3Koretskii A V, Martynenko Y G. Determination of Probability Characteristics of Perturbing Moments in Gyroscopes with an Electrostatic Suspension [ J ]. Mekhanika Tverdogo Tela, 1983 (3) :4 - 11.
5Park N O, Sin Y C, An S P, et al. A Study on the Classification of Arcing Faults in Power Systems Using Phase Plane Trajectory Method [ J ]. The Transactions of the Korean Institute of Electrical Engineers: A, 2002, 51 (5) :209 -216.
6The Case Western Reserve University Bearing Data Center Website. Bearing Data Center Seeded Fault Test Data[ EB/OL ]. [ 2007 - 11 - 27 ]. http ://www. eecs/ cwru/edu/laboratory/bearing/.
