Table 6 Quantitative feature retention vs. Compression ratio.
From: Fault prediction of aircraft engine based on adaptive hybrid sampling and BiLSTM
CR | Time-Domain Similarity (Cross-Corr.) | Spectral Energy Retained (%) | Detectable Fault Types |
---|---|---|---|
0.1 | 0.92 | 95% | All (incl. micro-cracks < 0.2 ms) |
0.2 | 0.88 | 90% | Bearing spalls, gear tooth fractures |
0.3 | 0.81 | 83% | Macro-faults (> 1 ms duration) |
0.4 | 0.75 | 72% | Severe imbalances (low-frequency) |
0.5 | 0.68 | 60% | Only gross malfunctions |