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 219 for “"performance requirements"”.
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Analysis in circuit breaker performance requirements for high-voltage DC networks
… of multi-terminal systems. In this thesis the requirements of the converter, dc breakers and overall HVDC network are reassessed. The factors influencing stress within the converter and breaker are quantified. Design adjustments which may be used to mitigate these are then investigated. …
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Investigating the performance requirements for proprietary concrete repair materials with respect to durability and cracking resistance
… codes and technical guidelines for BCOs. The performance requirements for BCOs stated in these standards vary. This makes the specification of repair materials difficult. This problem is further compounded by the existence of many proprietary concrete repair materials. The objective of this …
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Integrated modeling to facilitate control architecture design for lightweight space telescopes
… the effects of utilizing control to better meet performance and systematic requirements of future space telescopes. New telescope systems are moving toward tighter optical performance requirements with lower mass and cost, creating an implicit conflict for currently designed systems. Therefore, …
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Design methodology using empirical and virtual analysis with application to compliant systems
… designs satisfying engineering and customer requirements is a primary purpose of existing methods. Numerical and experimental techniques often can determine the feasibility of meeting the specified performance requirements.
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A Framework for Assessing the Reliability of Wind Energy Conversion Systems
… in a simplified grid model. Fault parameters and performance requirements essential to reliability measurements are included in the simulation. The proposed framework allows a quantitative analysis of WECS designs; analysis of WECS control schemes, e.g., fault ride-through mechanisms; discovery of …
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Design of nanomanufacturing systems
… of new technology to fulfill the unique performance requirements of nanomanufacturing processes. First, an introduction to nanomanufacturing and the differences between macro-scale and nano-scale manufacturing will be presented. Second, a "metric mapping" method will be illustrated which …
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Dynamic tailoring and tuning for space-based precision optical structures
… imaging techniques to achieve high optical performance with limited launch mass. Structurally-connected Michelson interferometers meet these demands, but pose specific challenges in the areas of system dynamics and controls, uncertainty management and testing. The telescope optics must meet …
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A pipelined analog-to-digital converter with low-gain, low-bandwidth op-amps
… technique. The proposed technique relaxes op-amp performance requirements by removing op-amp-induced charge-transfer errors in the digital domain. A proof-of-concept pipelined ADC has been designed in 28nm FDSOI CMOS technology and is currently being fabricated.
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Significance of nanosilica incorporation in type G oil well cement pastes
… well cement (OWC). OWC slurries have stringent performance requirements, including low viscosity, rapid strength development, low permeability and enhanced degradation resistance. Preliminary research work showed that nanosilica is capable of reducing OWC porosity and therefore is was thought …
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The influence of alloy composition and interfacial segregants on the fracture and fatigue of metal/ceramic interfaces
… industries is becoming more common as performance requirements exceed the capabilities of homogeneous materials. As a result, the need to assess their failure is critical. Diffusion bonded joints, thermal-barrier and wear resistant coatings, and thin films in VLSI electronics are three …
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A tool for reliability analysis of electrical power systems
… remains operational within some acceptable performance requirements. The tool’s computational engine automatically builds a Markov reliability model of the system under analysis from a Simulink/PLECS description of the system augmented to include fault behavior in passive components of the …
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Network flow optimization for distributed clouds
… geo-distributed and typically have stringent performance constraints. The interconnecting networks, within and across data centers, are critical in determining these applications' performance. Data centers can be viewed as composed of three layers: physical infrastructure consisting of …
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Design, verification and automatic implementation of correct-by-construction distributed transaction systems in Maude
… such that they satisfy desired correctness and performance requirements; and (ii) transforming verified system designs into correct-by-construction distributed implementations. Regarding correctness requirements, we provide an object-based framework for formally modeling DTSs in Maude, explain …
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An expert system for preliminary selection of hydrostatic transmission components
… components, selecting components, evaluating the performance of selected units, and then adjusting or selecting alternate components for improved performance. A. rule-based expert system, called HSTX, was developed to aid the selection and sizing of the major components-- pump, motor, and final …
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A Correlation of Microstructure With Hot-Ductility in the Heat-Affected Zone of Inconel 718.
Increased performance requirements for structural components and the demand for materials with enhanced properties have significantly increased the problems involved in producing sound welds. Due to the high temperatures and steep temperature gradients in the vicinity of welds, high stresses and …
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Design & Development of Short Benchtop Welding Positioner
… for spindle height and thru bore diameter and performance requirements, such as speed. Preliminary static analyses are conducted on the subsystems with the heaviest design consideration to ensure they meet the spindle’s requirements. The design takes into account the spindle’s …
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Building Personal Software with Reactive Databases
… with rich interactions and stringent performance requirements. Together, these projects empower both end users and application developers with simpler tools for developing software.
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Applicability of linear analysis in probabilistic estimation of seismic building damage to reinforced-concrete structures
As design has moved from strength based to performance based, there has been an effort to relate building response to damage. Because decision-makers typically consider human lives, property damage and cost, setting performance requirements in terms of the damage that a building is likely to …
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