Abstract：Planet gearbox is a crucial component of a wind turbine device, faults are easily caused during it working under complex circumstances, such as, low velocity and heavy load, simultaneous spin and revolution. Its fault diagnosis, especial, faulted planet gear positioning is always focal and difficult to study. Here, the test devices for a planetary gearbox were built to analog planet gear faults, the faulted planet gear positioning was performed with acoustic emission (AE) signals. Firstly, propagation characteristics of acoustic emission signals within and between gears were investigated, the fault positioning model was simplified with the amplitude attenuation characteristics of AE signals. Secondly, equations for fault souce positioning was established based on the exponential decay relation between signal amplitude and its propagation distance to obtain the mesh position of faulted teeth. Furthermore, the position of a faulted planted gear was determined. The test results showed that the location of a faulted planet gear can be accurately determined with the amplitude attenuation characteristics of AE signals.
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