Detection of gearbox rattle noise in run-up conditions
Résumé
This work proposes an original approach to detect rattle noise in car gearboxes. Rattle noise is produced by vibro impacts between teeth of unloaded gears. These impacts are principally caused by the engine acyclism transmitted to the primary shaft of the gearbox after being partially filtered by the clutch. The appearance and the level of rattle noise depend, among others, on the operating conditions and more particularly on the rotation speed. The interest is then here focused on tests in run up conditions in order to scan a large panel of operating conditions. The objective of this work is to develop an efficient method to detect rattle noise in signals based on an angle-time cyclostationary approach. The results are compared to a more intrusive detection methodology exploiting signals issued from optical encoders.