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According to the characteristic of centrifugal compressor fault, the case representation method was proposed. The heterogeneous attribute set structure was designed in detail. The length of attribute set was not fixed for different cases. The attribute weight of each case was calculated by three-scale Analytic Hierarchy Process (AHP). Then the improved nearest neighbor algorithm was proposed to calculate the similarity degree of cases, by which, cases were matched accurately based on attribute name, attribute value and weight and the structure similarity of attribute set of cases was measured. The resolution of similarity degree was high and the shortcomings of traditional nearest neighbor algorithm that fail to compute the similarity of heterogeneous cases were overcome.
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