|Table of Contents|

Fault feature identification of turbopump bearings based on EMD-Hilbert envelope spectrum analysis(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2023年05期
Page:
59-65
Research Field:
目次
Publishing date:

Info

Title:
Fault feature identification of turbopump bearings based on EMD-Hilbert envelope spectrum analysis
Author(s):
ZANG Dongqing;  QIN Lei;  HE Weifeng;  ZHANG Dong;  LIU Xin;  LIU Ruixin
(Beijing Aerospace Propulsion Institute, Beijing 100076, China)
Keywords:
rocket engine;  turbopump bearings;  fault feature extraction;  EMD;  Hilbert envelope demodulation
PACS:
V434.3
DOI:
-
Abstract:
In the low temperature and high speed bearing test of the rocket engine turbopump, the reliability of the bearing is very important to ensure the success of the test. Aiming at the problem that the early fault features of turbopump high-speed bearings are difficult to extract from the original signal, based on the EMD-Hilbert envelope demodulation analysis method, the early fault features of turbopump high-speed bearings are identified. The original signal is adaptively decomposed by the EMD method to obtain several IMF components, and the IMF components are screened based on the principle of maximum correlation index to reconstruct the signal. The Hilbert envelope demodulation analysis is performed on the reconstructed signal to extract the early features of the faulty bearing. The validity of the method is verified by the real fault data of a certain type of turbopump at low-temperature and high-speed bearing test, and the vibration acceleration data of the cage failure in the test device during the whole process of stepped acceleration are recorded. The analysis results show that the EMD-Hilbert envelope demodulation analysis method can improve the signal-to-noise ratio, retain the periodic impact component of the cage fault information to maximum extent, and effectively extract the cage fault frequency, fault frequency double and various modulation frequency components, so as to achieve the effective identification of early faults of turbopump high-speed bearings. In order to deeply analyze the fault of bearing cage, combined with the 11 operating states of the engine system, an analytical method of the whole process of progressive deterioration of bearing is proposed in this paper, and the specific moment of early human intervention of bearing failure is determined.

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