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 27 for “"Fault detection and isolation"”.
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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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Model-based fault detection and isolation techniques for wind turbines
… the work of this thesis is to design model-based fault detection and isolation techniques for a large-scale wind turbine. A mathematical model of the 5MW wind turbine was developed; the model was sufficiently detailed to be used for simulation purposes. The stages of the modelling procedure were …
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Fault detection and isolation in switched linear systems and applications
This thesis proposes a fault detection and isolation (FDI) method for switched linear systems. The method builds on a class of FDI filters for linear time-invariant (LTI) systems based on reduced-order observers. If certain conditions are satisfied, then it is possible to apply these filters to …
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Observer-based fault detection and isolation for motor drive inverters
Abstract Observer-based methods can be used for fault detection and isolation for switched linear systems. A state observer is constructed based on the physical system. Changes in the observer error are monitored to detect specific types of faults. This thesis uses the mathematical basis to offer a …
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INTELLIGENT FAULT DETECTION AND ISOLATION FOR PROTON EXCHANGE MEMBRANE FUEL CELL SYSTEMS
This work presents a new approach for detecting and isolating faults in nonlinear processes using independent neural network models. In this approach, an independent neural network is used to model the proton exchange membrane fuel cell nonlinear systems using a multi-input multi-output structure. …
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Algorithmic Optimization of Sensor Placement on Civil Structures for Fault Detection and Isolation
<p>Damage detection and isolation (DDI) is a task that can be divided into two major portions. Damage detection constitutes the first part of the problem, where the goal is to determine when a structural anomaly has occurred. Once an anomaly has been detected, algorithms must be employed to …
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Fault detection and isolation via continuous time statistics = Detección y Diagnóstico de fallos mediante estadísticos en tiempo continuo
… diferentes a partir de estadísticos diferentes, dando lugar así a distintos esquemas de detección y diagnóstico, que serán caracterizados desde el punto de vista de su conveniencia para la detección de distintos tipos de fallos. La regla de Bayes, de uso habitual en clasificación de patrones, es …
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Parameter Identification And Fault Detection For Reliable Control Of Permanent Magnet Motors
… objective of this dissertation is to develop new fault detection, identification, estimation and control algorithms that will be used to detect winding stator fault, identify the motor parameters and optimally control machine during faulty condition. Quality or proposed algorithms for Fault …
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Observer based fault detection filters for three-phase inverters and statcoms
… benefits in terms of size, weight, performance, and feasibility to various electrical systems. However, with increasing penetration of power electronics circuits in safety- and mission-critical systems, the reliability of the power electronics is becoming an issue of increasing concern. To …
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Estimation and fault diagnosis for vehicle energy systems
… by a desire to achieve reduced carbon emissions and maintenance costs, along with an increase in efficiency and performance, electrification has become a major trend in modern vehicles. This increase in electrification is accompanied by an increase in thermal power dissipated due to electrical …
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The importance of selecting the optimal number of principal components for fault detection using principal component analysis
Fault detection and isolation are the two fundamental building blocks of process monitoring. Accurate and efficient process monitoring increases plant availability and utilization. Principal component analysis is one of the statistical techniques that are used for fault detection. Determination of …
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Application of Dirichlet Distribution for Polytopic Model Estimation
… is often used in the areas of automatic control and fault detection and isolation (FDI). It is an alternative to the multiple model approach which explicitly allows for interpolation among local models. This thesis proposes a novel approach to PM estimation by modeling the set of PM weights as a …
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Spacecraft computing systems with high-level specifications and FPGAs
… custom software is specified, written, compiled, and executed by the microprocessors. The current process leads to a dedicated group of software engineers to design and create spacecraft software. This process is expensive and error-prone. Errors that occur during the translation of subsystem …
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Monitoring and Fault Diagnosis for Chylla-Haase Polymerization Reactor
… main objective of this research is to develop a fault detection and isolation (FDI) methodologies for Cylla-Haase polymerization reactor, and implement the developed methods to the nonlinear simulation model of the proposed reactor to evaluate the effectiveness of FDI methods. The first part of …
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Model-based fault detection and diagnosis of selective catalytic reduction systems for diesel engines
… sensors are required to be installed at upstream and downstream of the SCR. As a result, the reduction efficiency is also required to be monitored by the On-Board Diagnostics (OBD) regulations. Specifically, a diagnostic algorithm is required to detect and isolate the SCR system faults that may …
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Risk-resilient GPS-based positioning, navigation, and timing using sensor fusion and multi-agent platforms
… for many applications, such as positioning and navigation for ground and aerial vehicles, and timing and synchronization for the modern power systems. However, GPS receivers suffer from various vulnerabilities, including measurement faults, satellite faults, and spoofing attacks. Measurement …
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Unknown input observer approaches to robust fault diagnosis
… focuses on the development of the model-based fault detection and isolation /fault detection and diagnosis (FDI/FDD) techniques using the unknown input observer (UIO) methodology. Using the UI de-coupling philosophy to tackle the robustness issue, a set of novel fault estimation (FE)-oriented …
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Control and operation of offshore wind farms connected with diode rectifier HVDC systems
Due to the advantage of abundant space and more consistent wind speed, interest in offshore wind energy has significantly increased. To reduce the cost related to offshore wind power integration, this thesis investigates the control, modelling and operation of offshore wind farms connected with …
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Energy based visualisation of a Brayton cycle power conversion unit for the purpose of condition monitoring
… increased awareness of greenhouse gas emissions and dwindling natural resources. Condition monitoring is key to the efficient operation of a plant. Part of condition monitoring is fault detection and isolation (FDI). Various methods have been developed and implemented for the purpose of FDI in …
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