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 72 for “"failure probability"”.
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The effect of material property variations on the failure probability of an AGR moderator brick subject to irradiation induced self stress
The failure of graphite moderator bricks in an Advanced Gascooled Reactor (AGR) is potentially a serious problem. This thesisdescribes the generation of self stress in the moderator brick during irradiation and the derivation of a simple analytical model to predict the magnitude of this stress. The …
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Utilization of the Distributed-Hydrology-Soil-Vegetation-Model (DHSVM) To Quantify Streamflow Changes and Slope Failure Probability Following the Snow-Talon Fire Near Lincoln Montana, USA
… was used to identify regions of higher soil failure probability and estimates of pre and post-disturbance stream flows. Because DHSVM is a physically-based distributed parameter model it allowed for the use of high resolution data that more accurately represented landscape parameters such as …
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Utilization of the Distributed-Hydrology-Soil-Vegetation-Model (DHSVM) To Quantify Streamflow Changes and Slope Failure Probability Following the Snow-Talon Fire Near Lincoln Montana, USA
… was used to identify regions of higher soil failure probability and estimates of pre and post-disturbance stream flows. Because DHSVM is a physically-based distributed parameter model it allowed for the use of high resolution data that more accurately represented landscape parameters such as …
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Risk-informed design changes for a passive cooling system
The failure probability of a passive decay heat removal system after a LOCA is evaluated as part of a risk-informed design process for a helium-cooled fast reactor. The system was modeled using RELAP5-3D. The epistemic uncertainties in input parameters as well as the epistemic model uncertainties …
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Probabilistic Seismic Assessment of Structure, Foundation, and Soil Interacting Systems
… direction are most vulnerable components. Failure probability of the bridge system is highly dependent on the failure probability of abutment bearings. Among the four approaches, the fixed foundation approach underestimated the failure probability of all bridge components except abutment …
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Response Surface Method for Time-Variant Reliability Analysis
… from response time histories. The structural failure probability conditional upon the uncertain system parameter values is assumed to follow an extreme value distribution, the parameters of which are fitted by the response surface models. The fast integration scheme provides a formulation of a …
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Survivability in layered networks
In layered networks, a single failure at the lower (physical) layer may cause multiple failures at the upper (logical) layer. As a result, traditional schemes that protect against single failures may not be effective in layered networks. This thesis studies the problem of maximizing network …
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Design optimization and analysis of coated particle fuel using advanced fuel performance modeling techniques
… higher fracture toughness leads to a lower fuel failure probability, as expected. However, the results from the BAF variations reveal that a higher BAF lowers a fuel failure probability. This quite contradicts the generally believed notion that a higher BAF would increase fuel failures. In …
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Improved methods for fast system reliability analysis through machine-learning-based surrogate models
… making. The specific problem of determining the probability that two nodes in an infrastructure network are disconnected given the edge failure probabilities is known as the two-terminal connectivity problem, a special case of the k-terminal reliability problem. Both problems are known to be …
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Advanced thermal hydraulic simulations for human reliability assessment of nuclear power plants
… of thermal hydraulic (TH) uncertainties upon the failure probabilities of the operator actions of nuclear units. I demonstrate in this work that there is an effect of TH uncertainties on the operating crew's probability of recognizing errors during a loss of coolant accident (LOCA) initiating …
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System reliability analysis of structures subjected to fatigue induced sequential failures using evolutionary algorithms
In the past, many catastrophic failures have occurred due to lack of redundancy and managerial oversight. For example, it was found that local failures due to improper welds that connected the suspended truss to the anchor trusses caused the collapse of the Grand Sung-Soo Bridge in Seoul, South …
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Confiabilidade de estruturas reticuladas em ambientes de processamento paralelo
… reliability theory was used to asses the nominal failure probability of framed structures. A elast-plastic limit state function to structural elements and specialists methods were used for this purpose. A method to identify the most likely failure modes was developed. The software was implemented …
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Segmental multi-point linearization for topology optimization and reliability analysis
… correctly regardless of how accurate the failure probability is approximated. A segmental multi-point linearization (SML) method is proposed for a more accurate estimation of failure probability and its gradient. Numerical examples show that the RBTO algorithm based on the SML is more …
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Analysis of bulging, bursting, and reliability-based design and optimization for pipelines
Pipelines are subjected to bursting failure under many operating conditions. Predicting the burst capacities of corroded pipelines is significantly relevant to the pipeline industry. The tube bulge test is an advanced testing process used to predict burst capacity, whereby a tube is placed in a die …
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Benchmarking of the MIT High Temperature Gas-cooled Reactor TRISO-coated particle fuel performance model
… of coated particles and to determine the failure probability of each of the structural coating layers. With this, the code determines the overall particle failure rate. TIMCOAT represents a significant advancement over earlier codes as it includes a pyrocarbon crack induced particle …
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ΜΕΤΑΒΑΤΙΚΗ ΚΑΤΑΣΤΑΣΗ ΛΕΙΤΟΥΡΓΙΑΣ ΟΞΕΙΔΩΤΙΚΗΣ ΠΑΓΙΔΑΣ ΣΩΜΑΤΙΔΙΩΝ ΚΑΥΣΑΕΡΙΟΥ ΚΙΝΗΤΗΡΩΝ DIESEL
… WALL TEMPERATURE AT TRAPOUTLET AND FORECASTS THE FAILURE PROBABILITY OF THE CERAMIC MATERIAL UNDER SPECIFIC CONDITIONS AT TRAP INLET.
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Analysis of Factors that Influence Member Turnover in a Health Insurance Plan
… this, the contribution of each variable to the failure probability can be assessed. Due to this restriction on the coefficients, a Bayesian approach to parameter estimation--which assigns mixture priors to the coefficients--is taken. The data is provided by a large health insurance company in …
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Static and Seismic Stability of Cut Slopes in Terms of Reliability
… overconsolidated clay considering progressive failure as the critical failure mode. The stress condition along a potential failure surface both prior to and after an excavation is investigated by finite-element elasto-plastic analysis; in this process, a potential failure surface is modeled as …
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STRUCTURAL RELIABILITY ANALYSIS BASED ON MAXIMUM ENTROPY DISTRIBUTION WITH FRACTIONAL MOMENTS
Structural reliability analysis involves low-probability-failure prediction to account for the rare events occurrence rate. To predict the low probability of failure of offshore drilling riser system accurately and efficiently is crucial but challenging. An improved univariate density estimation …
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Design of robust spin-transfer torque magnetic random access memories for ultralow power high performance on-chip cache applications
… write operations are the same. Read and write failures of STT-MRAMs are degraded further under process variations. The focus of this dissertation is to optimize the yield of STT- MRAMs under process variations by employing device-circuit-architecture co-design techniques. A devices-to-systems …
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