A local energy density methodology for monitoring the evolution of gear faults

摘要

A new method for monitoring the evolution of gear faults based on the calculation of local energy density is presented. A theoretical model for a gear pair with a tooth root crack was developed. Experimental results from a test rig were analyzed using the continuous wavelet transform and the energy density of the vibration signal associated with the meshing of defected gears was calculated. It was shown that the local energy is a sensitive feature for assessing the fault magnitude. An empirical law, which relates the energy content to the depth of the crack, was established.