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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 832192, 22 pages
http://dx.doi.org/10.1155/2014/832192
Research Article

Fault Feature Analysis of a Cracked Gear Coupled Rotor System

School of Mechanical Engineering and Automation, Northeastern University, Shenyang, Liaoning 110819, China

Received 19 March 2014; Accepted 22 May 2014; Published 24 June 2014

Academic Editor: Minping Jia

Copyright © 2014 Hui Ma 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.

Abstract

Considering the misalignment of gear root circle and base circle and accurate transition curve, an improved mesh stiffness model for healthy gear is proposed, and it is validated by comparison with the finite element method. On the basis of the improved method, a mesh stiffness model for a cracked gear pair is built. Then a finite element model of a cracked gear coupled rotor system in a one-stage reduction gear box is established. The effects of crack depth, width, initial position, and crack propagation direction on gear mesh stiffness, fault features in time domain and frequency domain, and statistical indicators are investigated. Moreover, fault features are also validated by experiment. The results show that the improved mesh stiffness model is more accurate than the traditional mesh stiffness model. When the tooth root crack appears, distinct impulses are found in time domain vibration responses, and sidebands appear in frequency domain. Amplitudes of all the statistical indicators ascend gradually with the growth of crack depth and width, decrease with the increasing crack initial position angle, and firstly increase and then decrease with the growth of propagation direction angle.