Further developments on gear transmission monitoring

This work shows how it is possible to improve the algorithm used for the duration test. Generally, it shows some frequencies in the spectrum of signal obtained by an accelerometer. Several considerations on frequencies appears when an unexpected event occurs are presented. In the first part of the paper it is described the typical frequencies due to the vibration of the gearbox. In the second part it is illustrated the concept of harmonics, side bands and their meaning. In the third part a new index for monitoring the duration test is introduced. This index, as explained below is very important, because it gives the opportunity of checking the various aspects of the spectrum of the signal of an accelerometer. A warning starts if a damage on a gear wheel is detected.