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Mathematical Problems in Engineering
Volume 2014, Article ID 819438, 8 pages
Research Article

A New Feature Selection Algorithm Based on the Mean Impact Variance

1School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
2Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269, USA

Received 19 January 2014; Revised 1 May 2014; Accepted 9 June 2014; Published 26 June 2014

Academic Editor: Weihua Li

Copyright © 2014 Weidong Cheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The selection of fewer or more representative features from multidimensional features is important when the artificial neural network (ANN) algorithm is used as a classifier. In this paper, a new feature selection method called the mean impact variance (MIVAR) method is proposed to determine the feature that is more suitable for classification. Moreover, this method is constructed on the basis of the training process of the ANN algorithm. To verify the effectiveness of the proposed method, the MIVAR value is used to rank the multidimensional features of the bearing fault diagnosis. In detail, (1) 70-dimensional all waveform features are extracted from a rolling bearing vibration signal with four different operating states, (2) the corresponding MIVAR values of all 70-dimensional features are calculated to rank all features, (3) 14 groups of 10-dimensional features are separately generated according to the ranking results and the principal component analysis (PCA) algorithm and a back propagation (BP) network is constructed, and (4) the validity of the ranking result is proven by training this BP network with these seven groups of 10-dimensional features and by comparing the corresponding recognition rates. The results prove that the features with larger MIVAR value can lead to higher recognition rates.