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dc.contributor.authorSaxena, Abhinaven_US
dc.date.accessioned2007-08-16T17:36:51Z
dc.date.available2007-08-16T17:36:51Z
dc.date.issued2007-07-06en_US
dc.identifier.urihttp://hdl.handle.net/1853/16125
dc.description.abstractA paradigm shift is emerging in system reliability and maintainability. The military and industrial sectors are moving away from the traditional breakdown and scheduled maintenance to adopt concepts referred to as Condition Based Maintenance (CBM) and Prognostic Health Management (PHM). In addition to signal processing and subsequent diagnostic and prognostic algorithms these new technologies involve storage of large volumes of both quantitative and qualitative information to carry out maintenance tasks effectively. This not only requires research and development in advanced technologies but also the means to store, organize and access this knowledge in a timely and efficient fashion. Knowledge-based expert systems have been shown to possess capabilities to manage vast amounts of knowledge, but an intelligent systems approach calls for attributes like learning and adaptation in building autonomous decision support systems. This research presents an integrated knowledge-based approach to diagnostic reasoning for CBM of engineering systems. A two level diagnosis scheme has been conceptualized in which first a fault is hypothesized using the observational symptoms from the system and then a more specific diagnostic test is carried out using only the relevant sensor measurements to confirm the hypothesis. Utilizing the qualitative (textual) information obtained from these systems in combination with quantitative (sensory) information reduces the computational burden by carrying out a more informed testing. An Industrial Language Processing (ILP) technique has been developed for processing textual information from industrial systems. Compared to other automated methods that are computationally expensive, this technique manipulates standardized language messages by taking advantage of their semi-structured nature and domain limited vocabulary in a tractable manner. A Dynamic Case-based reasoning (DCBR) framework provides a hybrid platform for diagnostic reasoning and an integration mechanism for the operational infrastructure of an autonomous Decision Support System (DSS) for CBM. This integration involves data gathering, information extraction procedures, and real-time reasoning frameworks to facilitate the strategies and maintenance of critical systems. As a step further towards autonomy, DCBR builds on a self-evolving knowledgebase that learns from its performance feedback and reorganizes itself to deal with non-stationary environments. A unique Human-in-the-Loop Learning (HITLL) approach has been adopted to incorporate human feedback in the traditional Reinforcement Learning (RL) algorithm.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectHuman in the loop learningen_US
dc.subjectDynamic case-based reasoningen_US
dc.subjectIndustrial language processingen_US
dc.subjectEvolving knowledgebaseen_US
dc.subjectCondition based maintenanceen_US
dc.subjectKnowledge managementen_US
dc.subject.lcshSystem failures (Engineering)en_US
dc.subject.lcshAutomatic test equipmenten_US
dc.subject.lcshDecision support systemsen_US
dc.subject.lcshMachinery Maintenance and repairen_US
dc.titleKnowledge-Based Architecture for Integrated Condition Based Maintenance of Engineering Systemsen_US
dc.typeDissertationen_US
dc.description.degreePh.D.en_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.advisorCommittee Chair: Vachtsevanos, George; Committee Member: Egerstedt, Magnus; Committee Member: Ferri, Aldo A.; Committee Member: Howard, Ayanna; Committee Member: Saad, Ashrafen_US


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