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Fault indicator

About: Fault indicator is a research topic. Over the lifetime, 10057 publications have been published within this topic receiving 143482 citations. The topic is also known as: FCI & power line fault indicator.


Papers
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Dissertation
01 Jan 1995
TL;DR: This thesis proposes a new full-order unknown input observer structure for robust residual generation and this structure is then used to design directional and minimum variance residuals and studies the design of optimally robust parity relations using multi-criterion optimization.
Abstract: To guarantee safe operation and mission completion, any fault in an automatic system has to be diagnosed as early as possible. Model-based techniques have been widely recognized as feasible and powerful approaches for diagnosing faults and require a mathematical model of the monitored system. A prerequisite for successful model-based fault diagnosis is satisfactory robustness with respect to modelling uncertainties. This thesis examines and develops further the theory and application of robust residual generation techniques in model-based fault diagnosis, beginning with a study and review of basic principles of model-based fault diagnosis. A number of strategies for the design of robust residual generators are then proposed. The thesis proposes a new full-order unknown input observer structure for robust residual generation and this structure is then used to design directional and minimum variance residuals. This is followed by a very thorough presentation of the eigenstructure assignment approach to fault diagnosis. A new algorithm to assign right observer eigenvectors in disturbance de-coupling design is presented. The disturbance decoupling residual generation is then used for diagnosing faults in a jet engine system example. To facilitate this application, several techniques are proposed to derive an approximate disturbance distribution matrix. These techniques enlarge the application domain of disturbance de-coupling residual generation approaches. Robust residual generation can be treated as a multi-objective optimization problem in which fault sensitivity is to be maximized, whilst the sensitivity to modeffing uncertainties is to be minimized. The thesis defines a number of performance indices in observer-based residual generation and the multi-objective optimization is solved by a combination of the method of inequalities and genetic algorithms. Finally, the thesis studies the design of optimally robust parity relations using multi-criterion optimization. The techniques developed in this thesis are well illustrated using either academic or practical application examples and the results show the effectiveness of the developed techniques.

53 citations

Patent
19 Mar 1993
TL;DR: In this paper, a model-based alarm coordination system coordinates primary and secondary alarm notifications in order to ascertain whether they are caused by a single fault, or multiple faults, in a complex electrical system.
Abstract: A model-based alarm coordination system coordinates primary and secondary alarm notifications in order to ascertain whether they are caused by a single fault, or multiple faults, in a complex electrical system. The alarm coordination function is part of a larger overall Fault Management Support (FMS) system. The FMS system is a framework that, when combined with object-specific fault management parts, offers uniform fault management functions to managed objects (MOs) within the electrical system. Each MO is viewed as a self-contained, functional unit, and is responsible for its own internal fault management. Therefore, there are no global or centralized fault management functions. Object relation models, based on functional dependencies between objects, are used to automatically solve the alarm coordination problem which arises when a large number of faults are reported in response to a single fault which causes out-of-specification performance in many dependent objects. Little object-specific programming is required.

53 citations

Patent
18 Apr 2002
TL;DR: In this article, a computer server rack enclosure fault light diagnostic system and a method for providing an overall rack level fault indicator of a unit of electronic equipment housed in the rack are presented.
Abstract: A computer-server rack enclosure fault light diagnostic system and a method for providing an overall rack level fault indicator of a fault incurred by a unit of electronic equipment housed in the rack. The rack may be an EIA standard rack holding constituent components complying with EIA standards.

53 citations

Journal ArticleDOI
TL;DR: An advanced fault detection and isolation technique was developed for the steam generator system of a typical pressurized water reactor (PWR) plant and the implementation of the FDI algorithm for both instrument and actuator monitoring is demonstrated.

53 citations

Journal ArticleDOI
TL;DR: This paper presents multiple empirical experiments that investigate the impact of fault quantity and fault type on statistical, coverage-based fault localization techniques and fault-localization interference and suggests that fault- localization interference is prevalent and exerts a meaningful influence that may cause a fault’s localizability to vary greatly.
Abstract: This paper presents multiple empirical experiments that investigate the impact of fault quantity and fault type on statistical, coverage-based fault localization techniques and fault-localization interference. Fault-localization interference is a phenomenon revealed in earlier studies of coverage-based fault localization that causes faults to obstruct, or interfere, with other faults' ability to be localized. Previously, it had been asserted that a fault-localization technique's effectiveness was negatively correlated to the quantity of faults in the program. To investigate these beliefs, we conducted an experiment on six programs consisting of more than 72,000 multiple-fault versions. Our data suggests that the impact of multiple faults exerts a significant, but slight influence on fault-localization effectiveness. In addition, faults were categorized according to four existing fault-taxonomies and found no correlation between fault type and fault-localization interference. In general, even in the presence of many faults, at least one fault was found by fault localization with similar effectiveness. Additionally, our data exhibits that fault-localization interference is prevalent and exerts a meaningful influence that may cause a fault's localizability to vary greatly. Because almost all real-world software contains multiple faults, these results affect the practical use and understanding of statistical fault-localization techniques.

53 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202381
2022215
202127
202061
2019116
2018160