Synthesized Synchronous Sampling Technique for Bearing Damage Detection Preprint

摘要

Differential bearing between the low-pressure turbine (LPT) shaft and high-pressure turbine (HPT) shaft is one of the most vulnerable parts in a turbo machinery engine. Yet, it is one of the most difficult parts to detect the damage signatures, because the signal to noise ratio at the regular sensor locations is usually low. In addition, the speed variations in both the LPT and the HPT can further deteriorate the damage signature extracted by the conventional analysis. In this paper, we developed a 'synthesized synchronous sampling' technique to enhance the differential bearing damage signature. With this technique, together with the conventional acceleration enveloping technique, we are able to detect differential bearing damage at much earlier stage, thus provide early warning of the machinery health conditions.