Machine vibration signal has been used in fault detection and diagnosis. Modulation and non-stationary existing in the signal generated by a faulty gearbox presents challenges to effective fault detection. In order to study the phenomenon of gear wearing, the vibration of a gearbox in a transmission shaft is measured by the order tracking method. Order tracking has the ability to detect the fault issue of gear wearing. Measured results indicate characteristic parameters of gear wearing. And compared with the tradition spectral analysis, the advantages of order tracking were presented in the paper. These measured data and analyzed results were the important guidance in the dynamic design, modification and operation management of transmission box.

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