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 42 for “"Catastrophic Failures"”.
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Robust Electric Power Infrastructures. Response and Recovery during Catastrophic Failures
This dissertation is a systematic study of artificial neural networks (ANN) applications in power system restoration (PSR). PSR is based on available generation and load to be restored analysis. A literature review showed that the conventional PSR methods, i.e. the pre-established guidelines, the …
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Risk Assessment of Power System Catastrophic Failures and Hidden Failure Monitoring & Control System
… that evaluate, in a power system, the risks of catastrophic failures caused by hidden failures in the hardware or software components of the protection system. The disturbance propagation mechanism is revealed by the analysis of the 1977 New York Blackout. The step-by-step process of estimating …
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Nonlinear dynamic analysis of wind turbine towers subject to design wind and seismic loads
… Axis Wind Turbines (HAWT) may experience catastrophic failures due to very strong wind and/or seismic loads. Such loads, if not properly addressed, may result in excessive deformations which, in turn, may cause significant damage, or even collapse of wind turbines. This research proposes …
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Experimental Detection and Quantitative Interrogation of Damage in a Jointed Composite Structure
… applications. Research is motivated by catastrophic failures of operational systems which may have been avoided with the prior implementation of a successful damage prediction method. This research utilizes a smart sensor array to collect sensing information over a variety of damaged …
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Using avalanche statistics to forecast failure in models of earthquake faults and magnets
… forces, as well and their susceptibility to catastrophic failures. In this thesis, I present my work using models of avalanche statistics to study large failure avalanches. In particular, I use these avalanche models to explore statistical signals which can predict the likelihood of large …
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High resolution scattering measurements for stationary particles
… ingestion in propulsion engines can lead to catastrophic failures. It has been shown laser based methodologies can determine size and concentration of spherical particles by using light extinction. However, when one moves to increasingly complex shapes one must take into consideration not …
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Development of techniques to determine temperature coefficient of resistance
… probe on a polycarbonate surface due to catastrophic failures in the film, most likely caused by the different thermal expansion rates of the carbon and polycarbonate. Further research should be conducted to first find a more suitable temperature probe for polycarbonate and then conduct …
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Detection and assessment of high temperature hydrogen attack in steel pressure vessels using non-collinear wave mixing
… for a long time. HTHA can result in sudden, catastrophic failures that are costly and dangerous. Prevention of this type of damage is of paramount importance, however no current detection technique is capable of non-destructively and reliably assessing the level of damage in HTHA affected …
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Quantification of extreme event statistics in ship design
… service life, making the accurate prediction of catastrophic failures increasingly challenging. The high value of these capital assets puts great pressure on designers and decision-makers as they work towards preventing such failures while balancing both engineering and material cost. The current …
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Characterizing the failure of parachute seams : the impact of stitch concentration and strain rate on ultimate tensile strength
… There are many possible failure modes, but catastrophic failures are caused by failures at the weakest point of the parachute, the seam. Seams are characterized by a seam efficiency, a percentage of the strength of the cloth used to stitch the seam together. In this study, seams and cloth …
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Applications of risk pooling for the optimization of spare parts with stochastic demand within large scale networks
… Unfortunately, this reliance on MHE means that failures could cripple an entire FC. The exceptionally high stock-out cost associated with equipment failure means spare parts must always available when required. This is made difficult as Amazon does not hold any central repository of inventory at …
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An Integrated Real options Framework for model-based identification and valuation of options under uncertainty
… that may lead to suboptimal performance or even catastrophic failures if unmanaged. This work focuses on flexibility as an important means of managing uncertainties and leverages real options analysis that provides a theoretical foundation for quantifying the value of flexibility. Real options …
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Probabilistic engineering analysis and design under time-dependent uncertainty
… in the design process may result in catastrophic failures after the designed products are put into operation. Although significant progress has been made in probabilistic engineering design, quantifying and mitigating the effects of time-dependent uncertainty is still challenging. …
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Robust Nonlinear Estimation and Control Applications using Synthetic Jet Actuators
… could potentially lead to structural damage and catastrophic failures. LCO can be described as vibrational motions in the rocking, pitching and plunging displacements of an aircraft wing. To address this, the use of synthetic jet actuators (SJAs) in UAV flight control systems is becoming popular …
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Characterizing tailings professional labor demand
… legacies of environmental damage and recent catastrophic failures of tailings (mine waste) facilities. To regain social trust and environmental credibility, the mining industry must do better at managing tailings. The recently issued Global Industry Standard on Tailings Management (GISTM) …
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Nonlinear Analysis and Control of Aeroelastic Systems
… LCOs can result in fatigue in wings leading to catastrophic failures. Existence of LCOs for velocities less than the linear flutter velocity has been observed during flight and wind tunnel tests, making such subcritical behavior highly undesirable. The objective of this dissertation is to …
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Resilience of an embedded architecture using hardware redundancy
… or system level, which in turn, can result in catastrophic failures. In this work we study the concepts of fault tolerance and dependability and extend these concepts providing our own definition of resilience. We analyse the physics of radiation-induced faults, the damage mechanisms of …
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Experimental surface heat flux measurement in hypervelocity flows
… of heat transfer rates can result in catastrophic failures during flight testing. An example which illustrates the importance of heat transfer during hypersonic flight is the destruction of the space shuttle Columbia during the re-entry portion of STS-107. The shuttle experienced …
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Condition assessment using dissolved gas analysis on transmission power transformers
… reduce the risks of unplanned outages as well as catastrophic failures. The objective of this research is to evaluate the effectiveness of the Low Energy Degradation Triangle (LEDT) technique for the early detection of incipient faults evolving in transmission power transformers and reactors. …
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Policy and Design Courses of Action to Improve Resilience of Proliferated Low Earth Orbit Constellations Against Adverse Solar Weather
… to historically observed events induce catastrophic failures to current New Space mega-constellations? 2) How do increasing levels of constellation proliferation alter resilience to adverse solar weather? And 3) How do increasing levels of constellation proliferation alter the …
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