This paper presents the comparison of three methodologies to detect if some fans in a matrix are not working properly. These\nmethodologies are based on detecting fan failures by analysing acoustic images of the fan matrix, obtained using a planar array of\nMEMS microphones. Geometrical parameters of these acoustic images for different frequencies are then used to train a support\nvector machine (SVM) classifier, in order to detect the fan failures. One of the methodologies is based on the detection of the faulty\nfan in the matrix, under the hypothesis that only one fan can fail. Other methodology is based on the detection of the specific\nworking situation of the matrix. And finally, the third methodology that is compared is based on determining individually if each\nof the fans of the matrix is working properly or not. The comparison shows that this third methodology is the most reliable.
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