Local meshing plane as a source of diagnostic information for monitoring the evolution of gear faults
In the paper a new method of assessment gear failures evolution is proposed. The method is based on the on calculation of instantaneous energy density of the vibroacoustic signal’s envelope for the consecutive meshes and allows for acquiring information about the meshes quality and the disturbances of the meshing process for particular teeth pairs. For this purpose a meshing local plane “pinion tooth – gear tooth” concept is proposed permitting the observation of the energy density changes for the consecutive teeth (or teeth pairs) during the normal exploitation of the gearbox. The meshing local plane allows finding in the signal the local disturbances caused by meshing errors or developing fatigue related failures like pitting or gear cracks and link them to the meshes of particular teeth pairs. In the paper the theoretical background of the method as well as the possibilities of different ways of signal analysis would be presented along with the experimental results taken on the back-toback test stand during the fatigue test. The method is relatively easy for implementation in an online monitoring diagnostic system as it is not based on spectral analysis nor requires synchronous averaging of the signal. It could be used for assessing the manufacturing quality of gears, the assembly quality as well as for the gear failure evaluation during normal exploitation.
KeywordsData Block Gear Tooth Local Plane Helical Gear Tooth Pair
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