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Proceedings Paper

Classifier performance measures in multifault diagnosis for aircraft engines
Author(s): Weizhong Yan; Kai Goebel; James C.M. Li
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Paper Abstract

Classifier performance evaluation is an important step in designing diagnostic systems. The purposes of performing classifier performance evaluation include: 1) to select the best classifiers from the several candidate classifiers, 2) to verify that the classifier designed meets the design requirement, and 3) to identify the need for improvements in the classifier components. In order to effectively evaluate classifier performance, a classifier performance measure needs to be defined that can be used to measure the goodness of the classifiers considered. This paper first argues that in fault diagnostic system design, commonly used performance measures, such as accuracy and ROC analysis are not always appropriate for performance evaluation. The paper then proposes using misclassification cost as a general performance measure that is suitable for binary as well as multi-class classifiers, and -most importantly- for classifiers with unequal cost consequence of the classes. The paper also provides strategies for estimating the cost matrix by taking advantage of fault criticality information obtained from FMECA. By evaluating the performance of different classifiers considered during the design process of an engine fault diagnostic system, this paper demonstrates that misclassification cost is an effective performance measure for evaluating the performance of multi-class classifiers with unequal cost consequence for different classes.

Paper Details

Date Published: 16 July 2002
PDF: 10 pages
Proc. SPIE 4733, Component and Systems Diagnostics, Prognostics, and Health Management II, (16 July 2002); doi: 10.1117/12.475498
Show Author Affiliations
Weizhong Yan, GE Global Research Ctr. (United States)
Kai Goebel, GE Global Research Ctr. (United States)
James C.M. Li, Rensselaer Polytechnic Institute (United States)

Published in SPIE Proceedings Vol. 4733:
Component and Systems Diagnostics, Prognostics, and Health Management II
Peter K. Willett; Thiagalingam Kirubarajan, Editor(s)

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