Using Wavelet Scalogram Method to Analyze Cracked Rotor System with Fractional Order Damping

doi:10.3969/j.issn.1000-1093.2014.08.022

Abstract

Abstract: A fault diagnosis method of cracked rotor system with fractional order damping based on wavelet scalogram is proposed through the model of cracked rotor system based on the fractional calculus and wavelet scalogram. The characteristics of wavelet scalogram and reassigned scalogram from different crack depth in rotor system with fractional order damping are discussed. The simulation results show that the derivative order of damping and the crack depth have great influence to the dynamics characteristics of rotor system. The optimal derivative order of damping can be determined by adjusting the fractional order. The proposed method is sensitive to crack fault, which can effectively extract the crack fault information in the rotor system. Finally, the effectiveness of the proposed method is verified through the experiment rig. The experimental results are very consistent with the simulation results, and the proposed model of cracked rotor system based on the fractional calculus is correct.

Key words: power machinery engineering, wavelet scalogram, fractional calculus, cracked rotor, fault diagnosis

CLC Number:

TH165.3

LI Zhi-nong, WANG Hai-feng, HE Xu-ping, XIAO Yao-xian. Using Wavelet Scalogram Method to Analyze Cracked Rotor System with Fractional Order Damping[J]. Acta Armamentarii, 2014, 35(8): 1281-1287.

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