In order to cope with constraints of the industrial world, the early detection of faults has now become essential. In that context vibration analysis has proven to be an effective tool, on the condition to be well utilized. DYNAE, a French leading company in that field, has developed a new Gear toolbox in its DynamX home software, which is dedicated to the diagnosis of gearbox systems. Based on the knowledge of kinematical data, the toolbox automatically performs a series of processing in order to detect and assess the severity of gear faults. A first tool performs the computation of the averaged gear profiles (without the need of a tachometer measurement) which are useful for the diagnosis of faults inducing modulations of the meshing efforts (geometrical faults, eccentricity...). A second tool allows the detection of impulsive phenomena such as shocks that may be generated by tooth faults at an early stage (wear, pitting), and displays the results on polar representations. The analysis of the motor electrical current may also be useful, especially in low speed applications, as known to be suited to the detection of torsional effects, which may be induced by faults such as cracked teeth. These techniques are illustrated on examples taken from the industry.
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