High gear mesh (number of teeth times running speed)
It is common to witness a peak at the gear mesh frequency. However, if the amplitude of the peak increases, or harmonics develop, or the side bands of the input or output speed grow in amplitude, then it is highly likely that a fault is developing in the gearbox.
It is up to you what to do next. If you carefully analyze the spectrum and analyze a time waveform (that has been measured correctly) it is possible to pinpoint the fault condition.
These frequencies will be most prominent in the radial direction for spur gears, and in the axial direction for helical gears
Gear mesh = Number of teeth x Shaft speed
Output speed = Input speed x Input teeth/Output teeth
Spectrum: Your Fmax should be set to equal or exceed approximately 3.3 times the gearmesh frequency in order to view up to 3xGMF its sidebands. However you also need enough resolution to be able to clearly see the sidebands.
Time waveform: TWA is your best tool for detecting and diagnosing gearbox faults. You need to ensure, however, that you can see a sufficient number of gear rotations, and have the resolution to see each individual tooth mesh.
Wear particle analysis: WPA is an excellent tool for the early detection of many gear faults.
High gear mesh (number of teeth times running speed)
It is common to witness a peak at the gear mesh frequency. However, if the amplitude of the peak increases, or harmonics develop, or the side bands of the input or output speed grow in amplitude, then it is highly likely that a fault is developing in the gearbox.
It is up to you what to do next. If you carefully analyze the spectrum and analyze a time waveform (that has been measured correctly) it is possible to pinpoint the fault condition.
These frequencies will be most prominent in the radial direction for spur gears, and in the axial direction for helical gears
Gear mesh = Number of teeth x Shaft speed
Output speed = Input speed x Input teeth/Output teeth
Spectrum: Your Fmax should be set to equal or exceed approximately 3.3 times the gearmesh frequency in order to view up to 3xGMF its sidebands. However you also need enough resolution to be able to clearly see the sidebands.
Time waveform: TWA is your best tool for detecting and diagnosing gearbox faults. You need to ensure, however, that you can see a sufficient number of gear rotations, and have the resolution to see each individual tooth mesh.
Wear particle analysis: WPA is an excellent tool for the early detection of many gear faults.
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