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 289 for “"Fault Detection"”.
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Fault detection of rolling element bearings
The early detection of bearing failure requires methods that are sensitive to impulsive signals and their changes. The difficulty of early bearing defect detection is that the signal component generated by early defect is very small compared to other vibration sources. It was found that techniques …
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Lazy Fault Detection for Redundant MPI
… to efficiently withstand hardware and software faults. Process replication is one resilience technique, but typical implementations require replicas to stay closely synchronized with each other. We propose algorithms to lazily detect faults in replicated MPI applications, allowing for more …
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Fault detection experiments in sequential machines.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1968. M.S.
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Power System Fault Detection Using Conductor Dynamics
Power system fault detection is conventionally achieved using current and potential measurements. An alternate and unconventional form of protective relaying is feasible using rigid bus conductor motion as the means of detection. The research presented focuses on the detection of power system …
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Investigation into fault detection and diagnosis techniques
The early detection and diagnosis of faults in systems is one of the most important tasks assigned to the computers supervising these systems. The early indication of abrupt or incipient failures can assist in avoiding major system breakdowns and catastrophes, which could otherwise result in …
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Non-intrusive fault detection in reciprocating compressors
… set of techniques for non-intrusive sensing and fault detection in reciprocating compressors driven by induction motors. The procedures developed here are "non-intrusive" because they rely only on electrical measurements to reconstruct the mechanical signals internal to the compressor. This …
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Observer-based fault detection for nuclear reactors
This is a study of fault detection for nuclear reactor systems. Basic concepts are derived from fundamental theories on system observers. Different types of fault- actuator fault, sensor fault, and system dynamics fault can be detected and localized by studying the asymptotic response of an error …
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Fault detection and location in modular trees
The problem of fault detection and location in modular tree structures are considered in this thesis. The fault set is restricted to stuck-at-faults in the discussion of the fault location problem. Short circuit faults and broken and short circuit faults are considered in the discussion of the …
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Transient fault detection using a watchdog processor
… but leave no permanent damage. These transient faults are difficult to predict, prevent, or detect but can lead to a system failure if not discovered.
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Fault detection and diagnosis : application in microelectromechanical systems
This thesis presents the development of a fault detection and diagnosis (FDD) procedure capable of capturing, isolating and identifying multiple abrupt parametric faults. The proposed method relies on parameter estimation deployed in a set membership framework. This approach presupposes the …
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System Identification And Fault Detection Of Complex Systems
… is devoted to devising system identification and fault detection approaches and algorithms for a system characterized by nonlinear dynamics. Mathematical models of dynamical systems and fault models are built based on observed data from systems. In particular, we will focus on statistical subspace …
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Fault Detection and Diagnosis for Large -Scale Systems
… industrial processes and their effectiveness for fault detection is well-recognized. There is an inherent limitation on the ability for data-driven techniques to identify and diagnose faults, especially when the abnormal situations are associated with unknown faults and multiple faults. To improve …
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A Logic Design Procedure to Facilitate Fault Detection
Made available in DSpace on 2014-12-10T19:06:48Z (GMT). No. of bitstreams: 1 7207058.pdf: 2686298 bytes, checksum: 40a98e38f4a6a2f6279a8b57ee0f82fc (MD5) Previous issue date: 1971
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Shipboard Fault Detection Methods for Condition-based Maintenance
… demonstrates vibration analysis for shipboard fault detection. Custom instrumentation and measurement techniques are applied to compressors, pumps, fans, and other shipboard electric machines.
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Fault detection, isolation, and recovery for autonomous parafoils
… transportation methods. The occurrence of a fault during a flight can severely degrade vehicle performance, effectively nullifying the value of the guided system, or worse. Quickly detecting and identifying faults enables the choice of an appropriate recovery strategy, potentially mitigating …
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FAULT DETECTION AND ISOLATION FOR WIND TURBINE DYNAMIC SYSTEMS
This work presents two fault detection and isolation (FDI) approaches for wind turbine systems (WTS). Firstly, a non-linear mathematical model for wind turbine (WT) dynamics is developed. Based on the developed WTS mathematical model, a robust fault detection observer is designed to estimate system …
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Integrated Proactive Multi-Fault Detection for Predictive Maintenance Applications
L'abstract è presente nell'allegato / the abstract is in the attachment
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High Impedance Arc Fault Detection in a Manhole Environment.
… was to develop a prototype high-impedance arc detection system that a utility worker could use as an early warning system while working in a manhole environment. As part of this system sensors and algorithms were developed to increase the sensitivity of detecting an arc while ignoring loads …
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