Fault Diagnosis Method of Machinery Based on Fisher’s Linear Discriminant and Possibility Theory
This paper proposes a new condition diagnosis method for plant machinery using Fisher’s linear discriminant and possibility theory. The non-dimensional symptom parameters (NSPs) are defined to reflect the features of the vibration signals measured in each state. Fisher’s linear discriminant is used to project the multiple SPs from a high dimensional space to a low dimensional space for distinguishing states, and discriminant rules are set by possibility theory. Moreover, sequential diagnosis is also proposed by which the conditions of the machinery can be identified sequentially. Sensitive evaluation method for selecting good symptom parameters using Distinction Index (DI) is also suggested for detecting faults in rotating machinery. Finally, practical examples of the diagnosis for rotating machine are shown to verify the efficiency of the method.
KeywordsFault diagnosis Rotating machinery Fisher’s linear discriminant Possibility theory Sequential method
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