Abstract
Conventional time-frequency analysis (TFA) methods have played an important role in characterizing the TF pattern of nonstationary signals. In this paper, a new TFA algorithm, called matching demodulation transform (MDT), is introduced to extract the highly oscillatory frequency modulation (FM) feature of rotor rub-impact fault. When a rub-impact fault occurs in the rotor system, vibration signals will present the FM feature because of the periodic rub-impact between the stator and the rotor. Through a partial demodulation and stepwise refinement procedure, the highly oscillatory FM feature is represented with satisfactory energy concentration in the time-frequency plane. The validity and practical utility of the MDT is then demonstrated on an experimental rotor system and a practical heavy oil catalytic cracking machine set with a rotor rub-impact fault. The analysis results show that the MDT is powerful in the analysis of FM signals and is an effective tool for the feature extraction of rub-impact faults.
| Original language | English |
|---|---|
| Article number | 6646286 |
| Pages (from-to) | 1372-1383 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Instrumentation and Measurement |
| Volume | 63 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2014 |
Keywords
- Feature extraction
- instantaneous frequency
- matching demodulation transform
- rotor fault diagnosis
- time-frequency analysis