Local Fault Detection of Intershaft Bearing in Aircraft Engines

DOI

10.2991/lemcs-14.2014.230How to use a DOI?

Keywords

aircraft engine; intershaft bearing; fault detection; rotation speed difference domain envelope spectrum; constant frequencies; constant distances

Abstract

Rotation speed difference domain (RSDD) frequency spectrum and RSDD envelop spectrum are presented for sake of detecting intershaft bearing with local defect. The methods are used to analyze vibration signal measured from intershaft bearing test rig. Results of the theoretical analysis show that, positions of unbalance response, misalignment response, and bearings with a stationary outer race on RSDD frequency spectrum and envelop spectrum vary with rotation speeds. As for intershaft bearing in RSDD, distances between adjacent side frequencies in frequency spectrum and positions of characteristic defect multiple frequencies in envelop spectrum keep constant under variational rotation speeds of outer race and inner race, which are called characteristic “constant distances” and “constant frequencies”. The experiment of intershaft bearing with local fatigue peeling on its outer raceway indicates that the theory is verified and useful in diagnosing faults of intershaft bearing.

Copyright

© 2014, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Zhenguo Ma
AU  - Mingfu Liao
PY  - 2014/05
DA  - 2014/05
TI  - Local Fault Detection of Intershaft Bearing in Aircraft Engines
BT  - Proceedings of the International Conference on Logistics, Engineering, Management and Computer Science
PB  - Atlantis Press
SP  - 1026
EP  - 1031
SN  - 1951-6851
UR  - https://doi.org/10.2991/lemcs-14.2014.230
DO  - 10.2991/lemcs-14.2014.230
ID  - Ma2014/05
ER  -