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 44 for “"Fault-Tree Analysis"”.
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Functional safety fault tree analysis of a model autonomous haulage system
… is accomplished by developing a generic fault tree to define exposures and failure modes of an AHS. Representative scenarios simulating various mining environments and situations are utilized to define the typical exposures in an AHS deployment. Through the implementation of a systematic …
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Fault tree analysis and diagnostics development for PI-in-a-box with neurolab sleep and respiration experiment
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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An exploration of the applicability and utility of fault tree analysis to the diffusion of technological innovation in educational systems
… developed in the late 1950s and early 1960s, Fault Tree Analysis [FTA] examines systems in terms of potential failure. The purpose of the technique is to improve the likelihood of successful attainment of a specified goal. In this study, qualitative research methods were used to examine the …
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Návrh konstrukce strojní pásové brusky
… využívají. S pomocí kvalitativních metod Fault Tree Analysis a Quality Function Deployment, je zde i detailněji rozebrána celá problematika tak, aby bylo snáze pochopitelné téma pásové brusky. V další části práce jsou vypočteny potřebné parametry, a poté vymodelována konstrukce pásové …
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UAS Risk Analysis using Bayesian Belief Networks: An Application to the VirginiaTech ESPAARO
… to investigate alternative methods of failure analysis. This thesis proposes a method of expanding on the Fault Tree Analysis (FTA) method to a Bayesian Belief Network (BBN) model. FTA is demonstrated to be a special case of BBN and BBN can allow for more complex interactions between nodes than …
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Advanced Quantitative Risk Assessment of Offshore Gas Pipeline Systems
… frameworks of aggregative risk assessment and fault tree analysis are developed. Aggregative risk assessment is to evaluate the risk levels of components, subsystems, and the overall OGSS. Fault trees are then used to represent the cause-effect relationships for a specific risk in the system. …
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Probabilistic risk assessment of system-level radiation effects
System-level radiation effects analysis is performed using a time-dependent Probabilistic Risk Assessment (PRA) methodology. Data-driven models for the expected behavior of radiation-sensitive parts are instanced in a system model for Fault Tree Analysis (FTA). The system model is then solved using …
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Multi-state system in a fault tree analsis of a nuclear based thermochemical hydrogen plant
… tragedies can be avoided with effective risk analysis and safety management programs. As a powerful and systematic tool, fault tree analysis (FTA) is adapted to the particular needs of the Cu-Cl system. This thesis develops a new method that combines FTA with a reliability analysis tool, …
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An Evidence Theoretic Approach to Design of Reliable Low-Cost UAVs
… in'' reliability in a cost-effective way. Fault Tree Analysis is used to evaluate a system's (un)reliability and Dempster-Shafer Theory (Evidence Theory) is used to deal with imprecise failure data. Three unique sensitivity analyses highlight the most cost-effective improvement for the …
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Reliability Analysis for Hazard and Operability Studies
Fault tree analysis is used as a tool within hazard and operability (Hazop) studies. The present study proposes a new methodology for obtaining the exact TOP event probability of coherent fault trees. The technique uses a top-down approach similar to that of FATRAM. This new Fault Tree Disjoint …
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Supply chain risk analysis
… to provide a common platform for performing risk analysis in a supply chain. The system performs a risk analysis and calculates risk factor with each activity in the supply considering its interrelationship with other activities. Bayesian networks along with fault tree structures are embedded in …
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System theoretic approach for determining causal factors of quality loss in complex system design
… design methods such as Failure Modes and Effects Analysis (FMEA), Fault Tree Analysis (FTA), and Robust Design have been proven effective at the component level but are less effective for factors that involve interactions between components, software flaws and external noises. This thesis applies …
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Petri net modeling of fault analysis for probabilistic risk assessment
Fault trees and event trees have been widely accepted as the modeling strategy to perform Probabilistic Risk Assessment (PRA). However, there are several limitations associated with fault tree/event tree modeling. These include 1. It only considers binary events; 2. It assumes independence among …
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Generating structurally complex tests from declarative constraints
… naming scheme for dynamic networks and a fault-tree analysis system developed for NASA.
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Extending and automating a systems-theoretic hazard analysis for requirements generation and analysis
Systems Theoretic Process Analysis (STPA) is a powerful new hazard analysis method designed to go beyond traditional safety techniques-such as Fault Tree Analysis (FTA)-that overlook important causes of accidents like flawed requirements, dysfunctional component interactions, and software errors. …
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Systems Theoretic Process Analysis applied to an Offshore Supply Vessel dynamic positioning system
… the effectiveness of Systems Theoretic Process Analysis (STPA) and the advantages that result from using this new safety analysis method compared to traditional techniques. To do this, STPA was used to analyze a case study involving Naval Offshore Supply Vessels (OSV) that incorporate …
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Automated Radiotherapy Treatment Planning for Breast Cancer: A Robust to ol for Global Deployment
… assessment of plan quality via dosimetric analysis and physicist review. The rate of automated plans requiring edits was compared across treatment sites, and fault tree analysis was employed to elucidate underlying reasons for any modifications.</p> <p>Automated contouring achieved DSC …
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Dynamic safety assessment of FPGA-based safety critical systems with applications in nuclear power generation
… considered the application of a new safety analysis methodology for the modelling and analysis of FPGA-based systems. The methodology chosen is a modern, dynamic (time-dependant) methodology known as the Dynamic Flowgraph Methodology (DFM), which is intended to be applied to digital I&C …
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Expert systems for fault analysis
… Studies. Due to the generic nature of Fault Analysis problems and the way in which Knowledge Base Systems work, this goal has evolved into a consideration of automated support for Fault Analysis in general, covering HAZOP, Fault Tree Analysis, FMEA and Fault Diagnosis in the Process …
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