embedded generation in power distribution grids
… benefit, in terms of power delivery loss reduction, and restricts its adverse impact of steady-state voltage rise. A unique approach is taken to simplify the DG penetration problem with two sets of rules that describes the interaction of DG penetration and power delivery loss and …
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A Comprehensive Method For Coordinating Distributed Energy Resources In A Power Distribution System
… infrastructure presents various benefits such as loss reduction, resilience against cascading failures and access to more diversified resources. However, serious challenges and risks must be addressed to ensure continuity and reliability of service. By integrating necessary communication and …
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