Table 3 Sensitivity analysis results of key hyperparameters.
From: Fault diagnosis using ISMA to optimize SVM parameters for aircraft engine damage repair
Hyperparameters | Justification range | Optimum | Method of adjustment | Volatility of accuracy |
|---|---|---|---|---|
AE iterations | 500–2000 | 1000 | Systemic grid search (step size 200) | ± 1.2 |
BiGRU hidden layer dimension | 32–128 | 64 | Systemic grid search (step size 16) | ± 2.3 |
Size of ISMA population | 20–50 | 30 | Empirical validation (5 control experiments)) | ± 1.8 |
SVM penalty parameter C | 0.1–100 | 25.6 | ISMA automatic optimization | ± 0.9 |
Sampling rates | 22.05–48 kHz | 44.1 kHz | System grid search (step 11.025 kHz) | ± 1.5% |
Window size | 0.5–2 s | 1s | System grid search (step size 0.5s) | ± 1.7% |
