Open Access
Review
Table 1
Summary of commonly used feature types in pump fault diagnosis.
| Feature category | Representative features |
|---|---|
| Time-domain features | RMS, kurtosis, crest factor, skewness, peak-to-peak value [13, 14]. |
| Frequency-domain features | FFT spectral energy, characteristic frequency amplitude, harmonic ratios [9, 11]. |
| Time–frequency features | Wavelet packet energy, STFT coefficients, Hilbert spectrum [15]. |
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