Backlash identification in transmission unit

This work presents a methodology identifying the increase of backlash amount in any type of gearboxes for a movable mechanical unit. No external sensor is required. A dedicated test cycle, of at least 4–8 seconds long, is run regularly on the axis under examination. The motion data, i.e. position, velocity and torque references is logged and stored in a file. The file is later on subject for automatic backlash analysis. The sampled data is analyzed and the so called backlash energy, invented in this work, is calculated and stored in a database. The stored data are trended and the criticality of the eventual backlash enlargement is established using a number of statistical methods for the unit under examination. The proposed method is verified in three different experiments on total 19 (13+5+1) different movable mechanical units and corresponding transmission units with very good results.

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