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| Dynamic characteristics of a gear system with crack fault and its fault feature analysis |
| WANG Xu1, WU Xing1, XIAO Zhengming1, CAO Yongli2, LIU Tao1 |
1.Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China;
2.Kunming Yunnei Power Co.,Ltd.,Kunming 650500,China |
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Abstract A multi-DOF mechanical model of a gear system with crack fault was established to study its failure mechanism based on the dynamic method,considering effects of time-varying mesh stiffness,transmission error and bearing support stiffness.First of all,meshing stiffnesses of gears in two cases including normal condition and the one with crack fault were calculated for the accurate dynamic characteristics analysis.The results of the system’s dynamic responses solved with the built dynamical model showed that there are some periodic impulses in time domain waveform,and there are some side frequencies equally spaced near the mesh fundamental frequency and its harmonic components,the interval between two side-frequencies is equal to the rotating frequency of the faulty gear; the amplitudes of side frequencies are lower and their energy is dispersive and not uniform,these amplitudes within different frequency bands are different.Aiming at the above mentioned features,the signal frequency band was decomposed with the orthogonal wavelet packet method and each sub-frequency band signal was analyzed using the cepstrum analysis method.The results showed that the proposed method can effectively improve the signal-to-noise ratio of signals,and make it easier to identify and extract side frequency components caused due to crack fault in signals to be detected.
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Received: 18 November 2015
Published: 25 April 2017
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