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dc.contributor.advisorHoffman, A.J.
dc.contributor.authorVan der Merwe, Nicolaas Theodor
dc.date.accessioned2008-11-27T07:48:55Z
dc.date.available2008-11-27T07:48:55Z
dc.date.issued2003
dc.identifier.urihttp://hdl.handle.net/10394/68
dc.descriptionThesis (Ph.D. (Electronical Engineering))--North-West University, Potchefstroom Campus, 2004.
dc.description.abstractCondition monitoring of critical machinery has many economic benefits. The primary objective is to detect faults, for example on rolling element bearings, at an early stage to take corrective action prior to the catastrophic failure of a component. In this context, it is important to be able to discriminate between stable and deteriorating fault conditions. A number of conventional vibration analysis techniques exist by which certain faults in rotating machinery may be identified. However, under circumstances involving multiple fault conditions conventional condition monitoring techniques may fail, e.g. by indicating deteriorating fault conditions for stable fault situations or vice versa. Condition monitoring of rotating machinery that may have multiple, possibly simultaneous, fault conditions is investigated in this thesis. Different combinations of interacting fault conditions are studied both through experimental methods and simulated models. Novel signal processing techniques (such as cepstral analysis and equidistant Fourier transforms) and pattern recognition techniques (based on the nearest neighbour algorithm) are applied to vibration problems of this nature. A set of signal processing and pattern recognition techniques is developed for the detection of small incipient mechanical faults in the presence of noise and dynamic load (imbalance). In the case investigated the dynamic loading consisted of varying degrees of imbalance. It is demonstrated that the proposed techniques may be applied successfully to the detection of multiple fault conditions.
dc.publisherNorth-West University
dc.subjectCondition monitoringen
dc.subjectFault detectionen
dc.subjectRotating machineryen
dc.subjectRolling element bearingsen
dc.subjectArtificial intelligenceen
dc.subjectPattern recognitionen
dc.subjectNeural networksen
dc.subjectMultiple simultaneous fault conditionsen
dc.subjectStatic and dynamic loadingen
dc.subjectBearing and imbalance fault conditionsen
dc.titleThe application of signal processing and artificial intelligence techniques in the condition monitoring of rotating machineryen
dc.typeThesisen
dc.description.thesistypeDoctoral


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