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.
Results
Showing 1 to 20 of 62 for “"Fault Tree"”.
-
Expert systems for fault tree synthesis
… serious errors or omissions. An aid to HAZOP are fault trees, which present the system failure logic graphically such that the study team can readily assimilate their findings. Fault trees are also useful to the identification of design weaknesses, and may additionally be used to estimate the …
-
Usability evaluation of a fault tree software user documentation
… was used to identify usability problems in a fault free software user document. The critical incidents were used to modify the original document to improve its usability. To test whether the modified document was better in usability than the original document, an experiment was conducted to …
-
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 …
-
Multi-state system in a fault tree analsis of a nuclear based thermochemical hydrogen plant
… 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, multi-state system (MSS), to improve the accuracy of FTA and also improve system …
-
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.
-
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 …
-
Applying Probabilistic Risk Assessment to Agricultural Nonpoint Source Pollution
… assumed to be negative in nature. An event tree was developed to show the basic hydrologic processes at work in a small watershed. However, the event tree could not be used to discover the causes for nitrogen loss from the watershed. Therefore, a fault tree was developed for excessive …
-
A novel safety analysis method for marine cyber-physical systems
… existing hazard identification methods such as Fault Tree Analysis (FTA), Failure Modes and Effects Analysis and System-Theoretic Process Analysis (STPA) applications to the CPSs have been criticised for not capturing either the software-intensive character of CPSs or not allowing for …
-
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 …
-
Product promotion effectiveness : root causes of stock-outs
… These responses are used to create a fault-tree diagram that shows how different states could be reached. The root-causes mentioned in the fault-tree diagram are classified as either qualitative or quantitative root-causes. The credibility of quantitative root causes was established …
-
Fail-Safe Testing of Safety-Critical Systems
… systems. It is based on a behavioral and a fault model. The two models are analyzed for compatibility and necessary changes are identified to make them compatible. Then transformation rules are used to transform the fault model into the same model type as the behavioral model. Integration …
-
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 …
-
Pandora : a logic for the qualitative analysis of temporal fault trees
Fault Tree Analysis (FTA) is a valuable systems analysis technique widely used in safety analysis and reliability engineering, but it is not without its faults; in particular, it struggles to analyse systems in which time plays an important role, because fault trees use only Boolean logic and so …
-
Supply chain risk analysis
… other activities. Bayesian networks along with fault tree structures are embedded in the system and logical rules are used to perform a qualitative fault tree analysis, as the data required to calculate the frequency of occurrence is rarely available. The developed system guides the risk …
-
Reliability-based nuclear power plant maintenance resource allocation in order to reduce unfavorable operational publicity
… systems did not. Risk analysis with fault tree modeling was carried out to quantify risk of major components in turbine-generator systems, and in nuclear steam supply systems. The risk was evaluated in terms of the frequency of unplanned shutdowns in order to identify which components …
-
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 …
-
Concept of Operations and Failure Analysis for a Complex Deployable CubeSat Antenna Payload
… concept of operations. For this purpose, a Fault Tree Analysis is performed for each stage of the deployment sequence. After constructing these fault trees, available telemetry points for the identification of these failure are indicated, allowing for the categorization of failures into …
Page 1 of 4