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 101 for “"system failure"”.
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Control system failure monitoring using generalized parity relations
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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A system failure detection method -- failure projection method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.
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Relationship Between Metabolic By-Products and Nervous System Failure/Fatigue
… unknown is the contribution the nervous system has upon fatigue. Therefore, the purpose of this dissertation was to investigate potential mechanisms that relate to neural fatigue. An additional purpose was to determine if there were any relationships between metabolic by-products and EMG …
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Modeling repairable system failure data using NHPP reliability growth mode.
… used to describe the behaviour of repairable systems. The Crow nonhomogeneous Poisson process (NHPP) often known as the Power Law model is regarded as one of the best models for repairable systems. The goodness-of-fit test rejects the intensity function of the power law model, and so the …
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An audit of emergency hernia operations: Surrogate of system failure or incidentalomas?
… Aim: We aim to elucidate patient and health care systems factors that contribute to hernia emergency presentations and to document the mortality and morbidity of such presentations in our unit. Method: We aim to review case files of all patients above 18 years of age who had their emergency …
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Experiments and a model of pilot system failure detection during simulated Lunar landing
Future complex systems, such as those found in piloted aircraft and spacecraft, will undoubtedly utilize significant automation to enhance pilot capabilities and enable novel mission scenarios. Off-nominal conditions may arise, such as failures of automation or other systems, and the ability of a …
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Designing and developing a robust automated log file analysis framework for debugging complex system failure
As engineering and computer systems become larger and more complex, additional challenges around the development, management and maintenance of these systems materialize. While these systems afford greater flexibility and capability, debugging failures that occur during the operation of these …
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The Spatial Relationship Between Septic System Failure and Environmental Factors in Washington Township, Marion County, Indiana
Underground septic systems thrive or fail based on the relationship with their local environment. This paper explores ways environmental variables such as soil type, tree roots, degree of slope, and impervious surfaces affect on-site wastewater treatment systems. It also discusses the effects each …
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Managing the Risk of Failure in Complex Systems: Insight into the Space Shuttle Challenger Failure
… assessing, mitigating, and managing the risks of failure in complex systems. It describes the paradigm commonly used today to explain such failures and proposes an alternative paradigm that expands the lens for viewing failures to include alternative theories derived from modern theories of …
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RISK-BASED FRAMEWORK FOR SAFETY MANAGEMENT OF ONSHORE TANK FARM OPERATIONS
… become an important element in the supply chain system because of the increased universal energy demand and the fact that large number of modern tanker vessel is busy and efficiently moving cargo to different destinations around the world. The tank farm serves as a back-up facility to the ports. …
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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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A two step predictor-corrector method for voltage collapse point estimation
Voltage Collapse is the system failure to obtain acceptable voltage levels in significant part of the power system, and it is often due to system failure to satisfy reactive power demand. Voltage Collapse can lead to blackout like the one occurred in 2003 in North America. Methods for on-line …
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A Statistical Evaluation of Risk Priority Numbers in Failure Modes and Effects Analysis Applied to the Prediction of Complex Systems
<p>Complex systems such as military aircraft and naval ships are difficult to cost effectively maintain. Frequently, large-scale maintenance of complex systems (i.e., a naval vessel) is based on the reduction of the system to its base subcomponents and the use of manufacturer-suggested, …
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Risk Management of Electronic Health Record System in Hospitals
… the use of electronic medical record (EMR) systems and risk management in hospitals. It provides a critical analysis of recognized EMR systems and potential failures and discusses six traditional risk management techniques including brain storming, cause, effect analysis, failure mode …
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Petri net modeling of fault analysis for probabilistic risk assessment
… as a simulation tool for queuing and network systems. However, it has been suggested that they could also model failure scenarios, and thus could be a potential modeling strategy for PRA. In this thesis, the transformations required to model logic gates in a fault tree by Petri nets are …
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Transient fault detection using a watchdog processor
… is required. For instance, satellite based systems operating in space have no way being serviced if something were goes wrong. Often these systems, operating in radiation environments, are subject to random high energy particles that pass through the device and upset the operation of the …
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A unified methodology of maintenance management for repairable systems based on optimal stopping theory
… study of maintenance management for repairable systems based on optimal stopping theory. From reliability engineering’s point of view, all systems are subject to deterioration with age and usage. System deterioration can take various forms, including wear, fatigue, fracture, cracking, breaking, …
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A fracture-based approach to understanding debonding in FRP bonded structural members
… mechanics approach was developed to describe the system failure by means of a global failure criterion. Modeling and evaluation studies confirm the potential of fracture mechanics approach for analysis and design of FRP-RC and FRP-steel systems against debonding failures.
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Emergency braking using two independent steering actuators while maintaining directional control
"By-wire" systems are currently an area of significant interest in the automotive industry. In particular, there is substantial work being done to investigate the use of steer-by-wire and brake-by- wire systems in automobiles. Since these systems replace traditional mechanical connections with …
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Distributed Generation: Issues Concerning a Changing Power Grid Paradigm
… result in undesirable operating conditions, or system failure. This paper investigates the primary issues involved with the implementation of distributed generation and maintaining the integrity of the power grid. The issues addressed include power flow, system protections, voltage regulation, …
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